ASME B18.16.6 Prevailing Torque Hex Nuts | All Metal Lock Nuts | GFM-WCR System

ASME B18.16.6 Prevailing Torque Hex Nuts | All Metal Lock Nuts | GFM-WCR System


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ASME B18.16.6 Prevailing Torque Lock Nut | Nylon Insert | Inch Series | American Standard | LONGZE


ASME B18.16.6 is the governing American national standard for prevailing torque type steel hex nuts with a non-metallic (typically nylon) insert. This standard defines the dimensional and performance requirements for lock nuts designed to resist loosening under extreme vibration and dynamic loading in inch-series assemblies.

The nylon insert creates a frictional interference fit with the mating bolt threads, providing a constant "prevailing torque" that maintains joint integrity even if the initial axial tension is partially lost. It is a cornerstone of North American automotive and industrial safety fastening.

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Engineering Principle


The ASME B18.16.6 lock nut utilizes a captured polymer ring within a recessed cavity at the top of the nut. As the bolt enters the nylon insert, the polymer deforms elastically over the bolt threads, creating a high-friction radial compressive force. This design allows for multiple reuses (within limits) and provides a non-marring locking action that does not damage the mating bolt's thread coating.

Engineering Note: ASME B18.16.6 specifies the "Prevailing Torque" values that must be achieved during both the first and fifth installation/removal cycles to ensure locking reliability.
Engineering Selection Guidance: Standard nylon inserts are rated for temperatures up to 250°F (121°C). For higher temperature environments, all-metal prevailing torque nuts (ASME B18.16.6 Grade C/G) are recommended.
Standards System Integration


Standard Definition:
  • ASME B18.16.6 = Prevailing Torque Lock Nuts (Nylon Insert - Inch Series)
  • ANSI/ASME B18.16.6 = American National Standard for Industrial Locking Systems
Cross Standard Equivalents


Recommended Fastening System


Systematic Integration: ASME B18.16.6 lock nuts are the critical locking companion for ASME B18.2.1 hex bolts and cap screws. For reinforced safety in North American heavy machinery, use with ASME B18.22.1 hardened washers.
Technical Specifications


ParameterValue
معیاریASME B18.16.6
Locking TypeNylon Insert (Prevailing Torque)
Common GradesGrade 2, 5, 8 / Grade N, NE, NM
موادCarbon Steel / Stainless Steel (304/316)
Size Range#4 (0.112") to 1-1/2" Nominal
Application Fields


  • Automotive suspension and engine vibration management
  • North American heavy trucking and trailer assemblies
  • Agricultural equipment and harsh-environment machinery
  • Renewable energy (Wind turbine nacelle assembly)
Engineering Value


Ensures a secure, reusable, and cost-effective vibration-proof connection that meets the rigorous torque and mechanical performance requirements of the American engineering industry.
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Free Sample Program (ASME Locking Series)
  • ✔ High-Torque Grade 8 hardened lock nuts in stock
  • ✔ Stainless Steel (304/316) nylon insert series available
  • ✔ Finishes: Clear/Yellow Zinc, Cadmium, Black Oxide
  • ✔ Custom nylon insert colors available for batch identification
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