5/16-18 SS 18-8 Cap Nut

Description

5/16-18 Stainless Steel 18-8 Cap Nut is a high-quality, durable fastener that offers greater corrosion resistance than nickel alternatives, often used in moisture-exposed, exterior, or corrosive environment applications.

Cap nuts have a dome-shaped top, a hexagonal base, and a fully threaded interior that closes at one end. Their six-sided base allows for easy tightening with standard wrenches and sockets, and the stainless steel construction provides reliable performance in demanding environments while maintaining a clean, finished appearance.

Stainless Steel (SS) 18-8

• Stainless Steel 18-8 cap nuts have a higher corrosion resistance than nickel alternatives
• These are often used around moisture, chemicals, or saltwater, and in applications requiring a clean, polished appearance with long-term durability

5/16-18 SS Cap Nut Features

• High torque capacity due to the six-sided base, allowing use with wrenches, ratchets, and socket drivers
• Closed dome end that covers and protects exposed bolt or screw threads from corrosion, damage, and contact hazards
• Corrosion and scratch resistant, durable when submerged in water or exposed to mild chemicals

Common Uses

• Marine construction, docks, and outdoor structures where fastener ends are exposed to moisture
• Coastal and waterfront applications including boardwalks, piers, and outdoor furniture
• Chemical handling environments and applications requiring a clean, polished aesthetic finish

Application

• Thread onto a compatible bolt or screw by hand until snug, then tighten with a wrench or socket sized to the hex base
• Ensure the bolt or screw does not extend beyond the interior thread depth of the cap nut
• Use with a washer when additional load distribution or surface protection is needed

Tips

• Always verify that the bolt length does not exceed the cap nut’s thread depth — an overly long fastener will bottom out before the nut is fully tightened
• Cap nuts are measured by their thread diameter and pitch, matching the bolt or screw they are paired with
• Use stainless steel washers to avoid galvanic corrosion when pairing with SS 18-8 fasteners