ASME B18.16.6 Prevailing Torque Hex Nuts | All Metal Lock Nuts | GFM-WCR System
eric@lzfasteners.com
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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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.
- ASME B18.16.6 = Prevailing Torque Lock Nuts (Nylon Insert - Inch Series)
- ANSI/ASME B18.16.6 = American National Standard for Industrial Locking Systems
| Parameter | Value |
|---|---|
| معیاری | ASME B18.16.6 |
| Locking Type | Nylon Insert (Prevailing Torque) |
| Common Grades | Grade 2, 5, 8 / Grade N, NE, NM |
| مواد | Carbon Steel / Stainless Steel (304/316) |
| Size Range | #4 (0.112") to 1-1/2" Nominal |
- 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)
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- ✔ 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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