Value Collection R63640121 Carriage Bolt 5/16-18 1-1/2 in

Product Description

The VALUE COLLECTION R63640121 is a 5/16-18 carriage bolt designed for general fastening applications requiring a clean, flush-bearing surface and resistance to corrosion. Constructed from Grade 18-8 stainless steel with an uncoated finish, this bolt delivers solid corrosion resistance in wet, outdoor, or chemically exposed environments. The square neck beneath the domed head locks into wood or composite materials to prevent rotation during nut tightening. Length under head measures 1-1/2 inches on a Unified National Coarse thread form. Plumbers, electricians, HVAC technicians, and pool service professionals commonly reach for 18-8 stainless hardware when working near moisture or pool chemicals.

This carriage bolt is suited for light structural and equipment-mounting tasks in residential and light commercial settings. Typical applications include attaching equipment mounting brackets, securing junction boxes to framing, fastening pool equipment supports, and general assembly work where a tamper-resistant, rotation-resistant fastener head is needed. The UNC 5/16-18 thread pitch is one of the most common in the trade, making mating hardware easy to source. Minimum order quantity is 5 pieces.

Key Features

• Grade 18-8 stainless steel construction resists rust and corrosion in wet and outdoor environments
• Square neck prevents bolt rotation when driving the nut, no wrench needed on the head
• Uncoated finish — no galvanic coating concerns when pairing with stainless nuts and washers
• 5/16-18 UNC thread pitch accepts widely available standard hex nuts and wing nuts
• 1-1/2 inch length under head suits typical bracket and light framing fastening tasks
• Domed head profile provides a smooth, low-profile finished appearance on exposed surfaces

Compatibility

Designed as a standard UNC 5/16-18 carriage bolt compatible with any 5/16-18 threaded hex nut, flange nut, or wing nut meeting Unified National Coarse standards.

Installation Notes

Installation requires drilling a clean through-hole sized to the bolt shank diameter so the square neck seats properly and prevents spinning. Drive the nut from the opposite side using a standard wrench or socket; no tool contact is needed at the bolt head. When installing in pool or marine environments, use matching Grade 18-8 or 316 stainless nuts and washers to avoid dissimilar-metal corrosion. Follow applicable mechanical and structural codes for fastener torque and spacing requirements.