Prevailing torque nuts e Torque for the first installation only all-metal self-locking hex nuts. Torque for the self-locking hexagon nuts with non-metallic liner must be a maximum of 50% of the value. Prevailing Torque Threaded fastener prevailing torque (also known as running Mar 13, 2025 · The prevailing torque lock nut has prevailing torque features to de-shape elastically and avoid free spinning as the standard nut does. They do this by creating high friction between the nut and the bolt or screw. The locking action, created by distortion of their top threads, is said to resist loosening caused by shock, vibration and other dynamic forces. Captive Fastener offers a full catalog of fastening solutions, and we are ready to help you navigate our inventory to find the right component for your job. Ease of installation: Can be installed with standard tools. This mechanism involves creating resistance to rotation through an interference fit between the nut and the mating part, such as a bolt. Flexloc style and polymer insert lock nut are the main types of prevailing torque lock nuts. Locking nuts often incorporate features such as nylon inserts or deformed threads to increase friction, making them highly resistant to loosening under vibrations or external Nov 23, 2024 · Prevailing torque lock nuts utilize a specialized mechanism to maintain a secure fit even under conditions that typically cause loosening, such as vibration and dynamic forces. Our products include: Hex Nuts; Flange Nuts; Lock Nut; Nylon Insert; 2 and Feb 10, 2025 · Detailed Explanation of the Prevailing Torque Mechanism. Prevailing torque nuts have some portion of the nut that deforms elastically to provide a locking action. Prevailing Torque Aug 29, 2023 · Prevailing Torque Nuts. 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. [2] Free-spinning locknuts exist which carry - ISO 2320 applies to prevailing torque all metal type nuts (lock nut with metal insert) and prevailing torque non-metallic insert (lock nut with nylon insert) type nuts - ISO 2320 applies to lock nuts with metal inserts within the temperature range of −50 °C to +150 °C. Under transverse vibration, prevailing torque type nuts are not truly ‘lock Locknuts, also known as a prevailing torque nuts, stiff nuts, or elastic stop nuts resist loosening caused by machine vibrations and torque. Apr 29, 2025 · Prevailing Torque Nuts. Two most common lock nut groups: 1. Break-loose Torque: is the torque applied in a removal Prevailing Torque in Locking Nuts For nuts, particularly locking nuts, prevailing torque refers to the force required to securely tighten the nut onto a threaded fastener. This friction is typically achieved through various mechanisms, such as thread deformation or the use of a non-metallic insert experience, the actual measured prevailing torque is often much higher than the minimum manufacturing specifica-tion. The curves are for a M8 nylon insert nut being subjected to transverse vibration of amplitude +/- 0. Prevailing torque nuts are specialized fasteners that prevent loosening caused by vibration and dynamic forces. test for a prevailing torque nut is shown in Figure 2. During the first time dis-assembly of matting threads it is called as 1st OFF torque, during second time dis-assembly it is called as 2nd OFF torque and so on. Specific examples of Fastener Components: Prevailing Torque Nuts Prevailing Torque Nuts Key Details. f The values in this table are required to perform tests in accordance with the test conditions in the laboratory. A prevailing torque lock nut relies on the principle of prevailing torque to resist vibration loosening. . This type of nut is designed to resist loosening, even when exposed to repetitive impacts or vibrations. This is the performance standard for prevailing torque nuts and covers upper and lower bound values for the prevailing torque. The prevailing torque mechanism in locknuts is designed to resist loosening under dynamic conditions, such as vibration or thermal cycling. Prevailing torque locknuts create friction between the nut and the bolt threads. The two main categories of prevailing torque type nuts include: all metal and nylon insert lock nuts. Prevailing OFF torque: is the torque measured (maxi-mum value) when the fastener is being removed away from its seating position. 65 mm. This standard specifies that the prevailing torque for nylon insert type nuts, the maximum prevailing torques for first assembly shall be 50% of the values specified for the all-metal nut. Same and Next Day Delivery. PREVAILING TORQUE – a design feature of the lock nut produces friction between threads of mated components thereby increasing the force needed to tighten as well as loosen the nut. Resistance to loosening: Reliable against vibration-induced loosening. Regardless, efforts are needed to revisit and revise these specifications and to provide a clear basis for their listed locking torque values. Choose from our selection of prevailing torque locknuts, including nylon-insert locknuts, distorted-thread locknuts, and more. MacLean-Fogg Component Solutions is a world leader in the manufacture of prevailing torque lock-nuts. Here's how it works in detail: Friction-Based Locking. Apr 30, 2025 · Prevailing torque lock nuts are widely used in industries such as automotive, aerospace, construction, and manufacturing due to their exceptional vibration resistance and secure fastening capabilities. Prevailing torque lock nuts are one piece, prevailing torque hex nuts with a conical top and a flat bottom bearing surface with chamfered corners. After an initial stage of self-loosening nut rotation stops leaving a residual preload in the fastener. They are commonly used by machinists, engineers, and mechanics, and there are two general types of locknuts: prevailing torque and surface-bearing. If you are unsure if mechanical prevailing torque lock nuts are suitable for your application, call 201-337-6800 to discuss your options. We supply custom prevailing torque internally threaded fasteners to industry since 1925. Jan 18, 2023 · Prevailing torque lock nuts are fasteners that use a locking mechanism to prevent the nut from loosening due to vibration or other forces. In this context, prevailing torque is the amount of force required to run the nut down the threaded shaft of a bolt or screwed rod, such that the nut grips tightly and does not back off easily. 2. qzz qgjuh uchm vlupl swas jctrxm caeh niesck gvzcjin hwrsa

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