Machinery's Handbook, 31st Edition
2460
Ball and Roller Bearings Table 10. AFBMA and American National Standard Tolerance Limits for Needle Roller Bearings, Drawn Cup, Without Inner Ring — Inch Types NIB, NIBM, NIY, NIYM, NIH, and NIHM ANSI/ABMA 18.2-1982 (R1999) Ring Gage Bore Diameter a Basic Bore Diameter under Needle Rollers, F w Allowable Deviation from F w a Allowable Deviation from Width, B Basic Outside Diameter, D Inch Deviation from D Inch Inch Inch Inch Over Incl. Over Incl. Low High High Low 0.1875 0.9375 +0.0005 0.9375 4.0000 − 0.0005 0.1875 0.6875 +0.0015 +0.0024 +0 − 0.0100
0.6875 1.2500 1.3750 1.6250 1.8750 2.0000 2.5000
1.2500 +0.0005 +0.0014 1.3750 +0.0005 +0.0015 1.6250 +0.0005 +0.0016 1.8750 +0.0005 +0.0017 2.0000 +0.0006 +0.0018 2.5000 +0.0006 +0.0020 3.5000 +0.0010 +0.0024
+0 +0 +0 +0 +0 +0 +0
− 0.0100 − 0.0100 − 0.0100 − 0.0100 − 0.0100 − 0.0100
For fitting and mounting practice see Table 19.
− 0.0100 a The bore diameter under needle rollers can be measured only when bearing is pressed into a ring gage, which rounds and sizes the bearing. Table 11. AFBMA and American National Standard Tolerance Limits for Needle Roller Bearings, Drawn Cup, Without Inner Ring — Metric Types NB, NBM, NY, NYM, NH, and NHM ANSI/ABMA 18.1-1982 (R1999) Ring Gage Bore Diameter a
Allowable Deviation from F w a Micrometers Low High
Allowable Deviation from Width, B
Basic Bore Diameter under Needle Rollers, F w
Basic Outside Diameter, D
Deviation from D Micrometers
mm
mm
Micrometers
Over
Incl.
Over
Incl.
High
Low − 250 − 250 − 250 − 250
6
10 18 50 80
3 6
6
+10 +13 +20 +25 +30
+28 +31 +41 +50 +60
+0 +0 +0 +0 +0
− 16 − 20 − 28 − 33
10 30 50 …
10 30 50 70
18 30
… … 50 − 250 a The bore diameter under needle rollers can be measured only when bearing is pressed into a ring gage, which rounds and sizes the bearing. For fitting and mounting practice, see Table 19. Table 12. AFBMA and American National Standard Tolerance Limits for Needle Roller Bearings, With Cage, Machined Ring, Without Inner Ring— Inch Type NIA ANSI/ABMA 18.2-1982 (R1999) Basic Outside Diameter, D Allowable Deviation From D of Single Mean Diameter, D mp Basic Bore Diameter under Needle Rollers, F w Allowable Deviation from F w Allowable Deviation from Width, B
Inch
Inch
Inch
Inch
Inch
Over
Incl.
High
Low Over
Incl.
Low
High High Low
0.7500 2.0000 +0 2.0000 3.2500 +0 3.2500 4.7500 +0 4.7500 7.2500 +0 7.2500 10.2500 +0 10.2500 11.1250 +0
+0.0017 +0 +0.0018 +0 +0.0019 +0 +0.0020 +0 +0.0021 +0 +0.0023 +0 +0.0024 +0 +0.0026 +0 +0.0027 +0 +0.0029 +0 +0.0030 +0 +0.0032 +0
− 0.0005 0.3150 0.7087 +0.0008 − 0.0006 0.7087 1.1811 +0.0009 − 0.0008 1.1811 1.6535 +0.0010 − 0.0010 1.6535 1.9685 +0.0010 1.9685 2.7559 +0.0011 − 0.0012 2.7559 3.1496 +0.0011 − 0.0014 3.1496 4.0157 +0.0012
− 0.0050 − 0.0050 − 0.0050 − 0.0050 − 0.0050 − 0.0050 − 0.0050 − 0.0050 − 0.0050 − 0.0050 − 0.0050 − 0.0050
… … … … 4.0157 4.7244 +0.0012 … … … … 4.7244 6.2992 +0.0013 … … … … 6.2992 7.0866 +0.0013 … … … … 7.0866 7.8740 +0.0014 … … … … 7.8740 9.2520 +0.0014
For fitting and mounting practice, see Table 20.
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