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 We Manufacture Locknuts  in Bulk Quantity



Locknuts, Precision
Precision locknuts are used to adjust, preload, and secure bearings, gears, and other power transmission products to shafts and spindles with a high degree of stiffness. They have machined internal threads and sturdy faces that provide strong metal-to-metal locking without distortion. Most precision locknuts are tightened with a spanner wrench. Right-handed threads are tightened with clockwise turns. Left-handed threads are tightened with counterclockwise turns. Typically, setscrews on the face or periphery of the locknut are used to lock the female threads of the locknut to the male threads of the shaft. Peripheral setscrews require radial clearance and may include shoes for locking the male and female threads in place. Clamping locknuts have separate clamping and locking sections divided by a radial groove. Locking is achieved by using screws on the outboard face. Resilient rings, another common locking method, do not use shoes or screws. Instead, they sandwich a resilient material such as nylon between the thread flanks.
 

Precision locknuts are made of stainless steel, hardened alloy steel or heat-treated alloy steel and often coated with a black oxide finish for improved corrosion-resistance. They are specified in English units such as inches (in) or metric units such as millimeters (mm) or centimeters (cm). Important dimensional specifications include major thread diameter, threads per inch (English), threads per pitch (metric), locking face diameter, overall locknut diameter, locknut width, and bearing bore size. Holes and slots are located on either the face or the periphery of the locknut. Most English threads are non-standard fractional sizes such as 1.767” and 2.360”. Many metric threads comply with shaft tolerance standards such as ISO H5. Thread standards such as Unified Coarse (UNC) and Unified Fine (UNF) are also available.

There are many types of precision locknuts. Collar locknuts are suitable for applications with large diameters, high strength, and light weight. Center locknuts can be assembled from either side and are commonly referred to as reversible, two-way, or bi-way locknuts. Jam-center locknuts offer three-point deflection with efficient locking features. Acorn-style precision locknuts include a center lock that fully engages the mating bolt before producing past the hex flats. Hexagonal products provide excellent re-usability and uniform thread deflection for high temperature and severe vibration applications. Flange-cone precision locknuts are also available.


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