The Nut is a component of a fastening arrangement with a female
thread (on the inside). It normally has some shape or form on the
outside to assist with rotating it so that it will tighten onto a
male part and typically come in a right handed thread (tightened
when turned in a clockwise direction). Note that some nuts are
available that are left hand threaded (tightened when turned
Hex Nuts are the most commonly used nut for all types of
fastenings. They are available in metric coarse thread (standard),
metric fine threads, Unified National Coarse (UNC), Unified
National Fine (UNF) and British Standard Whitworth (BSW). Metric
sizes are made to the DIN 934 standard.
Similar and complimentary to the hexagon range, the major
difference being the nylon ring inserted at the end of the nut.
This is a self-locking device to stop the nut undoing under
constant vibration or load variations. It is not suitable for use
where the temperature is liable to exceed 120 degrees Celsius. For
uses where high temperatures are incurred a range of spring metal
lock nuts are available in 304 grade only. Metric sizes are made to
the DIN 985 standard.
(Acorn or Cap Nuts) come in two styles, one piece or two piece. A
one piece Dome Nut is made from a solid piece of stainless to DIN
1587 Standards and the two piece is a hexagon nut with a dome cap
fused to one end and made with a high polish finish.
Lock Nuts, Half Nuts or Jam Nuts
These are used under a Hex Nut or another Lock Nut to lock the
fastening and stop it from undoing. They are similar to a Hex Nut
but not as high and in metric sizes are made to the DIN 439
The range and grades are similar to the hexagon nuts. These nuts
are used in situations where a fastening is often undone and done
up but does not require an over tight fitting. The pressure that
can be exerted by your fingers is sufficient to hold the
These are internally threaded but with a round outside and with a
small reduced diameter shoulder. Designed for welding into sheet
metal fabrications so that a fastening can be used to hold firmly
in the sheet product.
These are very long hexagon nuts that are used to join two long
threads together and are made to DIN 6334 standard.
Used mainly on concrete retaining type fastenings and automotive or
sheetmetal fabrications. They are made for sheetmetal punching and
are designed so that the 4 prongs and body come through from the
back of timber and hold to stop the nut from rotating. They are
mainly used in furniture/upholstery work.
Barrel Nuts have a long internal female thread and one end closed
with a drive. Either Philips, Slot or Socket.
Bumax Nuts are a range of higher tensile Stainless Steel hexagon
For Australian customers see Stainless