Simfix

M4 Hexagon Full Nut 20 Pack DIN 934 A4 Stainless Steel

SKU 934A40040PK20-SIM
1000+ in stockReady to dispatch
£3.60
Pack size:
Free next-day delivery over £50 Next-day delivery is free when your order is over £50, or £5.50 below that threshold.
Same-day shipping before 4pm Orders placed before 4pm Monday-Friday are typically dispatched the same working day.
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Speedy refunds If something is not right, contact us within 30 days of delivery and we will sort a refund or replacement quickly.

M4 hex nut in A4 marine grade stainless steel to DIN 934. Full-height hexagon form, compatible with all M4 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies, electronics, and light mechanical fittings. Free next-day UK delivery on orders over £50.
£3.60

M4 hex nut in A4 marine grade stainless steel to DIN 934. Full-height hexagon form, compatible with all M4 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies, electronics, and light mechanical fittings. Free next-day UK delivery on orders over £50.
  • M4 hexagon nut marine grade 316 DIN 934
  • DIN 934 hex nut M4 A4 marine grade stainless steel, side view
  • Head-on view - M4 A4 stainless hexagon nut DIN 934
  • Hexagon Full Nut in a real-life marine application. A4 stainless steel for marine and coastal assemblies.
  • Simfix product label - 934A40040PK20-SIM
  • Simfix product label - 934A40040PK100-SIM
M4 hexagon nut marine grade 316 DIN 934
DIN 934 hex nut M4 A4 marine grade stainless steel, side view
Head-on view - M4 A4 stainless hexagon nut DIN 934
Hexagon Full Nut in a real-life marine application. A4 stainless steel for marine and coastal assemblies.
Simfix product label - 934A40040PK20-SIM
Simfix product label - 934A40040PK100-SIM
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M4 hexagon nut marine grade 316 DIN 934 DIN 934 hex nut M4 A4 marine grade stainless steel, side view Head-on view - M4 A4 stainless hexagon nut DIN 934 Hexagon Full Nut in a real-life marine application. A4 stainless steel for marine and coastal assemblies. Simfix product label - 934A40040PK20-SIM Simfix product label - 934A40040PK100-SIM
M4 hexagon nut marine grade 316 DIN 934 DIN 934 hex nut M4 A4 marine grade stainless steel, side view Head-on view - M4 A4 stainless hexagon nut DIN 934 Hexagon Full Nut in a real-life marine application. A4 stainless steel for marine and coastal assemblies. Simfix product label - 934A40040PK20-SIM Simfix product label - 934A40040PK100-SIM

This M4 full hex nut is manufactured to DIN 934 in A4 stainless steel (316 marine grade). DIN 934 (ISO 4032) is the most widely specified general-purpose hex nut standard, with defined width across flats, height, and metric coarse thread tolerance to ensure consistent fit across suppliers. The full-height hex form provides maximum thread engagement and clamping force compared with thin (jam) nuts - suited to joints where full load-bearing capacity is required. Compatible with any M4 bolt, machine screw, or threaded rod conforming to the same metric coarse pitch specification. Where vibration resistance is a concern, pair with a DIN 985 nyloc nut on the reverse or use a spring washer under the nut face.

Typical applications

  • Marine and coastal assemblies - boat hardware, marina pontoons, jetty fixings
  • Swimming pool surrounds, water treatment plant, and pump assemblies
  • Offshore and coastal structures with saltwater and chloride exposure
  • Food processing, chemical plant, and washdown environments

Available in packs of 20 to 100, with free next-day UK delivery on orders over £50 and 30-day no-quibble returns.

*Photos, diagrams and other images are for illustration only and may not show the exact item supplied. Simfix reserves the right to alter or replace any photo, diagram or image at any time at its sole discretion.

**Orders that cannot be split will be rounded up to the next full pack or box quantity.

Simfix reserves the right to change quantities, stock levels and prices at any time. We accept no liability for the accuracy of dimensional data, DIN/ISO references, technical data, customs tariff codes or EAN barcodes.

Fastener styleFull hexagon nut
StandardDIN 934
MaterialA4 stainless steel (316)
Property classA4-70
Thread sizeM4
Thread pitch0.7 mm (coarse)
Head typeHexagon
Drive typeExternal hex (spanner)
Surface finishPlain (no plating)
HS commodity code7318163990
Recommended useMarine

RoHS and REACH compliant.

How do I choose between A2 and A4 stainless steel?

A2 (304) stainless steel suits most indoor, outdoor and workshop jobs. Choose A4 (316) marine grade for coastal, marine, poolside or other chloride-rich environments.

How do I make sure I order the right size?

Check the size in the product title and the standard, material and dimensions in the Product Specification tab. In M8 x 30, M8 is the thread diameter and 30 is the length in millimetres. See our size guide if you need more help.

When will my order arrive?

Orders placed before 4pm Monday-Friday are typically dispatched the same working day and every order is tracked. Next-day delivery is free over £50, or £5.50 below that threshold. Full options are shown at checkout.

What if I order the wrong item?

Email contact@simfix.com within 30 days of delivery with your order number. We will help arrange a refund or replacement. See our refunds information for the full process.

Is checkout secure?

Yes. Checkout is protected by SSL encryption and payments are processed through Shopify's secure checkout and supported payment providers. Simfix does not store your full card details.

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