Holo-krome 86176 Hex Socket Cap Screw 4-40 Unc Alloy Steel

Product Description

The HOLO-KROME 86176 is a hex socket cap screw designed for precision fastening in mechanical assemblies, tooling fixtures, and close-tolerance applications. This screw features a 4-40 UNC thread, a 1-inch length under head, and a 3/32-inch hex drive. It is partially threaded and manufactured from alloy steel with a black oxide coating that provides moderate corrosion resistance and reduces light reflection. Licensed machinists, millwrights, and mechanical assemblers typically specify this fastener where a low-profile, high-strength cap screw is required. It conforms to ASME B18.3 and ASTM A574 standards, confirming tensile strength and dimensional compliance for critical fastener applications.

This fastener is suited for light-duty machine components, instrument enclosures, electrical panel assemblies, and jig-and-fixture work where a small-diameter socket head cap screw is required. The 4-40 UNC thread is a common size in precision equipment, control panel hardware, and electronic chassis assemblies. The black oxide finish makes it a practical choice in low-moisture indoor environments. Sold individually with a minimum order quantity of 100 pieces per order.

Key Features

• 4-40 UNC thread size for precision small-diameter fastening applications
• 1-inch length under head with partial threading for controlled engagement depth
• 3/32-inch hex drive for use with standard Allen keys or hex bit drivers
• Alloy steel construction meets ASTM A574 tensile strength requirements
• Black oxide coating reduces surface reflectivity and provides light corrosion resistance
• Conforms to ASME B18.3 dimensional standard for socket head cap screws

Compatibility

Designed as an OEM-style replacement or stock fastener for assemblies requiring a 4-40 UNC hex socket cap screw with a 1-inch length under head and a 3/32-inch drive, conforming to ASME B18.3 and ASTM A574.

Installation Notes

Install using a calibrated 3/32-inch hex key or socket bit driver. Ensure mating threaded holes are clean and free of debris before installation. Do not exceed the torque rating appropriate for a 4-40 alloy steel fastener as defined by the applicable fastener standard or assembly specification. A minimum order quantity of 100 pieces applies to this SKU.