1.Standards:ISO.DIN.GB.BS--2H 2.Material:stainless steel.carbon steel.HDG.steel 3.Size:M3-M80 4.high quality and low price GRADE:4.8,6.8,8.8,10.9,12.9SURFACE TREATMENT:BLACK Thread sizeM5M6M8M10M12M16M20Pitch0.811.251.51.7522.5m456.58101316e8.6310.8914.218.7220.8826.1732.95s8101317192430 Thread sizeM30M36M42M48M56Pitch3.544.555.5m2429343845e50.8560.7971.382.693.56s4655657585