Value Collection 581418PR Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 581418PR is a hex socket cap screw designed for applications requiring a precise, high-strength threaded fastener. This screw features a 1/4-28 UNF thread form, a 6-inch length under the head, and a 3/16-inch hex drive socket. It is partially threaded, which provides a smooth shank section for shear-loading applications and controlled clamping. Constructed from alloy steel with a black oxide coating, it offers solid tensile strength and moderate corrosion resistance suitable for industrial and mechanical assembly environments. Machinists, millwrights, maintenance technicians, and mechanical contractors are the primary installers of this fastener type.

This socket cap screw is suited for use in tight clearance areas where a standard hex head cannot be driven. The recessed hex drive allows flush or near-flush installation in counterbored holes. Typical applications include machine frames, fixtures, jigs, tooling plates, and equipment housings in light industrial and manufacturing settings. The partially threaded shank makes it appropriate where bolt stretch and shear resistance matter more than full thread engagement across the entire length.

Key Features

• 1/4-28 UNF thread for fine-pitch engagement and precise torque control
• 6-inch length under head provides reach for deep counterbore or stacked material applications
• 3/16-inch hex socket drive for use with standard hex keys and Allen wrenches
• Partially threaded shank improves shear load resistance and alignment
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards
• Black oxide finish provides mild corrosion resistance and reduces light reflection

Compatibility

Designed as an OEM-style replacement or direct-use fastener for mechanical assemblies requiring a 1/4-28 UNF partially threaded hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574.

Installation Notes

Installation is performed with a 3/16-inch hex key or Allen driver; use a torque wrench when specified torque values are required by the assembly drawing or engineering specification. Ensure the mating tapped hole thread form matches the 1/4-28 UNF standard before installation to prevent thread galling or cross-threading. Black oxide coatings offer only minimal corrosion protection — apply thread lubricant or sealant if the installation environment involves moisture or chemical exposure. Do not mix thread standards or use an imperial fastener in a metric-threaded bore.