|Threads Per Inch:||16|
|Head Type:||Low Head|
|Thread Type:||Imperial - UNC|
|Length Under Head:||1"|
|Tapping Drill Size:||8mm|
If there is a need to preserve more space, or even if it is for aesthetic reasons, a low head socket cap screw may be the answer. They are used not only on flat surfaces but also in counterbore holes so the head can be sunk in. There may not be enough room to have a full head depth counterbore, so a low head socket cap screw is then the most suitable option.
The same as a normal socket cap screw but simply with a reduced head. It still encompasses a hexagonal drive that is fastened with an Allen key or screwdriver with hexagonal insert bits.
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.