69 products
MBA / MBB Series Bearing Lockwashers – Metric
MBA and MBB are the extended metric lockwasher families that sit alongside the standard MB series. MBA is the keybent design, matched to KM, KML and KMM locknuts, and MBB covers the additional bore and outside-diameter combinations needed where a standard MB washer does not fit the housing or the shaft keyway.
MBA / MBB Series Specifications
- Part numbers: MBA-00 through MBA-36; MBB-00 through MBB-48 (69 sizes stocked)
- Bore / shaft size: 10 mm to 200 mm
- Outside diameter: 21 mm to 262 mm
- Material & temperature: Carbon steel, black oxide finish; 300°F maximum operating temperature
- Standards: ISO 2982-2:2013(E); made in USA, RoHS compliant
Applications
Locking metric bearing locknuts where the standard MB washer geometry is wrong for the seat — non-standard keyways, restricted housings and heavier thrust duty.
Related Whittet-Higgins Series
- MB Series Bearing Lockwashers – ISO Metric
- KM Series Bearing Locknuts – ISO Metric
- KML / KMM Series Bearing Locknuts – Metric, Left-Hand & High-Strength
- MBS Series Bearing Lockwashers – Metric, Stainless Steel
Apollo is an authorized Whittet-Higgins distributor. Every part on this page is genuine Whittet-Higgins, manufactured in the USA. Need a size that is not listed, or help matching a locknut to its lockwasher and assembly socket? Contact our team.

