| Threads Per Inch: | 32 |
| Bolts Diameter: | 3/16" |
| Bolts Material: | Steel |
| Finish: | Self Colour |
| Head Type: | Socket Button |
| Thread Type: | Imperial - UNF |
| Length Under Head: | 1" |
| Tapping Drill Size: | 4.1mm |
UNF stands for Unified National Fine. It is a common imperial thread type with more threads per axial distance than its UNC 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.