Value Collection C89470 1/4-28 X 3-1/2 in Grade 8 Cap Screw 50pk

Product Description

The Value Collection C89470 is a Grade 8 steel hex head cap screw in a 1/4-28 UNF thread configuration with a 3-1/2 inch length under head. It features a zinc yellow dichromate finish that provides corrosion resistance in demanding service environments. The screw is partially threaded and conforms to ASME B18.2.1 dimensional standards. This fastener is used across mechanical, HVAC, plumbing, and electrical trade applications wherever a high-strength, fine-thread hex cap screw is required. Each package contains 50 pieces, making it suitable for service trucks, shop stock, or job-site replenishment.

The C89470 is well-suited for residential and light commercial mechanical installations where a fine-thread fastener is preferred for its superior clamp load and vibration resistance compared to coarse-thread alternatives. Typical applications include equipment mounting, structural bracketing, and assembly work in HVAC units, electrical enclosures, and plumbing support structures. The Grade 8 rating means this fastener handles higher tensile loads than standard Grade 5 hardware, making it appropriate for high-stress mechanical connections.

Key Features

• Grade 8 steel construction for high tensile strength and load-bearing capacity
• 1/4-28 UNF fine thread for improved clamp load and vibration resistance
• Zinc yellow dichromate finish for corrosion protection in service environments
• Partially threaded shank per ASME B18.2.1 dimensional standard
• 3-1/2 inch length under head suits deep-reach or stacked-material applications
• 50-piece package quantity supports bench stock and field replenishment

Compatibility

Designed as a standard 1/4-28 UNF hex head cap screw per ASME B18.2.1, compatible with any application specifying a Grade 8 partially threaded fastener in that thread size and length.

Installation Notes

Installation is performed with a standard hex wrench or socket set sized for a 1/4-28 fastener. Ensure mating threads are clean and free of debris before driving. Do not overtighten in tapped aluminum or softer substrates, as Grade 8 hardware can strip softer mating materials. Follow applicable mechanical codes and equipment manufacturer torque specifications for the joint being assembled.