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Slotted Castle Nut
Find the spanner that fits it snugly, then measure the hole. Our nut identification chart lists every metric and imperial nut we stock side by side, sorted by spanner size.
The fastest check is the male thread: the right nut spins onto its bolt by hand with no force. Identify the bolt size and pitch first with our bolt and screw guide, and the nut follows.
MATERIALS AND FINISHES
Available finishes: Zinc Silver Plated.
GRADES, SIZES AND THREADS
Grades stocked: Low Tensile Class 5.
Sizes: M8 (8mm), M10 (10mm), M12 (12mm), M16 (16mm), M20 (20mm), M24 (24mm).
Thread systems: Metric - Fine.
STANDARDS
DIN 935.
These slotted castle nuts pair with our bolts, washers and threaded rod. See our Technical Resources page for tightening torques and spec PDFs.
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 product.
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In stock
M8 x 1.00p Metric Fine Zinc Class 5 Hex Slotted Castle Nuts Low Tensile DIN 935As low as $0.281 each -
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M10 x 1.25p Metric Fine Zinc Class 5 Hex Slotted Castle Nuts Low Tensile DIN 935As low as $0.298 each -
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M12 x 1.50p Metric Fine Zinc Class 5 Hex Slotted Castle Nuts Low Tensile DIN 935As low as $0.298 each -
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In stock
M16 x 1.50p Metric Fine Zinc Class 5 Hex Slotted Castle Nuts Low Tensile DIN 935As low as $0.425 each -
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In stock
M20 x 1.50p Metric Fine Zinc Class 5 Hex Slotted Castle Nuts Low Tensile DIN 935As low as $1.020 each -
Free shipping
In stock
M24 x 2.00p Metric Fine Zinc Class 5 Hex Slotted Castle Nuts Low Tensile DIN 935As low as $1.275 each
Hex slotted (castle) nuts have six large slots around the top of the hex 60° apart on each flat. The slots accept a split pin (cotter) through a cross-drilled hole in the bolt or shaft, providing a positive mechanical lock that physically prevents the nut backing off — used in axle, wheel, suspension and aviation work. We stock 6+ variants across the slotted castle nut range.
TECHNICAL RESOURCES
Need help identifying your nut? See our guide to identifying the size of your nut.
Key charts and specification sheets: Imperial vs Metric Strength Chart · Specs - Slotted Castle Nut Metric Fine Zinc Silver DIN935
For full sizing data and standards, see our Technical PDFs library.
