Value Collection 217198MSC Carriage Bolt 5/8-11 3-1/2 in Grade 8

Product Description

The VALUE COLLECTION 217198MSC is a Grade 8 alloy steel carriage bolt with a 5/8-11 UNC thread and a 3-1/2 inch length under head. The square neck below the dome head locks into a mating hole to prevent rotation during installation without requiring a secondary wrench on the bolt head. Fully threaded along the entire shank, this fastener is suited for high-strength bolted connections where alloy steel and Grade 8 mechanical properties are specified. The bright uncoated finish indicates no added corrosion protection, making it appropriate for dry or controlled-environment applications. Installers and fabricators working to SAE J429 standards will recognize this bolt as a standard-catalog replacement or primary fastener for structural assemblies.

This carriage bolt is used in structural steel fabrication, wood-to-steel connections, equipment mounting, and general industrial assembly where a Grade 8 fastener is required by spec. The 5/8-11 UNC thread is a common heavy-fastener size found in agricultural equipment, heavy machinery, and construction framing hardware. Because the bolt is fully threaded, it provides engagement across the full shank length, which is useful when stack thickness varies or when a nut must be positioned anywhere along the bolt body.

Key Features

• Grade 8 alloy steel construction meets SAE J429 mechanical property requirements for high-strength fastener applications
• 5/8-11 UNC thread — a standard coarse-thread pitch for heavy-duty bolted joints
• Fully threaded shank provides flexibility in nut placement along the full 3-1/2 inch length
• Square neck below the dome head resists rotation during tightening without requiring a tool on the bolt head
• Bright uncoated finish — no plating or coating to affect dimensional tolerances or conductivity
• Conforms to SAE J429 fastener standard

Compatibility

Designed as a standard 5/8-11 UNC Grade 8 carriage bolt for use with any matching 5/8-11 hex nut and appropriately sized mating hole in wood, steel, or composite substrates where SAE J429 Grade 8 fasteners are specified.

Installation Notes

Insert the bolt through a pre-drilled hole sized to pull the square neck flush and prevent rotation before applying the nut. Torque to the value specified by the joint designer or applicable structural code for Grade 8 fasteners of this diameter — do not substitute a generic torque value. Use proper PPE and ensure mating surfaces are clean and free of burrs before assembly. Because this bolt is uncoated, apply appropriate corrosion protection measures if the installation environment requires it.