SKF MB31 Bearing lock nut (keyway type)
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Product Description
SKF MB31 bearing lock nut (keyway type). Bearing lock nut in the KM series with axial keyway that engages an MB lock washer. Locks a bearing, adapter sleeve or withdrawal sleeve axially on a shaft. Thread size and boundary dimensions per ISO 2982-1 / DIN 981. Nut always paired with the matching MB washer of the same numeric designation.
Technical Specifications
- Type
- Bearing lock nut (keyway type)
- Designation
- SKF MB31
- HS code
- 8483.30
- Bore diameter
- 155 mm
- Outside diameter
- 212 mm
- Locking device
- Lock washer
- Product net weight
- 0.233 kg
- eClass code
- 23-11-07-05
- UNSPSC code
- 31163218
Standards & Compliance
- Standard
- SKF designation convention (see description for governing ISO / DIN)
- Material
- As declared by SKF designation suffix
- Temperature Range
- Per SKF product data
- HS Code
- 8483.30
Compatibility & Fitment
Interchange with peer OEM equivalents on identical boundary plan and execution — confirm cage, clearance, sealing and precision-class suffix before substitution.
Product Documentation
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Technical guides
Catalogue entry last verified: 2026-08-13. A manufacturer datasheet is attached to this entry — confirm application-critical values against it.
Frequently asked questions
- Where can I buy MB31?
- MB31 can be ordered from cballast.com as a SKF catalogue item: request a quotation on this page or email sales@cballast.com, and the order ships worldwide.
- What is the manufacturer part number for this SKF product?
- The manufacturer part number is MB31.
- What is the HS code for MB31?
- The customs tariff (HS) code for MB31 is 8483.30.
- Who manufactures MB31?
- MB31 is a SKF product in the Bearings & Power Transmission range.
- Is a datasheet available for MB31?
- Yes — the MB31 datasheet can be viewed and downloaded on this page.
- What is the minimum order quantity for MB31?
- The minimum order quantity is 1.
- Is MB31 available?
- Yes — MB31 is available to order: fulfilment is from supplier stock in cBallast's European network, dispatched directly from the warehouse to the customer, with the exact lead time stated in the quotation (reply within 24 hours).