A.Form C by 2~3 Threads Chamfering
From M5 with oil flutes
Tin Coating
DIN 371: Art. No. 4060/80
DIN 376: Art. No. 6060/80
JIS B0251/5: K9777/80 also called B type
B.Form D by 4~5 Threads Chamfering
From M5 with oil flutes
Tin Coating
DIN 371: Art. No. 4063/80
DIN 376: Art. No. 6063/80
JIS B0251/5: K9666/80 also called P type especially 
for Through holes mass production.