M24 Thread Dimensions & Tolerance Calculator

M· ISO General Purpose

M24

ISO General Purpose

The everyday metric fastener thread. Coarse pitch (the default when no pitch is stated, e.g. M8) suits general assembly; fine pitch (stated explicitly, e.g. M8x1.0) gives a shallower thread for precision adjustment or higher tension in thin material.

Standard: ISO 261 / ISO 724
Flank angle: 60° included
Series: Coarse pitch (default) -- assumed when a designation states no pitch
Pitch: 3.00 mm
Fine option: M24 x 2

Thread profile

A 60 degree included flank angle.

Basic major 24.000 mm, pitch diameter 22.051 mm, minor diameter 20.752 mm -- theoretical dimensions at zero allowance, before any tolerance class is applied.

M coarse sizes

Basic dimensions, M coarse pitch
Designation	Pitch	Major Ø	Pitch Ø	Minor Ø
M1	0.25 mm	1.00 mm	0.838 mm	0.729 mm
M1.2	0.25 mm	1.20 mm	1.038 mm	0.929 mm
M1.6	0.35 mm	1.60 mm	1.373 mm	1.221 mm
M2	0.40 mm	2.00 mm	1.740 mm	1.567 mm
M2.5	0.45 mm	2.50 mm	2.208 mm	2.013 mm
M3	0.50 mm	3.00 mm	2.675 mm	2.459 mm
M3.5	0.60 mm	3.50 mm	3.110 mm	2.850 mm
M4	0.70 mm	4.00 mm	3.545 mm	3.242 mm
M5	0.80 mm	5.00 mm	4.480 mm	4.134 mm
M6	1.00 mm	6.00 mm	5.350 mm	4.917 mm
M7	1.00 mm	7.00 mm	6.350 mm	5.917 mm
M8	1.25 mm	8.00 mm	7.188 mm	6.647 mm
M10	1.50 mm	10.00 mm	9.026 mm	8.376 mm
M12	1.75 mm	12.00 mm	10.863 mm	10.106 mm
M14	2.00 mm	14.00 mm	12.701 mm	11.835 mm
M16	2.00 mm	16.00 mm	14.701 mm	13.835 mm
M18	2.50 mm	18.00 mm	16.376 mm	15.294 mm
M20	2.50 mm	20.00 mm	18.376 mm	17.294 mm
M22	2.50 mm	22.00 mm	20.376 mm	19.294 mm
M24	3.00 mm	24.00 mm	22.051 mm	20.752 mm
M27	3.00 mm	27.00 mm	25.051 mm	23.752 mm
M30	3.50 mm	30.00 mm	27.727 mm	26.211 mm
M33	3.50 mm	33.00 mm	30.727 mm	29.211 mm
M36	4.00 mm	36.00 mm	33.402 mm	31.670 mm
M39	4.00 mm	39.00 mm	36.402 mm	34.670 mm
M42	4.50 mm	42.00 mm	39.077 mm	37.129 mm
M45	4.50 mm	45.00 mm	42.077 mm	40.129 mm
M48	5.00 mm	48.00 mm	44.752 mm	42.587 mm
M52	5.00 mm	52.00 mm	48.752 mm	46.587 mm
M56	5.50 mm	56.00 mm	52.428 mm	50.046 mm
M60	5.50 mm	60.00 mm	56.428 mm	54.046 mm
M64	6.00 mm	64.00 mm	60.103 mm	57.505 mm

Designation calculator

Designation

MØ24 mmP 3 mmNo tolerance class

Try “M12x1.5-6g”, “M8” (coarse pitch assumed), “MJ6-4h6h”, or “Tr20x4-8H”. Add “-LH” for a left-hand thread.

Thread engagement (tap drill)

75%

Clearance fit

Calculated live

Pitch diameter (basic)22.051 mmAdd a tolerance class (e.g. -6g) for max/min limits

Basic dimensions

Major diameter: 24.000 mm
Pitch diameter: 22.051 mm
Minor diameter: 20.752 mm

Tap drill · 75% thread

Tap drill: 21.50 mm (21.564 mm calculated)
Clearance drill (normal): 25.00 mm (24.800 mm calculated)

Looking for a different size or family? Open the full calculator →