M39 Self-Locking Counter Nuts are manufactured to DIN 7967. This page lists the controlling dimensions for the M39 size together with the drive and the installation notes for this type.
Values are taken from the governing standard rather than from a general machine-thread table, because this type is not selected on one.
M39 Dimensional Row (DIN 7967)
| Size | od (mm) | id (mm) | Nut height m (mm) | Width across flats s (mm) | t (mm) | Reference standard |
|---|---|---|---|---|---|---|
| M39 | 39 | 35.2 | 9 | 60 | 1.3 | DIN 7967 |
Spanner & Drive for M39 Self-Locking Counter Nuts
Drive geometry for M39 Self-Locking Counter Nuts is given by the row above; match the tool to the listed values.
Tightening Torque for M39
| Class 8.8 (dry, ~µ 0.125) | ≈ 3265 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 4650 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 5442 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 M39
Nuts are graded to ISO 898-2 by the proof load the nut itself will hold (classes 04, 05, 5, 6, 8, 10 and 12), not by the 8.8 / 10.9 / 12.9 scale used for bolts. A class-8 nut is the correct mate for a class-8.8 bolt, and the joint is designed on the bolt, so no bolt-tension figure is quoted here.
Installation Tips for M39 Self-Locking Counter Nuts
- At M39 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 M39
Pair M39 with the matching M39 bolt or screw, plus a M39 flat washer where required to distribute load on softer materials.
Custom manufacturing · Made to drawing
Need self-locking counter nuts in a size this table does not list?
This page covers M39 self-locking counter nuts. Thread size is the obvious variable and rarely the interesting one — height for clearance, across-flats for the tool already in the cell, and the locking feature for the vibration actually present. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
