The M12 size of Hex Nuts with Collar, 1.5d Height is dimensioned by DIN 6331. The table below gives the dimensional row from the standard, followed by 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.
M12 Dimensional Row (DIN 6331)
| Size | Pitch P (mm) | a (mm) | d1 (mm) | damin (mm) | damax (mm) | Nut height m (mm) | Width across flats s (mm) | Note | Reference standard |
|---|---|---|---|---|---|---|---|---|---|
| M12 | 1.75 | 4 | 25 | 12 | 13 | 18 | 18 | DIN 6331 |
Spanner & Drive for M12 Hex Nuts with Collar, 1.5d Height
Drive geometry for M12 Hex Nuts with Collar, 1.5d Height is given by the row above; match the tool to the listed values.
Tightening Torque for M12
| Class 8.8 (dry, ~µ 0.125) | ≈ 84 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 124 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 145 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 M12
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.
Mating Parts for M12
Pair M12 with the matching M12 bolt or screw, plus a M12 flat washer where required to distribute load on softer materials.
When to Step Up or Down from M12
When the joint preload approaches the proof load of M12 class 8.8, step up to M16 class 8.8 (or move to M12 class 10.9). When the joint is over-specified, M10 often saves weight and cost without losing the safety margin.
Custom manufacturing · Made to drawing
Need hex nuts with collar, 1.5d height in a size this table does not list?
This page covers M12 hex nuts with collar, 1.5d height. Locking method is specifiable independently of the rest: nylon insert, all-metal deformed thread, serrated flange, or none. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
