Workshop

Thread Cut

Size

ISO Metric Coarse

M10×1.5

60° · 60° V · parallel

Pitch
1.500 mm
TPI
16.93
Form
Parallel

Tap drill

8.50 mm0.3346"

Q (0.3320")

Workshop chart ≈ 75% engagement for fastening V-threads. Adjust for material and class of fit.

Clearance drill

ISO 273 medium / normal

11.00 mm0.4331"

Diameters

Nominal / basic major Ø
d / D
10.00 mm0.3937"
Pitch Ø
d2 / D2
9.03 mm0.3553"
Minor Ø external
screw root
8.16 mm0.3212"
Minor Ø internal
nut core — tap drill targets this
8.38 mm0.3298"
Thread height h
radial depth
0.98 mm0.0384"
Crest flat P/8
0.19 mm0.0074"

Lathe helpers

Compound infeed
half-angle
29.5°
Depth of cut (radial)
pass towards minor
0.98 mm0.0384"
Lead angle
atan(lead / π · d2)
3.03°
Best wire Ø
three-wire, pitch-line contact
0.87 mm0.0341"
Measurement over wires
at basic pitch Ø
10.32 mm0.4065"

Measure pitch diameter, not just major Ø. A thread can mic correctly on the crests and still be undersize on d2.

Notes

  • Measure pitch diameter, not just major Ø — worn or single-pointed work can look right on a mic over the crests and still be undersize on d2.

ISO 68 / 261 / 724 / 965 · Charts are guidance — confirm critical work against the standard.