Countersunk Socket Head Screw

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.

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M3 × 0.599 variantsk1.86s2dk6.72DIN 7991: k ≥ 1.7 mm, dk = 6 mm
Lengthmm	Material	Grade	Finish		Stock	MOQpcs	≈ kg/ 1,000 pcs	Quantitypcs
8	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	0.56
	8	Carbon Steel	Class 8.8	Blackened		Made to order	2,000	0.56
	8	Carbon Steel	Class 8.8	Phosphate		Made to order	2,000	0.56
	8	Carbon Steel	Class 8.8	Plain		Made to order	2,000	0.56
	8	Alloy Steel	Class 10.9	Zinc Plated		Made to order	2,000	0.56
	8	Alloy Steel	Class 10.9	Blackened		Made to order	2,000	0.56
	8	Alloy Steel	Class 10.9	Phosphate		Made to order	2,000	0.56
	8	Alloy Steel	Class 10.9	Plain		Made to order	2,000	0.56
	8	Alloy Steel	Class 12.9	Blackened		Made to order	2,000	0.56
	8	Alloy Steel	Class 12.9	Phosphate		Made to order	2,000	0.56
	8	Alloy Steel	Class 12.9	Plain		Made to order	2,000	0.56
	8	Stainless Steel	A2-70	Plain		Made to order	2,000	0.56
	8	Stainless Steel	A2-70	Passivated		Made to order	2,000	0.56
	8	Stainless Steel	A4-80	Plain		Made to order	2,000	0.56
	8	Stainless Steel	A4-80	Passivated		Made to order	2,000	0.56
10	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	0.65
	10	Carbon Steel	Class 8.8	Blackened		Made to order	2,000	0.64
	10	Carbon Steel	Class 8.8	Phosphate		Made to order	2,000	0.64
	10	Carbon Steel	Class 8.8	Plain		Made to order	2,000	0.64
	10	Alloy Steel	Class 10.9	Zinc Plated		Made to order	2,000	0.65
	10	Alloy Steel	Class 10.9	Blackened		Made to order	2,000	0.64
	10	Alloy Steel	Class 10.9	Phosphate		Made to order	2,000	0.64
	10	Alloy Steel	Class 10.9	Plain		Made to order	2,000	0.64
	10	Alloy Steel	Class 12.9	Blackened		Made to order	2,000	0.64
	10	Alloy Steel	Class 12.9	Phosphate		Made to order	2,000	0.64
	10	Alloy Steel	Class 12.9	Plain		Made to order	2,000	0.64
	10	Stainless Steel	A2-70	Plain		Made to order	2,000	0.65
	10	Stainless Steel	A2-70	Passivated		Made to order	2,000	0.65
	10	Stainless Steel	A4-80	Plain		Made to order	2,000	0.65
	10	Stainless Steel	A4-80	Passivated		Made to order	2,000	0.65
12	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	0.74
	12	Carbon Steel	Class 8.8	Blackened		Made to order	2,000	0.73
	12	Carbon Steel	Class 8.8	Phosphate		Made to order	2,000	0.73
	12	Carbon Steel	Class 8.8	Plain		Made to order	2,000	0.73
	12	Alloy Steel	Class 10.9	Zinc Plated		Made to order	2,000	0.74
	12	Alloy Steel	Class 10.9	Blackened		Made to order	2,000	0.73
	12	Alloy Steel	Class 10.9	Phosphate		Made to order	2,000	0.73
	12	Alloy Steel	Class 10.9	Plain		Made to order	2,000	0.73
	12	Alloy Steel	Class 12.9	Blackened		Made to order	2,000	0.73
	12	Alloy Steel	Class 12.9	Phosphate		Made to order	2,000	0.73
	12	Alloy Steel	Class 12.9	Plain		Made to order	2,000	0.73
	12	Stainless Steel	A2-70	Plain		Made to order	2,000	0.74
	12	Stainless Steel	A2-70	Passivated		Made to order	2,000	0.74
	12	Stainless Steel	A4-80	Plain		Made to order	2,000	0.74
	12	Stainless Steel	A4-80	Passivated		Made to order	2,000	0.74
16	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	0.92
	16	Carbon Steel	Class 8.8	Blackened		Made to order	2,000	0.91
	16	Carbon Steel	Class 8.8	Phosphate		Made to order	2,000	0.91
	16	Carbon Steel	Class 8.8	Plain		Made to order	2,000	0.91
	16	Alloy Steel	Class 10.9	Zinc Plated		Made to order	2,000	0.92
	16	Alloy Steel	Class 10.9	Blackened		Made to order	2,000	0.91
	16	Alloy Steel	Class 10.9	Phosphate		Made to order	2,000	0.91
	16	Alloy Steel	Class 10.9	Plain		Made to order	2,000	0.91
	16	Alloy Steel	Class 12.9	Blackened		Made to order	2,000	0.91
	16	Alloy Steel	Class 12.9	Phosphate		Made to order	2,000	0.91
	16	Alloy Steel	Class 12.9	Plain		Made to order	2,000	0.91
	16	Stainless Steel	A2-70	Plain		Made to order	2,000	0.92
	16	Stainless Steel	A2-70	Passivated		Made to order	2,000	0.92
	16	Stainless Steel	A4-80	Plain		Made to order	2,000	0.92
	16	Stainless Steel	A4-80	Passivated		Made to order	2,000	0.92
20	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	1.10
	20	Carbon Steel	Class 8.8	Blackened		Made to order	2,000	1.08
	20	Carbon Steel	Class 8.8	Phosphate		Made to order	2,000	1.08
	20	Carbon Steel	Class 8.8	Plain		Made to order	2,000	1.08
	20	Alloy Steel	Class 10.9	Zinc Plated		Made to order	2,000	1.10
	20	Alloy Steel	Class 10.9	Blackened		Made to order	2,000	1.08
	20	Alloy Steel	Class 10.9	Phosphate		Made to order	2,000	1.08
	20	Alloy Steel	Class 10.9	Plain		Made to order	2,000	1.08
	20	Alloy Steel	Class 12.9	Blackened		Made to order	2,000	1.08
	20	Alloy Steel	Class 12.9	Phosphate		Made to order	2,000	1.08
	20	Alloy Steel	Class 12.9	Plain		Made to order	2,000	1.08
	20	Stainless Steel	A2-70	Plain		Made to order	2,000	1.10
	20	Stainless Steel	A2-70	Passivated		Made to order	2,000	1.10
	20	Stainless Steel	A4-80	Plain		Made to order	2,000	1.10
	20	Stainless Steel	A4-80	Passivated		Made to order	2,000	1.10
25	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	1.32
	25	Carbon Steel	Class 8.8	Blackened		Made to order	2,000	1.31
	25	Carbon Steel	Class 8.8	Plain		Made to order	2,000	1.31
	25	Alloy Steel	Class 10.9	Zinc Plated		Made to order	2,000	1.32
	25	Alloy Steel	Class 10.9	Blackened		Made to order	2,000	1.31
	25	Alloy Steel	Class 10.9	Plain		Made to order	2,000	1.31
	25	Alloy Steel	Class 12.9	Blackened		Made to order	2,000	1.31
	25	Alloy Steel	Class 12.9	Plain		Made to order	2,000	1.31
	25	Stainless Steel	A2-70	Plain		Made to order	2,000	1.32
	25	Stainless Steel	A2-70	Passivated		Made to order	2,000	1.32
	25	Stainless Steel	A4-80	Plain		Made to order	2,000	1.32
	25	Stainless Steel	A4-80	Passivated		Made to order	2,000	1.32
30	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	1.55
	30	Carbon Steel	Class 8.8	Blackened		Made to order	2,000	1.53
	30	Carbon Steel	Class 8.8	Plain		Made to order	2,000	1.53
	30	Alloy Steel	Class 10.9	Zinc Plated		Made to order	2,000	1.55
	30	Alloy Steel	Class 10.9	Blackened		Made to order	2,000	1.53
	30	Alloy Steel	Class 10.9	Plain		Made to order	2,000	1.53
	30	Alloy Steel	Class 12.9	Blackened		Made to order	2,000	1.53
	30	Alloy Steel	Class 12.9	Plain		Made to order	2,000	1.53
	30	Stainless Steel	A2-70	Plain		Made to order	2,000	1.54
	30	Stainless Steel	A2-70	Passivated		Made to order	2,000	1.54
	30	Stainless Steel	A4-80	Plain		Made to order	2,000	1.54
	30	Stainless Steel	A4-80	Passivated		Made to order	2,000	1.54

M4 × 0.7126 variantsk2.48s2.5dk8.96DIN 7991: k ≥ 2.3 mm, dk = 8 mm
Lengthmm	Material	Grade	Finish		Stock	MOQpcs	≈ kg/ 1,000 pcs	Quantitypcs
8	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	1.12
	8	Carbon Steel	Class 8.8	Blackened		Made to order	2,000	1.10
	8	Carbon Steel	Class 8.8	Phosphate		Made to order	2,000	1.10
	8	Carbon Steel	Class 8.8	Plain		Made to order	2,000	1.10
	8	Alloy Steel	Class 10.9	Zinc Plated		Made to order	2,000	1.12
	8	Alloy Steel	Class 10.9	Blackened		Made to order	2,000	1.10
	8	Alloy Steel	Class 10.9	Phosphate		Made to order	2,000	1.10
	8	Alloy Steel	Class 10.9	Plain		Made to order	2,000	1.10
	8	Alloy Steel	Class 12.9	Blackened		Made to order	2,000	1.10
	8	Alloy Steel	Class 12.9	Phosphate		Made to order	2,000	1.10
	8	Alloy Steel	Class 12.9	Plain		Made to order	2,000	1.10
	8	Stainless Steel	A2-70	Plain		Made to order	2,000	1.11
	8	Stainless Steel	A2-70	Passivated		Made to order	2,000	1.11
	8	Stainless Steel	A4-80	Plain		Made to order	2,000	1.11
	8	Stainless Steel	A4-80	Passivated		Made to order	2,000	1.11
10	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	1.27
	10	Carbon Steel	Class 8.8	Blackened		Made to order	2,000	1.26
	10	Carbon Steel	Class 8.8	Phosphate		Made to order	2,000	1.26
	10	Carbon Steel	Class 8.8	Plain		Made to order	2,000	1.26
	10	Alloy Steel	Class 10.9	Zinc Plated		Made to order	2,000	1.27
	10	Alloy Steel	Class 10.9	Blackened		Made to order	2,000	1.26
	10	Alloy Steel	Class 10.9	Phosphate		Made to order	2,000	1.26
	10	Alloy Steel	Class 10.9	Plain		Made to order	2,000	1.26
	10	Alloy Steel	Class 12.9	Blackened		Made to order	2,000	1.26
	10	Alloy Steel	Class 12.9	Phosphate		Made to order	2,000	1.26
	10	Alloy Steel	Class 12.9	Plain		Made to order	2,000	1.26
	10	Stainless Steel	A2-70	Plain		Made to order	2,000	1.27
	10	Stainless Steel	A2-70	Passivated		Made to order	2,000	1.27
	10	Stainless Steel	A4-80	Plain		Made to order	2,000	1.27
	10	Stainless Steel	A4-80	Passivated		Made to order	2,000	1.27
12	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	1.43
	12	Carbon Steel	Class 8.8	Blackened		Made to order	2,000	1.41
	12	Carbon Steel	Class 8.8	Phosphate		Made to order	2,000	1.41
	12	Carbon Steel	Class 8.8	Plain		Made to order	2,000	1.41
	12	Alloy Steel	Class 10.9	Zinc Plated		Made to order	2,000	1.43
	12	Alloy Steel	Class 10.9	Blackened		Made to order	2,000	1.41
	12	Alloy Steel	Class 10.9	Phosphate		Made to order	2,000	1.41
	12	Alloy Steel	Class 10.9	Plain		Made to order	2,000	1.41
	12	Alloy Steel	Class 12.9	Blackened		Made to order	2,000	1.41
	12	Alloy Steel	Class 12.9	Phosphate		Made to order	2,000	1.41
	12	Alloy Steel	Class 12.9	Plain		Made to order	2,000	1.41
	12	Stainless Steel	A2-70	Plain		Made to order	2,000	1.43
	12	Stainless Steel	A2-70	Passivated		Made to order	2,000	1.43
	12	Stainless Steel	A4-80	Plain		Made to order	2,000	1.43
	12	Stainless Steel	A4-80	Passivated		Made to order	2,000	1.43
16	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	1.74
	16	Carbon Steel	Class 8.8	Blackened		Made to order	2,000	1.72
	16	Carbon Steel	Class 8.8	Phosphate		Made to order	2,000	1.72
	16	Carbon Steel	Class 8.8	Plain		Made to order	2,000	1.72
	16	Alloy Steel	Class 10.9	Zinc Plated		Made to order	2,000	1.74
	16	Alloy Steel	Class 10.9	Blackened		Made to order	2,000	1.72
	16	Alloy Steel	Class 10.9	Phosphate		Made to order	2,000	1.72
	16	Alloy Steel	Class 10.9	Plain		Made to order	2,000	1.72
	16	Alloy Steel	Class 12.9	Blackened		Made to order	2,000	1.72
	16	Alloy Steel	Class 12.9	Phosphate		Made to order	2,000	1.72
	16	Alloy Steel	Class 12.9	Plain		Made to order	2,000	1.72
	16	Stainless Steel	A2-70	Plain		Made to order	2,000	1.74
	16	Stainless Steel	A2-70	Passivated		Made to order	2,000	1.74
	16	Stainless Steel	A4-80	Plain		Made to order	2,000	1.74
	16	Stainless Steel	A4-80	Passivated		Made to order	2,000	1.74
20	Carbon Steel	Class 8.8	Zinc Plated		Made to order	2,000	2.05

1167 combinations shown

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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.