The M5 size of Hex Weld Nuts with Flange is dimensioned by ISO 21670. 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.
M5 Dimensional Row (ISO 21670)
| Size | Pitch P (mm) | b (mm) | c (mm) | d_a (mm) | d_c (mm) | Width across corners e (mm) | f (mm) | g (mm) | m_min (mm) | Nut height m (mm) | Width across flats s (mm) | r_1 (mm) | r_2 (mm) | m1000 (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M5 | 0.8 | 2.2 | 0.8 | 6 | 15.5 | 8.2 | 1.7 | 4 | 4.7 | 5 | 8 | 0.6 | 0.3 | 2.9 | ISO 21670 |
Spanner & Drive for M5 Hex Weld Nuts with Flange
Drive geometry for M5 Hex Weld Nuts with Flange is given by the row above; match the tool to the listed values.
Tightening Torque for M5
| Class 8.8 (dry, ~µ 0.125) | ≈ 5.9 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 8.7 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 10 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 M5
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 M5 Hex Weld Nuts with Flange
- At M5 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
When to Step Up or Down from M5
When the joint preload approaches the proof load of M5 class 8.8, step up to M6 class 8.8 (or move to M5 class 10.9). When the joint is over-specified, M4 often saves weight and cost without losing the safety margin.
Custom manufacturing · Made to drawing
Need hex weld nuts with flange in a size this table does not list?
This page covers M5 hex weld nuts with flange. 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.
