material:carbon steel or stainless steel or Aluminum
head type:pan\flat\oval\binding\truss\hexalobular\hex-soc\HW\PW and
so on
thread type:mechanical \M-S\triangle mechnical teeth\self-tapping
with sharp tail or mill tail or horizontal tail or B-Sor B*2S or
B-C\B*2C\the pin pineapple flower\the pin slubby flower and so
on
trough type:Y\H\Philips\Z\Slotted\CT\six-lobe and so on
standard:JIS\ANSI\DIN and so on.
Finish:Zinc3+yellow,blue,iridescent,white,black,Niw,passivation,Dacrotized,
