dimension control
Inner Ring Tolerances | Outer Ring Tolerances | Ring Width Tolerances
For more than thiry years, NHBB has been an active member in the American Bearing Manufacturers Association (ABMA) and its associated ball bearing technical commitee, the Annular Bearing Engineers' Committee (ABEC).
These tolerances are reviewed regularly and updated as required. The ABMA Standards may be obtained by contacting: ABMA, 1101 Connecticut Ave. N.W., Suite 700, Washington, DC 20036.
Inner Ring Tolerances*
| 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 2pt. out of Roundness |
— |
— |
.0001 |
.0001 |
.00005 |
| Bore Taper
Radial Runout
Width Variation |
—
.0004
— |
—
.0002 (1)
— |
.0001
.00015
.0002 |
.0001
.0001
.0001 |
.00005
.00005
.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 Tolerances*
| CHARACTERISTIC |
CONFIGURATION |
SIZE RANGE |
ABEC 1 |
ABEC 3P |
ABEC 5P |
ABEC 7P |
ABEC 9P |
| Mean O.D. Tolerance Limits |
All
|
0-18mm
(0-.7086in) |
+.0000
-.0003 |
+.0000
-.0003 |
+.0000
-.0002 |
+.0000
-.0002 |
+.0000
-.0001 |
| All |
over 18-30mm
(.7086-1.1181in) |
+.0000
-.0004 |
+.0000
-.0003 |
+.0000
-.0002 |
+.0000
-.0002 |
+.0000
-.00015 |
| Maximum O.D. Tolerance Limits |
Open |
0-18mm
(0-.7086in.)
over 18-30mm
(.7086-1.1811in) |
+.0001
-.0004
+.0001
-.0005 |
+.0001
-.0004
+.0001
-.0004 |
+.0000
-.0002
+.0000
-.0002 |
+.0000
-.0002
+.0000
-.0002 |
+.0000
-.0001
+.0000
-.00015 |
| Shielded |
0-18mm
(0-.7086in.)
over 18-30mm
(.7086-1.1811in) |
+.0002
-.0005
+.0002
-.0006 |
+.0002
-.0005
+.0002
-.0005 |
+.00004
-.00024
+.00004
-.00024 |
+.00004
-.00024
+.00004
-.00024 |
—
— |
O.D. 2 pt. out of Roundness |
Open
Open
Shielded |
0-18mm
over 18-30mm
0-30mm |
—
—
— |
—
—
— |
.0001
.0001
.0002 |
.0001
.0001
.0002 |
.00005
.00008
— |
| O.D. Taper |
All
All
Shielded |
0-18mm
over 18-30mm
0-30mm |
—
—
— |
—
—
— |
.0001
.0001
.0002 |
.0001
.0001
.0002 |
.0005
.0008
— |
Radial Runout
Width Variation
O.D. 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
-.0020 |
+.0000
-.0020 |
+.0000
-.0020 |
—
— |
|
—
— |
—
— |
+.0050
-.0020 |
+.0000
-.0010 |
+.0000
-.0010 |
—
— |
*Measurement in inches, unless otherwise indicated.
Ring Width Tolerances*
| CHARACTERISTIC |
CONFIGURATION |
ABEC 1 |
ABEC 3P |
ABEC 5P |
ABEC 7P |
ABEC 9P |
| Width |
Single Bearing |
+.000
-.005 |
+.000
-.005 |
+.000
-.001 |
+.000
-.001 |
+.000
-.001 |
| Duplex Pair |
—
— |
—
— |
+.000
-.015 |
+.000
-.015 |
+.000
-.015 |
*Measurement in inches, unless otherwise indicated.
|
