M20 Flat Washers (DIN 9021) - Black Duplex Stainless Steel


Key Features

  • M20 Metric Thread Size (20mm)
  • For Use With Thread Size: M20 (20mm)
  • External Diameter (OD): 60mm
  • Thickness (T): 4mm
  • Material: Duplex Stainless Steel
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M20 Flat Washers (DIN 9021) - Black Duplex Stainless Steel Technical Specification

M20 Flat Washers (DIN 9021) - Black Duplex Stainless Steel Drawing
External Diameter (D) Tolerance+1.9/-0mm
External Diameter (OD)60mm
FinishMatte Black
For Use With Thread SizeM20 (20mm)
Internal Diameter (B) Tolerance+0.52/-0mm
Internal Diameter (ID)22mm
Manufacturing StandardDIN 9021
MaterialDuplex Stainless Steel
Material Specification1.4462 Duplex Stainless Steel
Metric or Imperial?Metric
Thickness (T)4mm
Thickness (T) Tolerance+1.2/-0mm

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 Flat Washers (DIN 9021) - Black Duplex Stainless Steel Description

The M20 Flat Washers (DIN 9021) - Black Duplex Stainless Steel has the following features:

  • DIN 9021 Manufacturing Standard
  • 22mm Internal Diameter (ID)
  • 60mm External Diameter (OD)
  • 4mm Thickness (T)
  • Duplex Stainless Steel Material
  • 1.4462 Duplex Stainless Steel Material Specification
  • Matte Black Finish
  • Metric Metric or Imperial?
  • +0.52/-0mm Internal Diameter (B) Tolerance
  • +1.9/-0mm External Diameter (D) Tolerance
  • +1.2/-0mm Thickness (T) Tolerance
  • M20 (20mm) For Use With Thread Size

Discover more about the Metric Flat Washers range

Flat Washers, one of Accu's Washer & Spacer range, are designed primarily to enhance the load-bearing capabilities of a threaded fastener, and are compatible with a wide range of Precision Screws. Flat Washers are versatile components with a variety of uses, including spacing, pre-load indication, and wear-protection.

Flat Washers are available in several variants with varying diameters and thicknesses. The most commonly used washers are forms A, B and C, with more specialised variants such as Penny Washers also available. Flat washer variants range from those with small external diameters and thicknesses, to very large washers with large external diameters.

Where a flat surface is not required, components such as Countersunk Washers or Spring Washers may be preferable.


Accu's standard range of Flat Washers is manufactured from A2, A4 and Bumax Stainless Steel, with Chemical Matte Blackening available. All Stainless Steel Washers are resistant to tarnishing and corrosion, but A4 Stainless Steel is specifically designed for use in marine environments.

Flat Washers can also be manufactured from a variety of specialist materials, including Aluminium, Brass, Phosphor Bronze, Nylon, PEEK, Polycetal and Titanium. Fibre and Rubber Flat Washers are intended to be pliable for sealing purposes.

Metric Flat Washers

Metric Flat Washers are available in sizes ranging from M1 to M56. This category includes only metric flat washers – Imperial Flat Washers in imperial sizes are available separately.

Shipping Information

Shipping Destinations:Worldwide.
View delivery information.
Weight: Not defined.

Component History

Product First Available:Wednesday, October 31, 2018
Stock Last Updated:03:48 am
Thursday, December 2, 2021
Specification Last Updated:Thursday, December 2, 2021

APC / Barcodes

APC (Accu Product Code):HPW-M20-V2-DX-BL
EAN13 (International Article No.):5057196200443
ASIN (Amazon Stock Identification No.):ASIN not defined.