RS PRO A4 stainless steel hex nuts ideal for use in chemical processing equipment and marine environments due to its higher resistance to tarnish and corrosion. These 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.

Features and Benefits:
Metric hex nuts
To DIN934
A4 grade 18/8 stainless steel (Type 316 S16) – long lasting
Good resistance to corrosion and saltwater
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:
• 248-4551 – M2
• 248-4567 – M2.5
• 189-563 – M3
• 189-579 – M4
• 189-585 – M5
• 189-591 – M6
• 189-608 – M8
• 189-614 – M10
• 183-9045 – M12
• 248-4573 – M16
• 248-4589 – M20

Typical Applications:
Chemical processing equipment
Marine Environments
Automotive Applications
Construction Industry
General Industry
Machinery
Workshops

Standards
DIN 934

What is A2 Stainless Steel?

Stainless steel comes in many grades, the most popular being, A4 or 316 and A2 or 304. These two grades both offer excellent corrosion resistance, easy to clean and good resistance to extremely low and high temperatures. The difference between A2 and A4 is that A4 stainless steel has molybdenum added to it to help resist corrosion to chlorides such as sea water and de-icing salts making it better suited to extreme environments and exposure to chemical solutions. Stainless steel nuts, fasteners, screws and bolts are often manufactured from A4 or A2 stainless steel as the metal offers strong abrasion resistance, good resistance to corrosion and reliable low levels of distortion.

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