M6 x 30mm socket cap screw marine grade 316 ISO 4762

Offer of the week Ends Sunday

M6 x 30mm Socket Cap Screw A4 Marine Grade ISO 4762

Free UK delivery on orders over £50

£4.45 £5.23 Save £0.78
Shop the offer→
  • Bolts
    Bolts
    35 products
  • M6 dome nut marine grade 316 DIN 1587
    Nuts
    30 products
  • 6.3mm x 25mm hex self-drilling screw A2 stainless DIN 7504
    Screws
    205 products
  • M10 flat washer Form C marine grade 316 BS 4320
    Washers
    30 products
Also available on diy.com Verified seller on B&Q MarketplaceSimfix products are available on diy.com, sold and shipped by Simfix. View Simfix on B&Q

Marine Grade Fasteners

Marine turnbuckles and rigging hardware on a sailing vessel

A4 stainless steel fixings for salt, spray and tough coastal conditions.

A4 stainless Salt-spray ready Coastal projects
View all
  • Courier carrying three stacked cardboard parcels ready for dispatch
    Before 4pm

    Delivery that keeps you moving

    Order before 4pm Monday-Friday and we aim to dispatch the same working day, with express options shown at checkout.

    Delivery info
  • Close up of stainless steel hexagon full nuts in an orange parts bin
    A2 or A4

    A2 & A4 stainless made simple

    A2 suits most indoor, outdoor and workshop jobs. Pick A4 marine grade for coastal, wet or salt-spray environments.

    Read the guide
  • Stack of wooden blocks printed with smiley faces, representing customer satisfaction
    30 days from delivery

    Speedy Refunds

    If something is not right, contact us within 30 days of delivery for a full refund or replacement.

    Refund policy

Our whole range

Shop stainless fixings without the product-wall feeling

Open guided shop
Complete catalogue Shop all products Browse every Simfix stainless fixing in one place.300 products
Inside jobs Indoor Furniture, kitchens, bathrooms and clean interior fit-out.50 products Weather exposed Outdoor Garden structures, fencing, roofing and weather-exposed jobs.38 products Bench work Workshop Engineering, fabrication, repairs and machinery maintenance.121 products A4 316 Marine A4 316 stainless for boats, coastal properties and salt exposure.91 products

THE FIX - ESSENTIAL GUIDES

  • Clean and galled stainless steel bolt assemblies beside anti-seize compound
    How to Stop Stainless Steel Bolts Seizing: Thread Galling Guide

  • Stainless steel screws with insulating washers fitted to a satin aluminium panel
    Stainless Steel Screws in Aluminium: Galvanic Corrosion Guide

  • Torque wrench fitted to a stainless steel hex bolt beside a range of metric bolts
    Stainless Steel Bolt Torque Chart: A2-70, A4-70 and A4-80 Explained

ABOUT SIMFIX

Simfix is a UK-based specialist in stainless steel fasteners, built for the people who actually use them - tradespeople, DIY enthusiasts and anyone who refuses to compromise on quality.

From a single pack of screws to a full project order, we stock A2 and A4 marine-grade stainless steel fixings designed to stand up to British weather, treated timber and tough outdoor conditions. Clear product information, sensible pack sizes and fast UK dispatch - that's what Simfix is here for.

Whatever you're building, fixing or finishing, we'll help you get the right fastener first time.

Outdoor project? Simfix. Workshop fix? Simfix. Indoor job? You know where to go.