M24 is one of the standard coarse-thread sizes for hex bolts, fine pitch under ISO 8765. The sections below reproduce the dimensional row, list the matching tools and hole sizes, and summarize where this size is normally specified.
M24 Dimensional Row (ISO 8765)
| Size | Fine pitch (mm) | Width across flats s (mm) | Head height k (mm) | Stress area As (mmu00b2) | Common length range (mm) | Property class | Reference standard |
|---|---|---|---|---|---|---|---|
| M24 | 2.0 | 36.0 | 15.0 | 384.0 | 60~240 | 8.8 / 10.9 | ISO 8765 |
Spanner & Drive for M24 Hex Bolts, Fine Pitch
Drive geometry for M24 Hex Bolts, Fine Pitch is given by the row above; match the tool to the listed values.
Hole Sizes for M24
| Coarse-thread pitch (ISO 724) | 2 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 26 mm |
| Tapping drill, coarse thread | 22 mm |
Tightening Torque for M24
| Class 8.8 (dry, ~µ 0.125) | ≈ 792 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 1127 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 1319 Nm |
Indicative dry-joint values. Lubrication can lower the required torque by 15–25%. Always confirm against the joint design, especially when going up a strength class.
Proof Load & Strength for M24
| Tensile stress area As (ISO 724) | 384 mm² |
|---|---|
| Proof load, class 8.8 | 231 kN |
| Proof load, class 10.9 | 319 kN |
| Proof load, class 12.9 | 373 kN |
| Min. ultimate tensile load, class 8.8 | 319 kN |
Proof load = tensile stress area × the proof stress Sp of the class, per ISO 898-1 — Sp is a lower figure than the yield stress Rp0.2 and the two are not interchangeable. The stress area is computed from this size's own diameter and pitch, so a fine-pitch designation gives the fine-pitch figure. Design the joint so the working preload stays below the proof load of the class selected.
M24 Hex Bolts, Fine Pitch Weight
A steel M24 hex bolts, fine pitch at the listed 60,240 mm length weighs approximately 214,060 g each — about 214,060 kg per 1,000 pieces. Stainless A2/A4 weighs roughly the same (density 7.9–8.0 g/cm³).
Actual weight varies slightly with head form, thread and finish; use this figure for freight estimation only.
Installation Tips for M24 Hex Bolts, Fine Pitch
- At M24 the stretch in the bolt becomes the controlling factor — for critical joints, use angle-controlled or stretch-controlled tightening instead of pure torque.
Mating Parts for M24
For M24, pair with a M24 hex nut (ISO 4032 / DIN 934) and, where used, a M24 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Custom manufacturing · Made to drawing
Need hex bolts, fine pitch in a size this table does not list?
This page covers M24 hex bolts, fine pitch. Material and finish are usually what drives a special — a grade the standard part is not stocked in, or a coating chosen against a salt-spray figure instead of a default. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
