M8 x 50mm coach bolt in A2 stainless steel to DIN 603. The domed round head and square neck lock against the timber face, preventing rotation during tightening - ideal for outdoor timber structures, fencing, gates, and garden furniture. A2 (304 grade) gives good corrosion resistance for indoor and non-coastal outdoor use. Free next-day UK delivery on orders over £50.
  • M8 x 50mm coach bolt A2 stainless DIN 603 stainless steel
  • DIN 603 coach bolt M8 x 50mm A2 stainless steel, side profile
  • Domed head detail - M8 x 50mm A2 stainless coach bolt DIN 603
  • Simfix product label - 603A208050PK10-SIM
  • Simfix product label - 603A208050PK50-SIM
M8 x 50mm coach bolt A2 stainless DIN 603 stainless steel
DIN 603 coach bolt M8 x 50mm A2 stainless steel, side profile
Domed head detail - M8 x 50mm A2 stainless coach bolt DIN 603
Simfix product label - 603A208050PK10-SIM
Simfix product label - 603A208050PK50-SIM

Simfix

Cup Square Bolt DIN 603 A2 Stainless Steel (M8 X 50)

SKU 603A208050PK10-SIM
£6.07
Pack size:
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M8 x 50mm coach bolt in A2 stainless steel to DIN 603. The domed round head and square neck lock against the timber face, preventing rotation during tightening - ideal for outdoor timber structures, fencing, gates, and garden furniture. A2 (304 grade) gives good corrosion resistance for indoor and non-coastal outdoor use. Free next-day UK delivery on orders over £50.
£6.07
M8 x 50mm coach bolt A2 stainless DIN 603 stainless steel DIN 603 coach bolt M8 x 50mm A2 stainless steel, side profile Domed head detail - M8 x 50mm A2 stainless coach bolt DIN 603 Simfix product label - 603A208050PK10-SIM Simfix product label - 603A208050PK50-SIM
M8 x 50mm coach bolt A2 stainless DIN 603 stainless steel DIN 603 coach bolt M8 x 50mm A2 stainless steel, side profile Domed head detail - M8 x 50mm A2 stainless coach bolt DIN 603 Simfix product label - 603A208050PK10-SIM Simfix product label - 603A208050PK50-SIM

This M8 x 50mm coach bolt (cup square head bolt) is manufactured to DIN 603 in A2 stainless steel (304 grade). DIN 603 specifies a domed round head with a small square neck directly below the head. When drawn into timber, the square neck embeds into the timber face and locks the bolt against rotation, so only the nut needs a spanner during tightening. The smooth domed head on the visible face reduces snag risk and gives a neat appearance in outdoor structures, fencing, and play equipment.

Typical applications

  • Timber-to-timber and timber-to-steel connections with a flush round head
  • Garden gates, fencing panels, and agricultural timber structures
  • Play equipment, outdoor furniture, and landscape installations
  • Pergolas, decking subframes, and structural outdoor joinery

Available in packs of 10 to 50, with free next-day UK delivery on orders over £50 and 30-day no-quibble returns.

Fastener styleCup square bolt with square neck
StandardDIN 603
MaterialA2 stainless steel (304)
Property classA2-70
Thread sizeM8
Thread pitch1.25 mm (coarse)
Length50 mm
Head typeCup square (carriage)
Drive typeExternal hex (spanner)
Surface finishPlain (no plating)
HS commodity code7318159585
Recommended useOutdoor

RoHS and REACH compliant.

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