Simfix

M5 X 20 Hexagon Socket Cap Screw 10 Pack ISO 4762 A4 Stainless Steel

SKU 4762A40502070PK10-SIM
1000+ in stockReady to dispatch
£4.88
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.
Secure SSL checkout Checkout is encrypted and supports secure Shopify payment options.
Speedy refunds If something is not right, contact us within 30 days of delivery and we will sort a refund or replacement quickly.

M5 x 20mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance. A4 (316) gives outstanding saltwater and chloride resistance for marine, coastal, and pool use. Free next-day UK delivery on orders over £50.
£4.88

M5 x 20mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance. A4 (316) gives outstanding saltwater and chloride resistance for marine, coastal, and pool use. Free next-day UK delivery on orders over £50.
  • M5 x 20mm socket cap screw marine grade 316 ISO 4762
  • ISO 4762 socket cap screw M5 x 20mm A4 marine grade stainless steel, side profile
  • Allen key socket head detail - M5 x 20mm A4 stainless cap screw ISO 4762
  • Hexagon Socket Cap Screw in a real-life marine application. A deep hex drive for accessible marine assemblies.
  • Simfix product label - 4762A40502070PK10-SIM
  • Simfix product label - 4762A40502070PK50-SIM
M5 x 20mm socket cap screw marine grade 316 ISO 4762
ISO 4762 socket cap screw M5 x 20mm A4 marine grade stainless steel, side profile
Allen key socket head detail - M5 x 20mm A4 stainless cap screw ISO 4762
Hexagon Socket Cap Screw in a real-life marine application. A deep hex drive for accessible marine assemblies.
Simfix product label - 4762A40502070PK10-SIM
Simfix product label - 4762A40502070PK50-SIM
Secure checkoutProtected, encrypted payment
simfix.com
Secure Checkout Certified Secure No Malware
M5 x 20mm socket cap screw marine grade 316 ISO 4762 ISO 4762 socket cap screw M5 x 20mm A4 marine grade stainless steel, side profile Allen key socket head detail - M5 x 20mm A4 stainless cap screw ISO 4762 Hexagon Socket Cap Screw in a real-life marine application. A deep hex drive for accessible marine assemblies. Simfix product label - 4762A40502070PK10-SIM Simfix product label - 4762A40502070PK50-SIM
M5 x 20mm socket cap screw marine grade 316 ISO 4762 ISO 4762 socket cap screw M5 x 20mm A4 marine grade stainless steel, side profile Allen key socket head detail - M5 x 20mm A4 stainless cap screw ISO 4762 Hexagon Socket Cap Screw in a real-life marine application. A deep hex drive for accessible marine assemblies. Simfix product label - 4762A40502070PK10-SIM Simfix product label - 4762A40502070PK50-SIM

This M5 x 20mm socket cap screw is manufactured to ISO 4762 in A4 stainless steel (316 marine grade). ISO 4762 specifies a cylindrical head with an internal hex socket, driven with a hex key (Allen key). The tall cylindrical head allows deep socket engagement and transfers high torque without the need for a spanner clearance envelope - allowing use in recessed positions and confined assemblies where a standard hex head bolt would be inaccessible. The compact head profile suits applications where appearance and precision are both important.

Typical applications

  • Marine equipment, boat deck hardware, and waterside fabrication
  • Swimming pool plant, pump assemblies, and water treatment equipment
  • Offshore structures and coastal installations with saltwater exposure
  • Chemical plant, food processing, and hygienic equipment

Available in packs of 10 to 50, 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 styleSocket cap screw with hex socket drive
StandardISO 4762
MaterialA4 stainless steel (316)
Property classA4-70
Thread sizeM5
Thread pitch0.8 mm (coarse)
Length20 mm
Head typeSocket cap
Drive typeHex socket (Allen)
Surface finishPlain (no plating)
HS commodity code7318156290
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.

View all FAQs

Customers also bought

    • Free next-day delivery over £50

    • Orders Before 4pm Ship Today

    • Secure SSL Checkout

    • No-Return Refunds