Gibraltar MAS-0105 Acme Hex Jam Nut 1-1/2-5 Right Hand

Product Description

The GIBRALTAR MAS-0105 is a 1-1/2-5 Acme thread hex jam nut designed for right-hand threaded rod and lead screw assemblies. Manufactured from steel with a black oxide finish, this jam nut provides corrosion resistance and a low-profile locking solution for linear motion and power transmission applications. At 0.5 inches high and 2.25 inches across the flats, it meets a 2G class of fit — a standard Acme thread tolerance class suited for general-purpose power transmission where controlled clearance is acceptable. Millwrights, maintenance mechanics, and machine builders use this nut to lock and position components on Acme threaded rod without adding significant axial stack height.

This nut is used in industrial and mechanical applications where Acme threaded rod or lead screws are employed, such as linear actuators, jack screws, vises, and feed mechanisms. The right-hand thread direction is standard for most Acme rod assemblies. The 2G thread fit class is compatible with 2G-class Acme threaded rod, making this a direct drop-in for maintenance, repair, and original equipment applications. It is sold individually and is appropriate for both light fabrication and OEM replacement scenarios.

Key Features

• 1-1/2-5 Acme right-hand thread for standard power transmission rod assemblies
• 2G class of fit provides controlled clearance suitable for general-purpose use
• Black oxide finish adds surface corrosion resistance
• Low-profile hex jam nut at 0.5 inches high minimizes axial stack height
• 2.25 inches across flats for standard wrench engagement
• Steel construction for strength in mechanical and industrial service

Compatibility

Designed for use with 1-1/2-5 Acme right-hand threaded rod and lead screws with a 2G thread fit class.

Installation Notes

Installation is typically performed by millwrights or maintenance mechanics using an appropriately sized open-end or box wrench. Ensure the mating threaded rod is a right-hand 1-1/2-5 Acme thread with a compatible 2G fit class before installation. De-energize or lock out any machinery before servicing components on live equipment. A second nut or jam-nut procedure should be used to achieve the desired lock without over-stressing the thread engagement.