Gibraltar Z9488SET Spherical Washer Assembly 1-1/2 in

Product Description

The GIBRALTAR Z9488SET is a spherical washer assembly designed for use with 1-1/2 inch bolts. It consists of a matched male and female washer pair that allows angular misalignment between a bolt and its mating surface, distributing clamp load evenly across uneven or non-perpendicular joint faces. The assembly is manufactured from 12L14 grade case hardened steel with a black oxide finish that provides moderate corrosion resistance and reduces galling during installation. At 0.85 pounds, the set is suited for heavy structural fastening applications where standard flat washers cannot compensate for surface irregularities.

This spherical washer assembly is used in structural steel connections, industrial machinery mounts, conveyor frames, and general heavy-duty mechanical assemblies where bolt axes may not be perfectly perpendicular to the bearing surface. It is installed by millwrights, ironworkers, industrial maintenance mechanics, and experienced tradespeople working on fabricated steel structures or equipment bases. The black oxide finish and case hardened construction make it appropriate for indoor and sheltered outdoor environments where moderate surface protection is acceptable.

Key Features

• Matched male and female spherical washer pair for angular load distribution on misaligned bolt joints
• 12L14 grade case hardened steel construction for high surface hardness and wear resistance
• Black oxide finish for moderate corrosion resistance and reduced galling
• Female inside diameter of 1-5/8 inches and outside diameter of 2-7/8 inches
• Male inside diameter of 1-9/16 inches and outside diameter of 2-7/8 inches
• 3 inch radius spherical surface with 1/2 inch thickness for consistent angular compensation

Compatibility

Designed for use with 1-1/2 inch diameter bolts in structural and industrial fastening applications where spherical load compensation is required.

Installation Notes

Installation is typically performed by qualified millwrights or ironworkers following applicable structural connection specifications. The male washer seats against the bolt head or nut face and the female washer seats against the structural surface, with the spherical faces mated together to allow angular adjustment before final torque is applied. Always de-energize and lock out any mechanical or electrical systems associated with the structure being fastened before beginning work. Consult applicable structural codes and the equipment manufacturer specifications for proper bolt torque values, as none are specified for this assembly.