M20 Castle Nuts (DIN 935) - Marine Stainless Steel (A4)


Key Features

  • M20 Metric Thread Size (20mm)
  • A4 Stainless Steel, also known as marine grade or 316 Stainless Steel. Details.
  • Thread Size (T): M20 (20mm)
  • Nut Width A/F (F): 30mm
  • Nut Thickness (T): 16mm
View Full Technical Specification.

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M20 Castle Nuts (DIN 935) - Marine Stainless Steel (A4) Technical Specification

M20 Castle Nuts (DIN 935) - Marine Stainless Steel (A4) Drawing
Castellation Width (D)28mm
Manufacturing StandardDIN 935
MaterialMarine Stainless Steel (A4)
Material SpecificationMarine Stainless Steel (A4)
Metric or Imperial?Metric
Nut Thickness (T)16mm
Nut Width A/F (F)30mm
Slot Width (A)4.5mm
Thread Size (T)M20 (20mm)
Total Length (L)22mm

Product Certifications

Certificate of Conformity Included
Certificate of Conformity Included
RoHS Certified
RoHS Certified
REACH Certified
REACH Certified
Quality Approved

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M20 Castle Nuts (DIN 935) - Marine Stainless Steel (A4) Description

The M20 Castle Nuts (DIN 935) - Marine Stainless Steel (A4) has the following features:

  • M20 (20mm) Thread Size (T)
  • DIN 935 Manufacturing Standard
  • 4.5mm Slot Width (A)
  • 30mm Nut Width A/F (F)
  • Marine Stainless Steel (A4) Material
  • Marine Stainless Steel (A4) Material Specification
  • 2.5mm Pitch
  • Natural Finish
  • 22mm Total Length (L)
  • 28mm Castellation Width (D)
  • Metric Metric or Imperial?
  • 16mm Nut Thickness (T)

Discover more about the Castle Nuts range

Castle Nuts feature a castellated top, which allows them to be used in unison with a horizontal locking pin. The pin is inserted between the slots on the nut, through a hole in the screw, to create a locked anti-vibration fastening.


Components within this range are manufactured from A2 and A4 Stainless Steel as standard, with specialist PX-3 Chemical Black Coatings available on request.

Metric Castle Nuts

Castle Nuts are manufactured according to the DIN standard 935, and are available in diameters of between M5 and M36. Widths range from 8.00mm to 55.00mm (A/F), and lengths are available from 6.00mm up to 38.00mm.

Shipping Information

Shipping Destinations:Worldwide.
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Weight Band (100 items):Over 5kg. Add to cart to calculate exact weights.

Component History

Product First Available:Sunday, June 28, 2015
Stock Last Updated:07:58 am
Wednesday, August 4, 2021
Specification Last Updated:Wednesday, August 4, 2021

APC / Barcodes

APC (Accu Product Code):HCTN-M20-A4
EAN13 (International Article No.):5054328317581
ASIN (Amazon Stock Identification No.):ASIN not defined.