Product Description
DIN 981 slotted round lock nut, M20 x 1, Article number 981A4020100. Made in stainless steel a4. Slotted Round Lock Nut manufactured to DIN 981 with ISO metric (M) thread, fine pitch, fully threaded. Standard parts to the same standard, property class, dimensions and surface finish are interchangeable between manufacturers; confirm the controlling standard revision, any class-society or application approval, and the mating thread before substitution.
Technical Specifications
- Standard
- DIN 981
- Property class / grade
- A4
- Class (detailed)
- A4
- Thread type
- M
- Thread diameter
- 20 mm
- Pitch
- 1 mm
- Thread pitch class
- Fine
- Thread direction
- Right
- Threading
- Fully Threaded
- Key width (across flats)
- 4 mm
- Key depth
- 2 mm
- Surface treatment
- Plain (no plating)
- Surface treatment code
- PLAIN
- Lock Nut Symbol
- KM4
- Nut height
- 6 mm
- Nut Inner Diameter
- 26 mm
- Nut Outer Diameter
- 32 mm
- Thread standard
- ISO metric (M)
- Article number
- 981A4020100
- Category
- Nuts / Lock Nuts
Standards & Compliance
- Standard
- DIN 981
- Size / Series
- M20 x 1
- Material
- Stainless A4
- Thread Standard
- ISO metric (M)
- HS Code
- 731816
Product Documentation
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Technical guides
Catalogue entry last verified: 2026-09-30. A manufacturer datasheet is attached to this entry — confirm application-critical values against it.
Frequently asked questions
- Where can I buy 981A4020100?
- 981A4020100 can be ordered from cballast.com as a Bufab 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 Bufab product?
- The manufacturer part number is 981A4020100.
- What is the HS code for 981A4020100?
- The customs tariff (HS) code for 981A4020100 is 731816.
- Who manufactures 981A4020100?
- 981A4020100 is a Bufab product in the C-Parts range.
- Is a datasheet available for 981A4020100?
- Yes — the 981A4020100 datasheet can be viewed and downloaded on this page.
- What is the minimum order quantity for 981A4020100?
- The minimum order quantity is 1.
- Is 981A4020100 available?
- Yes — 981A4020100 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).