Armor-Coated Cap Screws | McMaster-Carr

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About Hex Head Screws and Bolts

Alloy Steel Socket Head Screws

The standard for high-strength fastening.

Medium-Strength Grade 5 Steel Hex Head Screws

Twice as strong as low-strength steel screws, these Grade 5 screws are suitable for fastening most machinery and equipment.

Medium-Strength Metric Class
8.8 Steel Hex Head Screws

Twice as strong as low-strength steel screws, these metric Class 8.8 steel screws can be used to fasten most machinery and equipment.

High-Strength Grade 8 Steel Hex Head Screws

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws.

High-Strength Metric Class
10.9 Steel Hex Head Screws

Choose these Class 10.9 steel screws for high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws.

About Hex Head Screws and Bolts

Screws and Bolts

Alloy Steel Socket Head Screws

Medium-Strength Grade 5 Steel Hex Head Screws

Medium-Strength Metric Class8.8 Steel Hex Head Screws

High-Strength Grade 8 Steel Hex Head Screws

High-Strength Metric Class10.9 Steel Hex Head Screws

Medium-Strength Metric Class
8.8 Steel Hex Head Screws

High-Strength Metric Class
10.9 Steel Hex Head Screws