Value Collection D39013 Hex Head Cap Screw 1/4-20 X 3.5 in Grade 8

Product Description

The VALUE COLLECTION D39013 is a 1/4-20 hex head cap screw manufactured from Grade 8 steel with a zinc yellow dichromate finish. Measuring 3.5 inches under the head, this fastener features partial threading along its shank and conforms to ASME B18.2.1 dimensional standards. Grade 8 steel provides high tensile strength suited to demanding mechanical and structural assemblies. The zinc yellow dichromate coating offers corrosion resistance in moderate-exposure environments. This screw is driven with a standard hex wrench or socket and is sized to the Unified National Coarse thread standard at 1/4-20. It is a reliable choice for trade and industrial assembly work requiring a high-strength inch-series fastener.

This cap screw is used across a wide range of trade and light industrial applications including HVAC equipment mounting, electrical enclosure assembly, plumbing fixture brackets, and general mechanical assemblies. Partial threading allows the unthreaded shank to act as a shoulder or grip length, which is useful when clamping two or more components together without thread engagement through the full joint stack. Suitable for use in residential and commercial service environments where a high-strength 1/4-20 fastener is required.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• Zinc yellow dichromate finish provides corrosion resistance
• Partially threaded shank per ASME B18.2.1 standard
• 1/4-20 UNC thread form for broad hardware compatibility
• 3.5-inch length under head accommodates deeper joint stacks
• Hex head drive accepts standard sockets and wrenches

Compatibility

Designed as a standard inch-series hex head cap screw compatible with any 1/4-20 UNC tapped hole or nut in assemblies requiring Grade 8 strength and ASME B18.2.1 compliance.

Installation Notes

Installation is performed with a standard hex socket or open-end wrench sized for a 1/4-inch hex head cap screw. Ensure the mating tapped hole or nut is clean and free of debris before threading to avoid galling. Do not over-torque; refer to published Grade 8 torque tables for the applicable joint material and lubrication condition. Fastener replacement in equipment assemblies should follow the equipment manufacturer service documentation.