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Lock nut | Metric thread | Strength class 4 | Zinc coating Zn
The low-profile hex nut to DIN 439 is a fastener with a reduced height, designed for metric threaded connections. Due to its design, it is often used as a lock nut, a support nut or in situations where limited installation space prevents the use of a standard hexagon nut.
The product is made of steel in strength class 4 and has a zinc coating. The zinc coating reduces the risk of corrosion under typical operating conditions, whilst the hexagonal shape allows for quick assembly using standard flat-bladed, ring or socket spanners.
The DIN 439 low-profile nut is compatible with bolts, threaded rods and other components with metric threads of the appropriate size. It is a practical solution for assemblies requiring securing, adjustment or a limited overall height of the assembly.
| Thread | m max. [mm] | S DIN/ISO [mm] |
|---|---|---|
| M2 | 1.2 | 4 |
| M2.5 | 1.6 | 5 |
| M3 | 1.8 | 5.5 |
| M3.5 | 2.0 | 6 |
| M4 | 2.2 | 7 |
| M5 | 2.7 | 8 |
| M6 | 3.2 | 10 |
| M8 | 4.0 | 13 |
| M10 | 5.0 | 17 / 16 |
| M12 | 6.0 | 19 / 18 |
| M14 | 7.0 | 22 / 21 |
| M16 | 8.0 | 24 |
| M18 | 9.0 | 27 |
| M20 | 10.0 | 30 |
| M22 | 11.0 | 32 / 34 |
| M24 | 12.0 | 36 |
| M27 | 13.5 | 41 |
| M30 | 15.0 | 46 |
| M33 | 16.5 | 50 |
| M36 | 18.0 | 55 |
| M42 | 21.0 | 65 |
| M48 | 24.0 | 75 |
Dimensions are given in millimetres. In the ‘S DIN/ISO’ column, the first value indicates the width across flats according to DIN, and the second value indicates the corresponding ISO dimension, where there is a difference.
The DIN 439 Class 4 galvanised low-profile nut is a practical fastener for standard metric connections, locknuts and applications with limited installation space. A wide range of sizes from M2 to M48 allows you to select the right variant for assembly, installation, workshop and industrial applications.
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