Lock Nuts - UNC Left Hand

Sometimes written as lock nuts, they also go by various other names, including half nuts, jam nuts and thin nuts.

Locknuts are used to lock a full nut in position to prevent it from working loose as a result of vibration or other factors. A common area in which lock nuts are used is on car wheels.

Locknuts are often mixed up with Nyloc nuts, which are different. Nyloc nuts are self-locking nuts that feature a nylon collar in the top portion of the nut that locks the nut in place.

About UNC Left Hand Thread

UNC stands for Unified National Coarse. It is a common imperial thread type with less threads per axial distance than its UNF equivalent.

Unified thread types (UNF and UNC) were introduced at the beginning of World War 2 to enable the interchangeability of machinery manufacturing between the USA, Canada and Great Britain. Still commonly found on a vast array of old machines and vehicles in the UK, UNF and UNC threads continue to be the standard thread in the USA and Canada.

A left hand thread is the terms used for a thread where the nut tightens in the opposite direction to normal. It is commonly used on items that rotate in a manner that could cause a normal right handed nut to loosen, for a example the pedal of a bicycle on the left hand side.

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Code Product Name Info Pack Size Price Qty
5/16 LNUCSCL031 5/16" UNC Left Hand - Lock Nut Hexagon - Self Colour - Pack of 25
25
£17.64 £21.17
5/16 LNUCSCL031
5/16" UNC Left Hand - Lock Nut Hexagon - Self Colour - Pack of 25
25
£17.64 £21.17
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1 Item