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A locknut, also known as a lock nut, locking nut, self-locking nut, prevailing torque nut, stiff nut or elastic stop nut, is a nut that resists loosening under vibrations and torque. Prevailing torque nuts have some portion of the nut that deforms elastically to provide a locking action. Free-spinning locknuts exist which carry the advantage of not requiring extra torque until seated.
Types
There are various kinds of specialised lock nuts, including:
Prevailing torque values
Prevailing torque differentiates a locknut from a free spinning nut based on a value of how much torque is required during installation before clamp loading. For example, on a nylon-insert nut, it is the torque needed to overcome the resistance of the nylon dragging across the mating thread. This torque value is usually not very high relative to final installation torque. Tolerance ranges for torque are specified in some standards such as (ISO, DIN, IFI, ASME, SAE, AN-, MS-, NAS- NASM-).
Prevention of loosening
Locknuts are one way to prevent vibration from loosening a bolted joint. Other methods include safety wire, lock washers, and thread-locking fluid.
See also
Mechanical joint
References
= Notes
== Bibliography
=Smith, Carroll (1990), Carroll Smith's Nuts, Bolts, Fasteners, and Plumbing Handbook, MotorBooks/MBI Publishing Company, ISBN 0-87938-406-9.
External links
"Hold Everything", February 1946, Popular Science page on lock nuts and washer technology developed during World War Two
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Locknut - Wikipedia
A locknut, also known as a lock nut, locking nut, self-locking nut, prevailing torque nut, [1] stiff nut [1] or elastic stop nut, [2] is a nut that resists loosening under vibrations and torque. Prevailing …
What Is Locknut?- Definition, Types & How it works
What is Locknut? Locknuts are internally threaded fastener that possesses locking capabilities either by themselves or in concert with another component. By design, lock nuts are …
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Lock nuts, also known as locking nuts or self-locking nuts, are a special type of mechanical fasteners designed to resist vibrations, shocks, and other forces that can cause traditional nuts …
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The locknut is also known as a self-locking nut which prevents the loosening action of the nut under high torque and vibration. During the process, some portion of the lock nuts get …
Locknuts | McMaster-Carr
Choose from our selection of locknuts, including over 7,300 products in a wide range of styles and sizes. In stock and ready to ship.
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A lock nut, also referred to as locknut, locking nut, and self-locking nut, is a kind of fastener that used to secure bolted joints and resist loosening under vibration and torque.
Comprehensive Guide to Lock Nuts - MFG Shop
16 Jan 2025 · A lock nut, also known as a locknut or self-locking nut, is a specialized fastener designed to resist loosening under vibration and torque. Unlike standard nuts, lock nuts …
What is a lock nut? How does it work? | Essentra Components US
24 Okt 2023 · There are essentially two lock-nut types: Lock nuts which use friction are designed with pitted or flanged grooves and need greater torque to tighten and loosen. They don’t spin …
Lock Nut Types: Nylon Insert Lock Nuts, Jam Nuts, and Bearing …
03 Jun 2021 · What is a Locknut? Lock nuts are an internally threaded fastener that either lock by themselves or in concert with another component. Lock nuts are engineered to resist …
A Basic Guide to Lock Nut - Runsom Precision
A lock nut, also known as locknut, locking nut, and self-locking nut, is a type of nut that is used to secure a bolt or other fastener in place. It works by compressing the components it is securing …