Threads are Unified National Fine (UNF).
10UNF - 32tpi; allen key size 5/32".
1/4UNF - 28tpi; allen key size 3/16".
5/16UNF - 24tpi; allen key size 1/4".
3/8UNF - 24tpi; allen key size 5/16".
7/16UNF - 20tpi; allen key size 3/8".
Bolt lengths do not include the head.
Longer bolts are partially threaded, we are happy to clarify prior to purchase.
Threaded length is calculated by 2 x thread diameter +12mm (approximately).
Manufactured from A2 grade stainless steel for improved corrosion resistance.