Value Collection ST3/8-16X3/4 Self Sealing Hex Bolt

Product Description

The VALUE COLLECTION ST3/8-16X3/4 is a self sealing hex bolt designed for applications where a leak-proof fastened joint is required. The bolt features a 3/8-16 UNC thread and a 3/4-inch length under the head. It is manufactured from 18-8 stainless steel and passivated to maximize corrosion resistance. A captive silicone O-ring beneath the head compresses against the mating surface when torqued, creating a reliable fluid or gas seal without a separate gasket. This fastener is appropriate for plumbing, HVAC, and mechanical assemblies where moisture exposure or sealing integrity is a service concern.

This hex bolt is suited for residential and commercial installations where standard fasteners would allow fluid ingress or leakage at the bolt head. Common applications include mounting flanges, access panels, enclosures, and fluid system components that require both structural fastening and a head-level seal. The passivated 18-8 stainless steel construction makes it a reliable choice in wet, corrosive, or outdoor environments. Sold in a package quantity of 5.

Key Features

• Captive silicone O-ring provides an integral head seal, eliminating the need for a separate gasket
• 18-8 stainless steel construction with passivation finish for corrosion resistance
• 3/8-16 UNC thread for compatibility with standard inch-series tapped holes and nuts
• 3/4-inch length under head suits shallow to medium engagement applications
• Hex drive accepts standard hex wrenches and sockets for straightforward installation
• Sold in packs of 5 with a minimum order quantity of 1 pack

Compatibility

Designed as a direct-fit self sealing fastener for any application requiring a 3/8-16 UNC threaded bolt with a head-level O-ring seal, including flanged joints, enclosures, and fluid system mounting points in HVAC, plumbing, and general mechanical assemblies.

Installation Notes

Installation is performed by a licensed plumber, HVAC technician, or qualified mechanical tradesperson depending on the system. Shut off and depressurize any fluid or gas system before removing or installing sealing fasteners. Ensure the mating surface is clean and flat so the silicone O-ring seats evenly and compresses uniformly. Do not overtighten, as excessive torque can deform the O-ring and compromise the seal.