Din 933 Cap Screws | McMaster-Carr

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About Hex Head Screws and Bolts

Medium-Strength Metric Class
8.8 Steel Hex Head Screws

Choose these metric screws for fastening most machinery and equipment. They are twice as strong as low-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.

Extreme-Strength Metric Class
12.9 Steel Hex Head Screws

Choose these metric screws for heavy duty stamping applications as well as earth-moving machinery, such as bulldozers and excavators. These screws are 10% stronger than our high-strength metric steel screws.

18-8 Stainless Steel Hex Head Screws

The standard choice for fastening in wet and outdoor conditions. Made of 18-8 stainless steel, these screws resist corrosion from mild chemicals and water.

Super-Corrosion-Resistant 316
Stainless Steel Hex Head Screws

More corrosion resistant than 18-8 stainless steel screws, these 316 stainless steel screws have excellent resistance to chemicals and salt water.

Super-Corrosion-Resistant High-Strength
Bumax 88 Hex Head Screws

Choose these screws for their excellent corrosion resistance—comparable to 316 stainless steel—and the strength of steel. Use them for high-strength fastening in chemical and marine applications.

Brass Hex Head Screws

Brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Aluminum Hex Head Screws

Aluminum screws are one-third the weight of steel and have good corrosion resistance.

Medium-Strength Metric Class 8.8 Steel
Thread-Locking Hex Head Screws

These Class 8.8 steel screws are suitable for fastening most machinery and equipment. They are over 50% stronger than stainless steel thread-locking screws. For vibration resistance, they have a thread locker bonded to the threads.

Tight-Spot Hex Head Screws

A high-strength alternative to blind rivets, use these screws when only one side of the material is accessible.

Fastener Assortments

Fastener Maintenance Assortments

Hex Head Screw Assortments

These assortments include hex head screws and hex nuts.

About Hex Head Screws and Bolts

Hex Head Screws

Medium-Strength Metric Class8.8 Steel Hex Head Screws

High-Strength Metric Class10.9 Steel Hex Head Screws

Extreme-Strength Metric Class12.9 Steel Hex Head Screws

18-8 Stainless Steel Hex Head Screws

Super-Corrosion-Resistant 316Stainless Steel Hex Head Screws

Super-Corrosion-Resistant High-StrengthBumax 88 Hex Head Screws

Brass Hex Head Screws

Aluminum Hex Head Screws

Medium-Strength Metric Class 8.8 SteelThread-Locking Hex Head Screws

Tight-Spot Hex Head Screws

Fastener Assortments

Fastener Maintenance Assortments

Hex Head Screw Assortments

Medium-Strength Metric Class
8.8 Steel Hex Head Screws

High-Strength Metric Class
10.9 Steel Hex Head Screws

Extreme-Strength Metric Class
12.9 Steel Hex Head Screws

Super-Corrosion-Resistant 316
Stainless Steel Hex Head Screws

Super-Corrosion-Resistant High-Strength
Bumax 88 Hex Head Screws

Medium-Strength Metric Class 8.8 Steel
Thread-Locking Hex Head Screws