Value Collection MP39305 Hex Head Cap Screw 1/4-28 Grade 8

Product Description

The VALUE COLLECTION MP39305 is a 1/4-28 UNF partially threaded hex head cap screw manufactured from Grade 8 steel with a zinc yellow dichromate finish. Grade 8 fasteners carry a higher tensile and proof load rating than Grade 5 hardware, making them suitable for high-stress mechanical assemblies. The zinc yellow dichromate coating provides a base level of corrosion resistance. This screw measures 1-1/4 inches under the head and conforms to ASME B18.2.1 dimensional standards. Licensed tradespeople and maintenance technicians install these in structural, mechanical, and equipment-mounting applications where a reliable, standardized fastener is required.

This hex head cap screw is used across a wide range of trade and industrial applications including HVAC equipment mounting, electrical enclosure assembly, plumbing equipment brackets, and general mechanical fastening where a fine-thread 1/4-28 UNF fastener is specified. Partial threading allows for a stronger grip in thicker material joints. The ASME B18.2.1 compliance ensures dimensional interchangeability with other conforming hardware. Sold in a package quantity of 50 units, making it practical for service vans and shop stock.

Key Features

• Grade 8 steel construction for high tensile strength in demanding mechanical assemblies
• 1/4-28 UNF fine-thread pattern provides increased thread engagement and resistance to loosening under vibration
• Partially threaded shank suits applications requiring a bearing shoulder in thicker joined materials
• Zinc yellow dichromate finish offers baseline corrosion resistance for indoor and sheltered outdoor use
• Conforms to ASME B18.2.1 for dimensional consistency and interchangeability
• Packaged in quantities of 50 for efficient shop and field restocking

Compatibility

Designed as a standard 1/4-28 UNF Grade 8 hex head cap screw per ASME B18.2.1, suitable for use wherever that thread size and grade are specified in mechanical, HVAC, electrical, or plumbing equipment assemblies.

Installation Notes

Installation is performed with a standard hex wrench or socket sized for a 1/4-inch hex head cap screw. Always de-energize equipment and relieve any system pressure before replacing fasteners on live assemblies. Verify thread engagement depth and do not substitute a lower-grade fastener in applications that specify Grade 8. Follow applicable equipment manufacturer torque specifications and relevant codes such as NEC or IFGC where fastener grades are referenced in equipment mounting requirements.