Gibraltar 40859G Unequal Double Threaded Stud 5/8-11 8 in

Product Description

The GIBRALTAR 40859G is an unequal double threaded stud with a 5/8-11 thread size and an overall length of 8 inches. It features two thread lengths on a single shank: a long thread measuring 2.5 inches and a short thread measuring 0.88 inches (7/8 inch). Manufactured from Grade 5 carbon steel with a black oxide finish, this stud is built for strength and corrosion resistance in demanding fastening applications. The Class 50 thread fit provides controlled tolerances suited to structural and mechanical assembly work. Licensed tradespeople and maintenance professionals install this type of hardware in equipment mounting, flange connections, and structural assembly scenarios.

This stud is suited for commercial and industrial applications where a through-bolt or fixed anchor point is required on both ends of the fastener. The unequal thread length design allows one end to be threaded into a tapped hole or component while the longer end accepts a nut and washer assembly for external clamping. Typical install scenarios include machinery mounting, heavy equipment frames, and structural steel connections where a standard bolt cannot pass through.

Key Features

• Unequal thread design: 2.5-inch long thread and 0.88-inch short thread on a single 8-inch shank
• 5/8-11 UNC thread size for compatibility with standard 5/8-inch hardware
• Grade 5 carbon steel construction for high tensile strength
• Black oxide finish for mild corrosion resistance and reduced light reflection
• Class 50 thread fit for controlled tolerance and reliable engagement
• No flat ground on shank, preserving full shank diameter for load distribution

Compatibility

Designed as a standard replacement or new-installation fastener for applications using 5/8-11 UNC threaded connections in carbon steel stud configurations.

Installation Notes

Installation of double threaded studs is typically performed by millwrights, maintenance mechanics, or licensed tradespeople using appropriate stud driver sockets or double-nut installation methods. Always confirm the tapped hole depth and thread engagement length before driving the short-thread end. Ensure mating components are de-energized or depressurized before service. Apply thread lubricant or anti-seize compound as required by the application to prevent galling on steel-to-steel contact.