Metric Lock Nuts

DIN 439 

DIN 936

Materials and Finishes:

Steel/Zinc & clear

Stainless steel/Self colour

Brass/Self colour

Note: Due to the fact that fastening applications differ greatly, the below information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.

Dimension data
 dM3M4M5M6M8M10M12M14 (1)M16 (1)M18 (1)M20 (1)M24 (1)M30 (1)
DIN 439m(max)


 dM3M4M5M6M8M10M12M14 (1)M16 (1)M18 (1)M20 (1)M24 (1)M30 (1)
DIN 936m(max)----56788991012

1 - Non-preferred  

NB: Generally our preferred stock is either DIN 439 or DIN 936 depending on size. If m or s dimensions are critical to your application you should check with us prior to ordering.

Technical Support Articles
Thread Geometry - Metric Coarse Threads
Tightening Factors & Tolerances
Torque data - Steel fasteners - Standard metric threads
Mechanical properties - Metric steel nuts
Preferred range
Preferred Range
Thread (d)M3ST  A2  A4  BR
M4ST  A2  A4  BR
M5ST  A2  A4  BR
M6ST  A2  A4  BR
M8ST  A2  A4  BR
M10ST  A2  A4  BR
M12ST  A2  A4  BR
M16ST  A2  A4
M20ST  A2  A4

ST - Steel, Zinc & Clear - other finishes often available

A2 - A2 Stainless Steel, Self colour

A4 - A4 Stainless Steel, Self colour

BR - Brass, Self Colour

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