Value Collection 581400PR Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 581400PR is a hex socket cap screw designed for applications requiring a secure, high-strength fastener in tight or recessed spaces. Threaded to the 1/4-28 UNF specification, this screw features a 3/16-inch hex drive and measures 1-3/8 inches in length under the head. It is partially threaded, making it well-suited for clamping and load-bearing joints where thread engagement is concentrated at the mating end. Constructed from alloy steel with a black oxide finish, the 581400PR meets ASME/ANSI B18.3 and ASTM A574 standards. Machinists, millwrights, and mechanical contractors install this fastener across industrial assemblies, machine frames, and equipment maintenance applications.

This screw is used in precision mechanical assemblies, maintenance and repair operations, and OEM manufacturing where fine-thread engagement and controlled clamping force are required. The 1/4-28 UNF thread pitch is common in applications that demand greater thread strength and resistance to vibration loosening compared to coarse-thread equivalents. The black oxide coating provides mild corrosion resistance and reduces light reflection, making it suitable for both exposed and enclosed assemblies in commercial and industrial environments.

Key Features

• 1/4-28 UNF fine thread for high-strength, vibration-resistant fastening
• 1-3/8 inch length under head with partial threading for reliable clamping joints
• 3/16-inch hex socket drive for use with standard Allen keys and hex drivers
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides mild corrosion resistance and low-glare appearance
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as an OEM-style and MRO replacement hex socket cap screw for industrial machinery, mechanical assemblies, and equipment requiring 1/4-28 UNF fine-thread fasteners with a 3/16-inch hex drive.

Installation Notes

Installation is performed by machinists, millwrights, or mechanical technicians using a 3/16-inch hex key or socket driver. Ensure mating threaded holes are clean and properly tapped to 1/4-28 UNF before installation. De-energize and lock out equipment per applicable OSHA lockout/tagout procedures before replacing or installing fasteners in live machinery. Do not substitute a coarse-thread screw in a fine-thread application, as cross-threading will damage the mating component.