M10×1.25 thread: 10 × 1.25 mm

Threads › M10×1.25

M10×1.25 is an ISO metric fine thread: 10 mm major diameter, 1.25 mm pitch, 60° form. Tap drill 8.8 mm. Clearance hole 10.5 mm (close) or 11 mm (normal).

Standard	ISO metric fine
Major diameter	10 mm
Pitch	1.25 mm
Thread angle	60°
Minor diameter, bolt	8.47 mm
Minor diameter, nut	8.65 mm
Tap drill	8.8 mm
Clearance hole	10.5 mm close, 11 mm normal
Usual class	6g bolt, 6H nut

Minor diameters worked out from the basic profile: major Ø − 1.22687 × pitch (bolt) and − 1.08253 × pitch (nut).

Open M10×1.25 in Benchsmith Add to order list

What the call-out means

`M`	ISO metric
`10`	Major diameter, mm
`× 1.25`	Pitch, mm. Given because it is a fine pitch
`-6g`	Bolt tolerance class (usual)
`-6H`	Nut tolerance class (usual)

Measure it

Bolt: Measure across the crests of the bolt with the caliper jaws. Worn bolts read 0.1 to 0.3 under.

Nut or tapped hole: Measure across the tops of the threads inside the nut or hole with the inside jaws. That is the minor Ø. Worn or oversize holes read a little over.

Same diameter, other pitch

M101.5 mm pitch
M10×11 mm pitch

Close in size, won't mate

Tr10×2Ø10 mm, 2 mm pitch
G1/8Ø9.73 mm, 28 TPI
R1/8Ø9.73 mm, 28 TPI
1/8-27 NPTØ10.29 mm, 27 TPI
3/8-16 UNCØ9.52 mm, 16 TPI
3/8-24 UNFØ9.52 mm, 24 TPI

One size up or down

M8×1Ø8 mm (down)
M12×1.5Ø12 mm (up)

Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.