Value Collection 821266MSC Smooth Flange Bolt 5/8-11 Unc

Product Description

The VALUE COLLECTION 821266MSC is a smooth flange bolt designed for high-strength fastening applications in mechanical, structural, and industrial assembly work. It features a 5/8-11 UNC thread with a 3-3/4 inch length under head and partial threading of 1-1/2 inches. Constructed from Grade 8 alloy steel with a phosphate and oil finish, this bolt delivers high tensile strength and corrosion resistance suitable for demanding service environments. The integrated smooth flange distributes clamping load evenly, eliminating the need for a separate washer. Maintenance technicians, millwrights, and field service professionals working with heavy equipment and structural connections are the typical installers.

This bolt is suited for use in heavy-duty mechanical assemblies, equipment frames, structural brackets, and industrial machinery where a Grade 8 alloy steel fastener with a flanged head is specified. The smooth flange face provides a clean bearing surface against the mating material without serrations, making it appropriate for assemblies where the flange must not mar or lock into the substrate. It meets IFI 111 and SAE J429 standards, confirming dimensional and mechanical compliance for inch-series fastener specifications.

Key Features

• 5/8-11 UNC thread form — standard inch-series coarse thread for broad tool and nut compatibility
• Grade 8 alloy steel construction — high proof load and tensile strength for demanding structural applications
• Partially threaded shank — 1-1/2 inch thread length with an unthreaded grip zone for shear-load applications
• Smooth flange face — 1-21/64 inch (1.3281 inches) flange diameter provides load distribution without serration marks
• Phosphate and oil finish — enhances corrosion resistance and lubricity during installation
• Meets IFI 111 and SAE J429 standards — confirmed dimensional and mechanical compliance

Compatibility

Designed for use with 5/8-11 UNC hex nuts and compatible flange hardware in inch-series fastener assemblies meeting IFI 111 and SAE J429 specifications.

Installation Notes

Installation is performed by mechanics, millwrights, or field technicians using standard hex drive tooling sized for 5/8 inch fasteners. Follow torque specifications listed in the applicable equipment service manual or engineering drawings for Grade 8 hardware — do not estimate torque without a reference value. Ensure mating threads are clean and free of debris before installation. Always use a calibrated torque wrench when final tightening Grade 8 fasteners in structural or load-bearing connections.