Description
Cap Screws Flat Socket 316 Stainless 5/16-18 x 3 are high-strength, corrosion-resistant fasteners designed for secure, flush mounting in demanding environments. Made from 316 stainless steel, these flat socket cap screws deliver excellent durability and reliability in marine, outdoor, and industrial applications.
Key features
- Material: 316 stainless steel for superior corrosion resistance and toughness.
- Head style: Flat socket cap screw for a low-profile, flush appearance.
- Thread size: 5/16-18 UNC coarse thread for broad compatibility.
- Length: 3 inches overall (length measured from under the head to the end of the screw).
- Finish: Passivated surface to enhance corrosion resistance and ease of maintenance.
These cap screws provide reliable performance in demanding conditions, including saltwater exposure, chemical environments, and high-vibration systems. Their flat socket head sits flush against the substrate, reducing snag hazards and allowing for clean, professional assemblies.
Applications
- Marine and boat fittings
- Industrial machinery and equipment
- Automotive and automotive repair
- Racks, enclosures, and outdoor installations
Why choose 316 stainless steel? 316 stainless offers excellent corrosion resistance in chloride-containing environments, making these screws a durable choice for coastal facilities, laboratories, and harsh settings where ordinary steel would corrode.
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800-222-0324

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