Standard and special bearings are held to the following tolerances:

Bearings	Dimensions	Tolerances
Plain and Flanged Bearings	Inside and Outside Diameters	±.001 (.025) for bearings up to 1-1/2" (38.10) ID. ±.0015 (.038) for bearings over 1-1/2" (38.10) ID. ±.002 (.051) for bearings over 2-1/2" (63.50) ID.
	Length	±.005" (.127) for bearings up to 1-1/2" (38.10) ID. ±.0075" (.191) for bearings over 1/1/2" (38.10) up to 3" (76.20) in length. ±.010" (.254) for bearings over 3" (76.20) in length.
All	Concentricity	.0015" (.038) [0.003" (.076) total indicator reading] for bearing up to 1-1/2" (38.10) ID. .002" (.051) [0.004" 9.102) total indicator reading] for bearings over 1-1/2" (38.10) ID.
Thrust Bearings	Inside Diameter	±.0015" (.038) for bearings up to 1-1/4" (31.75) ID. ±.005" (.127) for bearings over 1-1/4" (31.75) ID.
	Outside Diameter	±.005" (.127) for bearings up to 1-1/2" (38.10) OD. ±.010" (.254) for bearings over 1-1/2" (38.10) OD.
	Thickness	±.010 (.254).

GEARS

Outside diameter.........  .003" (.076), +.001" (.025) per inches diameter

Root diameter............  .003" (.076), +.001" (.025) per inches diameter

Measurement over wires...  .002" (.051), +.001" (.025) per inches diameter

Taper over wires.........  .002" (.051) per inch length

Involute profile

10 to 64 pitch...........  .001" (.025)

Tooth to tooth error

0 to 20 teeth............  .0014" (.036)

20 or more...............  .0010" (.025)


Concentricity of ID to teeth

Up to 2" (50.80) pitch diameter......... .003 (.076) TIR

2" (50.80) to 4" (101.60)

pitch diameter.......................... .004 (.102) TIR

to 4" (101.60) pitch diameter........... .005 (.127) TIR