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Metric Steel Bolts - Grades and Property Classes

Metric steel bolts, screws and studs - proof and tensile strength.

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For metric bolts strength is according ISO 898 Mechanical properties of fasteners made of carbon steel and alloy steel described by "property classes" with designations 4.6, 4.8, 5.8, 8.8, 9.8, 10.9 and 12.9.

Property Class	Head Marking	Size Range (mm)	Minimum Proof Strength (10⁶ Pa)	Minimum Tensile Strength (10⁶ Pa)	Material
4.6		M5 - M36	225	400	Low or medium carbon steel
4.8		M1.6 - M16	310	420	Low or medium carbon steel
5.8		M5 - M24	380	520	Low or medium carbon steel
8.8		M1.6 - M36	600	830	Medium carbon steel, Q & T
9.8		M1.6 - M16	650	900	Medium carbon steel, Q & T
10.9		M5 - M36	830	1040	Low carbon martensite steel, Q & T
12.9		M1.6 - M36	970	1220	Alloy steel, Q & T

1 Pa = 1 N/m² = 1.4504x10^-4 lb/in² (psi)

Metric Bolts - Minimum Ultimate Tensile and Proof Loads

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