Product Description
DIN 440-R round flat washer, 5.5 x 18 x 2 mm, Article number 440RA4055. Made in stainless steel a4. Round Flat Washer manufactured to DIN 440-R. 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. Applications: load distribution and locking under bolt heads and nuts in machine building, structural steel, plant maintenance and marine outfitting.
Technical Specifications
- Standard
- DIN 440-R
- Standard description
- R
- Property class / grade
- A4
- Class (detailed)
- A4
- Material hardness
- HV100
- Surface treatment
- Plain (no plating)
- Surface treatment code
- PLAIN
- Diameter
- 5 mm
- Inner diameter
- 5.5 mm
- Outer diameter
- 18 mm
- Thickness
- 2 mm
- Article number
- 440RA4055
- Category
- Washers / Plain Washers
Standards & Compliance
- Standard
- DIN 440-R
- Size / Series
- 5.5 x 18 x 2 mm
- Material
- Stainless A4
- HS Code
- 731822
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 440RA4055?
- 440RA4055 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 440RA4055.
- What is the HS code for 440RA4055?
- The customs tariff (HS) code for 440RA4055 is 731822.
- Who manufactures 440RA4055?
- 440RA4055 is a Bufab product in the C-Parts range.
- Is a datasheet available for 440RA4055?
- Yes — the 440RA4055 datasheet can be viewed and downloaded on this page.
- What is the minimum order quantity for 440RA4055?
- The minimum order quantity is 1.
- Is 440RA4055 available?
- Yes — 440RA4055 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).