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Conical Spring Washers
Washers are named by the bolt they fit: an M10 washer suits an M10 bolt. The inside diameter is slightly larger than the bolt so it slides on. Our guide covers every size and washer type we stock.
Measure the inside diameter (ID), outside diameter (OD) and thickness, as shown in the drawing.
MATERIAL
A2-70 G304 Stainless Steel — General outdoor, food contact and most chemical environments.
KEY ADVANTAGES
Combine the spring action of a Belleville washer with the locking bite of a serrated tooth washer. Suitable for joints subject to vibration where a standard spring washer would be marginal but a Schnorr® or Nord-Lock® may be over-spec. Single-piece — no aligned pair to install.
STANDARD
Conforms to French standard NF E 25-511 Form M.
WHY AUSTRALIA TRUSTS BOLT & NUT
With 15+ years selling fasteners online from Brisbane, we hold over 25,000 stock lines and 200 million pieces — 98.75% of online orders placed before 1pm leave same day. Save more as you buy more — we offer up to 13 price breaks plus 3 spend-tier discounts. Read our customer reviews or get in touch if you need help picking the right conical spring washer.
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M3 (1/8") x 8mm x 0.6mm Stainless A2-70 G304 Serrated Conical Spring Washer NF E 25-511As low as $0.170 each -
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M6 (1/4") x 14mm x 1.3mm Stainless A2-70 G304 Serrated Conical Spring Washer NF E 25-511As low as $0.221 each -
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M10 x 22mm x 1.6mm Stainless A2-70 G304 Serrated Conical Spring Washer NF E 25-511As low as $0.595 each -
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M20 x 40mm x 3.2mm Stainless A2-70 G304 Serrated Conical Spring Washer NF E 25-511As low as $1.360 each
Serrated conical safety washers (Form M) have radial serrations on the convex surface. As the fastener is tightened, final flattening of the washer drives the serrations into the mating face — preventing loosening from vibration. They function much like a serrated flange nut, but as a separate washer that can be added to a standard fastener.
TECHNICAL RESOURCES
Need help identifying your washer? See our washer measuring guide, or check the washer gauge sizing chart.
Key charts and specification sheets: Specs - Serrated Conical Spring Washers Metric Stainless G304 NF E 25-511 · Metric to Imperial Chart
For full sizing data and standards, see our Technical PDFs library.
