Reduced shank
Normal shank
Shoulder
Waisted shank
Full thread
Dog point
Semitubular end
T-shape end
Cone point
UNI 5909
Studs with a length of engagement equal to about 1d
UNI 5911
Double end studs b1=1.5d—Type A
UNI 5914
Studes with a length of engagement equal to about 2d