RS PRO, Plain Stainless Steel Hex Nut, DIN 439B, M20

The RS PRO A2 stainless steel locking half nuts have been designed for you to use when a nut has to be locked without clamping against another object.
Hex nuts are the most common hexagonal fastener that has internal threads that screw on to the shank of a bolt or a hex cap screw.

Good resistance to corrosion
Value for money
Half the height of normal nuts
Due to the hexagon nut having six sides it makes it easier to work with and is very versatile
Easy to tighten and loosen
Accessible from 360 degrees due to their shape


These RS PRO hex nut fasteners come in various thread sizes:
122-4399 – M2.5
122-4400 – M3
122-4401 – M4
122-4402 – M5
122-4403 – M6
122-4404 – M8
122-4405 – M10
122-4406 – M12
122-4407 – M16
122-4408 – M20

Use as locking nut
Use in manufacturing sectors such as the food industry
Automotive Applications
Construction Industry
General Industry
Machinery
Workshops
DIY enthusiasts
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What is A2 Stainless Steel?

Stainless steel comes in many grades, the most popular being, A2 stainless steel which is a corrosion resistant steel also known as 304. The other common grade of stainless steel is A4 or 316. A2 stainless steel is often used in the food and catering industries. Stainless steel nuts, fasteners, screws and bolts are often manufactured from A2 stainless steel as the metal offers strong abrasion resistance, good resistance to corrosion and reliable low levels of distortion.

If A2 stainless steel is not what you are looking for, we also have the locking half nut in A4 stainless steel.

DIN 439 – Hexagon thin nuts

Please note IMDS is not a regulatory requirement and is currently not supported by RS PRO