M24×1.5 thread: 24 × 1.5 mm

Threads › M24×1.5

M24×1.5 is an ISO metric fine thread: 24 mm major diameter, 1.5 mm pitch, 60° form. Clearance hole 25 mm (close) or 26 mm (normal).

Standard	ISO metric fine
Major diameter	24 mm
Pitch	1.5 mm
Thread angle	60°
Minor diameter, bolt	22.16 mm
Minor diameter, nut	22.38 mm
Tap drill	Not listed. Check your tap maker's chart.
Clearance hole	25 mm close, 26 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 M24×1.5 in Benchsmith Add to order list

What the call-out means

`M`	ISO metric
`24`	Major diameter, mm
`× 1.5`	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

M243 mm pitch
M24×22 mm pitch

Close in size, won't mate

Tr24×5Ø24 mm, 5 mm pitch

One size up or down

M22×1.5Ø22 mm (down)
M27×2Ø27 mm (up)

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