Value Collection D39113 Hex Head Cap Screw 1/2-13 X 3-1/4 in Grade 8

Product Description

The VALUE COLLECTION D39113 is a partially threaded hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 1/2-13 UNC thread size and a length under head of 3-1/4 inches. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers superior tensile strength and corrosion resistance compared to lower-grade alternatives. The partial threading allows for a smooth shank section, which is useful in applications requiring shear resistance or precise bolt alignment. It conforms to ASME B18.2.1 standards, making it suitable for work where dimensional compliance is required.

This cap screw is used in heavy-duty mechanical assemblies, equipment mounting, structural steel connections, and machine fabrication. Grade 8 fasteners are a common specification in automotive, agricultural equipment, and industrial machinery applications where high clamping force and fatigue resistance are required. The zinc yellow dichromate finish provides a level of corrosion protection appropriate for general indoor or semi-exposed environments. Licensed mechanics, millwrights, and maintenance professionals regularly specify Grade 8 hardware for critical joint assemblies.

Key Features

• 1/2-13 UNC thread for broad compatibility with standard inch-pattern nuts and tapped holes
• 3-1/4 inches length under head with partial threading for shear-resistant installations
• Grade 8 steel construction for high tensile and proof load strength
• Zinc yellow dichromate finish for corrosion resistance in general service environments
• Meets ASME B18.2.1 dimensional standards for consistent fitment

Compatibility

Designed for use with standard 1/2-13 UNC inch-series nuts, washers, and tapped components in accordance with ASME B18.2.1 dimensional specifications.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson familiar with proper fastener torque procedures for Grade 8 hardware. Always confirm hole diameter and thread engagement depth before installation. Use appropriate hand tools or impact equipment rated for 1/2-inch fasteners. Follow applicable equipment manufacturer torque specifications and relevant standards such as ASME or AISC where joint loading is a design factor.