Value Collection 821088MSC Flange Bolt 5/8-18 Unf 2in Grade 8

Product Description

The VALUE COLLECTION 821088MSC is a partially threaded smooth flange bolt engineered for high-load fastening applications where a built-in bearing surface is required. It carries a 5/8-18 UNF thread, a 2-inch length under head, and a 1-1/2-inch thread length, leaving a smooth shank section between the flange and the threads. The integral flange — 1-21/64 inches (1.3281 inches) in diameter — distributes clamping load across a wider surface area without a separate washer. Manufactured from Grade 8 alloy steel with a phosphate and oil finish, this bolt delivers high tensile strength and moderate corrosion resistance. It is installed with a standard hex drive and meets IFI 111 and SAE J429 fastener standards.

This bolt is suited for heavy-duty mechanical and structural assemblies where a flanged bearing surface eliminates the need for a flat washer and maintains consistent clamp load. Typical applications include automotive drivetrain components, agricultural equipment frames, industrial machinery, and fabricated steel structures. The partially threaded shank provides a grip area that resists shear loads at the joint interface, making it a preferred choice where alignment and shear strength matter alongside tensile clamping force.

Key Features

• 5/8-18 UNF thread for fine-pitch engagement and precise clamp-load control
• Grade 8 alloy steel construction for high tensile and proof-load capacity
• Smooth integral flange at 1-21/64 inches diameter distributes load without a separate washer
• Partial threading with 1-1/2-inch thread length leaves a full-shank grip zone for shear resistance
• Phosphate and oil finish provides moderate corrosion and galling resistance
• Meets IFI 111 and SAE J429 fastener standards for dimensional and mechanical compliance

Compatibility

Designed as an OEM-style replacement or service fastener for assemblies requiring a 5/8-18 UNF partially threaded smooth flange bolt with a 2-inch length under head and Grade 8 alloy steel construction.

Installation Notes

Installation is performed by a mechanic, millwright, or qualified tradesperson using a standard hex wrench or socket. Verify mating thread condition and clean threads before assembly. Apply torque per the applicable Grade 8 fastener torque specification for the joint design — do not substitute a lower-grade fastener in a Grade 8-rated joint. Follow applicable machinery safety lockout and tagout procedures before servicing any assembly that includes this fastener.