Deep Groove Ball Bearing ABEC Ratings by ABT

Precision Engineered Bearings

ABEC Ratings for ABT Radial Ball Bearings

Precision ball bearings are rated according to ABEC (Annular Bearing Engineers Committee) grades. The higher the ABEC grade, the better the bearing. Tolerances are the major differentiating factor between ABEC grades (e.g. ABEC-5 ball bearings have tighter tolerances than ABEC-1).

Inner Ring ABEC Tolerances

Characteristics	ABEC 1	ABEC 3	ABEC 5	ABEC 7	ABEC 9

Bore Tolerance Limits	+.0000 −.0003	+.0000 −.0002	+.0000 −.0002	+.0000 −.0002	+.0000 −.0001
Bore Taper Radial Runout Width Variation	— .0003 * —	— .0002 * —	.0001 .00015 .0002	.0001 .0001 .0001	.00005 .00005 .00005
Bore Runout with Face	—	—	.0003	.0001	0.0005
Race Runout with Face	—	—	.0003	.0001	0.0005
* Add .0001 to the tolerance if bore size is over 10mm (.3937 inch).

Outer Ring ABEC Tolerances

Characteristics	Config.	Size Range	ABEC 1	ABEC 3	ABEC 5	ABEC 7	ABEC 9

Mean OD Tolerance Limits	All	0-18 mm (−.709)	+.0000 −.0003	+.0000 −.0003	+.0000 −.0002	+.0000 −.0002	+.0000 −.0001
Mean OD Tolerance Limits	All	over 18-30mm (.709-1.1811)	+.0000 −.0004	+.0000 −.0003	+.0000 −.0002	+.0000 −.0002	+.0000 −.00015
Maximum OD Tolerance Limits	Open	0-18mm (0-.709) over 18-30mm (.709-1.1811)	+.0001 −.0004 +.0001 −.0005	+.0001 −.0004 +.0001 −.0004	+.0000 −.0002 +.0000 −.0002	+.0000 −.0002 +.0000 −.0002	+.0000 −.0001 +.0000 −.00015
Maximum OD Tolerance Limits	Shielded	0-18mm (0-.709) over 18-30mm (.709-1.1811)	+.0002 −.0005 +.0002 −.0006	+.0002 −.0005 +.0002 −.0005	+.00004 −.00024 +.00004 −.00024	+.00004 −.00024 +.00004 −.00024	— —
OD 2 PT. Out of Roundness	Open Open Shielded	0-18mm over 18-30mm 0-30mm	— — —	— — —	.0001 .0001 .0002	.0001 .0001 .0002	.00005 .00008 —
OD Taper	All All Shielded	0-18mm over 18-30mm 0-30mm	— — —	— — —	.0001 .0001 .0002	.0001 .0001 .0002	.00005 .00008 —
Radial Runout Width Variation OD Runout with Face Race Runout with Face	All All All All Plain Plain Flanged	0-18mm over 18-30mm 0-30mm 0-30mm 0-18mm over 18-30mm 0-30mm	.0006 .0006 — — — — —	.0004 .0004 — — — — —	.0002 .0002 .0002 .0003 .0003 .0003 .0003	.00015 .00015 .0001 .00015 .0002 .0002 .0003	.00005 .0001 .00005 .00005 .00005 .0001 —
Flange Width Tolerance Limits Flange Diameter Tolerance Limits		— —	— —	+.0000 −0.002	+.0000 −.0020	+.0000 −.0020	— —
		— —	— —	+.0050 −.0020	+.0000 −.0010	+.0000 −.0010	— —

Ring Width ABEC Tolerances

Characteristics	Configuration	ABEC 1	ABEC 3	ABEC 5	ABEC 7	ABEC 9

Width Tolerance	Single Bearing	+.000 −.005	+.000 −.005	+.000 −.001	+.000 −.001	+.000 −.001
Width Tolerance	Duplex Pair	— —	— —	+.000 −.015	+.000 −.015	+.000 −.015