Parts Sheet - You are now at the Down-Load Site for Tol-O - Tolomatic

B3S20, M3S20 Screw-Drive Actuators Wedge Style 

50mm (2 inch) Bore 

1 

29 

28 

27 

26 

25 

21 

2 

39 

List of Parts 

22 

31 

30 

23 

3 4 5 

24 

32 

6 

33 

7 

34 

8 

35 

9 

B3S20 

36 

37 

Parts Sheet 

3600-4130_11_B3S20 

replaced 3600-4043 

19 

38 

20 

17 40 

NOTE: Pages 4 & 5 show 

parts for units manufactured 

13 

15 before 12-01-2004 

10 11 14 

NOTE: Items shaded cannot be field installed 

12 

without proper assembly fixtures. For repair, 

return cylinder to Tolomatic 

M3S20 

B3S20SN01 

B3S20SN02 

B3S20SNA02 

B3S20BN02 

B3S20BN05 

B3S20BNL05 

M3S20SN25 

M3S20SN12 

M3S20BN05 

M3S20BNL05 

PART NO. or 

ITEM config. code DESCRIPTION 

1 1,2 NDBB(M)3S20 

Replacement Dust Band 

(3420-1239) Specify Stroke 

A/R A/R A/R A/R A/R A/R A/R AR A/R A/R 

2 0603-1658 Spherical Nut 1 1 1 1 1 1 1 1 1 1 

3 1132-1014 Spherical Washer 1 1 1 1 1 1 1 1 1 1 

4 2100-1010 Retaining Ring 2 2 2 2 2 2 2 2 2 2 

5 

1309-2020 SHCS 8 8 8 8 8 8 – – – – 

4925-1033 SHCS – – – – – – 8 8 8 8 

6 

3420-1200 Actuator Head 2 2 2 2 2 2 – – – – 

4420-1200 Actuator Head – – – – – – 2 2 2 2 

3420-1208 Spacer – – – – 1 1 – – – – 

7 

3420-1209 Spacer 1 1 – – – – 1 1 – – 

3420-1210 Spacer 1 1 1 1 1 1 1 1 1 1 

4420-1210 Spacer – – – – – – – – 1 1 

8 2332-1006 Bumper 2 2 2 2 2 2 2 2 2 2 

3420-2124 Lead Screw, 1TPI, ACME, Std ST – – – – – – – – – 

3420-2125 Lead Screw, 1TPI, ACME, Ext OP – – – – – – – – – 

3420-2126 Lead Screw, 2TPI, ACME, Std – ST ST – – – – – – – 

9 1,4 3420-2127 Lead Screw, 2TPI, ACME, Ext – OP OP – – – – – – – 

3420-2128 Lead Screw, 2TPI, Ball, Std – – – ST – – – – – – 

3420-2129 Lead Screw, 2TPI, Ball, Ext – – – OP – – – – – – 

3420-2130 Lead Screw, 5TPI, Ball, Std – – – – ST ST – – – – 

1 

Specify stroke length when ordering 

2 

Available in Repair Kit No. 3420-9049 

3 

Also included in nut bracket assembly (Item 10) 

A/R = As Required 

ST = Standard Configuration (Used with LMI, in-line motor mount) 

OP = Optional Configuration (Used with RP, reverse parallel motor mount) 

4 

Configurated code is the preferred ordering method: RLS _3S20 ____ SK_____ MR____ 

Example: RLS B3S20 SN01 SK21.25 MRV231 

Replacement Lead Screw 

Model & Size Nut Style & Size Stroke Length Motor Code 

Tolomatic • URL: http://www.tolomatic.com • Email: help@tolomatic.com • Fax: (763) 478-8080 • Toll Free: 1-800-328-2174 

ITEM 

PART NO. or 

config. code DESCRIPTION 

18 

B3S20 

M3S20 

B3S20SN01 

B3S20SN02 

B3S20SNA02 

B3S20BN02 

B3S20BN05 

B3S20BNL05 

M3S20SN25 

M3S20SN12 

M3S20BN05 

M3S20BNL05 

9 1,4 4420-1205 Lead Screw, 25mm Lead, V, Std – – – – – – ST – – – 

3420-2131 Lead Screw, 5TPI, Ball, Ext – – – – OP OP – – – – 

4420-1206 Lead Scw, 12mm Lead, ACME, Std – – – – – – – ST – – 

4420-1254 Lead Scw, 12mm Lead, ACME, Ext – – – – – – – OP – – 

4420-1253 Lead Screw, 25mm Lead, V, Ext – – – – – – OP – – – 

4420-1207 Lead Screw, 5mm Lead, Ball – – – – – – – – ST ST 

4420-1255 Lead Screw, 5mm Lead, Ball – – – – – – – – OP OP 

10 

3420-9062 Nut Bracket Assy, 1 TPI 1 – – – – – – – – – 

3420-9063 Nut Bracket Assy, 2TPI – 1 – – – – – – – – 

3420-9064 Nut Bracket Assy, BN, 2TPI – – – 1 – – – – – – 

3420-9065 Nut Bracket Assy, BN, 5TPI – – – – 1 1 – – – – 

3420-9066 Nut Bracket Assy, AB, 2TPI – – 1 – – – – – – – 

4420-9027 Nut Bracket (Metric), 12mm – – – – – – – 1 – – 

4420-9028 Nut Bracket (Metric), 25mm – – – – – – 1 – – – 

4420-9029 Nut Bracket (Metric), 5mm – – – – – – – – 1 1

2 – Instructions B3S20, M3S20 Parts Sheet #3600-4130_11_B3S20ps 

1 

29 

28 

27 

26 

25 

21 

39 

22 

31 

30 

23 

24 

32 

6 

34 

33 

8 

7 

35 

9 

36 

37 

19 

38 

20 

17 40 

NOTE: Pages 4 & 5 show 

parts for units manufactured 

13 

15 before 12-01-2004 

10 11 14 


12 



18 

2 

3 4 5 

B3S20 

M3S20 

B3S20 

M3S20 

PART NO. or 


B3S20SN01 

B3S20SN02 

B3S20SNA02 

B3S20BN02 

B3S20BN05 

B3S20BNL05 

M3S20SN25 

M3S20SN12 

M3S20BN05 

M3S20BNL05 

3420-1013 Nut 4 4 4 4 4 4 – – – – 

11 

4420-1013 Nut – – – – – – 4 4 4 4 

12 3420-1241 Rail Way 2 2 2 2 2 2 2 2 2 2 

13 3 2406-1008 Magnet 2 2 2 2 2 2 2 2 2 2 

14 

3420-1508 Machined Tube 1 1 1 1 1 1 – – – – 

4420-1501 Machined Tube – – – – – – 1 1 1 1 

15 1 NMBB(M)3S20 

Replacement Band Magnet 

(3420-1240) Specify Stroke A/R 2 

A/R 2 

A/R 2 

A/R 2 

A/R 2 

A/R 2 

A/R 2 

A/R 2 

A/R 2 

A/R 

2 

16 This Number is Not Used 

17 3420-1222 Contact Bearing 2 2 2 2 2 2 2 2 2 2 

18 

3420-9054 Head End Kit 1 1 1 1 1 1 – – – – 

4420-9054 Head End Kit – – – – – – 1 1 1 1 

19 3420-1496 Machined Wedge 1 1 1 1 1 1 1 1 1 1 

20 0605-1045 Socket Head Cap Screw A/R A/R A/R A/R A/R A/R A/R AR A/R A/R 

21 3420-1024 Carrier Way 2 2 2 2 2 2 2 2 2 2 

22 

3420-1219 Upper Clamp 2 2 2 2 2 2 – – – – 

4420-1219 Upper Clamp – – – – – – 2 2 2 2 

23 

3415-1455 Set Screw 4 4 4 4 4 4 – – – – 

4410-1017 Set Screw – – – – – – 4 4 4 4 

24 3420-1069 PLT Ball Return 2 2 2 2 2 2 2 2 2 2 

25 3415-1047 Upper Band Ramp 2 2 2 2 2 2 2 2 2 2 

1085-1075 Socket Head Cap Screw 2 2 2 2 2 2 – – – – 

26 

0610-1033 Socket Head Cap Screw – – – – – – 2 2 2 2 

27 3420-1014 Ball Return 2 2 2 2 2 2 2 2 2 2 

PART NO. or 


B3S20SN01 

B3S20SN02 

B3S20SNA02 

B3S20BN02 

B3S20BN05 

B3S20BNL05 

M3S20SN25 

M3S20SN12 

M3S20BN05 

M3S20BNL05 

28 3420-1015 Right Ball Race 2 2 2 2 2 2 2 2 2 2 

29 3420-1032 Left Ball Race 2 2 2 2 2 2 2 2 2 2 

30 2 3420-1025 Wiper 2 2 2 2 2 2 2 2 2 2 

31 

3420-2021 Machined Carrier 1 1 1 1 1 1 – – – – 

4420-1235 Machined Carrier – – – – – – 1 1 1 1 

3420-1223 Flathead Cap Screw 3 3 3 3 3 3 – – – – 

32 

4420-1011 

Flathead Head Cap 

Screw 

– – – – – – 3 3 3 3 

33 3420-1009 Ball 92 92 92 92 92 92 92 92 92 92 

34 3420-1019 Ball Return Tube 2 2 2 2 2 2 2 2 2 2 

35 2 3420-2022 Carrier Cover 1 1 1 1 1 1 1 1 1 1 

36 2 3420-2024 End Cap 2 2 2 2 2 2 2 2 2 2 

1 

Specify stroke length when ordering 

2 

Available in Repair Kit No. 3420-9049 

3 

Also included in nut bracket assembly (Item 10) 

A/R = As Required 

ST = Standard Configuration (Used with LMI, in-line motor mount) 

OP = Optional Configuration (Used with RP, reverse parallel motor mount) 

4 

Configurated code is the preferred ordering method: RLS _3S20 ____ SK_____ MR____ 

Example: RLS B3S20 SN01 SK21.25 MRV231 

Replacement Lead Screw 

Model & Size Nut Style & Size Stroke Length Motor Code 

Tolomatic • URL: http://www.tolomatic.com • Email: help@tolomatic.com • Fax: (763) 478-8080 • Toll Free: 1-800-328-2174 

37 

38 

0605-1046 Socket Head Cap Screw 4 4 4 4 4 4 – – – – 


1820-1001 SCS, BTN 4 4 4 4 4 4 

4410-1719 SCS, BTN 4 4 4 4 

39 3420-2041 Sleeve 1 1 1 1 1 1 1 1 1 1 

40 2410-1157 Nut 1 1 1 1 1 1 1 1 1 1

Parts Sheet #3600-4130_11_B3S20ps B3S20, M3S20 Options – 3 

Main Unit Disassembly Instructions: 

1. Remove Motor Hardware and Dust Band. 

Remove any motor, reverse parallel, or gearhead hardware 

from the drive end of actuator. Loosen band clamp 

fasteners(23) and remove band both band clamps(22). 

Remove the carrier end cap fasteners(37) and end caps(36) 

from the carrier(30). Slide out the carrier cover(35) and remove 

the dust band(1). 

2. Remove the Non-Drive end Head and Bearing. 

Remove the non-drive end cap(18). Remove the non-drive end 

leadscrew nut(40), while holding the leadscrew from turning at 

the drive end. Do not allow the actuator carrier to bottom out 

on end of stroke. Remove head fasteners(5) from the non-drive 

end of actuator, remove that head(6). It is a slip fit between the 

bearing and leadscrew journal, but it may be necessary to ‘pull’ 

the head off w/ a puller tool as there may be some residual 

loctite holding the bearing on the leadscrew. Remove the 

bearing(17) from head by removing the snap ring(4). 

3. Remove Leads Screw Assembly. 

Remove carrier fasteners(32). Remove drive-end head 

fasteners(5), and remove leadscrew/head sub-assembly 

from actuator. Ballnut Style: *Caution is required if removal 

of the nut or leadscrew is required. Contact the factory for 

available parts and procedures. Plastic/Bronze Nut Style: 

The leadscrew may be threaded out of the nut assembly at 

this point. The nut and nut coupler are pinned and secured 

w/ Loctite at the factory. If nut is worn, and new nut assembly 

must be ordered. 

4. Remove Lead Screw and Bearing from Head. 

Secure the body of the leadscrew in a machinist vice or 

equivalent smooth jaw vice, then remove the locknut(2). 

Support the taper bushing (39) if possible and press the 

leadscrew out of bearing and bushing. The bearing is a press 

fit on screw journal, and the bushing locked on by means of a 

mating tapered interface. The snap ring(4) and the bearing(17) 

can now be removed from the head. 

Main Unit Assembly Instructions: 

1. Sub Assemble Head and Bearing to Lead Screw Assembly. 

Install the bearing(17) into the head(6) and install snap 

ring(4). Position over the leadscrew and nearest the drive 

end, the longer spacer(7) and the bumper(8). Position taper 

bushing(39), then bearing/head over leadscrew. It is necessary 

to press the bearing onto the leadscrew, ensure that the load is 

only applied to the inner race of the bearing. If not equipped to 

perform this it will be necessary to purchase this preassembled 

from the factory. Apply loctite 242 to the exposed threads 

of the leadscrew and install the spherical washer(3) and 

locknut(2) onto the threads of the leadscrew. Torque the 

locknut to 550 in-lbs, while leadscrew is secured in a machinist 

vice, or other smooth jaw vice 

solid nut actuators; or MOBIL HP MULTIPURPOSE PREMIUM 

GREASE for Ball Nut actuators. 

Install Leadscrew/Nut assembly in the tube such that as viewed 

from the motor end, the wedge side of tube is to the left. 

4. Install Idle Head and Tighten Heads to Tube. 

Attach and tighten the carrier(30) to the nut bracket(10). *On 

Auxiliary Carrier units, attach the nut bracket to the carrier 

nearest the motor end of the actuator. Attach the drive end 

Head to the end of Tube with four SHCS fasteners. Leave 

loose. 

Position bumper and short spacer(if applicable) over the 

leadscrew and into the tube at the non-motor end. Attach the 

idle end head to the tube with 4 SHCS sliding the bearing over 

the journal of the leadscrew. Leave loose. 

Move Carrier Assembly to motor-end of tube and tighten head 

bolts to 185-190 in-lbs. Support the actuator on the tube such 

that the head is free to float while tightening the head fasteners. 

Move Carrier Assembly to non-motor end of tube and torque to 

185-190 in-lbs. Support the actuator on the tube, such that the 

head is free to float while tightening the head fasteners. 

5. Secure non-motor end of leadscrew. 

Apply loctite 242 to the threads on the leadscrew and install the 

hexnut. Torque nut to 12-14 in-lbs. 

6. Lubricate Ballways and install Dust Band. 

Lubricate full length of the ballways(12) with Mobil HP grease. 

Install Dust Band(1) over Carrier(30) centering it along the 

length of the actuator. Slide the carrier cover(35) into slots of 

the carrier, and secure end caps(36) to the carrier. With tin 

snips cut ends as need such that dust band is 1/16" in from 

ends of heads. Install the band clamps(22) to the heads, and 

tighten down the set screws(23) locking the band in place. 

B3S Series is a trademark of Tolomatic 

Christo-Lube® is a registered trademark of Lubrication Technology, Inc., www. 

lubricationtechnology.com 

Loctite® is a registered trademark of the Loctite Corporation, www.loctite.com 

Magnalube®-G is a registered trademark of the Carleton-Stuart Corporation, www. 

magnalube-g.com 

Mobil grease® HP is a registered trademark of Mobil Oil Corporation, www.mobil.com 

2. Assemble Non-Drive end Head. 

Slip bearing into the head, and install the snap ring, flat side of 

ring toward the bearing. 

3. Assemble Lead Screw Assembly into the Tube. 

Grease Leadscrew on both sides of Nut Assembly with a thin 

film of appropriate grease: either CHRISTOLUBE MCG 303, for 

Tolomatic • URL: http://www.tolomatic.com • Email: help@tolomatic.com • Fax: (763) 478-8080 • Toll Free: 1-800-328-2174

4 – Parts Listing B3S20, M3S20 

Parts Sheet #3600-4130_11_B3S20ps 

Pages 4 & 5 show parts for units manufactured before 12-01-2004 

1 

29 

28 

27 

26 

25 

21 

22 

31 

30 

23 

24 

32 

6 

34 

33 

8 

7 

35 

9 

36 

37 

19 

17 

20 

13 

15 

10 11 14 



12 


18 

38 

2 

3 4 5 

a/r = As Required 

Parts Listing 

Item Part No. Description 

1*§ 3420-1239 Dust Band a/r a/r a/r a/r a/r a/r a/r a/r a/r a/r 

2 3420-1206 Lock Nut 2 2 2 2 2 2 2 2 2 2 

3 3420-1205 Lock Washer 2 2 2 2 2 2 2 2 2 2 

4 2100-1010 Retaining Ring 2 2 2 2 2 2 2 2 2 2 

5 1309-2020 SHCS 8 8 8 8 8 8 – – – – 

4925-1033 SHCS – – – – – – 8 8 8 8 

6 3420-1200 Actuator Head 2 2 2 2 2 2 – – – – 

4420-1200 Actuator Head – – – – – – 2 2 2 2 

7 3420-1208 Spacer – – – – 1 1 – – – – 

3420-1209 Spacer 1 1 – – – – 1 1 – – 

3420-1210 Spacer 1 1 1 1 1 1 1 1 1 1 

4420-1210 Spacer – – – – – – – – 1 1 

8 2332-1006 Bumper 2 2 2 2 2 2 2 2 2 2 

9* 3420-1201 Lead Screw, 1TPI, ACME, Std ST – – – – – – – – – 

3420-1250 Lead Screw, 1TPI, ACME, Ext OP – – – – – – – – – 

3420-1202 Lead Screw, 2TPI, ACME, Std – ST ST – – – – – – – 

3420-1251 Lead Screw, 2TPI, ACME, Ext – OP OP – – – – – – – 

* Specify stroke when ordering. § Available in Repair Kit No. 3420-9049. 

B3S20 M3S20 ST = Standard Configuration (Used with LMI) 

B3S20 M3S20 

OP = Optional Configuration, Extended Shaft 

(Used with Reverse Parallel) 

B3S20SN01 

B3S20SN02 

B3S20SNA02 

B3S20BN02 

B3S20BN05 

B3S20BNL05 

M3S20SN25 

M3S20SN12 

M3S20BN05 

M3S20BNL05 

B3S20SN01 

B3S20SN02 

B3S20SNA02 

B3S20BN02 

B3S20BN05 

B3S20BNL05 

M3S20SN25 

M3S20SN12 

M3S20BN05 

M3S20BNL05 


9* 3420-1203 Lead Screw, 2TPI, Ball, Std – – – ST – – – – – – 

3420-1252 Lead Screw, 2TPI, Ball, Ext – – – OP – – – – – – 

3420-1204 Lead Screw, 5TPI, Ball, Std – – – – ST ST – – – – 

3420-1253 Lead Screw, 5TPI, Ball, Ext – – – – OP OP – – – – 

4420-1201 Lead Scw, 12mm Lead, ACME, Std – – – – – – – ST – – 

4420-1250 Lead Scw, 12mm Lead, ACME, Ext – – – – – – – OP – – 

4420-1202 Lead Screw, 25mm Lead, V, Std – – – – – – ST – – – 

4420-1251 Lead Screw, 25mm Lead, V, Ext – – – – – – OP – – – 

4420-1203 Lead Screw, 5mm Lead, Ball – – – – – – – – ST ST 

4420-1252 Lead Screw, 5mm Lead, Ball – – – – – – – – OP OP 

10 3420-9062 Nut Bracket Assy, 1 TPI 1 – – – – – – – – – 

3420-9063 Nut Bracket Assy, 2TPI – 1 – – – – – – – – 

3420-9064 Nut Bracket Assy, BN, 2TPI – – – 1 – – – – – – 

A/R 3420-9065 Nut Bracket Assy, BN, 5TPI – – – – 1 1 – – – – 

3420-9066 Nut Bracket Assy, AB, 2TPI – – 1 – – – – – – – 

4420-9027 Nut Bracket (Metric), 12mm – – – – – – – 1 – – 

4420-9028 Nut Bracket (Metric), 25mm – – – – – – 1 – – – 


Parts Sheet #3600-4130_11_B3S20ps B3S20, M3S20 Parts Listing – 5 

Pages 4 & 5 show parts for units manufactured before 12-01-2004 

1 

29 

28 

27 

26 

25 

21 

2 

22 

31 

30 

23 

3 4 5 

24 

32 

6 

33 

7 

34 

8 

35 

9 

36 

37 

19 

38 

17 

20 

13 

15 

10 11 14 NOTE: Items shaded cannot be field installed 


12 


Drawing repeated for reference 

18 

a/r = As Required 

B3S20 

M3S20 

B3S20 

M3S20 

B3S20SN01 

B3S20SN02 

B3S20SNA02 

B3S20BN02 

B3S20BN05 

B3S20BNL05 

M3S20SN25 

M3S20SN12 

M3S20BN05 

M3S20BNL05 

Item Part No. Description Item Part No. Description 

10 4420-9029 Nut Bracket (Metric), 5mm – – – – – – – – 1 1 

11 3420-1013 Nut 4 4 4 4 4 4 – – – – 

4420-1013 Nut – – – – – – 4 4 4 4 

12 3420-1241 Rail Way 2 2 2 2 2 2 2 2 2 2 

13** 2406-1008 Magnet 2 2 2 2 2 2 2 2 2 2 

14 3420-1508 Machined Tube 1 1 1 1 1 1 – – – – 

4420-1501 Machined Tube – – – – – – 1 1 1 1 

15 3420-1240 Band Magnet 2 2 2 2 2 2 2 2 2 2 

16 This Number is Not Used 

17 3420-1222 Contact Bearing 2 2 2 2 2 2 2 2 2 2 

18 3420-9054 Head End Kit 1 1 1 1 1 1 – – – – 

4420-9054 Head End Kit – – – – – – 1 1 1 1 

19 3420-1496 Machined Wedge 1 1 1 1 1 1 1 1 1 1 

20 0605-1045 Socket Head Cap Screw A/R A/R A/R A/R A/R A/R A/R AR A/R A/R 

21 3420-1024 Carrier Way 2 2 2 2 2 2 2 2 2 2 

22 3420-1219 Upper Clamp 2 2 2 2 2 2 – – – – 

4420-1219 Upper Clamp – – – – – – 2 2 2 2 

23 3415-1455 Set Screw 4 4 4 4 4 4 – – – – 

4410-1017 Set Screw – – – – – – 4 4 4 4 

* Specify stroke when ordering. § Available in Repair Kit No. 3420-9049. 

** Also included in nut bracket assembly (Item10) 

B3S20SN01 

B3S20SN02 

B3S20SNA02 

B3S20BN02 

B3S20BN05 

B3S20BNL05 

M3S20SN25 

M3S20SN12 

M3S20BN05 

M3S20BNL05 

24 3420-1069 PLT Ball Return 2 2 2 2 2 2 2 2 2 2 

25 3415-1047 Upper Band Ramp 2 2 2 2 2 2 2 2 2 2 

26 1085-1075 Socket Head Cap Screw 2 2 2 2 2 2 – – – – 


27 3420-1014 Ball Return 2 2 2 2 2 2 2 2 2 2 

28 3420-1015 Right Ball Race 2 2 2 2 2 2 2 2 2 2 

29 3420-1032 Left Ball Race 2 2 2 2 2 2 2 2 2 2 

30§ 3420-1025 Wiper 2 2 2 2 2 2 2 2 2 2 

31 3420-2021 Machined Carrier 1 1 1 1 1 1 – – – – 

4420-1235 Machined Carrier – – – – – – 1 1 1 1 

32 3420-1223 Flathead Cap Screw 3 3 3 3 3 3 – – – – 

4420-1011 Flathead Head Cap Screw – – – – – – 3 3 3 3 

33 3420-1009 Ball 92 92 92 92 92 92 92 92 92 92 

34 3420-1019 Ball Return Tube 2 2 2 2 2 2 2 2 2 2 

35§ 3420-2022 Carrier Cover 1 1 1 1 1 1 1 1 1 1 

36§ 3420-2024 End Cap 2 2 2 2 2 2 2 2 2 2 

37 0605-1046 Socket Head Cap Screw 4 4 4 4 4 4 – – – – 


38 1820-1001 SCS, BTN 4 4 4 4 4 4 

4410-1719 SCS, BTN 4 4 4 4 


6 – Options B3S20, M3S20 


Reverse-Parallel Mounting Option 

12 14 

6 8 9 11 13 

4 

3 

2 

1 

15 16 

B3S20 

1:1 RATIO 2:1 RATIO 

M3S20 

1:1 RATIO 2:1 RATIO 

5 

7 

10 



MRV21,22,23,24 

MRS231,232,MRB21 

MRV31,32,33,MRB31,32 

MRS341,342,343 

MRB41,42 

MRV21,22,23,24 

MRS231,232,MRB21 

MRV31,32,33,MRB31,32 

MRS341,342,343 

MRB41,42 

MRV21,22,23,24 

MRS231,232,MRB21 

MRV31,32,33,MRB31,32 

MRS341,342,343 

MRB41,42 

MRV21,22,23,24 

MRS231,232,MRB21 

MRV31,32,33,MRB31,32 

MRS341,342,343 

MRB41,42 

1 3420-1641 SHCS, M6 X 1.0, 60 MM LONG, LOW HEAD, SST 1 1 1 1 

3420-1639 SHCS, M5 X 0.8, 55 MM LONG, LOW HEAD, SST 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 

2 0602-1613 COVER, B3B-23 FRAME 1 1 1 1 1 1 1 1 

0602-1620 COVER, B3B-34 FRAME 1 1 1 1 1 1 1 1 

3420-1620 COVER, B3B-51 FRAME 1 1 1 1 

3 0515-1064 TIMING BELT, 14.00-1/5-3/8 1 1 1 1 1 1 1 1 

0520-1070 TIMING BELT, 16.00-1/5-3/8 1 1 1 1 1 1 1 1 

3420-1247 TIMING BELT, 350-5M-19 1 1 

3420-1248 TIMING BELT, 400-5M-19 1 1 

4 0520-1067 CLAMP COLLAR, Ø.688 1 1 1 1 1 1 1 1 

3420-1627 CLAMP COLLAR, Ø.813 1 1 1 1 

5 0520-1067 CLAMP COLLAR, Ø.688 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 

6 3420-1255 PULLEY, 18 TEETH, .38 WIDTH 1 1 1 1 1 1 1 1 

0515-1191 PULLEY, 18 TEETH, .38 WIDTH 1 1 1 1 

0515-1192 PULLEY, 18 TEETH, .38 WIDTH 1 1 1 1 

3420-9190 PULLEY, 18 TEETH, 19MM WIDTH 1 1 1 1 

7 3420-1255 PULLEY, 18 TEETH, .38 WIDTH 1 1 1 1 1 1 1 1 

3420-1256 PULLEY, 36 TEETH, .38 WIDTH 1 1 1 1 1 1 1 1 

3420-1245 PULLEY, 18 TEETH, 19 MM WIDTH 1 1 

3420-1246 PULLEY, 36 TEETH, 19 MM WIDTH 1 1 

8 0510-1111 TRANTORQ, Ø.250 1 1 1 1 

0515-1181 TRANTORQ, Ø.375 1 1 1 1 

9 0601-1053 PLATE, MOTOR, 23 FRAME 1 1 1 1 1 1 1 1 

0602-1057 PLATE, MOTOR, 34 FRAME 1 1 1 1 1 1 1 1 

3420-1611 PLATE, MOTOR, 40 FRAME 1 1 1 1 

10 0803-1227 SHCS, 1/4-20, .75 LONG, LOW HEAD 4 4 4 4 4 4 4 4 4 4 

3420-1649 SHCS, M6 X 1.0, 25 MM LONG, LOW HEAD 4 4 4 4 4 4 4 4 4 4 

11 0602-1603 HOUSING, BCS20/B3S20-23 FRAME 1 1 1 1 1 1 1 1 

0602-1610 HOUSING, BCS20/B3S20-34 FRAME 1 1 1 1 1 1 1 1 

3420-1610 HOUSING, BCS20/B3S20-40 FRAME 1 1 1 1 

12 0601-1625 SCREW, #6 X .25, SELF-TAPPING, SST 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 

13 0602-1602 END CAP 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 

3420-1602 END CAP 2 2 2 2 

14 2212-1010 SFHCS, 1/4-20, .75 LONG 4 4 4 4 

15 3420-1612 PLATE, ADAPTER, 40 FRAME 1 1 1 1 

16 2212-1098 SHCS, M5 X 0.8, 20 MM LONG, SST 4 4 4 4 

2212-1099 SHCS, M5 X 0.8, 25 MM LONG, SST 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 



REVERSE PARALLEL DISASSEMBLY INSTRUCTIONS 

1. Remove End Cap’s (13). Release tension on belt by 

breaking loose the motor fasteners (16). 

2. Remove RP Cover (2). 

3. Remove both drive pulley (6) and driven pulley (7) from 

their respective shafts. The belt (3) will come off with 

the pulley’s. 

4. Remove motor fasteners (16) from the motor plate (15), 

to remove the motor from the RP case. 

5. Remove the RP case (11) from the head by removing 

fasteners (10). 

REVERSE PARALLEL ASSEMBLY INSTRUCTIONS 

*Apply Loctite #242 to all fasteners upon installation 

1. Install RP case (11) to the head with cap screws (10). 

2. Install the motor to the RP case with fasteners (16). Do 

not tighten the fasteners at this time. 

3. Locate the belt (3) over the pulleys and slide the 

drive(6) and driven (7) pulleys over their respective 

shafts. Tighten each pulley to it’s shaft with either trantorque 

or collar clamp. If trantorque, utilize torque 

wrench to apply appropriate torque. 1/2” hex on trantorque 

apply 75 in-lbs. 5/8” hex on trantorque apply 100 

in-lbs. 

4. Verify that there is clearance between the inside of the 

RP case and each pulley. Verify that the pulleys are 

aligned to each other. 

5. Position the cover (2) in mating slot of the RP case and 

install the SHCS (1) to hold in place. 

6. Tension the belt by pulling the motor away from the 

drive shaft with the appropriate force in the chart below. 

Tighten the motor fasteners while this force is applied to 

the motor. 

Motor Frame 

MRB23, MRS23 

MRV23, MRS34 

MRV34, MRB34 

Tension Force 

10 lbs 

20 lbs 

30 lbs 

7. Install both end caps (13) with the screws (12) to finalize 

assembly. 




54 

62 

55 

61 

56 

25 

24 

19 

51 

50 

52 

53 

60 

59 

2 

40 

23 

34 

35 36 

32 

33 

31 

28 

27 

42 

26 

43 

39 

38 

41 


B3S20D 

Item 

Part No. 

M3S20D 

Part No. 

Description QTY. 

2. 3420-1028 3420-1028 Dust Band 1 

19. 3420-1023 3420-1023 Rail Way 2 

23. 3420-1022 3420-1022 Band Magnet 2 

24. 3420-1020 3420-1020 Machined Rail 2 

25. 3420-1008 4420-1008 Rail Nut AR 

26. 3420-2024 3420-2024 End Cap 2 

27. 3420-2022 3420-2022 Carrier Cover 1 

28. 3420-1019 3420-1019 Ball Return Tube 2 

31. 3420-1009 3420-1009 Ball 92 

32. 3420-1025 3420-1025 Wiper 2 

33. 3420-2021 4420-1235 Machined Carrier 1 

34. 3420-1014 3420-1014 Ball Return 2 

35. 3420-1015 3420-1015 Right Ball Race 2 

36. 3420-1032 3420-1032 Left Ball Race 2 

38. 1085-1075 0610-1033 Socket Head Cap Screw 2 

39. 3415-1047 3415-1047 Upper Band Ramp 2 

40. 3420-1077 4415-1018 Socket Head Cap Screw AR 

Item 

B3S20D M3S20D 

Part No. Part No. 

Description QTY. 

41. 3420-1069 3420-1069 PLT Ball Return 2 

42. 3420-1024 3420-1024 Carrier Way 2 


50. 3420-1049 4420-1049 Plate, Conn., Dual Carrier 2 


52. 3420-1054 4420-1054 Plate, Dual Carrier 1 



55. 3420-1053 3420-1053 Tube Support 1 

56. 3420-1267 4420-1218 Head, Dual 180° 2 

59. 3420-1019 4420-1219 Clamp, Upper 2 

61. 3420-1013 4420-1013 Nut 4 

62. 3415-1219 3415-1219 Set Screw 2 



In-Line Gear Head Mounting Option 

1 

2 

In-line mounting 

In-line mounting 

with gear head 

In-Line Motor Mounting Option 



MRB34 

MRS34X 

MRV34X 

MRB40X 

MRV23X 

MRS234X 

MRS23 

MRB23 

MRB34 w/ GHJ30, 31 

MRS34X w/ GHK30 

MRV34X w/ GHJ30, 31 

MRV23X w/ GHJ20, 21 

MRV234X w/ GHJ20, 21 

MRB23 GHK20 

1 0520-9201 Motor Adapter Kit 1 1 1 1 

3420-9200 Motor Adapter Kit 1 1 1 1 1 1 

3420-9204 Motor Adapter Kit 1 

3420-9201 Motor Adapter Kit 1 1 1 

4520-9201 Motor Adapter Kit - Metric 1 1 1 1 

4420-9200 Motor Adapter Kit - Metric 1 1 1 1 1 1 

4420-9204 Motor Adapter Kit - Metric 1 

4420-9201 Motor Adapter Kit - Metric 1 1 1 

2 3600-9252 Coupler 1 1 

3600-9253 Coupler 1 1 

3600-9213 Coupler 1 1 1 1 

3600-9218 Coupler 1 

3600-6173 Coupler 1 1 1 

3600-6174 Coupler 1 1 1 




Absolute Position Feedback Option 

Discontinued 

Option: Parts 

Sheet is for 

REFERENCE use 

only. 

§3 

§2 

*14 

*13 *~5 *11 

*12 

*11 *10 *9 *8 

*7 

*~6 

§1 

*4 

*7 

*15 

*16 

*~17 


ITEM PART No. DESCRIPTION QTY 

§1 3420-2123 TUBE,MACH,B3S20,SPL,APF 1 

§2 3420-2118 CARRIER,MACH,B3S20,SPL, 1 

§3 2224-1016 MAGNET, ROD, DIA .250 x .250 1 

*4 3420-2101 HSNG,MACH,APF SUB-ASSY 1 

*~5 3604-1572 CONNECTOR,MALE,S32,8-PIN, 1 

*~6 3604-1571 CIRCUIT BOARDS,ANALOG 1 

*7 3420-2106 GSKT,SPCR,APF SUB-ASSY 2 

*8 3420-2104 SPACER,AL,APF SUB-ASSY,.035 THK 1 

*9 3420-2105 GSKT,WG END,APF SUB-ASSY 1 

*10 3420-2102 CAP,END,WG END,APF SUB-ASSY 1 

*11 3420-2107 SCREW,S-TAP,#6-32X0.38,SS 8 

*12 3420-2108 SFHCS,M3-0.5X6MM,SS 1 

*13 3420-2103 CAP,END,CNCTR END,APF SUB-ASSY 1 

*14 3420-2110 NUT,T,B3S/BC320,ALUM 1 

*15 3420-2109 SHS,BTN,5/16-18X0.50,SS 1 

*16 0602-1056 SBHCS, M3 x 0.5 x 6mm, SST 1 

*~17 3604-1570 WAVEGUIDE,VARIOUS LENGTHS, 1 

§ Shaded items cannot be field installed without proper fixtures, for repair, return 

actuator to Tolomatic 

* Available in APF Sub-Assembly 3420-9360 

~ Available in Transducer Sub-Assembly 3604-9710 

NOTE: The APF Option is NOT available as a field retrofit option. 

All B3S electric actuators with the APF Option have been factory 

tested to verify performance and calculate a calibration ratio (or 

multiplier). This APF Ratio is recorded on a separate "APF Option" 

label, affixed to the extruded tube, in both [in./volt] and [mm/volt] 

units. 

To use this APF Ratio in your application, follow this procedure: 

1.) Start with carrier in home position. 

2.) Multiply initial voltage reading from sensor by APF Ratio. This is 

your offset value. 

3.) To determine position relative to home, multiply voltage reading by 

APF Ratio then subtract offset. 

Position = (Voltage Reading * APF Ratio) - offset 

NOTE: This procedure assumes a 0-10V signal. If using a +/- 10V signal, 

add ten to voltage reading before multiplying by APF Ratio. 

Example: Assume a 0-10V signal and APF Ratio = .90 in./volt. 

With carrier in home position, the voltage reading is .12 volts. Multiplied 

by the APF Ratio of .90 in./volt, the offset is .108 in. If the carrier is 

moved to another location and the voltage reading is 4.34 volts, the 

new position is: (4.34 volts * .90 in./volt) - .108 in. = 3.798 +/-.005 in. 

To optimize performance in the application, a new APF Ratio can be calculated 

after installation. This will account for any variations in the application's 

start & end of stroke. For assistance with calculating a new APF 

Ratio, contact Tolomatic at 1-800-328-2174 or info@tolomatic.com 



SWITCH KIT 

1 2 

3 

4 

TUBE SUPPORT KIT 

Optional Accessories Parts Listing 

Item 

B3S20 

Part No. 

M3S20 

Part No. Description QTY. 

SWITCH KIT 

Part Number Ordering Config. Code Ordering 

No Mounting Hardware or FE conn. included Mounting Hardware & FE conn. included 

Part NO. Description Code 

3600-9084 Switch Only, Reed, Form C, 5m BT 

3600-9085 Switch Only, Reed, Form C, Male Conn. BM 

3600-9082 Switch Only, Reed, Form A, 5m RT 

1 

3600-9083 Switch Only, Reed, Form A, Male Conn. RM 

3600-9086 Switch Only, Triac, 5m CT 

3600-9087 Switch Only, Triac, Male Conn. CM 

3600-9090 Switch Only, Hall-effect, Sinking, 5m KT 

3600-9091 Switch Only, Hall-effect, Sinking, Male Conn. KM 

3600-9088 Switch Only, Hall-effect, Sourcing, 5m TT 

3600-9089 Switch Only, Hall-effect, Sourcing, Male Conn. TM 

2503-1025 Connector (Female) 5 meter lead 

NOTE: When ordered by Config. Code Female connector & all mounting hardware is included 

2 3420-9999 3420-9999 Switch Hardware Kit 1 

5 

6 

7 

MOUNTING 

PLATE KIT 

8 

9 

10 

Item 

B3S20 

Part No. 

M3S20 

Part No. Description QTY. 

TUBE SUPPORT KIT 

3420-9006 4420-9006 KIT Includes all parts listed below 

3 2317-1015 4415-1011 

SHCS, 5/16-18 x .63/ M8 x 

1.25 x 12 

4 

4 3415-1046 4415-1014 

SFHCS, 1/4-20 x .44/ M6 

x 1 x 10 

4 

5 3420-1013 4420-1013 B3S20 Nut 4 

6 3420-1044 3420-1044 Tube Support 2 

7 3420-1013 4420-1013 B3S20 Nut 4 

Mounting Plate Kit 

3420-9056 4420-9030 KIT Includes all parts listed below 

8 3420-1013 4420-1013 T-Nut 2 

9 3420-1232 3420-1232 Mounting Plate 1/2" 1 

10 2307-1018 4415-1011 Socket Head Cap Screw 2 

Switch Ordering NOTES: 

To order field retrofit switch and hardware kits for all Tolomatic actuators: 

SW (Then the model and bore size, and type of switch required) 

Example: SWB3S20RT 

(Hardware and Form A Reed switch with 5 meter lead for 2" size 

B3S actuator) 

Mounting hardware is required if replacing switch for any actuator 

manufactured before 7/1/97 

OPTIONAL ACCESSORY ASSEMBLY INSTRUCTIONS 

1. TUBE SUPPORTS. Four T-Nuts (5, 7) are required on each side of the 

Tube, two T-Nuts on bottom of Tube and two in lower slots on tube sides. 

Tube Supports should be secured at the required distances determined 

for the application to prevent Tube deflection. Apply Loctite #242 to Screws 

(3, 4) and secure Tube Supports (6) to Tube aligning holes in T-Nuts with 

holes in Tube Supports. 

2. Switches. Secure Switch (1) to magnet side of Tube with Switch Clamp 

(2) and Set Screw. 

3. SWITCHES 

NOTE: Form A Reed Switches should not be used in TTL logic 

circuits. A voltage drop caused by the L.E.D. indicator will result.For 

applications where TTL circuits are used, please contact the factory. 

WARNING: An ohmmeter is recommended for testing Reed Switches. 

NEVER use an incandescent light bulb as a high current rush may 

damage the switch. 

Reed and TRIAC switches are only recommended for signalling position, 

not directly powering solenoids. For shifting a solenoid, a relay 

or resistor is recommended between it and the Reed Switch. Switch 

ratings must not be exceeded at any time. 

NOTE: For Hall Effect Switch Magnet, be sure the S pole of the magnet 

(indicated with black dot) is facing toward the switch (down). 


300 

100 

POWER LED None 

400 

None 

200 REED FORM C 

SIgNAL LED Red 

PNP (Sourcing) Norm 

SWITCHINg LOgIC "A" Normally Open "C" Normally Open or Closed Triac Normally Open 

Open 

100 

200 

50 

OPERATINg VOLTAgE 200 Vdc max. 120 Vdc max. 

MECHANICAL CONTACTS Single-Pole Single-Throw Single-Pole Double-Throw Single-Pole Single-Throw NO, These Ar 

12 0– Switches 0 B3S20, M3S20 

Parts OuTPuT RATINg Sheet #3600-4130_11_B3S20ps 

— 

0 20 40 60 80 100 120 140 160 

0 20 40 60 80 100 120 140 COIL 160 DIRECT 0 Yes Yes Yes 

OPERATING TEMPERATURE ( F) 

OPERATING TEMPERATURE ( F) 

0 100 200 300 400 500 0.6 msec max. 

0.7 msec max. 

POWER LED None 

OPERATINg TIME 

CURRENT D.C (mA) 

(including bounce) 

None 

None 

None 

(including bounce 

SIgNAL LED Red 

OPERATINg TEMPERATuRE -40°F 

Red 

[-40°C] to 158°F 

OPERATINg VOLTAgE 200 Vdc max. 120 Vdc 

WIRINg DIAgRAMS 

INSTALLATION RELEASE 

max. 

INfORMATION 

TIME 

120 Vac max. 

1.0 msec. max. 

OuTPuT RATINg — 

R T & R M DC REED, fORM A C T & C M 

ON TRIP POINT 

— 

— 

25 

AC REED, TRIAC 

0.6 msec max. 

0.7 msec 

Off 

max. 

OPERATINg TIME 

TRIP POINT — — 

< 

(including bounce) (including bounce) 

(+) 

BROWN 

**POWER RATINg (WATTS) THE NOTCHED 10.0 § 3.0 

OPERATINg 

LOAD 

(+) 

AC TEMPERATuRE -40°F [-40°C] to 158°F [70°C] 0°F § § 

[-18 

REED 

VOLTAgE DROP 

COM 

fACE 2.6 Of V typical THE at 100 mA NA 

RELEASE TIME 1.0 msec. max. — 

BLUE SWITCH 

SWITCH INDICATES 

(-) 

120Vac MOV 

RESISTANCE 

0.1 Ω Initial (Max.) 

ON TRIP POINT — — 150 

(-) 

Max. 

LOAD 

THE SENSINg 

Off TRIP POINT — CuRRENT CONSuMPTION 

OR 

SuRfACE — AND — 

40 

BLUE 

BROWN **POWER RATINg INPUT (WATTS) 10.0 § 3.0 § § MuST fACE 

(+) 

BROWN 

fREQuENCY 

10.0 

— 

VOLTAgE DROP 2.6 V typical at 100 mA TOWARD THE 

(+) 

CABLE MIN. 

NA 

STATIC 

— 

REED 

MAgNET. 

LOAD 

TRIAC 

RESISTANCE 0.1 Ω Initial (Max.) BEND 

— 

BLUE SWITCH 

SWITCH 

RADIuS DYNAMIC 

(-) 

1 Amp at 0.5 Amp at 

CuRRENT CONSuMPTION — 

20 

(-) 

86°F [30°C] 140°F [60°C] 

CAuTION: DO NOT OVER TIgHTEN SWITCH HARDWARE WHEN 

fREQuENCY — 47 - 63 Hz 

** WARNINg: Do not exceed power rating (Watt = Voltage X Amperage). P 

B T & B M DC REED, fORM C 

CABLE MIN. STATIC 

0.630" [16mm] 

Some actuators BEND may 

*QD = Quick Disconnect; Male coupler is located 6" [152mm} from senso 

COMMON 

BROWN 

require RADIuS switch mounting 

on a specific side Manufactured REPLACEMENT before July Of 1, 

DYNAMIC Replacement of QD Switches Female Not Recommended coupler to fl ying lead (part #2503-1025 

THE NOTCHED 

NORMALLY CLOSED 

BLACK REED 

gROOVE QD 1997: SWITCHES IN THE MANufACTuRED BEfORE J 

BLUE SWITCH 

of the 

CAuTION: 

assembly. 

DO 

Call 

NOT OVER TIgHTEN It will SWITCH be necessary HARDWARE WHEN INSTALLINg! 

ACTuATOR 

NORMALLY OPEN 

Tolomatic ** WARNINg: for details. Do not exceed power to rating replace (Watt or = Voltage CuRRENT X Amperage). Permanent BLUE damage to BROWN sensor will occur. 

INDICATES THE OLD 

*QD = Quick Disconnect; Male coupler rewire is located the 6" [152mm} 

Quick 

from 

disconnect 

sensor, - 

Wiring gROOVE TO + 

Quick disconne 

Wiring 

T T & T M HALL-EffECT, SOuRCINg, PNP K T & K M HALL-EffECT, SINKINg, NPN 

Female coupler female to end fl ying lead (part #2503-1025) distance 

INSTALL BLACK is 197" [5m] 

THE 

also see Cable Shielding specifi catio 

REPLACEMENT Of QD SWITCHES coupler. MANufACTuRED BEfORE JuLY 1, SWITCH. 1997: SIGNAL It will CONTACT be necessary to replace or rewire the 

BROWN(+) 

(+) 

BROWN(+) 

(+) 

† 

Shielded from the female TOLOMATIC quick disconnect IF coupler to the fl ying leads. Shie 

HALL-EFFECT 

CuRRENT 

BLUE 

BROWN 

BLUE 

BROWN 

§ SWITCHES ARE 

SOURCING 

BLACK 

OLD 

HALL-EFFECT 

Maximum current 500mA (not to exceed 10VA) Refer to Temperature Reed Switc vs. C 

BLACK Quick disconnect + 

REQUIRED ON 

SWITCH 

SINKING 

- 

Quick disconnect SIGNAL 

Wiring 

§§ 

- 

200,000,00 

BLUE (-) 

Wiring Maximum current 250mA (not to exceed 3VA) Refer to Temperature vs. C 

SWITCH 

BLACK 

BLUE (-) 

ANOTHER BLACKSIDE OF 

rent, duty cy 

(-) 

(-) LOAD SIGNAL 2503-1025 Female Connector 5M ACTUATOR. + 

LOAD 

† 

Shielded from the female quick disconnect coupler to the fl ying leads. Shield should be terminated at fl ying lead end. 

§ 

Maximum current 500mA (not to exceed 10VA) Refer to Temperature vs. Current graph and Voltage Derating graph 

§§ 

Maximum current 250mA (not to exceed 3VA) Refer to Temperature vs. Current graph and Voltage Derating graph 

LOAD CURR 

LOAD CUR 

VOLTAGE A.C 

REE D 

FORM 

C 

REED FORM A 

Christo-Lube® is a registered trademark of Lubrication Technology, Inc., www.lubricationtechnology.com 

Loctite® is a registered trademark of the Loctite Corporation, www.loctite.com 

Magnalube®-G is a registered trademark of the Carleton-Stuart Corporation, www.magnalube-g.com 

3800 County Road 116, Hamel, MN 55340 

http://www.Tolomatic.com • Email: Help@Tolomatic.com 

Phone: (763) 478-8000 • Fax: (763) 478-8080 • Toll Free: 1-800-328-2174 

© 2011 Tolomatic 201105060803 

8 

Information furnished is believed to be accurate 

and reliable. However, Tolomatic assumes no 

responsibility for its use or for any errors that 

may appear in this document. Tolomatic reserves 

the right to change the design or operation of the 

equipment described herein and any associated 

motion products without notice. Information in 

this document is subject to change without notice.

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