M20 Hexagon Nylon Locking Nuts (DIN 985) - 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: M20 (20mm)
  • Nut Width A/F (J) [Max]: 30mm
  • Total Thickness (L) [Max]: 20mm
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M20 Hexagon Nylon Locking Nuts (DIN 985) - Marine Stainless Steel (A4) Technical Specification

M20 Hexagon Nylon Locking Nuts (DIN 985) - Marine Stainless Steel (A4) Drawing
General Tolerance+/- 0.13mm
Hexagon Height (T) [Min]14mm
Insert MaterialNylon
Manufacturing StandardDIN 985
MaterialMarine Stainless Steel (A4)
Material SpecificationMarine Stainless Steel (A4)
Metric or Imperial?Metric
Nut Width A/F (J) [Max]30mm
Nut Width A/F Tolerance+0mm/-0.84mm
Screw Thread Pitch2.50mm
Thread SizeM20 (20mm)
Total Thickness (L) [Max]20mm
Total Thickness (L) Tolerance+0mm/-1.3mm

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 Hexagon Nylon Locking Nuts (DIN 985) - Marine Stainless Steel (A4) Description

The M20 Hexagon Nylon Locking Nuts (DIN 985) - Marine Stainless Steel (A4) has the following features:

  • DIN 985 Manufacturing Standard
  • Nylon Insert Material
  • Marine Stainless Steel (A4) Material
  • Marine Stainless Steel (A4) Material Specification
  • 2.50mm Screw Thread Pitch
  • Natural Finish
  • +/- 0.13mm General Tolerance
  • Metric Metric or Imperial?
  • M20 (20mm) Thread Size
  • 20mm Total Thickness (L) [Max]
  • 30mm Nut Width A/F (J) [Max]
  • 14mm Hexagon Height (T) [Min]
  • +0mm/-0.84mm Nut Width A/F Tolerance
  • +0mm/-1.3mm Total Thickness (L) Tolerance

Discover more about the Hexagon Nylon Locking Nuts range

Nylon Locking Nuts (also called Nyloc Nuts or Nylocks) are a type of self locking nut, fitted with a polymer insert. The elastic Nylon insert of this component fits tightly against the fastener, and is designed to resist loosening.

Nylon Lock Nut Variants 

High Nylon Locking Nuts are an elongated variant of this component, which allow for greater thread contact and more secure fastenings.

For applications in high temperature environments, or where an all-metal locking nut is preferred, Metal Locking Nuts are also available. For a premium metal locking nut solution, please see Accu's Aerotight Locking Nuts range.

Our range of Flanged Nylon Locking Nuts and Serrated Nylon Locking Nuts are also available for applications requiring greater distribution of load pressure without the need for a separate washer.


The metal section of a Nylon Locking Nut can be manufactured from A2 and A4 (Marine Grade) Stainless Steel as well as Grade 8 and Grade 10 Carbon Steel. Hot Dip Galvanised and Zinc Plated finishes are available on the Carbon Steel Nylocs, with these treatments helping to offer improved corrosion resistance.

Metric Nylon Locking Nuts

Metric Nylon Locking Nuts are manufactured according to DIN 985, and are available in metric sizes of between M1.6 and M48.

For imperial options, please see our Imperial Nylon Locking Nuts.

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:10:28 am
Friday, September 24, 2021
Specification Last Updated:Friday, September 24, 2021

APC / Barcodes

APC (Accu Product Code):HNN-M20-A4
EAN13 (International Article No.):5054328032620
ASIN (Amazon Stock Identification No.):ASIN not defined.