Dimensional and assembly data for M22 Studs & Threaded Rods to DIN 939 / DIN 975. Includes head size and width across flats, clearance-hole and tapping-drill diameters, tightening torque per property class, and the sizes to step up or down to when the joint requires it.
M22 Dimensional Row (DIN 939 / DIN 975)
| Thread size | Pitch (mm) | Point type | Common lengths (mm) | Reference standard | Notes |
|---|---|---|---|---|---|
| M22 | 2.5 | M22 | 50~300 | DIN 939 | Stud, equal thread both ends |
Hole Sizes for M22
| Coarse-thread pitch (ISO 724) | 2.5 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 24 mm |
| Tapping drill, coarse thread | 19.5 mm |
Tightening Torque for M22
| Class 8.8 (dry, ~µ 0.125) | ≈ 573 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 816 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 954 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 M22
| Tensile stress area As (ISO 724) | 303 mm² |
|---|---|
| Proof load, class 8.8 | 182 kN |
| Proof load, class 10.9 | 252 kN |
| Proof load, class 12.9 | 294 kN |
| Min. ultimate tensile load, class 8.8 | 252 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.
Mating Parts for M22
For M22, pair with a M22 hex nut (ISO 4032 / DIN 934) and, where used, a M22 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Custom manufacturing · Made to drawing
Need studs & threaded rods in a size this table does not list?
This page covers M22 studs & threaded rods. A non-standard bolt is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
