M27 Studs & Threaded Rods (DIN 939 / DIN 975) are specified by thread size, length and head dimensions. The M27 row from the standard is reproduced below, followed by the drill sizes, spanner size and torque values used when installing this size.
M27 Dimensional Row (DIN 939 / DIN 975)
| Thread size | Pitch (mm) | Point type | Common lengths (mm) | Reference standard | Notes |
|---|---|---|---|---|---|
| M27 | 3.0 | M27 | 55~300 | DIN 939 | Stud, equal thread both ends |
Hole Sizes for M27
| Coarse-thread pitch (ISO 724) | 3 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 30 mm |
| Tapping drill, coarse thread | 24 mm |
Tightening Torque for M27
| Class 8.8 (dry, ~µ 0.125) | ≈ 1064 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 1516 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 1774 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 M27
| Tensile stress area As (ISO 724) | 459 mm² |
|---|---|
| Proof load, class 8.8 | 276 kN |
| Proof load, class 10.9 | 381 kN |
| Proof load, class 12.9 | 446 kN |
| Min. ultimate tensile load, class 8.8 | 381 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 M27
For M27, pair with a M27 hex nut (ISO 4032 / DIN 934) and, where used, a M27 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 M27 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.
