ISO 898-1 Screws | McMaster-Carr

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1,169 Products

About Hex Head Screws and Bolts

Alloy Steel Socket Head Screws

The standard for high-strength fastening.

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.

Left-Hand Threaded Medium-Strength
Metric Class 8.8 Steel Hex Head Screws

These metric screws help prevent counterclockwise-moving parts from loosening. Use them for medium-strength fastening.

High-Strength Metric Class 10.9
Steel Flanged Hex Head Screws

Use 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. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Medium-Strength Metric Class 8.8
Steel Flanged Hex Head Screws

Choose these metric screws for fastening most machinery and equipment. With a flange distributing pressure where the screw meets the surface, there is no need for a separate washer.

Medium-Strength Metric Class 8.8 Steel
Serrated-Flange Hex Head Screws

Twice as strong as low-strength steel screws, these Class 8.8 steel screws can be used to fasten most machinery and equipment. Serrations under the head grip the surface of your material to help resist vibration.

Serrated-Flange Thread-Locking Hex Head Screws

No need to hunt for a lock washer or apply messy threadlocker—these screws have serrations under the flange and adhesive on the threads to permanently hold them in place.

About Hex Head Screws and Bolts

Screws and Bolts

Alloy Steel Socket Head Screws

Medium-Strength Metric Class8.8 Steel Hex Head Screws

Left-Hand Threaded Medium-StrengthMetric Class 8.8 Steel Hex Head Screws

High-Strength Metric Class 10.9Steel Flanged Hex Head Screws

Medium-Strength Metric Class 8.8Steel Flanged Hex Head Screws

Medium-Strength Metric Class 8.8 SteelSerrated-Flange Hex Head Screws

Serrated-Flange Thread-Locking Hex Head Screws

Medium-Strength Metric Class
8.8 Steel Hex Head Screws

Left-Hand Threaded Medium-Strength
Metric Class 8.8 Steel Hex Head Screws

High-Strength Metric Class 10.9
Steel Flanged Hex Head Screws

Medium-Strength Metric Class 8.8
Steel Flanged Hex Head Screws

Medium-Strength Metric Class 8.8 Steel
Serrated-Flange Hex Head Screws