Jam Nut - Imperial

Industrial & Cable Group stocks a comprehensive range of imperial hex jam nuts in UNF (Unified National Fine) thread sizes, suitable for a wide variety of industrial, marine, and motion control applications. With 13 products across multiple sizes and thread directions, this range is one of our most complete fastener offerings.

Imperial jam nuts — sometimes called half nuts or lock nuts — are thin-profile nuts used to lock a standard nut or threaded component in position, preventing loosening caused by vibration or rotational forces. Their low-profile design makes them ideal where space is limited, and their fine thread pitch provides precise adjustment and a secure lock.

Our imperial jam nut range includes both right-hand (RH) and left-hand (LH) hex configurations across sizes including 1/4-28, 5/16-24, 3/8-24, 1/2-20, 11/16-16, and 3/4-16. Left-hand thread variants are particularly suited to linkages and assemblies where counter-rotation would cause a right-hand nut to back off over time — a common requirement in control cable systems, rod ends, and clevises.

Whether you're specifying fasteners for a new build or sourcing replacements for existing machinery, our imperial jam nuts deliver the reliability and thread precision your application requires.

Browse the full range below or contact our team for help selecting the right size and thread direction.