Holo-krome 86150 Hex Socket Cap Screw 4-40 Unc Alloy Steel

Product Description

The HOLO-KROME 86150 is a hex socket cap screw designed for precision fastening in mechanical assemblies, tooling fixtures, and equipment fabrication. It features a 4-40 UNC thread and a 3/16-inch length under the head, with full threading along the shank. The drive is a 3/32-inch internal hex socket, driven with a standard hex key or Allen driver. Constructed from alloy steel with a black oxide finish, this screw delivers solid tensile strength and moderate corrosion resistance in controlled environments. Mechanical contractors, machinists, and equipment technicians are the primary installers.

This screw is suited for light-duty precision applications where space is limited and a low-profile fastener is required. Common installation scenarios include small mechanical assemblies, instrument panels, electrical enclosure hardware, and HVAC component mounting where fine-thread fasteners are specified. The 4-40 UNC thread is a standard fine-pitch size used widely across industrial and commercial equipment. Minimum order quantity is 100 pieces per order.

Key Features

• 4-40 UNC thread for precision fitment in standard fine-thread tapped holes
• 3/16-inch length under head for low-profile, space-constrained installations
• Fully threaded shank provides maximum thread engagement across the entire fastener length
• 3/32-inch hex socket drive compatible with standard hex keys and Allen drivers
• Alloy steel construction meets ASME B18.3 and ASTM A574 fastener standards
• Black oxide coating provides a non-reflective finish and mild corrosion resistance

Compatibility

Designed as a standard-geometry replacement or specification fastener for any application requiring a 4-40 UNC hex socket cap screw with a 3/16-inch length under head, conforming to ASME B18.3 and ASTM A574.

Installation Notes

Installation is performed by machinists, mechanical technicians, or qualified tradespeople using a 3/32-inch hex key or ball-end Allen driver. Ensure the receiving tapped hole is clean and free of debris before driving the fastener. Do not overtighten in thin-walled or soft-material tapped holes, as the fine 4-40 thread is susceptible to stripping. Follow applicable equipment manufacturer torque guidelines for this thread size when specified.