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Cap Screws

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Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
The standard for high-strength fastening.
Mil. Spec. Alloy Steel Socket Head Screws
Mil. Spec. Alloy Steel Socket Head Screws
Choose these screws for their adherence to strict military standards for material and construction.
Torx Alloy Steel Socket Head Screws
Torx Alloy Steel Socket Head Screws
A Torx-Plus drive has more points of contact than a hex drive, allowing you to tighten these screws with less slippage or damage to the recess.
Left-Hand Threaded Alloy Steel Socket Head Screws
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.
High-Temperature Alloy Steel Socket Head Screws—Grade B7
High-Temperature Alloy Steel Socket Head Screws—Grade B7
These screws are specially tempered to meet ASTM A193 specifications for temperatures up to 1100° F.
18-8 Stainless Steel Socket Head Screws
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.
Mil. Spec. 18-8 Stainless Steel Socket Head Screws
Mil. Spec. 18-8 Stainless Steel Socket Head Screws
Choose these screws for their adherence to strict military standards for material and construction. Screws are 18-8 stainless steel for good chemical resistance.
Cleaned and Bagged 18-8 Stainless Steel Socket Head Screws for High Vacuum
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.
Left-Hand Threaded 18-8 Stainless Steel Socket Head Screws
Left-Hand Threaded 18-8 Stainless Steel Socket Head Screws
Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Made from 18-8 stainless steel, these screws have good chemical resistance.
Super-Corrosion-Resistant 316 Stainless Steel Socket Head Screws
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
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
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.
Plastic Socket Head Screws
Plastic Socket Head Screws
Plastic screws are chemical and oil resistant, nonconductive, and lightweight.
Brass Socket Head Screws
Brass Socket Head Screws
Brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.
Aluminum Socket Head Screws
Aluminum Socket Head Screws
Aluminum screws are one-third the weight of steel and have good corrosion resistance.
Titanium Socket Head Screws
Titanium Socket Head Screws
Our most corrosion-resistant metal screws, titanium screws withstand salt water, acids, and chemicals. They have a high strength-to-weight ratio and are about 40% lighter than steel screws.
Nickel Alloy Socket Head Screws
Nickel Alloy Socket Head Screws
More corrosion resistant than stainless steel screws, nickel alloy screws have excellent resistance to salt water and some acids.
Bronze Socket Head Screws
Bronze Socket Head Screws
Bronze screws are about 40% stronger than brass screws and provide more corrosion resistance to salt water, gases, and sewage. They are nonmagnetic and electrically conductive.
Alloy Steel Low-Profile Socket Head Screws
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
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
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
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
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.
High-Profile Socket Head Screws
High-Profile Socket Head Screws
With a head one and a half times taller than a standard socket head, these screws are easier to install in deep counterbored holes and other hard-to-reach places.
Flanged Socket Head Screws
Flanged Socket Head Screws
These general purpose flanged screws distribute pressure where the screw meets the surface, eliminating the need for a washer.
Exact-Grip-Length Flanged Socket Head Screws
Exact-Grip-Length Flanged Socket Head Screws
For use where sideways forces are a concern, these screws have a precisely measured unthreaded portion (grip) for a strong hold. Their flanged head distributes pressure where the screw meets the surface, so you don't need a washer.
Serrated-Flange Socket Head Screws
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.
18-8 Stainless Steel Thread-Locking Socket Head Screws
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.
Super-Corrosion-Resistant 316 Stainless Steel Thread-Locking Socket Head Screws
Super-Corrosion-Resistant 316 Stainless Steel Thread-Locking Socket Head Screws
More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. They have a thread locker to resist vibration.
Alloy Steel Thread-Locking Socket Head Screws
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.
Stainless Steel Wire-Lockable Socket Head Screws
Stainless Steel Wire-Lockable Socket Head Screws
Stainless steel screws have excellent corrosion resistance in most environments. Wire these screws together for more vibration resistance than other types of socket head screws.
Alloy Steel Wire-Lockable Socket Head Screws
Alloy Steel Wire-Lockable 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 more than twice as strong as stainless steel wire-lockable screws. These resist vibration better than any other socket head screw.
Stainless Steel Socket Head Screws with Split Lock Washer
Stainless Steel Socket Head Screws with Split Lock Washer
Stainless steel screws have excellent corrosion resistance in most environments. They have a split lock washer to create tension and resist loosening from vibration.
Alloy Steel Socket Head Screws with Split Lock Washer
Alloy Steel Socket Head Screws with Split Lock Washer
With a tensile strength of 180,000 psi, these alloy steel screws are among the strongest we carry. They are stronger than Grade 8 steel screws and more than two and a half times stronger than stainless steel screws with split lock washer. The split lock washer helps to resist vibration.
Vented Socket Head Screws
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
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
Sealing Socket Head Screws
Seal out contaminants and prevent leaks—a rubber O-ring under the head prevents leaks and seals out contaminants.
Socket Head Screws with Flat Washer
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
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.
Nylon-Tip Alloy Steel Socket Head Screws
Nylon-Tip Alloy Steel Socket Head Screws
Nonconductive and softer than brass, the nylon tip reduces vibration and eliminates damage from metal touching metal.
Brass-Tip Alloy Steel Socket Head Screws
Brass-Tip Alloy Steel Socket Head Screws
The nonmarring brass tip is electrically conductive and harder than nylon, but soft enough to conform to most surfaces and reduce damage from metal-on-metal contact.
Socket Head Screws for Square-Drive Wrenches
Socket Head Screws for Square-Drive Wrenches
No need for separate bits—these screws lock directly onto square-drive socket wrenches, reducing the risk of dropping parts during installation.
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