Value Collection 47161 Smooth Flange Bolt 5/8-18 Unf Grade 8

Product Description

The VALUE COLLECTION 47161 is a smooth flange bolt designed for high-strength fastening applications requiring a load-distributing flange head. The bolt features a 5/8-18 UNF thread with a 2-1/2 inch length under head and is partially threaded, leaving a shank section to resist shear loads. The integrated smooth flange, measuring 1-21/64 inches in diameter, spreads clamping force across the mating surface without the need for a separate washer. Manufactured from Grade 8 alloy steel, this bolt meets the elevated tensile and proof load requirements called out in IFI 111 and SAE J429. A zinc yellow dichromate finish provides corrosion resistance in moderate service environments. Installers in mechanical, HVAC, and general industrial assembly rely on this bolt where joint integrity under vibration is critical.

This smooth flange bolt is suited for structural and mechanical assembly in residential and light commercial applications. Typical use cases include equipment mounting, bracket fastening, and any bolted joint where a captive washer-style head reduces part count and simplifies assembly. The hex drive allows installation with standard 15/16 inch hex sockets or wrenches. It is commonly used by HVAC technicians, plumbers, and industrial maintenance trades when securing equipment frames, pipe supports, and mechanical enclosures requiring a Grade 8 fastener.

Key Features

• 5/8-18 UNF thread form for fine-pitch clamping control in high-load joints
• Partially threaded shank resists shear forces along the bolt body
• Smooth integral flange at 1-21/64 inches diameter distributes bearing load without a separate washer
• Grade 8 alloy steel construction meets IFI 111 and SAE J429 strength standards
• Zinc yellow dichromate finish provides moderate corrosion protection
• Hex drive head works with standard socket and open-end wrenches

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for bolted assemblies specifying a 5/8-18 UNF smooth flange bolt with a 2-1/2 inch length under head and Grade 8 alloy steel construction per IFI 111 and SAE J429.

Installation Notes

Installation should be performed by a qualified technician familiar with torque specifications for Grade 8 fasteners in the application at hand. Always de-energize and lock out equipment before servicing bolted mechanical assemblies. Use a calibrated torque wrench and follow the equipment manufacturer's torque specifications; do not estimate final torque by feel. Inspect mating threads for damage or contamination before installation to avoid galling the alloy steel threads.