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Tolerances

For more than thirty years, NHBB has been an active member in the American Bearing Manufacturers Association (ABMA) and its associated ball bearing technical committee, the Annular Bearing Engineers’ Committee (ABEC). The ABEC tolerances listed in the attached document are current as of this posting. These tolerances are reviewed regularly and updated as required. The ABMA Standards may be obtained by contacting: ABMA, 2025 M Street, NW, Suite 800, Washington, DC 20036.

Inner Ring*

Characteristic ABEC 1 ABEC 3P ABEC 5P ABEC 7P ABEC 9P
Bore tolerance limits +.0000
–.0003
+.0000
–.0002
+.0000
–.0002
+.0000
–.0002
+.0000
–.0001
Bore 2 pt. out of roundness .0001 .0001 .00005
Bore taper .0001 .0001 .00005
Radial runout .0004 .0002 (1) .00015 .0001 .00005
Width variation .0002 .0001 .00005
Bore runout with face .0003 .0001 .00005
Race runout with face . .0003 .0001 .00005

*Measurement in inches.
(1) Add .0001 to the tolerance if bore size is over 10mm (.3937 inch).

Outer Ring*

CHARACTERISTIC CONFIGURATION SIZE RANGE ABEC 1 ABEC 3P ABEC 5P ABEC 7P ABEC 9P
Mean O.D. tolerance limits All 0-.7086 inch
(0-18 mm)
+.0000
–.0003
+.0000
–.0003
+.0000
–.0002
+.0000
–.0002
+.0000
–.0001
.7086-1.181 inch
(over 18-30 mm)
+.0000
–.0004
+.0000
–.0003
+.0000
–.0002
+.0000
–.0002
+.0000
–.00015
Maximum O.D. tolerance limits Open 0-.7086 inch
(0-18 mm)
+.0001
–.0004
+.0001
–.0004
+.0000
–.0002
+.0000
–.0002
+.0000
–.0001
.7086-1.1811 inch
(over 18-30 mm)
+.0001
–.0005
+.0001
–.0004
+.0000
–.0002
+.0000
–.0002
+.0000
–.00015
Shielded 0-.7086 inch
(0-18 mm)
+.0002
–.0005
+.0002
–.0005
+.00004
–.00024
+.00004
–.00024

.7086-1.1811 inch
(over 18-30 mm)
+.0002
–.0006
+.0002
–.0005
+.00004
–.00024
+.00004
–.00024

O.D. 2 pt. out of roundness Open 0-.7086 in. .0001 .0001 .00005
Open .7086-1.1811 in. .0001 .0001 .00008
Shielded 0-1.1811 in. .0002 .0002
O.D. taper All 0-.7086 in. .0001 .0001 .0005
All .7086-1.1811 in. .0001 .0001 .0008
Shielded 0-1.1811 in. .0002 .0002
Radial runout All 0-.7086 in. .0006 .0004 .0002 .00015 .00005
All .7086-1.1811 in. .0006 .0004 .0002 .00015 .0001
Width variation All 0-1.1811 in. .0002 .0001 .00005
O.D. runout with face All 0-1.1811 in. .0003 .00015 .00005
Race runout with face Plain 0-.7086 in. .0003 .0002 .00005
Plain .7086-1.1811 in. .0003 .0002 .0001
Flanged 0-1.1811 in. .0003 .0003
Flange width tolerance limits


+.0000
–.0020
+.0000
–.0020
+.0000
–.0020

Flange diameter tolerance limits


+.0050
–.0020
+.0000
–.0010
+.0000
–.0010

*Measurement in inches, unless otherwhie indicated.

Ring Width*

CHARACTERISTIC CONFIGURATION ABEC 1 ABEC 3P ABEC 5P ABEC 7P ABEC 9P
Width Single bearing +.000 +.000 +.000 +.000 +.000
–.005 –.005 –.001 –.001 –.001
Duplex pair +.000 +.000 +.000
–.015 –.015 –.015

*Measurement in inches.

ABEC 5T Tolerances*

Bore Diameter
Over Incl.
Radial Runout Mean Diameter Tolerance
Inner Ring 0.35433 1.18110 0.0002 +.0000
-.0002
1.18110 1.77165 0.0003 +.0000
-.0003
1.77165 2.55906 0.0004 +.0000
-.0004
Outside Diameter
Outer Ring 0.55118 1.10236 0.0002
+.0000
-.0002
1.10236 3.14961 0.0003
+.0000
-.0004

*Measurement in inches.

ABEC 7T Tolerances*

Bore Diameter
Over Incl.
Radial Runout Mean Diameter Tolerance
Inner Ring 0.35433 0.70866 0.0001 +.0000
-.0002
0.70866 1.77165 0.00015 +.0000
-.0002
1.77165 2.55906 0.0002 +.0000
-.0003
Outside Diameter
Outer Ring 0.55118 1.10236 0.00015 +.0000
-.0002
1.10236 1.96850 0.0002 +.0000
-.0004
1.96850 2.55906 0.0002 +.0000
-.0003

*Measurement in inches.