Screw
Metric

Screw

Section Title: Metric
Table Section Text: None

Head markings and properties for metric hex-head cap screws

Head marking	Grade, material and condition	Nominal size range (mm)	Proof strength	Yield strength, min.	Tensile strength, min.	Core hardness (Rockwell)

MPa	ksi	MPa	ksi	MPa	ksi

-	Class 3.6	1.6–36	180	26	190	28	330	48	B52–95

-	Class 4.6 Low or medium carbon steel	5–100	225	32.6	240	35	400	58	B67–95

-	Class 4.8 Low or medium carbon steel; fully or partially annealed	1.6–16	310	45	340	49	420	61	B71–95

-	Class 5.8 Low or medium carbon steel; cold worked	5–24	380	55	420	61	520	75	B82–95

-	Class 8.8 Medium carbon steel; quench and tempered	Under 16 (inc.)	580	84	640	93	800	120

17–72	600	87	660	96	830	120	C23–34

-	Class 8.8 low carbon Low carbon boron steel; quench and tempered

-	Class 8.8.3 Atmospheric corrosion resistant steel; quench and tempered

-	ASTM A325M - Type 1 Medium carbon steel; quench and tempered	12–36

-	ASTM A325M - Type 3 Atmospheric corrosion resistant steel; quench and tempered

-	Class 9.8 Medium carbon steel; quench and tempered	1.6–16	650	94	720	104	900	130	C27–36

-	Class 9.8 low carbon Low carbon boron steel; quench and tempered

-	Class 10.9 Alloy steel; quench and tempered	5–100	830	120	940	136	1,040	151	C33–39

-	Class 10.9 low carbon Low carbon boron steel; quench and tempered

-	Class 10.9.3 Atmospheric corrosion resistant steel; quench and tempered

-	ASTM A490M - Type 1 Alloy steel; quench and tempered	12–36

-	ASTM A490M - Type 3 Atmospheric corrosion resistant steel; quench and tempered

-	Class 12.9 Alloy steel; quench and tempered	1.6–100	970	141	1,100	160	1,220	177	C38–44

-	A2 Stainless steel with 17–19% chromium and 8–13% nickel	up to 20	210 minimum 450 typical	30 minimum 65 typical	500 minimum 700 typical	73 minimum 100 typical

ISO 3506-1 A2-50 304 stainless steel-class 50 (annealed)	210	30	500	73

ISO 3506-1 A2-70 304 stainless steel-class 70 (cold worked)	450	65	700	100

ISO 3506-1 A2-80 304 stainless steel-class 80	600	87	800	120

Sentence(s)

The standard properties for Screw metric is produced from carbon steels and from corrosion resistant steels.

final_sentence: The standard properties for Screw metric is produced from carbon steels and from corrosion resistant steels.