Holo-krome 78108 Hex Socket Cap Screw 3/8-16 Unc Ss

Product Description

The HOLO-KROME 78108 is a hex socket cap screw designed for precision fastening applications where high corrosion resistance and reliable clamping force are required. Sized at 3/8-16 UNC with a 2.5-inch length under head, this screw is partially threaded, allowing shank engagement for shear-load applications. The 5/16-inch hex drive socket accepts standard hex keys and T-handle drivers. Manufactured from 18-8 stainless steel with a bright, uncoated finish, it meets ASME B18.3 and ASTM F837 standards. Machinists, maintenance technicians, and mechanical contractors install this fastener in assemblies requiring stainless-grade corrosion resistance.

The 78108 is suited for industrial, commercial, and trade applications where a standard UNC thread pattern is specified. Partial threading makes it appropriate for through-bolting and applications requiring a smooth shank in the grip area. Common install environments include HVAC equipment frames, pump housings, structural brackets, and general mechanical assemblies. The 3/8-16 UNC thread form is widely used across North American equipment platforms, making this screw a common replacement and maintenance item for service technicians across multiple trades.

Key Features

• 3/8-16 UNC thread size — standard coarse-thread form for broad compatibility
• 2.5-inch length under head with partial threading for shank-bearing applications
• 18-8 stainless steel construction for corrosion resistance in wet or harsh environments
• Bright, uncoated finish — no plating to chip, flake, or affect thread tolerance
• 5/16-inch hex socket drive accepts standard hex keys and driver bits
• Meets ASME B18.3 and ASTM F837 fastener standards

Compatibility

Designed as an OEM-style replacement or maintenance fastener for equipment and assemblies specifying a 3/8-16 UNC hex socket cap screw with a 2.5-inch length under head in stainless steel.

Installation Notes

Installation should be performed by a qualified technician using a calibrated hex key or socket driver sized to 5/16 inches. De-energize and lock out any equipment before servicing fastened assemblies. Apply thread lubricant or anti-seize compound only if specified by the equipment manufacturer, as over-lubrication can affect torque-tension relationships on stainless fasteners. Stainless steel fasteners are susceptible to galling during installation — use slow, steady torque application and avoid power tools at full speed.