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ISO Small Wrench & Special Small Wrench
All-Metal Conical Lock Nut – Class 10 Steel Zinc Plated
Small wrench all-metal lock nuts are metric prevailing torque hex nuts designed to resist loosening caused by vibration and repeated movement. These nuts feature a conical shape with a controlled elliptical deformation that creates interference with the mating bolt or screw threads.
As the nut is tightened, the deformed portion produces friction against the bolt threads, increasing resistance to rotation and helping maintain a secure assembly.
This product range includes both ISO 7042 standardized conical lock nuts and special/OEM small-wrench versions that are not covered by the ISO standard. The ISO 7042 versions follow specified dimensional requirements, while the non-standardized versions use smaller wrench sizes than standard metric hex nuts to accommodate applications where space around the fastener is limited. They are also known as all-metal lock nuts, prevailing torque nuts, distorted thread nuts, conical lock nuts, Stover nuts, and small wrench lock nuts.
What is the difference between ISO 7042 and Small Wrench OEM Lock Nuts?
ISO 7042 conical lock nuts are manufactured to an international dimensional standard and are available with defined metric thread and wrench dimensions. For example, ISO 7042 specifies a 16 mm wrench size for M10 x 1.5 and an 18 mm wrench size for M12 x 1.75.
Small wrench versions are special or OEM-style lock nuts rather than ISO 7042 standardized dimensions. They retain the same general all-metal conical prevailing torque design but use a smaller wrench size to provide additional clearance around the fastener. These non-standardized small-wrench nuts are particularly useful where standard ISO or DIN wrench dimensions would interfere with surrounding components.
What material is a Class 10 Steel ISO / Small Wrench Lock Nut made from?
These small wrench conical lock nuts are manufactured from Class 10 steel with a zinc plated finish, providing a high-strength fastening solution suitable for demanding mechanical applications. Class 10 steel nuts are commonly paired with Class 10.9 metric bolts and screws for high-strength assemblies.
The zinc plated finish provides corrosion resistance while maintaining the mechanical properties of the high-strength steel. These nuts are intended for general industrial, automotive, machinery, and OEM applications where both high strength and prevailing torque performance are required.
Why choose a Small Wrench All-Metal Conical Lock Nut?
Small wrench all-metal lock nuts provide reliable prevailing torque without the use of a nylon insert, making them suitable for applications where a compact, heat-resistant, or rugged locking solution is preferred. The conical deformation creates thread friction that helps prevent the nut from backing off under vibration and repeated movement.
The small-wrench versions provide an additional advantage where installation clearance is limited. Their reduced wrench size allows tools to access the nut in tighter spaces and can help reduce the required clearance around adjacent components. Because these are all-metal lock nuts, they can also be advantageous in applications where elevated temperatures make nylon-insert lock nuts less suitable.
Where are Small Wrench All-Metal Conical Lock Nuts commonly used?
Class 10 zinc plated small wrench conical lock nuts are commonly used in automotive assemblies, motorcycles, agricultural equipment, construction machinery, industrial machinery, robotics, automation equipment, conveyors, hydraulic and pneumatic equipment, electrical equipment, manufacturing machinery, and OEM assemblies.
The OEM small-wrench versions are particularly useful in compact mechanical assemblies where clearance around the nut is restricted, including automotive chassis components, engine compartments, brackets, equipment frames, machine assemblies, and other applications originally designed around a specialized small wrench dimension.
