Modified Stock Gearing - Boston Gear

Mounted Ball Bearings
MB Series
Pillow Blocks – Medium Duty; Extended Inner Race – Setscrew Locking
F
Features —
One-piece high grade cast iron housing.
Deep groove ball bearings for high radial and thrust loads.
Precision machined housing bore and spherical race for full self-alignment.
Synthetic lip type seal with steel flinger.
Positive locking by setscrews through extended inner race.
1/4-28 threaded grease fitting and channel through outer race allow relubrication.
ORDER BY CATALOG NUMBER OR ITEM CODE
Bore
Catalog
Number
Item
Code
K
E MAX.
E MIN.
STANDARD TOLERANCES
Dimensions
Tolerance
Bore All +.001 to –.000
F
H
R S L
B
P
G
C
A
J
1-7/16 MB-1-7/16 64573
1-1/2 MB-1-1/2 64574
1-11/16 MB-1-11/16 64575
1-3/4 MB-1-3/4 64576
1-15/16 MB-1-15/16 64577
2 MB-2 64578
2-3/16 MB-2-3/16 64579
2-1/4 MB-2-1/4 64580
2-7/16 MB-2-7/16 64581
2-1/2 MB-2-1/2 64582
2-11/16 MB-2-11/16 64583
2-15/16 MB-2-15/16 64584
3 MB-3 64585
3-3/16 MB-3-3/16 64586
3-1/4 MB-3-1/4 64587
3-7/16 MB-3-7/16 64588
3-1/2 MB-3-1/2 64589
Bore A B C
E
Min.
E
Max.
ALL DIMENSIONS IN INCHES
R* Approx.
Bolt
F G H J K L P Setscrew S
Size
Weight
(UNF)
(Lbs.)
1-7/16 2-1/8 4-3/16 2-17/64 5-1/16 6-5/16 6-1/2 2-1/4 3/4 9/16 1-3/16 3/4 1-27/32 5/16-24 1-9/64 1/2 6.8
1-1/2 2-5/16 4-9/16 2-1/2 5-9/16 6-11/16 8-1/4 2-5/8 13/16 11/16 1-1/4 3/4 2-3/32 5/16-24 1-3/16 5/8 9.0
1-11/16
1-3/4 2-5/16 4-5/8 2-19/32 5-1/2 6-3/4 8-1/4 2-5/8 13/16 11/161-5/16 3/4 2-17/64 5/16-24 1-9/32 5/8 9.5
1-15/16
2 2-1/2 5-1/16 2-3/4 6 7-1/2 8-7/8 2-7/8 7/8 11/161-7/16 7/8 2-23/32 5/16-24 1-5/16 5/8 11.7
2-3/16
2-1/4 2-3/4 5-5/8 3-1/8 6-5/8 7-7/8 9-5/8 3-1/8 1-1/16 13/161-7/16 1 3-1/32 3/8-24 1-9/16 3/4 16.2
2-7/16
2-1/2
3 6-3/16 3-3/8 7-3/16 8-13/16 10-3/8 3-1/4 1-1/16 13/16 1-5/8 1-3/16 3-27/64 3/8-24 1-3/4 3/4 21.5
2-11/16 3-1/2 6-15/16 3-3/8 7-15/1610-1/16 11-7/8 3-1/2 1-1/8 15/16 2 1-5/16 3-43/64 3/8-24 1-3/4 7/8 29.2
2-15/16
3 3-1/2 7-1/8 3-11/16 7-15/1610-1/16 11-7/8 3-1/2 1-1/4 15/16 2 1-5/16 3-7/8 1/2-20 1-15/16 7/8 31.5
3-3/16
3-1/4
4 8 4-1/32 9-3/4 12-1/2 15 4 1-1/4 15/162-5/161-11/32 4-3/16 1/2-20 2-1/32 7/8 41.1
3-7/16
3-1/2
4 8-1/4 4-13/32 9-11/1612-9/16 15 4-3/8 1-5/16 15/16 2-3/8 1-9/16 4-25/64 1/2-20 2-7/32 7/8 47.8
*2 at 120°
For Load Ratings, See Engineering Section, Page 237.
Replacement Bearings are shown on Page 214.
222 Boston Gear 800-825-6544 P-1930-BG 04/10