Value Collection ST5/16-18X3 Hex Bolt 5/16-18 Unc 3in Ss

Product Description

The VALUE COLLECTION ST5/16-18X3 is a self sealing hex bolt designed for fastening applications that require a secure, leak-resistant connection. Constructed from 18-8 stainless steel and passivated for enhanced corrosion resistance, this bolt features a silicone O-ring under the head that compresses during installation to form a seal against moisture and fluid ingress. The 5/16-18 UNC thread pattern and 3-inch length under head make it suitable for moderate-depth through-fastening in metal, plastic, or composite assemblies. Each package contains 5 bolts. Typically installed by mechanical contractors, maintenance technicians, or plumbers working on fluid-handling enclosures, equipment housings, and panel covers.

This bolt is well suited for use in residential and light commercial applications where standard hex bolts would allow moisture infiltration at the fastener point. Common install scenarios include pump housings, HVAC equipment panels, outdoor enclosures, and any assembly exposed to water, condensate, or wash-down conditions. The silicone O-ring seals the fastener penetration without the need for additional thread sealant or gasket material at the bolt location. Sold in a pack of 5, making it practical for small repairs or low-volume service work requiring only a few fasteners.

Key Features

• 18-8 stainless steel construction with passivated finish for corrosion resistance in wet or outdoor environments
• Integrated silicone O-ring under the head provides a self sealing barrier against moisture and fluid ingress
• 5/16-18 UNC thread standard for broad compatibility with inch-series tapped holes and standard hardware
• 3-inch length under head accommodates moderate material stack-ups
• Hex drive head accepts standard hex wrenches and sockets
• Pack of 5 bolts per package, with a minimum order quantity of 1 package

Compatibility

Designed as an OEM-style replacement or service fastener for any application requiring a 5/16-18 UNC self sealing hex bolt with a 3-inch length under head in 18-8 stainless steel.

Installation Notes

Installation requires a standard hex wrench or socket sized for the bolt head. Power down or depressurize any system before removing or replacing fasteners on equipment panels or fluid-handling assemblies. Do not overtighten, as excessive torque can deform or extrude the silicone O-ring and compromise the seal. Ensure the mating surface is clean and flat so the O-ring seats evenly on installation.