Value Collection HCI20310275-100BX Hex Head Bolt 5/16-18

Product Description

The VALUE COLLECTION HCI20310275-100BX is a 5/16-18 UNC hex head bolt designed for general mechanical and structural fastening applications. This bolt measures 2-3/4 inches in length under the head and features partial threading along the shank. Manufactured from Grade 2 steel with a bright, uncoated finish, it meets ASTM A307 fastener standards. Partial threading leaves a smooth shank section near the head, which helps resist shear forces in bolted joints. This bolt is sized for standard inch-based tooling and is sold in a box of 100 pieces, making it well suited for contractors, maintenance technicians, and tradespeople who need reliable bulk fastener stock on the job.

This hex head bolt is used across a wide range of trade and light structural applications including HVAC equipment mounting, plumbing bracket assembly, electrical panel support structures, and general mechanical connections. The 5/16-18 UNC thread pattern is one of the most common coarse-thread sizes in inch-based fastener systems, compatible with standard 5/16-18 nuts and tapped holes. The ASTM A307 designation makes it appropriate for general-purpose bolted connections where high-strength fasteners are not required. Sold in increments of 100 pieces per box to support production and field service use.

Key Features

• 5/16-18 UNC coarse thread pattern for broad compatibility with standard inch-based hardware
• 2-3/4 inches length under head for moderate-depth fastening applications
• Partial threading leaves a smooth shank section to help carry shear loads in bolted joints
• Grade 2 steel construction meets ASTM A307 requirements for general-purpose fastening
• Bright, uncoated finish for use in dry or protected environments
• Sold in a box of 100 pieces for bulk field and shop inventory

Compatibility

Designed for use with standard 5/16-18 UNC nuts, washers, and tapped holes in inch-based fastening applications. Suitable for general-purpose structural and mechanical connections meeting ASTM A307 requirements.

Installation Notes

Installation is performed with a standard 1/2-inch hex wrench or socket driver sized for a 5/16-18 bolt head. Always use a flat washer and appropriate nut torqued to the joint design specification. Do not use these Grade 2 fasteners in high-strength structural applications that require SAE Grade 5, Grade 8, or ASTM A325 hardware. Verify thread engagement depth meets a minimum of one bolt diameter per applicable mechanical codes before finalizing the connection.