PREVAILING TORQUE NUT

Prevailing Torque Lock Nuts for Vibration-Resistant Fastening Applications

Engineered fastening for vibration-prone and dynamic assemblies

Nufast supplies a broad range of prevailing torque nuts, designed to maintain secure fastening under vibratory load, thermal cycling, and repeated motion. These self-locking nuts are widely used across sectors such as agricultural machinery, automotive assemblies, and general industrial production.

Prevailing torque nuts function by introducing controlled interference at the thread interface, which resists loosening during service. Available in both all-metal and nylon-insert configurations, they provide a reusable, mechanical locking solution without the need for additional components such as washers or adhesives.

Product Scope and Specifications

• Thread Sizes: M3 – M39 (nylon-insert variants up to M48)
• Materials: Carbon Steel, Stainless Steel
• Property Classes: 4, 6, 8, 10, 12.9
• Surface Finishes (stocked or available to order):
  • Plain
  • Black oxidated
  • Zinc plated (clear/yellow)
  • Chrome plated
  • Hot Dip Galvanised (HDG)
  • Nickel plated, anodised, passivated, electro-painted, polished

Manufactured to Recognised Standards

Our prevailing torque nuts are manufactured in accordance with a wide range of internationally recognised specifications, supporting consistent performance and interoperability in global applications:

DIN Standards:

DIN 980V, DIN 982, DIN 985, DIN 6924, DIN 6925, DIN 6926, DIN 6927

ISO Standards:

ISO 7040, ISO 7042, ISO 7043, ISO 7044, ISO 10511

These cover both all-metal and nylon-insert variants, encompassing common hex lock nut designs with different locking geometries and applications.

Locking Mechanism Options

All-Metal Prevailing Torque Nuts

These feature deformed or engineered thread sections that create mechanical interference with the mating fastener. Suitable for high-temperature and demanding mechanical environments.

Nylon Insert Lock Nuts

A resilient nylon ring is embedded within the nut, providing controlled thread engagement and resistance to loosening through elastic deformation and surface contact.

Availability, Logistics & Support

• Extensive stock holding in key sizes and finishes
• Same-day dispatch for stocked items
• Competitive pricing with volume availability
• Worldwide shipping and export logistics
• UK-based customer service and technical support

Nufast also supports volume call-off agreements, just-in-time delivery, and long-term scheduling to meet production demands efficiently.

Custom Manufactured Fastener Solutions

In addition to standard products, Nufast specialises in custom-manufactured components, including all-metal and weld nuts built to your technical requirements. We can support:

• Non-standard thread forms
• Custom geometries and projection features
• Specific coatings, finishes, and corrosion treatments
• Batch traceability, quality certification, and inspection documentation

Our in-house team works closely with customers from concept through to supply, offering full flexibility across prototype, low-volume, and high-volume production runs.

For detailed technical support, availability enquiries, or custom product discussions, please contact Nufast’s technical team. Or please enter your details into the fields below and we will respond to your enquiry shortly.