Countersunk Socket Head Screw

3D

A countersunk screw with a hex socket; the head seats fully into a countersunk hole, leaving the surface smooth for sliding parts or covers. Drive it with a hex key; the socket allows firm tightening without the tool slipping out. It is used where a projecting head would catch or spoil the look, such as on machine guards and mould plates. Take care not to overtighten in soft material, as the cone can split the hole.

Matching components

Hex NutDIN 934 · M3–M36Nylon Insert Lock NutDIN 985 · M4–M36Serrated Hex Flange NutDIN 6923 · M5–M16

Questions

Why is 12.9 not offered zinc plated?

Electroplating traps hydrogen in hardened 12.9 steel, and the screw can crack after tightening. 12.9 is supplied Dacromet, phosphated, blackened and plain instead.

Order assurance

Reports & inspection

• EN 10204 3.1 material certificate
• Dimensional inspection report
• Certificate of conformity
• Mechanical test report
• Chemical analysis report
• Coating inspection report
• Batch and lot traceability

Packaging & delivery

• Bulk carton packing
• Small boxes with outer cartons
• Palletized shipment
• Fumigation-free pallets
• Inner poly bags
• Buyer branding and labels

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