Product Description
DIN 557 square nut, M20, Article number 557201. Property class / material: steel class 5, surface finish zinc plated. Square Nut manufactured to DIN 557 with ISO metric (M) thread, coarse 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 557
- Property class / grade
- CL.5
- Class (detailed)
- CL.5
- Thread type
- M
- Thread diameter
- 20 mm
- Pitch
- 2.5 mm
- Thread pitch class
- Coarse
- Thread direction
- Right
- Threading
- Fully Threaded
- Key width (across flats)
- 30 mm
- Surface treatment
- Zinc Bright Passivation Fe/Zn P1 (ZPL 3+)
- Surface treatment code
- ZPL
- Nut Diameter
- 42.4 mm
- Nut height
- 16 mm
- Thread standard
- ISO metric (M)
- Article number
- 557201
- Category
- Nuts
Standards & Compliance
- Standard
- DIN 557
- Size / Series
- M20
- Material
- Steel class 5
- 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 557201?
- 557201 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 557201.
- What is the HS code for 557201?
- The customs tariff (HS) code for 557201 is 731816.
- Who manufactures 557201?
- 557201 is a Bufab product in the C-Parts range.
- Is a datasheet available for 557201?
- Yes — the 557201 datasheet can be viewed and downloaded on this page.
- What is the minimum order quantity for 557201?
- The minimum order quantity is 1.
- Is 557201 available?
- Yes — 557201 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).