M30 x 200mm 3.50p Metric Coarse Hex Bolt High Tensile Class 12.9 Black

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Premium-grade hex bolts for secure fastening in construction and machinery. Durable, corrosion-resistant, and available in various sizes. Explore top-tier Class 4.6, 8.8, 10.9, and 12.9 metric hex bolts, alongside Grades 5 and 8 imperial hex bolts for unmatched fastening. Shop our selection for reliable, high-tensile fasteners.

Hex Bolt Finishes: Zinc Plated vs. Black Oxide

Finish on Hex Bolts: The finish of a hex bolt refers to its surface treatment, which enhances corrosion resistance, appearance, and durability.

Zinc Plated Finish: Zinc plating adds a protective zinc layer that guards against corrosion. It’s ideal for outdoor or moist environments due to its superior corrosion resistance. Common use cases include construction, automotive, and marine applications where the bolts are exposed to the elements.

Black Oxide Finish: Black oxide provides a black finish whilst maintaining corrosion resistance, primarily used for its visual appeal. It’s best for indoor applications where corrosion is less of a concern, such as in home appliances, electronics, and decorative installations.

Metric Class and Imperial Grade Strengths for Hex Bolts

When selecting hex bolts, understanding the strength differences between metric classes and imperial grades is crucial for ensuring the integrity of your project.

Metric Class Strengths:

Class 4.6: These bolts are made of low or medium carbon steel and have a minimum tensile strength of 400 MPa and a yield strength of 60% of the tensile strength. They are suitable for light applications where high strength is not required, such as securing furniture or light fixtures.
Class 8.8: A medium carbon steel bolt that’s been hardened and tempered, Class 8.8 has a tensile strength of 800 MPa and a yield strength of 80% of the tensile strength. These are appropriate for automotive applications, structural steelwork, and equipment manufacturing.
Class 10.9: These bolts are alloy steel, quenched and tempered, with a tensile strength of 1,000 MPa and a yield strength of 90% of the tensile strength. They’re used in high-stress applications like engine mounts, suspension systems, and heavy equipment where strength is critical.
Class 12.9: The highest metric class for strength, these alloy steel bolts have a tensile strength of 1,200 MPa and a yield strength of 90% of the tensile strength. They are used in precision machinery and applications where the highest strength is necessary, such as in the aerospace industry.

Imperial Grade Strengths:

Grade 5: These bolts are made from medium carbon steel and are quenched and tempered. They have a minimum tensile strength of 120 ksi and are suitable for automotive applications, OEM (original equipment manufacturer) service, and repair where moderate strength is sufficient.
Grade 8: Made from medium carbon alloy steel and heat-treated, these bolts have a higher tensile strength of 150 ksi. They are used in demanding applications such as vehicle suspensions, heavy equipment, and industrial machinery where high tensile strength is a must.