Holo-krome 780110088 Hex Socket Cap Screw 4-40 Unc

Product Description

The HOLO-KROME 780110088 is a hex socket cap screw designed for precision fastening in applications where a low-profile, high-strength threaded connection is required. It carries a 4-40 UNC thread size and a 7/8-inch length under the head, with fully threaded engagement along the entire shank. The drive is a 3/32-inch internal hex socket, requiring an Allen-type key or hex bit driver for installation. Manufactured from 18-8 stainless steel with a bright, uncoated finish, this fastener resists corrosion in moist or chemically active environments. Machinists, mechanical assemblers, and field technicians working on light-duty precision equipment commonly specify this fastener.

This screw is suited for light mechanical assemblies, instrument enclosures, electrical panels, HVAC control components, and similar applications where a fine-thread, small-diameter fastener is needed. The 4-40 UNC thread is a standard fine-pitch inch series used widely in electronics, instrumentation, and compact mechanical hardware. Its fully threaded shank maximizes thread engagement even in shallow tapped holes, making it appropriate for thin material applications common in control boards, brackets, and enclosure panels.

Key Features

• 4-40 UNC thread size with fully threaded shank for maximum engagement in thin stock
• 7/8-inch length under head accommodates standard panel and bracket stackups
• 3/32-inch hex socket drive for precise torque application with minimal cam-out
• 18-8 stainless steel construction provides corrosion resistance without surface coating
• Bright, uncoated finish meets ASME B18.3 and ASTM F837 fastener standards
• UNSPSC Code 31161501 for procurement system classification

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application specifying a 4-40 UNC fully threaded socket head cap screw in 18-8 stainless steel.

Installation Notes

Installation requires a 3/32-inch hex key or hex bit driver; using an undersized or worn key risks rounding the socket drive. Ensure the mating tapped hole is clean and correctly sized for 4-40 UNC thread before fastening. In corrosive or dissimilar-metal environments, verify galvanic compatibility with the base material. Power down or de-energize any assembly before accessing fastened electrical enclosures or control components.