Internal Clearance for Radial Ball Bearings

GMN Bearing USA’s ABEC 7 high precision ball bearings are made for high speed and heavy load applications.

GMN angular contact bearings (spindle bearings) are expertly crafted for speed, precision, & accuracy.

GMN radial ball bearings are versatile, great in small spaces & when axial loads move in both directions.

We know that not every application requires super, high-precision bearings. We stock other industrial parts from quality brands.

Our one-way sprag clutches are great for applications with low to high torque capacity.

Includes built-in ball bearing support. Supports HEAVY loads & has a high torque capacity: 53 to 588 Nm. Bore (ID) sizes: 10 to 60 mm (0.393 to 2.362 in)

Includes built-in ball bearing support. Supports MEDIUM loads & low to medium torque capacity: 53 to 267 Nm. Bore (ID) sizes: 17 to 40 mm (0.669 to 1.57 in)

No built-in ball bearing support. Good for large orders & low to high torque needs: 1 to 2673 Nm. Bore (ID) sizes: 2 to 240 mm (0.078 to 9.448 in)

No built-in ball bearing support. Has no RPM limits & Supports high torque needs: 609 to 14,060 Nm. Bore (ID) sizes: 38.09 to 220 mm (1.499 to 8.66 in)

This heavy-duty clutch (aka a hold-back clutch) is good for high torque operations and ensures motion freezes in place. Bore (ID) sizes: 15 to 40 mm. (0.59 to 1.73 in)

Designed for HEAVY-DUTY applications that require tough durability.

Our non-contact labyrinth seals are the first line of protection for bearing systems.

The best protection for your bearing. Easy to install with a simple “drop-in” next to your bearing. No added space needed. CF seals offer 100% sealing efficiency against splashing liquids.

Protection against low contamination & splashing liquids.

Designed with grooves in the outer ring to offer more protection (than our L-type seal) against contamination and direct spray liquids. Liquid gets pushed out through outer grooves when in rotation.

Our GMN Gap Seals are plastic and a great choice for washdown applications, such as food conveyors and food manufacturing facilities

Tolerances for Radial Ball Bearings, include (but are not limited to) dimensional and running accuracy and are regulated by standards such as DIN, ABEC, ISO, and JIS B1514 to ensure manufacturing uniformity.

These standards specify tolerance and permissible dimension values like bore diameter, outside diameter, width, chamfer, taper, and more. They also provide variation limits on bore, mean bore, outside diameter, mean outside diameter, ring width, etc. to establish machining accuracy.

These accuracy measurements are defined as Precision Bearing Runout(s). Runout measurements are what define the rotational accuracy of the bearing.

Bearing runout tolerances are included in the standards for inner and outer ring, radial & axial runout, inner ring side runout with bore and outer ring surface runout with side.

Below are tables outlining the Internal Clearance options and tolerances of those internal clearances for Radial Ball Bearings.

What is Internal Clearance for a Bearing?

Internal Clearance is the amount the balls can move relative to the raceways, when in a free state.

To calculate the internal clearance for a radial ball bearing, you need to combine the internal clearance choices with installation clearances (or press fits of mating parts).

These tables below should give you a good idea on internal clearances for a radial ball bearing. But feel free to contact us for any questions you may have.

Standard Bearing Tolerance Classes & Equivalents

Standards Group Name	Tolerance Classes & Equivalents
Annular Bearings Engineers Committee (ABEC)	ABEC 1	ABEC 3	ABEC 5 (Class 5P)	ABEC 7 (Class 7P)	ABEC 9 (Class 9P)
International Organization for Standardization (ISO 492)	Class Normal	Class 6	Class 5	Class 4	Class 2
Deutsche Industrie Norm (DIN)	P 0	P 6	P 5	P 4	P 2
Japanese Industrial Standards (JIS)	Class 0	Class 6	Class 5	Class 4	Class 2

Nominal Bore Diameter (d) (mm)		Clearance
		C2	Normal	C3	C4	C5
over	incl	min - max	min - max	min - max	min - max	min - max
10 only	-	0-7	2-13	8-23	14-29	20-37
10	18	0-9	3-18	11-25	18-33	25-45
18	24	0-10	5-20	13-28	20-36	28-48
24	30	1-11	5-20	13-28	23-41	30-53
30	40	1-11	6-20	15-33	28-46	40-64
40	50	1-11	6-23	18-36	30-51	45-73

Clearances for Small & Miniature Bearings

Clearance Mark	MC1	MC2	MC3	MC4	MC5	MC6
Clearance	min - max	min - max	min - max	min - max	min - max	min - max
Clearance	0-5	3-8	5-10	8-13	13-20	20-28

Units: µm

Clearances for Electric Motors

Nominal Bore Dia. d (mm)	Clearance CM
over-incl	min - max
10 (inch) -18	4-11
18-30	5-12
30-50	9-17

Please contact one of our onsite engineers if you have any questions or need help calculating your radial ball bearing clearance and tolerance.