The national standard of T-type bolts is:
GB/T 2165-1991 fixture parts and Components T-groove quick-Release bolts (voided) adjusted to/8007.2-1995, after being/8007.2-1999| machine Tool Fixture parts and components T-groove quick-release bolts instead
GB/T 37-1988 tee bolts
There is also the mechanical standard:/1709-1991 T-type bolts (has been voided), by the/1700-2008 valve parts nut, bolts and plug replacement.
At present, the commonly used DIN186 T-type square neck bolts, GB GB37, din188t type double neck bolts, materials have carbon steel, stainless steel, alloy steel, and so on, the specifications from the m8-m64, quality control better domestic hardware production-mu Sheng, has formed a mature process.