Prevailing torque nut The FLANGE TRI-LOC™ locknut is suitable for a wide range of applications, including: DIN 985 - Prevailing torque type hexagon thin nuts with nonmetallic insert Current norm: DIN EN ISO 10511 Equivalent norms: ISO 10511; CSN 021492; UNI 7474; ISO 2320:2015 specifies the functional properties for prevailing torque steel nuts when tested at an ambient temperature range of +10 °C to +35 °C. 1. Prevailing torque fasteners are of two primary kinds - the deflected The prevailing torque will vary less than 75% from the value shown from the first to the fifth installation and beyond. Our products include: Hex Nuts; Flange Nuts; Lock Nut; Nylon Insert; 2 and Tension-induced nuts are held into place by increased friction from the spring of the wedging action of tightening the nut. Discover the features and benefits of Auto-Lok nuts, a type of locking nut that uses vertical deformation to generate prevailing torque. Common types include: 체결상태의 풀림 방지 기능을 강화한 제품. There are two grades of prevailing-on torque torque to rotate the nut on its mating externally threaded component with the torque measured while the nut is in motion and without clamp force 3. ), NM (#2-#12), NTM (#2-#12), and hex flange (1/4 in . Prevailing torque nuts are reusable but every use will reduce their effectiveness. Same and Next Day Delivery. Torquing these nuts over a long The prevailing-torque mechanism ensures that the nut remains securely fastened without the need for additional locking devices, making it crucial in applications where consistent clamping force is essential for safety and performance. Prevailing Torque Nuts: In order to prevent vibration loosening, a prevailing torque lock nut uses the prevailing torque concept. Unlike standard nuts that rely solely on thread friction, these fasteners maintain a consistent level of resistance to loosening through various mechanical means, ensuring a more secure fastening. Get contact details & address of companies manufacturing and supplying Torque Nuts, Torque Lock Nut across India. 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. Their superior holding ability makes them an ideal solution for securing: Road and highway signage. experience, the actual measured prevailing torque is often much higher than the minimum manufacturing specifica-tion. 85 to account for material removal for the locking mechanism. These fasteners are the optimal choice for applications that routinely sustain heavy vibration and shock, extreme temperatures, and numerous loading cycles without a moment’s rest. All of our locknuts incorporate a precision thread deflection process Prevailing Torque (PT) fasteners continue to resist loosening, even while sustaining substantial friction during assembly. Key Features and Benefits With a wealth of industry experience, Bhavya Industries proudly presents its premium range of DIN 980 V Prevailing Torque Lock Nuts. 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. Choose material: Grade 8 Steel A2 Stainless Steel. 6-2014 (Revision of ASME B18. < Back to all locknuts Guide for Prevailing-Torque Lock Nut Assembly Torques (Cad and Wax, Grade B, C, and Grade G flange nuts) lock nut standards from IFI-100 requirements Torque-Tension Requirements Imperial has made a concerted effort to provide accurate information in its catalog and on its web site, however Imperial assumes no responsibility for the accuracy of Nov 15, 2002 · Ideally, prevailing-torque nuts should be used with the minimum thread engagement necessary to develop the holding strength of the nut and the locking action. Fasteners with a prevailing torque locking feature must meet manufacturing specifications [3,4,5,6,7,8]. Critical components, critical timing. Learn about the definition, purpose, types, characteristics and testing of PT fasteners, which provide resistance to rotation and vibration loosening. +(91) 022-6659 5844 sales@jigneshsteel. Under a standard transverse vibration test, commonly called a Junker test, prevailing torque nuts tend to self-loosen initially but retain a residual amount of preload. MacLean-Fogg Component Solutions is a world leader in the manufacture of prevailing torque lock-nuts. 2. In addition to inspections common to all internally threaded fasteners (nuts), prevailing torque locknuts are inspected for prevailing torque performance. As a general guide, during initial experiments to determine the specific torque settings required to achieve ISO 10513:2012 Prevailing torque type all-metal hexagon high nuts with metric fine pitch thread - Property classes 8, 10 and 12. Patents for this type of nut began to appear in the 1860's and many of the principal types can be traced back over 100 years. com Prevailing torque lock nuts are one piece, prevailing torque hex nuts with a conical top and a flat bottom bearing surface with chamfered corners. Mechanical prevailing torque lock nuts are designed to provide stability in high-vibration assemblies and applications. f The values in this table are required to perform tests in accordance with the test conditions in the laboratory. For the toughest applications – where continuous heavy vibration, shock, extreme temperatures, and numerous loading cycles exist – you can count on Lok-Mor Prevailing-Torque locknuts. ), NU (1/4 in. Application. Screws for use with PEM prevailing torque locknuts should be Class 3A/4h fit or no smaller than Class 2A/6g. Locknuts, also known as a prevailing torque nuts, stiff nuts, or elastic stop nuts resist loosening caused by machine vibrations and torque. Manufacturer of Stainless Steel Prevailing Torque Nut in India, Buy DIN 980 Lock Nuts in various metric sizes, check Class 8/ 10 DIN 980V stover nuts Dimension and Specifications. Standard: DIN 980V ~ISO 7042 . 3) Top insert, two-piece construction nuts which derive their prevailing-torque characteristics from an insert, usually a full ring of non-metallic material, located and retained in the nut at its top surface. – 1-1/2 in. All – metal ones distort top threads, while non – metallic insert nuts use a polymer ring. Prevailing torque nuts are specialized fasteners that prevent loosening caused by vibration and dynamic forces. Many prevailing torque nuts or prevailing torque lock nuts attempt to address these high torque applications, but none perform as well as the Klincher Locknut due to its unique design. Jun 8, 2007 · Some prevailing torque fasteners are supplied with a wax or other lubricating coating - which is why the "published" torque may be lower than for a standard nut. They are primarily available in stainless steel and other finishes. Radiators and heating elements. This distortion creates a self-contained frictional interference. Specific examples of Feb 10, 2025 · Detailed Explanation of the Prevailing Torque Mechanism. Automotive assemblies. com Home > Threaded Fasteners > Nuts > All-Metal Locknuts > Prevailing Torque Prevailing Torque Metal Locknuts Prevailing Torque All Metal Locknuts are six sided internally threaded fasteners that have deformed threads that act as a locking component to keep it from loosening under normal operations. Torque for the self-locking hexagon nuts with non-metallic liner must be a maximum of 50% of the value. – 3 in. The prevailing torque-type fastener is the only fastener that retains its locking torque independent of an axial load. The locking action, created by distortion of their top threads, is said to resist loosening caused by shock, vibration and other dynamic forces. Under transverse vibration, prevailing torque type nuts are not truly ‘lock - 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. They do this by creating high friction between the nut and the bolt or screw. 5 prevailing torque all metal We offer Prevailing Torque testing on Fasteners up to sizes M20 to the following standards: – ISO 2320 Prevailing torque type steel nuts* – BS 4929-1 & 2 Steel hexagon prevailing torque type nuts* We can combine prevailing torque testing with Proof Load Testing on Nuts, Bolts, and Fasteners to provide a comprehensive overview of a sample 1) Installation torque and clamp load are calculated using the proof load for the class bolt and nut specified multiplied by 0. Full Thread - Yellow Zinc Plated shipped same day to keep your operations running smoothly. Regardless, efforts are needed to revisit and revise these specifications and to provide a clear basis for their listed locking torque values. We supply custom prevailing torque internally threaded fasteners to industry since 1925. For long threaded assemblies, tension-induced lock nuts may be more appropriate due to their free-spinning nature. Prevailing torque nuts have some portion of the nut that deforms elastically to provide a locking action. thepipingmart. 4 prevailing-off torque torque to rotate after backing off the nut until the removal of the clamp force in the following 360° rotation of the nut 3. Learn what prevailing torque is and how it affects the security and reliability of threaded fasteners. Hexagon All Metal Prevailing Torque Nut. Compare different methods of developing PT feature, such as deforming threads, adding inserts or coatings, and their advantages and limitations. Unlike prevailing torque locknuts, tension-induced nuts are perfect for long threaded assemblies. 4 days ago · Prevailing Torque Nuts. Stover nuts are wax treated to prevent galling from occurring during the installation. Let’s break this down. These include: 2-way reversible lock nuts, Flex-Type Lock Nuts, Stover Lock Nuts. It generates a resistance called prevailing torque through a unique internal mechanism. 3) Calculated using formula: Nominal diameter x Clamp Load (from note 1) x Friction factor (dimensionless value of 0. 6-2008) Prevailing Torque Locknuts (Inch Series) AN AMERICAN NATIONAL STANDARD Two Park Avenue • New York, NY • 10016 USA Prevailing torque nuts, often referred to as stiff nuts, are one of the commonest methods of providing resistance to self-loosening. As a leading manufacturer of (Prevailing Torque Nut) 980V in India, we are committed to delivering excellence. After an initial stage of self-loosening nut rotation stops leaving a residual preload in the fastener. Localized plastic deformation – Some of the starting threads need to be able to accept the mating part (bolt, say) before the prevailing torque begins. nut를 강제로 변형시키거나 보조재(nylon ring, washer등)를 삽입하여 bolt와 조립 시 틈새를 없앰으로써, 억지 끼워 맞춤 효과를 주는 방식으로 기계 및 자동차의 장시간 운전 시 발생할 수 있는 진동이나 충격에 의한 풀림 현상이 없도록 한 제품. As with any fastener, if your joint is sufficiently important that you need to maintain the preload within a known range you should test your actual application and develop a torque Apr 7, 2025 · A Stover nut is a single-piece, all-metal prevailing torque nut. They are commonly used by machinists, engineers, and mechanics, and there are two general types of locknuts: prevailing torque and surface-bearing. Prevailing torque locknuts create friction between the nut and the bolt threads. The Locknut starts freely on a bolt or stud like a common nut until the deflected thread portion is reached; then, it requires wrenching to final position anywhere on the mating part. A prevailing torque lock nut relies on the principle of prevailing torque to resist vibration loosening. e. 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. All PEM metal prevailing torque type locknuts achieve their prevailing torque by altering the shape of the nut in some way - most commonly by distorting the threads of the nut, which then grips the mating part during tightening. 3M Fastener Components: Prevailing Torque Nuts Prevailing Torque Nuts Key Details. e Torque for the first installation only all-metal self-locking hex nuts. These nuts are ideal for high-temperature or corrosive environments where nylon inserts might degrade. Apr 30, 2025 · Prevailing torque lock nuts provide immediate resistance to loosening and are ideal for short assemblies, while nylon insert lock nuts offer excellent vibration resistance but are less reusable. ), NTU (1/4 in. These are nuts that are not free running on a mating externally threaded component (i. The prevailing torque mechanism in locknuts is designed to resist loosening under dynamic conditions, such as vibration or thermal cycling. When reusing prevailing torque nuts check that the prevailing torque is still suitable for the application with a torque wrench. This method ensures a secure and maintenance-free fastening without the need for supplementary locking devices. Prevailing Torque Nut Applications. Standard Prevailing-Torque Metric Hex Nuts Size Data Table Property Classes 5, 9, and 10 ANSI/ASME B18. Here's how it works in detail: Friction-Based Locking. 65 mm. The prevailing torque in prevailing torque locknuts comes from localized plastic deformation to an interference fit with continuous sliding during assembly. Trucks, semi-trucks, and other Aug 29, 2023 · Prevailing Torque Nuts. The locking action is achieved through the distortion of the top threads. The install and removal torque values will be similar for second installation onwards. Photoelastic studies at a major US university have shown an equitable distribution of stress over the entire Klincher Locknut, versus a severe stress Since 1995, Locknut Technology has manufactured and processed high-quality, all-metal, prevailing-torque locknuts for industrial applications. ASME B18. Locking Nuts, also known as: lock nuts, prevailing torque nut, self-locking nut, stiff nut or elastic stop nut and they are almost always used in conjunction with a mating bolt to fasten components together. 3/8"-16 x 1" Grade 8 Hex Head Cap Screw, USA. Grade 10 Steel. specified in ISO 2320 “Prevailing torque type steel hexagon nuts mechanical and performance properties”. 20 for dry installation). Prevailing torque Locking Nuts can be used to help prevent some of the most common factors of loosening, such as shock and vibration. This friction is typically achieved through various mechanisms, such as thread deformation or the use of a non-metallic insert As the nut is tightened, the three deflected threads create frictional interference, producing a prevailing torque that secures the nut in place. The grip on the bolt threads gets tighter and tighter, to keep the nut from loosening. The force needed to drive a nut down a bolt or screwed rod’s threaded shaft so that it holds firmly and does not come loose is known as the prevailing torque in this context. Torque Values and Friction Coefficient - All Metal Self Locking Nuts - Where Torque tightening equipment is used, account should be taken of the additional torque required to overcome the resistance of the prevailing torque locking nut. Please As the nut is tightened, the six flex-locking elements deform elastically, creating a prevailing torque that secures the nut in place. To meet customer requirements, we offer a wide range of Prevailing Torque locknut options. The nylon insert in Nyloc® nuts only provide 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. Nov 23, 2024 · A prevailing torque lock nut is a type of nut designed to resist rotation during assembly and removal. It includes a combined test method to determine the prevailing torque properties and the torque/clamp force properties at the same time. When pre-load is lost, the prevailing torque fastener can prevent loosening of an as-sembly subjected to continued shock or vibration. Prevailing Torque Threaded fastener prevailing torque (also known as running Apr 29, 2025 · Prevailing Torque Nuts. These specifications include a range of allowable locking torque that vary with thread size and Dec 8, 2011 · 1-Prevailing Torque Type Lock Nuts: All metal prevailing torque type lock nuts achieve their prevailing torque by altering the shape of the nut in some way – most commonly by distorting the threads of the nut which then bites into the mating part when tightened. < Back to all locknuts Two most common lock nut groups: 1. ISO 10513:2012 specifies the characteristics of prevailing torque type all-metal hexagon high nuts with metric fine pitch thread with nominal thread diameters, D, from 8 mm up to and including 36 mm, in product grade A for diameter sizes up to and including 16 mm and Lock nuts (also known as prevailing torque nuts or stiff nuts) are resistant to vibration & torque. Prevailing torque is the resistance to assembling or disassembling the locknut and mating part when the assembly is not clamping (not developing tension in the mating part). The curves are for a M8 nylon insert nut being subjected to transverse vibration of amplitude +/- 0. Flexloc style and polymer insert lock nut are the main types of prevailing torque lock nuts. Grade 8 Steel. FASTENER TORQUE CHARTS GUIDE FOR PREVAILING-TORQUE LOCK NUT ASSEMBLY TORQUES (CAD AND WAX, GRADE B, C, AND GRADE G FLANGE NUTS) LOCK NUT STANDARDS FROM IFI-100 REQUIREMENTS Torque-Tension Requirements • Clamp loads for the Grade B lock nuts equal 75% of the bolt proof loads specified for SAE J-429 Grade 5, and ASTM A-449 bolts. Find here Torque Nuts, Torque Lock Nut manufacturers, suppliers & exporters in India. [ 2 ] See full list on blog. test for a prevailing torque nut is shown in Figure 2. In the special case where prevailing torque locking features are employed, the model includes an additional prevailing torque zone. threads in the nut or clamped components or nut rather than to yield of the fastener. Mar 19, 2017 · Prevailing torque nuts are a type of locknut designed to resist loosening under vibration and torque. NOTE: A more detailed discussion of the four tightening zones is presented in section 2. Their locking action is created by the distortion of their uppermost threads and should resist loosening caused by shock, vibration and other forces. Choose from our selection of prevailing torque locknuts, including nylon-insert locknuts, distorted-thread locknuts, and more. Oct 30, 2018 · Prevailing torque is introduced into nuts, bolts and inserts by altering or distorting the thread or introducing nonmetallic rings or patches. Prevailing torque lock nuts (commonly known as stover lock nuts) have a rounded top and a flat bottom. 75 for a factor of safety and multiplied by 0. Those in the know, understand that prevailing torque nuts can self-loosen, as can be seen from the results of a Junker test, but they can still be useful in many applications. It features a conical top and a flat bottom bearing surface. 5. The threads near the top are intentionally imperfect to add shock and vibration resistance. , bolt) and have a self-contained prevailing torque feature, which provides a degree of resistance to rotation This Standard covers the complete general, dimensional, mechanical, and performance requirements (proof load, prevailing torque, and torque-tension) for carbon steel, inch series nylon insert locknuts of grades N2, N5, and N8 in styles NE (1/4 in. Nut/Bolt Compatibility There are three grades of prevailing-torque type steel hex nuts designated as Grades A, B and C, respectively. Prevailing torque nuts resist loosening through internal friction features, with all-metal variants relying on deformed threads. The two main categories of prevailing torque type nuts include: all metal and nylon insert lock nuts. ), NTE (1/4 in. Stover Nuts Prevailing Torque Lock Nuts. Our specialties include production of FLEXTOP ®, high performance locknuts, automation locknuts, flange locknuts and weld nuts. 16. ikpfqtxatkspcfevdcofsacsblxplaguoylbgjxfaiktchkxajwy