ASTM F568 Specification Suppliers, Manufacturers

ASTM F568 is standard Specification for metric size  bolts, screws and studs that are used in general engineering applications. It is officially titled: Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners. It defines mechanical properties for fasteners that range from M1.6 to 100 in diameter

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Grades Material Description

Markings & Mechanical Prperties

Markings & Mechanical Prperties
Grades	Markings	Size Range	PS [MPa]	YS (min) [MPa]	TS (min) [MPa]	Hardness [Rockwell]
Class 4.6		5–100	225	240	400	B67–95
Class 4.8		1.6–16	310	340	420	B71–95
Class 5.8		5–24	380	420	520	B82–95
Class 8.8		0.050%	600	660	830	C23–34
Low carbon Class 8.8		17–72	600	660	830	C23–34
Class 8.8.3		17–72	600	660	830	C23–34
Class 9.8		1.6–16	650	720	900	C27–36
Low carbon Class 9.8		1.6–16	650	720	900	C27–36
Class 10.9		5–100	830	940	1040	C33–39
Low Carbon Class 10.9		5–100	830	940	1040	C33–39
Class 10.9.3		5–100	830	940	1040	C33–39
Class 12.9		1.6–100	970	1100	1220	C38–44