Couplings

REX ® THOMAS ® FLEXIBLE DISC COUPLINGS
Couplings
SPACER TYPE DBZ-C
DBZ-C couplings use the same disc pack and materials as the DBZ. The center member is available in a variety of lengths and is
recommended for ANSI and API process pumps. The “drop out” center member feature of this coupling allows for coupling maintenance and
pump seal replacement with out disturbing the connected equipment.
Construction
Hubs and Center Assembly: Carbon Steel
Bolts: Alloy Steel
Disc Packs: Tomaloy
Coatings Available: Black Oxide, Zinc, Cadmium
Other materials such as Stainless Steel, Monel
and Inconel are available; please consult
Rexnord Industries, Inc.
Misalignment: 1 /2° per disc pack
Coupling
Size
101
•
Stocked “C” Dimensions
“C” Dimensions
3.5
4 4.38
4.75
5 5.
5 7 7.
5 8
126
• • •
163
• • • • • •
201
• • • • •
226
• • • •
263
• • •
301
• •
351
•
401
•
General Dimensions (inch)
➁➄
Cplg.
Size
Max
Bore
A B Std.
C Min.
C F G N
50
0.63
2.00
0.88
3 .50
– 5.26
1.00
0.24
62
0.75
2.44
1.09
3 .50
– 5.68
1.19
0.32
75
0.88
2.69
1.13
3 .50
– 5.76
1.44
0.33
101
1.16
3.22
1.38
3 .50
– 6.26
1.69
0.45
126
1.38
3.84
1.63
3.50
2.88
6.76
2.06
0.52
163
1.88
4.56
1.88
3.50
2.88
7.26
2.75
0.52
201
2.25
5.34
2.13
3.50
3.31
7.76
3.28
0.59
226
2.63
6.06
2.63
5.00
4.31
10.26
3.78
0.98
263
3.00
7.00
3.00
5.00
4.75
11.00
4.44
1.04
301
3.50
8.00
3.44
5.50
5.44
12.38
5.06
1.11
351
4.00
9.38
4.06
7.50
6.38
15.62
5.81
1.34
401
4.50
10.69
4.63
8.00
6.94
17.26
6.63
1.44
451
4.75
12.13
5.25
9.50
7.69
20.00
7.38
1.55
Engineering Data
Max
Horsepower
➂
Per 100 RPM M ax. RPM
Weight
Max.
Peak
Change
WR
2
Service
Continuous Overload ➁ Per inch ➄ Change Per
Axial
Coupling Factor
Not
Torque Torque Weight of “C” WR
2 Inch of “C” Capacity
Size 1 Balanced
Balanced
(lb.-in.) (lb.-in.) (lb.) (lbs.) ( lb.-in.
2
) ( lb.-in. 2
) (in.)
50
0.27
6,000
9,500
170
340
1.
0 0.075
0.45
0.016
±0.023
62
0.46
6,000
8,600
290
580
1.
8 0.091
1.
4 0.027
±0.028
75
0.65
6,000
8,200
410
820
2.
4 0.11
1.
8 0.051
±0.032
101
1.30
6,000
7,500
820
1,640
4.
6 0.28
6.
0 0.16
±0.038
126
2.22
5,500
6,800
1,400
2,800
7.
4 0.45
13.
0 0.36
±0.046
163
3.09
5,000
6,300
1,950
3,900
10.
8 0.43
27.
4 0.70
±0.057
201
5.60
4,600
5,700
3,530
7,060
16.
4 0.67
60.
3 1.
6 ±0.067
226
10.
0 4,100
5,500
6,300
12,600
24
0.78
104
2.
4 ±0.076
263
15.
7 3,700
5,000
9,900
19,800
37
0.93
220
4.
1 ±0.089
301
23.
5 3,300
4,700
14,800
29,600
54
1.20
425
6.
9 ±0.102
351
41.
3 2,900
4,400
26,000
52,000
91
1.80
970
13
±0.118
401
60.
3 2,700
4,100
38,000
76,000
135
2.70
1,860
26
±0.136
451
79.
3 2,600
3,800
50,000
100,000
190
3.10
3,240
36
±0.154
For ordering instructions, see Page 10-11.
➀ All Thomas disc couplings meet NEMA frame sleeve bearing motor specifications without modification or the addition of end-float restrictin g
devices.
➁ Popular sized bores with keyway and setscrew are stocked. Consult your Rexnord representative for stock bore size availability .
➂ See page 7 for explanation of RPM limits and balancing recommendations .
➃ Weight
and WR2 as shown are for maximum bores and standard. “C”.
➄ Consult Rexnord for minimum rough bore sizes.
20
Note: Dimensions subject to change. Certified dimensions of ordered material furnished on request.
A G
N N
B
C
F
B
ALSO AVAILABLE WITH TAPERED-BORE HUBS
AXIAL
CAPACITY
➀