DIN 9021 Fender Washers (Large OD)

FULLERKREG DIN 9021 fender washers feature an outer diameter of approximately 3× the bolt nominal diameter — significantly larger than standard DIN 125A washers — providing a much greater bearing area to prevent bolt pull-through and embedment in soft or thin materials such as timber, plywood, plastic, thin sheet metal, and composite panels. Available in stainless steel and carbon steel with multiple surface finishes for all environments. Select your material and surface finish below.

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Product Gallery

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Stainless Steel

DIN 9021 — A2 Stainless Steel (SUS304), Whitened & Passivated Material: A2 / SUS304  |  Surface: Whitened & Passivated  |  Size: M5–M24  |  OD: ~3× bolt dia.

DIN 9021 — A4 Marine Stainless Steel (SUS316), Whitened & Passivated Material: A4 / SUS316  |  PREN ~24–26  |  Surface: Whitened & Passivated  |  Size: M5–M24  |  For marine, coastal & treated timber

Carbon Steel — Zinc CR3 (RoHS)

DIN 9021 — Low Carbon Steel, Zinc CR3 (RoHS) Material: Low Carbon Steel  |  Surface: Zinc CR3  |  Salt Spray: ≥240h  |  Size: M5–M24  |  General outdoor use

Carbon Steel — Hot Dip Galvanised (HDG)

DIN 9021 — Low Carbon Steel, Hot Dip Galvanised (HDG) Material: Low Carbon Steel  |  Surface: HDG 45–85μm (ISO 10684)  |  Salt Spray: ≥1000h  |  Service Life: 20–50+ yr  |  Size: M6–M24

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DIN 9021 vs DIN 125A — When to Use a Large OD Washer

Property	DIN 9021 (Large OD)	DIN 125A (Standard OD)
Outer diameter ratio	~3× bolt diameter	~2× bolt diameter
M12 outer diameter	37 mm	24 mm
Bearing area (M12)	~940 mm²	~320 mm² (~3× smaller)
Pull-through resistance	High — for soft/thin materials	Standard — for hard materials
Best for	Timber, plywood, plastic, thin sheet, composite panels	Steel, concrete, hard structural materials
ISO equivalent	ISO 7093	ISO 7089

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Quick Selection Guide

Material	Surface	Size Range	Outdoor Life	Best For
A2 / SUS304	Whitened & Passivated	M5–M24	20–50+ yr	General outdoor, timber, food-grade, mild corrosive
A4 / SUS316	Whitened & Passivated	M5–M24	20–50+ yr	Marine, coastal, offshore, ACQ/CCA treated timber
Low Carbon Steel	Zinc CR3	M5–M24	3–10 yr	General construction, automotive, short–medium outdoor
Low Carbon Steel	HDG 45–85μm	M6–M24	20–50+ yr	Long-term outdoor structural timber, civil engineering

Can’t find the material, size, or configuration you need? Contact FULLERKREG — additional configurations available on request.