Form A
6-8 Threads Lead,
for short through holes

 

Form B
4-5 Threads Lead with Spiral Point,
for through holes

 

Form C
2-3 Threads Lead,
for blind holes

 

Form D
4-5 Threads Lead,
for through and blind holes

 

Form C/35° RSP
2-3 Threads Lead,
35° Spiral Flute, for blind holes

 

Form B-AZ
4-5 Threads Lead with Spiral Point and interrupted threads for through holes