FAQ - How to?

How do I measure a Bearing?

No vernier caliper? No Problem a ruler will do the job however it is recommended to use a digital callipers as they provide the most accurate results.

Remember most bearings sizes are full mm or inch sizes. eg: 9.53mm would be 3/8 inch.

If you measured at 9.5mm its probably an inch sized bearing.

To measure the bore of a bearing you can use a vernier caliper like the one shown. Insert the outer anvils of the caliper into the bore as shown and open the caliper until the bearing and caliper are a good fit about each other. Now read the value on the caliper. In the absence of a caliper a good quality steel ruler will suffice.

To measure the outside diameter of a bearing place the jaws of the caliper around the bearing and close it until its a good fit but not tight, now read the value from the caliper.

How to measure a Tab Washer?

No vernier caliper? No Problem a ruler will do the job.

If you measured at 50mm the size is 50 divided by 5, this gives us an MB10 tab washer, 30mm would give us an MB6 (30/5=6).

To measure a tab washer simply measure it's bore and then divide the measurement by 5.

eg: 50mm divided by 5 = 10 so the size is MB10

How to measure a Lock Nut?

No vernier caliper? No Problem a ruler will do the job.

If you measured at 50mm the size is 50 divided by 5, this gives us an 10 sized lock nut , 30mm would give us an 6 sized lock nut (30/5=6).

To measure a lock nut simply measure it's bore and then divide the measurement by 5.

eg: 50mm divided by 5 = 10 so the size is a 10 sized nut eg: MB10, KMFE 10 etc

Conversion Tables between imperial and metric systems

1mm = 0.039 inches
25.4mm = 1 inch