Metric Steel Socket Head Cap Screws

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About Socket Head Screws

Alloy Steel Socket Head Screws

The standard for high-strength fastening.

Left-Hand Threaded Alloy
Steel Socket Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening.

18-8 Stainless Steel Socket Head Screws

Use these general purpose 18-8 stainless steel screws for a variety of fastening applications. They have good chemical resistance.

Cleaned and Bagged 18-8 Stainless Steel
Socket Head Screws for High Vacuum

Cleaned and double bagged in an ISO Class 5 (Fed. Std. Class 100) clean room, these screws are ready to use on chambers and components in high-vacuum systems.

Super-Corrosion-Resistant 316
Stainless Steel Socket Head Screws

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

High-Strength A286 Stainless
Steel Socket Head Screws

Often used to fasten parts in engines and turbines, these are our strongest stainless steel screws. They are comparable in strength to alloy steel with the corrosion resistance of 18-8 stainless steel.

High-Strength 316 Stainless
Steel Socket Head Screws

These screws are hardened to be 40% stronger than standard 316 stainless steel screws, yet they still have excellent corrosion resistance. Use them in chemical and marine applications.

Alloy Steel Low-Profile Socket Head Screws

Made of alloy steel, these low-profile screws are nearly twice as strong as their stainless steel counterparts. With half the height of a standard socket head, these low-profile screws fit in tight spaces.

18-8 Stainless Steel Low-Profile
Socket Head Screws

Nearly as strong as steel, these stainless steel screws won’t rust in outdoor, washdown, and other corrosive environments. With half the height of a standard socket head, these low-profile screws fit in tight spaces.

Super-Corrosion-Resistant 316 Stainless
Steel Low-Profile Socket Head Screws

More corrosion resistant than 18-8 stainless steel screws, these 316 stainless steel screws have excellent resistance to chemicals and salt water. Use these low-profile screws where space is limited.

Alloy Steel Ultra-Low-Profile Socket Head Screws

Made from alloy steel, these screws are nearly twice as strong as stainless steel low-profile screws. With a head height one-third the size of a standard socket head, they fit in the tightest spaces.

316 Stainless Steel Ultra-Low-Profile
Socket Head Screws

More corrosion resistant than 18-8 stainless steel screws, these 316 stainless steel screws have excellent resistance to chemicals and salt water. Their ultra-low-profile lets them fit in the tightest spaces.

Alloy Steel Thread-Locking Socket Head Screws

With a tensile strength of 170,000 psi, these alloy steel screws are among the strongest we carry. They are stronger than Grade 8 steel screws and are nearly two and a half times stronger than stainless steel thread-locking screws. They have a thread locker to prevent loosening from vibration.

18-8 Stainless Steel Thread-Locking
Socket Head Screws

These screws have good chemical resistance. A thread locker bonded to the threads prevents loosening from vibration.

Flanged Socket Head Screws

These general purpose flanged screws distribute pressure where the screw meets the surface, eliminating the need for a washer.

Serrated-Flange Socket Head Screws

Serrations under the head grip the material's surface for mild vibration resistance. The flange distributes pressure across the material's surface, eliminating the need for a washer.

Vented Socket Head Screws

Drilled through the head and shaft, these screws vent fluid and gases trapped below the screw, making them good for vacuum applications.

High-Vacuum Cleaned-and-Bagged
Vented Socket Head Screws

Fasten these screws inside a high-vacuum system without bringing in contaminants.

Sealing Socket Head Screws

A rubber O-ring under the head of these screws prevents leaks and seals out contaminants.

Socket Head Screws with Flat Washer

A freely rotating washer distributes pressure over a wider area than a flange, preventing damage to your material's surface.

Vibration-Resistant Sealing Socket Head Screws

The nylon patch bonded to the threads of these socket head screws adds friction to keep vibration from loosening them, while their O-ring prevents leaks and seals out contaminants.

Socket Head Captive Panel Screws

Install these socket head screws through a hole and thread on a retainer to keep secure—no special tools are required.