M48×5 thread
M48×5 tap drill
43 mm
Clearance hole 50 mm · 75 mm hex
M48×5 is a coarse metric thread with a 48 mm (1.890") major diameter and 5 mm pitch. Tap it with a 43 mm drill; drill 50 mm to pass a bolt through.
The numbers
- Designation
- M48×5
- Major diameter
- 48 mm / 1.890"
- Minor diameter
- 42.587 mm
- Pitch
- 5 mm pitch
- Tap drill (75% thread)
- 43 mm — 43 mm
- Clearance hole (close fit)
- 50 mm / 1.969"
- Hex across flats
- 75 mm
How to measure what you have
- Measure across the thread crests with calipers. A used M48×5 reads a little under 48 mm — the crests are truncated by the standard, then worn and plated, so anything from about 47.6 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 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
5150–6950 N·m
3799.2–5127.0 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
- Very large flange and foundation bolting
- Turbine and generator holding-down bolts
- Heavy forging and press equipment
Common questions
- What size drill for an M48×5 tap?
- 43 mm (43 mm), which gives about 75% thread engagement.
- What clearance hole for M48×5?
- 50 mm for a close fit — enough to pass the bolt without slop.
- What spanner fits M48×5?
- 75 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