M36×4 thread
M36×4 tap drill
32 mm
Clearance hole 37 mm · 55 mm hex
M36×4 is a coarse metric thread with a 36 mm (1.417") major diameter and 4 mm pitch. Tap it with a 32 mm drill; drill 37 mm to pass a bolt through.
The numbers
- Designation
- M36×4
- Major diameter
- 36 mm / 1.417"
- Minor diameter
- 31.67 mm
- Pitch
- 4 mm pitch
- Tap drill (75% thread)
- 32 mm — 32 mm
- Clearance hole (close fit)
- 37 mm / 1.457"
- Hex across flats
- 55 mm
How to measure what you have
- Measure across the thread crests with calipers. A used M36×4 reads a little under 36 mm — the crests are truncated by the standard, then worn and plated, so anything from about 35.6 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 4 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
2300–2800 N·m
1696.7–2065.6 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
- Wind turbine foundation and tower bolts
- Bridge bearing and expansion-joint anchors
- Very large flange connections
Common questions
- What size drill for an M36×4 tap?
- 32 mm (32 mm), which gives about 75% thread engagement.
- What clearance hole for M36×4?
- 37 mm for a close fit — enough to pass the bolt without slop.
- What spanner fits M36×4?
- 55 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