--- title: "M12×1.75 tap drill 10.2 mm, clearance 13 mm" description: "M12×1.75: tap drill 10.2 mm, clearance hole 13 mm, 18 mm hex. Full thread dimensions, how to identify it, and torque." url: https://atoneplace.net/fastener/m12-1-75/ site: "At One Place" --- # M12×1.75 thread **M12×1.75 tap drill: 10.2 mm** Clearance hole 13 mm · 18 mm hex M12×1.75 is a coarse metric thread with a 12 mm (0.472") major diameter and 1.75 mm pitch. Tap it with a 10.2 mm drill; drill 13 mm to pass a bolt through. ## The numbers - **Designation:** M12×1.75 - **Major diameter:** 12 mm / 0.472" - **Minor diameter:** 10.106 mm - **Pitch:** 1.75 mm pitch - **Tap drill (75% thread):** 10.2 mm — 10.2 mm - **Clearance hole (close fit):** 13 mm / 0.512" - **Hex across flats:** 18 mm ## How to measure what you have 1. Measure across the thread crests with calipers. A used M12×1.75 reads a little under 12 mm — the crests are truncated by the standard, then worn and plated, so anything from about 11.6 mm up is consistent with this size. 2. Measure the pitch: put a rule against the threads and count the distance over ten crests, then divide by ten. This one should give 1.75 mm. 3. 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: 72–97 N·m** 53.1–71.6 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 - Structural steel connections in metric practice - Towbar and tow-bracket mounting bolts - Machine feet and levelling mounts - Car suspension arms and subframe bolts > Two traps. The tap drill: nominal minus pitch is 10.25 mm, which is not a stocked size, so most charts give 10.2 mm and a few give 10.3 mm — use 10.2 mm in steel and 10.3 mm in something that grabs, such as stainless. The spanner: ISO 4014 and ISO 4032 give 18 mm across flats, while the older DIN 931 and DIN 934 parts take 19 mm. ## Other threads at this diameter *Same diameter, different pitch. Forcing the wrong one strips the thread in a turn or two.* | Thread | Pitch | Tap drill | Clearance | | --- | --- | --- | --- | | M12×1.5 | 1.5 mm | 10.5 mm | 13 mm | | M12×1.25 | 1.25 mm | 10.8 mm | 13 mm | | M12×1 | 1 mm | 11 mm | 13 mm | ## Common questions ### What size drill for an M12×1.75 tap? 10.2 mm (10.2 mm), which gives about 75% thread engagement. ### What clearance hole for M12×1.75? 13 mm for a close fit — enough to pass the bolt without slop. ### What spanner fits M12×1.75? 18 mm across the flats on a standard hex head. ## Related pages - [M12×1.5](https://atoneplace.net/fastener/m12-1-5/) - [M12×1.25](https://atoneplace.net/fastener/m12-1-25/) - [M12×1](https://atoneplace.net/fastener/m12-1/) - [M10×1.5](https://atoneplace.net/fastener/m10-1-5/) - [M14×2](https://atoneplace.net/fastener/m14-2/) - [M10×1.25](https://atoneplace.net/fastener/m10-1-25/) - [M10×1](https://atoneplace.net/fastener/m10-1/) - [M14×1.5](https://atoneplace.net/fastener/m14-1-5/) - [M14×1.25](https://atoneplace.net/fastener/m14-1-25/) - [M8×1.25](https://atoneplace.net/fastener/m8-1-25/) - [M16×2](https://atoneplace.net/fastener/m16-2/) - [M8×1](https://atoneplace.net/fastener/m8-1/) - [M8×0.75](https://atoneplace.net/fastener/m8-0-75/) ## Sources - Official vendor product documentation — At One Place (/about/) - Typical range compiled from manufacturer specifications — At One Place (/about/)