Value Collection ST5/16-18X2-1/2 Hex Bolt 5/16-18 Ss

Product Description

The VALUE COLLECTION ST5/16-18X2-1/2 is a self sealing hex bolt designed for fastening applications that require a positive seal against fluid or gas intrusion at the bolt head. Constructed from 18-8 stainless steel and passivated to maximize corrosion resistance, this bolt features a silicone O-ring under the head that compresses on installation to create a watertight seal. The 5/16-18 UNC thread runs the full shank at 2.5 inches of length under head. Plumbers, HVAC technicians, and maintenance mechanics install these where conventional hex bolts would allow moisture or media to wick past the fastener head.

This bolt is suited for use in light commercial and residential mechanical assemblies, including equipment enclosures, fluid system panels, and outdoor or wet-environment structural connections. The 18-8 stainless steel grade provides good resistance to mild acids, fresh water, and atmospheric corrosion. Sold in a pack of 5, making it practical for small repairs or single-point replacements without overstocking. The UNC thread form is compatible with standard inch-series tapped holes and nuts.

Key Features

• Silicone O-ring under head creates a seal against fluid and moisture intrusion at the fastener point
• 18-8 stainless steel construction with passivation treatment for enhanced corrosion resistance
• 5/16-18 UNC thread standard for compatibility with common inch-series hardware
• 2.5 inches length under head accommodates standard panel and flange thicknesses
• Pack of 5 units per order — convenient for service calls and small-volume jobs

Compatibility

Designed as a direct-fit self sealing hex bolt for applications requiring 5/16-18 UNC inch-series fasteners with an integrated head seal, typical in HVAC equipment panels, plumbing access covers, and general mechanical assemblies exposed to moisture.

Installation Notes

Installation requires a standard hex wrench or socket set sized for the bolt head. Shut off and depressurize any fluid or pneumatic system before replacing fasteners on pressurized enclosures or manifolds. Do not overtighten — the silicone O-ring seals under moderate, even torque; excessive force can distort or displace the O-ring and compromise the seal. Follow applicable mechanical codes and equipment manufacturer torque guidelines for the assembly being serviced.