Value Collection 215618MSC Carriage Bolt 3/8-16 4in Grade 8

Product Description

The VALUE COLLECTION 215618MSC is a Grade 8 alloy steel carriage bolt designed for high-strength fastening applications. Sized at 3/8-16 UNC thread with a 4-inch length under head, this bolt features a square neck that locks into place upon installation to prevent rotation. The fully threaded shank runs the entire 4-inch length, providing maximum thread engagement across the full grip range. Grade 8 alloy steel construction delivers superior tensile strength compared to lower-grade fasteners, making this bolt appropriate for demanding structural and mechanical connections. The bright uncoated finish suits indoor or protected installations where surface coating is not required.

This carriage bolt is suited for structural assemblies, wood-to-metal connections, and general mechanical fastening in construction, manufacturing, and industrial maintenance environments. The 3/8-16 UNC thread is a widely used standard size found in a broad range of structural and equipment framing applications. Sold in minimum quantities of 25 per order, making it practical for job-site stocking and shop inventory. Installation is straightforward and does not require a wrench on the bolt head due to the square neck design.

Key Features

• Grade 8 alloy steel construction for high tensile strength and durability
• 3/8-16 UNC fully threaded shank for maximum thread engagement
• 4-inch length under head for deep-grip fastening applications
• Square neck prevents bolt rotation during nut tightening without a secondary tool
• Bright uncoated finish — no coating to interfere with close-tolerance assemblies
• Conforms to SAE J429 fastener standard

Compatibility

Designed as a standard SAE J429 Grade 8 carriage bolt for use in structural and mechanical assemblies requiring 3/8-16 UNC threaded fasteners with a square-neck, fully threaded configuration.

Installation Notes

Installation is performed by inserting the square neck into a matching square-hole or soft material so the neck seats and resists rotation while the nut is driven from the opposite side. Power down or de-energize any equipment before fastening in electrical or mechanical enclosures. Follow applicable structural codes and torque guidelines from engineering specifications for Grade 8 fasteners — do not substitute a lower-grade nut or washer in high-load applications. A standard open-end or socket wrench is used on the nut side only.