ASTM F3393 Hex Head Screws

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About Hex Head Screws and Bolts

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

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.

High-Strength Grade 8 Steel
Flanged 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. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Low-Strength Steel Flanged Hex Head Screws

About half as strong as medium-strength steel screws, these screws are best for light duty fastening applications, such as securing access panels. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

About Hex Head Screws and Bolts

Hex 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

High-Strength Grade 8 SteelFlanged Hex Head Screws

Low-Strength Steel Flanged Hex Head Screws

Medium-Strength Metric Class
8.8 Steel Hex Head Screws

High-Strength Metric Class
10.9 Steel Hex Head Screws

High-Strength Grade 8 Steel
Flanged Hex Head Screws