DIN 934 / BS4032 / BS4190 / BS3692 Hexagon nuts with metric coarse and fine pitch thread – Product classes A and B, Withdrawn, DIN EN ISO 4032, DIN EN ISO 8673. Hex nut are one of the most common nuts available and are used with anchors, bolts, screws, studs, threaded rods and on any other fastener that has machine screw threads. Hex is short for hexagon, which means they have six sides. James Hall Nasmith (1808-1890) patented a machine for milling hexagon by 1829. It was tooled to mill the six sides of a hex nut that was mounted in a six-way indexing machine.
Therefore Hex Nut are measured by the width of the hex shape and by their thread pitch. Bolts and hexagon nuts come in many different measurements and cannot be interchanged. Generally nut and bolt measurements come in either metric sizing or standard sizing.
- Wire – Uncoiled, straightened and cut to length.
- Cold forging – Molding the steel into the right shape at room temperature.
- Bolt head – Progressively formed by forcing the steel into various dies at high pressure.
- Threading – Threads are formed by rolling or cutting.
Futhermore a nut is a fastener that consists of a block with a threaded hole in the centre. Such as the hole contains ‘female’ threads that typically correspond to the ‘male’ threads of a bolt or screw. Nuts are used with their ‘mating’ bolt or screw to fasten materials together.
Hence The most common shape for a nut is hexagonal, as six sides provide more angles for a tool to approach from, although the corners can be more vulnerable to becoming rounded off over time which makes them less easy to use with tools. Square nuts can also be used but are less common.
Whereas Vibration or rotation can have the effect of loosening a nut over time and so different locking mechanisms can be used, including:
- Locking washers.
- Jam nuts or locking nuts.
- Thread-locking fluid.
- Oval-shaped threads.