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8.8 Zinc Plated Steel High Tensile Bolts

High tensile bolts are produced from steel with a lower than usual carbon content that has been alloyed with other materials, such as chromium or molybdenum, to improve the material's strength properties.

High tensile bolts with metric threads are generally available in three different grades or 'classes' starting at 8.8, through to 10.9 and then 12.9 and sometimes beyond. These numbers refer to the bolt's minimum tensile strength and then the yield strength. High tensile bolts and nuts will be marked with this strength grade.

Other thread standards employ their own high tensile strength grading rationale.

Fastener Material Key
BO-10.9
Black Oxide High Tensile Steel Class 10.9 - A high tensile non-stainless grade with a black oxide finish offering limited corrosion resistance.
BO-12.9
Black Oxide High Tensile Steel Class 12.9 - A high tensile non-stainless grade with a black oxide finish offering limited corrosion resistance.
BZP-10.9
Bright Zinc Plated (BZP) Class 10 High Tensile Steel - A high strength non-stainless grade for screws and bolts, with a basic level of corrosion resistance.
BZP-12.9
Bright Zinc Plated (BZP) Class 12 High Tensile Steel - A higher tensile non-stainless grade for screws and bolts, with a basic level of corrosion resistance.
BZP-8.8
Bright Zinc Plated (BZP) Class 8 High Tensile Steel - The general purpose high tensile grade for screws and bolts, with a basic level of corrosion resistance.
BZP-G5
Bright Zinc Plated (BZP) USA Grade 5 High Tensile Steel - Equivalent to ISO class 8, a general purpose high tensile grade with a basic level of corrosion resistance.
ZnFlk-10.9
Organic Zinc Flake Coated Class 10 High Tensile Steel - A higher tensile non-stainless grade for screws and bolts. Coated with superior mechanically applied zinc with corrosion resistance lasting 480 hours in the salt spray test.
ZnFlk-12.9
Organic Zinc Flake Coated Class 12 High Tensile Steel - A higher tensile non-stainless grade for screws and bolts. Coated with superior mechanically applied zinc with corrosion resistance lasting 480 hours in the salt spray test.

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