Gibraltar 42207G Heavy Hex Jam Nut 3/4-10 Unc Alloy Steel

Product Description

The GIBRALTAR 42207G is a heavy hex jam nut threaded to 3/4-10 UNC specifications and manufactured from alloy steel with a black oxide finish. Jam nuts are low-profile fasteners used to lock a standard nut in position or serve as a standalone fastener where reduced height is required. This nut measures 1-1/4 inches across flats and 27/64 inches in height, following heavy hex dimensional standards. The right-hand thread direction conforms to standard installation practice. Alloy steel construction provides higher tensile strength than plain carbon steel, making this nut suitable for high-load mechanical assemblies. The black oxide finish offers mild corrosion resistance and reduced light reflection.

This jam nut is used in general industrial, structural, and mechanical applications where a 3/4-10 UNC threaded connection is specified. Typical installations include machinery frames, anchor bolt assemblies, threaded rod connections, and equipment mounting applications. It is appropriate for both light commercial and heavy industrial environments. Trades that commonly install this fastener include millwrights, pipefitters, ironworkers, and maintenance mechanics working on bolted structural or mechanical assemblies.

Key Features

• 3/4-10 UNC thread form for compatibility with standard unified coarse thread fasteners
• Heavy hex profile at 1-1/4 inches across flats provides greater wrench-bearing surface than standard hex
• Low-profile jam nut height of 27/64 inches for locking applications with limited axial clearance
• Alloy steel construction for elevated tensile and shear strength
• Black oxide finish for mild corrosion resistance and surface uniformity
• Right-hand thread direction for standard torque-on installation

Compatibility

Designed for use with 3/4-10 UNC threaded fasteners, rods, and bolts in heavy hex configurations. Suitable for general mechanical and structural assemblies requiring a low-profile locking nut in alloy steel.

Installation Notes

Install using a heavy hex wrench or socket sized for 1-1/4 inches across flats. Jam nuts are typically run down against a primary nut and tightened against it to prevent loosening — torque the primary nut first, then snug the jam nut against it. Degrease mating threads before installation if lubricants are not part of the specified assembly procedure. Always follow applicable mechanical and structural codes for the assembly in which this fastener is used.