Unified Thread Data

Unified Thread Series (UTS) is a set of thread forms most commonly used in North America. As you would expect most American bikes use these threads. Influenced by the number of bikes being exported in the 1960’s a lot of British manufacturers started using them as well.

Thread form

UTS nuts, bolts and screws all use the same thread form as shown here. It is the same 60 degree thread angle as ISO Metric threads but uses a number of Teeth Per Inch (TPI) rather than a pitch in mm.

Unified National Fine (UNF)

You are most likely to find these on bolts, studs, nuts and anywhere that both male and female threads are in steel.

Unified National Coarse (UNC)

As with BSW threads on earlier bikes you are most likely to find these coarse threads in aluminium.