This standard specifies the structural and dimensional requirements for titanium alloy smooth tolerances with blunt short threads of 100 degrees and countersunk head bolts (hereinafter referred to as butterfly bolts). This standard applies to mechanical connections.
HB 8270-2002 history
2003HB 8270-2002 Titanium alloy shank tolerance zone f9 short-thread 100° countersunk head screw