ISO 10642

Countersunk Screw

Flat countersunk head screw with an internal hexagon drive, ISO 10642. The head sits flush with the surface once seated in a matching chamfer.

Countersunk Screw — technical drawing with reference dimensions
dldkks
Designation d Pitch dk k s dw dh Lengths
M3 common 3.0 0.5 6.721.9 2.0 — 3.4
6–30 mm (8)
lbWeight /100
6 mm 6 mm 0.030 kg
8 mm 8 mm 0.038 kg
10 mm 10 mm 0.046 kg
12 mm 12 mm 0.054 kg
16 mm 16 mm 0.070 kg
20 mm 18 mm 0.086 kg
25 mm 18 mm 0.107 kg
30 mm 18 mm 0.128 kg
M4 common 4.0 0.7 8.962.5 2.5 — 4.5
6–40 mm (9)
lbWeight /100
6 mm 6 mm 0.055 kg
8 mm 8 mm 0.068 kg
10 mm 10 mm 0.082 kg
12 mm 12 mm 0.096 kg
16 mm 16 mm 0.123 kg
20 mm 20 mm 0.151 kg
25 mm 20 mm 0.186 kg
30 mm 20 mm 0.220 kg
40 mm 20 mm 0.289 kg
M5 common 5.0 0.8 11.23.1 3.0 — 5.5
8–50 mm (9)
lbWeight /100
8 mm 8 mm 0.100 kg
10 mm 10 mm 0.122 kg
12 mm 12 mm 0.144 kg
16 mm 16 mm 0.188 kg
20 mm 20 mm 0.232 kg
25 mm 22 mm 0.287 kg
30 mm 22 mm 0.342 kg
40 mm 22 mm 0.452 kg
50 mm 22 mm 0.562 kg
M6 common 6.0 1 13.443.7 4.0 — 6.6
10–60 mm (9)
lbWeight /100
10 mm 10 mm 0.174 kg
12 mm 12 mm 0.205 kg
16 mm 16 mm 0.268 kg
20 mm 20 mm 0.331 kg
25 mm 24 mm 0.410 kg
30 mm 24 mm 0.489 kg
40 mm 24 mm 0.647 kg
50 mm 24 mm 0.805 kg
60 mm 24 mm 0.963 kg
M8 common 8.0 1.25 17.925.0 5.0 — 9.0
12–80 mm (11)
lbWeight /100
12 mm 12 mm 0.388 kg
16 mm 16 mm 0.493 kg
20 mm 20 mm 0.597 kg
25 mm 25 mm 0.733 kg
30 mm 28 mm 0.868 kg
35 mm 28 mm 1.004 kg
40 mm 28 mm 1.139 kg
50 mm 28 mm 1.410 kg
60 mm 28 mm 1.681 kg
70 mm 28 mm 1.952 kg
80 mm 28 mm 2.223 kg
M10 common 10.0 1.5 22.46.2 6.0 — 11.0
16–100 mm (11)
lbWeight /100
16 mm 16 mm 0.752 kg
20 mm 20 mm 0.915 kg
25 mm 25 mm 1.125 kg
30 mm 30 mm 1.336 kg
40 mm 32 mm 1.756 kg
50 mm 32 mm 2.177 kg
60 mm 32 mm 2.597 kg
70 mm 32 mm 3.018 kg
80 mm 32 mm 3.438 kg
90 mm 32 mm 3.858 kg
100 mm 32 mm 4.278 kg
M12 common 12.0 1.75 26.887.4 8.0 — 13.5
20–100 mm (13)
lbWeight /100
20 mm 20 mm 1.412 kg
25 mm 25 mm 1.718 kg
30 mm 30 mm 2.024 kg
35 mm 35 mm 2.330 kg
40 mm 36 mm 2.636 kg
50 mm 36 mm 3.248 kg
55 mm 36 mm 3.554 kg
60 mm 36 mm 3.861 kg
65 mm 36 mm 4.167 kg
70 mm 36 mm 4.473 kg
80 mm 36 mm 5.085 kg
90 mm 36 mm 5.697 kg
100 mm 36 mm 6.310 kg
M14 14.0 2 30.88.4 10.0 — 15.5
25–100 mm (12)
lbWeight /100
25 mm 25 mm 2.275 kg
30 mm 30 mm 2.671 kg
35 mm 35 mm 3.066 kg
40 mm 40 mm 3.462 kg
50 mm 40 mm 4.253 kg
55 mm 40 mm 4.649 kg
60 mm 40 mm 5.045 kg
65 mm 40 mm 5.441 kg
70 mm 40 mm 5.837 kg
80 mm 40 mm 6.628 kg
90 mm 40 mm 7.420 kg
100 mm 40 mm 8.211 kg
M16 common 16.0 2 33.68.8 10.0 — 17.5
25–100 mm (12)
lbWeight /100
25 mm 25 mm 2.832 kg
30 mm 30 mm 3.317 kg
35 mm 35 mm 3.803 kg
40 mm 40 mm 4.288 kg
50 mm 44 mm 5.258 kg
55 mm 44 mm 5.744 kg
60 mm 44 mm 6.229 kg
65 mm 44 mm 6.715 kg
70 mm 44 mm 7.200 kg
80 mm 44 mm 8.171 kg
90 mm 44 mm 9.142 kg
100 mm 44 mm 10.112 kg
M20 20.0 2.5 40.3210.2 12.0 — 22.0
30–100 mm (11)
lbWeight /100
30 mm 30 mm 5.494 kg
35 mm 35 mm 6.248 kg
40 mm 40 mm 7.002 kg
50 mm 50 mm 8.510 kg
55 mm 52 mm 9.264 kg
60 mm 52 mm 10.018 kg
65 mm 52 mm 10.772 kg
70 mm 52 mm 11.526 kg
80 mm 52 mm 13.034 kg
90 mm 52 mm 14.542 kg
100 mm 52 mm 16.050 kg

All dimensions in mm. Weight figures are indicative (steel), per 100 pieces.

Glossary

d
Nominal (major) diameter
l
Length
b
Nominal thread length
dk
Head diameter
k
Head height
s
Wrench size (across flats)
dw
Bearing face diameter
dh
Clearance hole diameter (ISO 273, medium series)

Frequently asked questions

What standard governs the countersunk screw?

ISO 10642 — the dimensions in the table below (nominal diameter, thread pitch and all fixed geometry) are taken directly from that standard.

Are these dimensions in millimetres?

Yes — all values are in mm, matching the metric ISO/UNI standards these components are drawn from. There are no imperial variants in this table.

What is the difference between k and dk?

k is the head height (how tall the head is). dk is the head diameter (how wide it is) — used to size a counterbore or clearance pocket for the head.

References & further reading

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More in Bolts

Hex Head Bolt , Socket Head Cap Screw — or back to the Bolts overview.