DIN 125A / ISO 7089 / GB/T 97.1 Flat Washers

FULLERKREG DIN 125A flat washers (equivalent to ISO 7089 and GB/T 97.1) are available across a comprehensive range of materials, hardness grades, and surface finishes — from general-purpose mild steel to marine-grade stainless, hardened high-strength grades, and non-magnetic brass. Select your material and surface finish below.

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Stainless Steel

DIN 125A — A2 Stainless Steel (SUS304), Whitened & Passivated Material: A2 / SUS304  |  Hardness: ≤ 200 HV  |  Surface: Whitened & Passivated  |  Size: M3–M36

DIN 125A — A4 Marine Stainless Steel (SUS316), Whitened & Passivated Material: A4 / SUS316  |  Hardness: ≤ 200 HV  |  Surface: Whitened & Passivated  |  Size: M3–M36

Brass

DIN 125A — Brass H59, Natural Finish Material: Brass H59 (Cu 57–60%)  |  Non-magnetic  |  Surface: Natural (Bright)  |  Size: M3–M20

Carbon Steel — General Purpose (140HV)

DIN 125A — 140HV Carbon Steel Q235, Zinc CR3 (RoHS) Material: Q235  |  Hardness: ~140 HV  |  Surface: Zinc CR3  |  Salt Spray: ≥240h  |  Size: M3–M36

DIN 125A — 140HV Carbon Steel Q235, Black Oxide Material: Q235  |  Hardness: ~140 HV  |  Surface: Black Oxide  |  Size: M3–M36

DIN 125A — 140HV Carbon Steel Q235, Hot Dip Galvanised (HDG) Material: Q235  |  Hardness: ~140 HV  |  Surface: HDG 45–85μm (ISO 10684)  |  Service Life: 20–50+ yr  |  Size: M6–M36

Carbon Steel — Hardened (300HV) — For Grade 8.8 / 10.9 / 12.9 Bolts

DIN 125A — 300HV Hardened Carbon Steel 45#, Zinc CR3 (RoHS) Material: Carbon Steel 45#  |  Hardness: 300–370 HV (Q&T)  |  Surface: Zinc CR3  |  Salt Spray: ≥240h  |  Size: M5–M36

DIN 125A — 300HV Hardened Carbon Steel 45#, Black Oxide Material: Carbon Steel 45#  |  Hardness: 300–370 HV (Q&T)  |  Surface: Black Oxide  |  Size: M5–M36

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Quick Selection Guide

Material	Hardness	Surface	Bolt Grade	Best For
A2 / SUS304	≤ 200 HV	Whitened & Passivated	A2-70 stainless	General outdoor, food-grade, mild corrosive
A4 / SUS316	≤ 200 HV	Whitened & Passivated	A4-70/80 stainless	Marine, offshore, chemical, high-chloride
Brass H59	~120–150 HV	Natural (Bright)	Brass / stainless	Electrical, plumbing, non-magnetic, decorative
Q235 Carbon Steel	~140 HV	Zinc CR3	4.6 / 4.8 / 6.8	General construction, automotive, outdoor
Q235 Carbon Steel	~140 HV	Black Oxide	4.6 / 4.8 / 6.8	Indoor machinery, oil-wetted environments
Q235 Carbon Steel	~140 HV	HDG 45–85μm	4.6 / 4.8 / 6.8	Long-term outdoor structural, civil engineering
Carbon Steel 45#	300–370 HV	Zinc CR3	8.8 / 10.9 / 12.9	High-strength structural, automotive, outdoor
Carbon Steel 45#	300–370 HV	Black Oxide	8.8 / 10.9 / 12.9	High-strength indoor machinery, precision equipment

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