M10×1.5 thread
M10×1.5 tap drill
8.5 mm
Clearance hole 10.5 mm · 16 mm hex
M10×1.5 is a coarse metric thread with a 10 mm (0.394") major diameter and 1.5 mm pitch. Tap it with a 8.5 mm drill; drill 10.5 mm to pass a bolt through.
The numbers
- Designation
- M10×1.5
- Major diameter
- 10 mm / 0.394"
- Minor diameter
- 8.376 mm
- Pitch
- 1.5 mm pitch
- Tap drill (75% thread)
- 8.5 mm — 8.5 mm
- Clearance hole (close fit)
- 10.5 mm / 0.413"
- Hex across flats
- 16 mm
How to measure what you have
- Measure across the thread crests with calipers. A used M10×1.5 reads a little under 10 mm — the crests are truncated by the standard, then worn and plated, so anything from about 9.6 mm up is consistent with this size.
- Measure the pitch: put a rule against the threads and count the distance over ten crests, then divide by ten. This one should give 1.5 mm.
- A thread pitch gauge settles it in seconds and costs very little. Guessing between a coarse and a fine thread of the same diameter is the usual way a thread gets stripped.
Tightening torque
Typical torque
41–56 N·m
30.2–41.3 lb·ft
Plain steel property class 8.8 or SAE grade 5, dry threads, tightened to about 65% of yield. Lubricated threads reach the same preload at 20-30% less torque. Where the manufacturer publishes a figure — spark plugs, wheel nuts, cylinder heads — use theirs.
Where this size turns up
- Brake caliper and suspension bolts on cars
- Motorcycle axle pinch bolts
- Engine and gearbox mounting bolts
- Scaffolding and staging fittings
ISO 4014 and ISO 4032 give 16 mm across flats; the older DIN 931 and DIN 934 parts you will still find in a drawer take a 17 mm spanner.
Other threads at this diameter
| Thread | Pitch | Tap drill | Clearance |
|---|---|---|---|
| M10×1.25 | 1.25 mm | 8.8 mm | 10.5 mm |
| M10×1 | 1 mm | 9 mm | 10.5 mm |
Common questions
- What size drill for an M10×1.5 tap?
- 8.5 mm (8.5 mm), which gives about 75% thread engagement.
- What clearance hole for M10×1.5?
- 10.5 mm for a close fit — enough to pass the bolt without slop.
- What spanner fits M10×1.5?
- 16 mm across the flats on a standard hex head.
Related pages
Sources
- Official vendor product documentation — At One Place
- Typical range compiled from manufacturer specifications — At One Place