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Lock nuts (prevailing torque nuts) are engineered to resist loosening under vibration and dynamic loading through an integrated locking feature. Unlike standard nuts that rely solely on friction between threads, lock nuts incorporate a nylon insert, an ovalized thread profile, or a metal locking collar that creates sustained prevailing torque throughout the nut's thread engagement. This design maintains clamping force even when the nut is not fully torqued against the joint surface.
Zhejiang Chance & Union supplies lock nuts in both nylon insert (type N) and all-metal (type M) configurations, in carbon steel, alloy steel, and stainless steel. Available in metric and inch sizes, with finishes including zinc plating, hot-dip galvanizing, and plain. Each batch undergoes torque testing and dimensional verification to ensure consistent prevailing torque values and reliable locking performance.
Locking Mechanisms
- Nylon Insert: Non-marring, reusable, temperature stable
- All-Metal Oval: High temperature, high strength
- All-Metal Top Lock: Deflected threads at top
- All-Metal Side Lock: Pinch-style locking
- Custom Configurations: Special locking profiles
Product Specifications
| Parameter | Range / Options |
| Diameter range | M3 – M48 · 1/4″ – 2″ |
| Thread class | 6H (metric) · 2B (UNC) · rolled threads |
| Locking types | Nylon insert · all-metal oval · top lock · side lock |
| Property classes | 8 · 10 · 12 · stainless A2/A4 |
| Materials | Carbon steel · alloy steel · stainless 304/316 |
| Finish options | Zinc plated · HDG · plain · phosphate |
Production Capacity
30k
m² Facility
80+
Cold Headers
800t
Monthly Output
2k
Tons Stock
B2B Procurement Advantages
Supply Chain Reliability
- Permanent stock of 5,000+ specifications across all locking types
- Storage capacity exceeding 2,000 tons ensures continuous availability
- 24-hour order processing with 3-day shipping for standard items
- Custom order lead time: 7–25 days, supporting production planning
- 80+ cold heading units provide production flexibility and redundancy
Quality Assurance
- ISO 9001 and IATF 16949 certified quality systems
- 100% optical sorting for dimensional accuracy
- Prevailing torque testing per IFI 100/107 and DIN EN ISO 2320
- Full traceability with material test reports and heat numbers
- Ex-factory pass rate: 99.9%
Engineering & Custom Support
With nearly 20 years of industry experience, our R&D team has developed over 1,000 custom fastener solutions for clients across 25 countries. We invest 5% of annual revenue into R&D, focusing on:
- Locking performance optimization: Prevailing torque value calibration for specific application requirements, including temperature and vibration profiles
- Custom thread profiles: Special locking geometries for non-standard mating threads and reduced installation torque variation
- Material selection: Guidance on carbon steel, alloy steel, or stainless steel based on strength, temperature, and corrosion requirements
- Prototyping: Rapid sample production for torque testing and assembly validation before volume production
Application Scenarios
- Automotive: Engine mounts, suspension components, drivetrain assemblies, and chassis fastening
- Heavy machinery: Excavator linkages, mining equipment, and conveyor systems
- Aerospace: Structural fastening where vibration resistance is critical
- Industrial equipment: Pump and compressor mounting, gearbox assemblies, and motor bases
- Renewable energy: Wind turbine bolting, solar tracker mechanisms, and hydroelectric equipment
Selection Guide for Procurement
When sourcing lock nuts for production, consider these factors that impact joint integrity and total cost:
- Locking type: Nylon insert for non-marring and reusable applications up to 120°C; all-metal oval for high-temperature (up to 400°C) and high-strength applications; top lock and side lock for specific installation constraints.
- Prevailing torque value: Different locking mechanisms provide different torque ranges; select based on required retention force and installation torque capacity.
- Reusability: Nylon insert nuts typically maintain locking performance through 5–15 reuse cycles; all-metal nuts may have limited reusability depending on design.
- Material and coating: Zinc-plated carbon steel for cost-effective indoor applications; hot-dip galvanized for outdoor exposure; stainless steel for corrosion resistance and hygienic environments.
- Thread fit: Class 6H/2B for standard clearance; tighter fits available for applications requiring reduced play.
Frequently Asked Questions
What is the difference between nylon insert and all-metal lock nuts?
Nylon insert lock nuts feature a non-metallic ring that deforms to create prevailing torque, providing consistent locking without damaging mating threads. They are reusable and suitable for temperatures up to 120°C. All-metal lock nuts achieve locking through ovalized threads or deflected tops, offering higher temperature resistance (up to 400°C) and greater strength but may have limited reusability.
How do you measure and ensure prevailing torque consistency?
We perform prevailing torque testing per IFI 100/107 and DIN EN ISO 2320 standards. Each batch is tested on calibrated torque equipment to measure both first and fifth installation torque values. Our optical sorting system also checks for proper nylon insert placement and all-metal ovalization profile.
What materials and finishes are available?
We supply lock nuts in carbon steel (property classes 8, 10, 12), alloy steel, and stainless steel (304, 316). Finishes include zinc plating, hot-dip galvanizing, phosphate coating, and plain. Selection depends on strength, temperature, and environmental requirements.
What is your typical lead time for lock nuts?
Standard sizes in stock can ship within 3 days. For custom dimensions, materials, or locking types, lead time is typically 7 to 25 days depending on order quantity and specification complexity. We support both small-batch prototyping and large-volume production orders.
Can you produce lock nuts to non-standard specifications?
Yes. Our R&D team has developed over 1,000 custom fastener solutions. We can accommodate non-standard thread sizes, locking profiles, special materials, and custom coating requirements. We provide engineering consultation to optimize lock nut design for your specific application requirements.
