ISO 7040 Prevailing Torque Hexagon Nut Manufacturer | Nylon Insert Lock Nut | Standard Height Style 1 | GFM-WCR System
lisa@lzfasteners.com
ISO 7040 Prevailing Torque Hexagon Nut Manufacturer | Nylon Insert Lock Nut
LONGZE high-performance ISO 7040 Prevailing Torque Hexagon Nuts are precision-engineered for industrial vibration resistance, featuring a non-metallic (nylon) insert for superior locking capability. As a core element of the LONGZE GFM-WCR System, these Style 1 standard height lock nuts provide reliable prevailing torque performance in dynamic load environments. Our manufacturing process ensures strict adherence to dimensional tolerances and mechanical properties, supporting critical machinery, structural, and automotive assemblies.
Optimal factory-direct assembly for metric high-vibration environments:
- 🔹 Primary Bolt: ASME B18.2.1 | DIN 931 / 933 | ISO 4014 / 4017
- 🔹 Standard Washer: ASME B18.22.1 | DIN 125 | ISO 7089
- 🔹 Hardened Structural Washer: ASTM F436 | DIN 6916 | ISO 7416
- 🔹 Spring Lock Washer: ASME B18.21.1 | DIN 127 | ISO 10673 (Ref)
LONGZE GLOBAL FASTENERS STANDARDS SYSTEM
Engineering Standard Mapping Layer (ISO ➔ DIN ➔ ASME)
LONGZE Technical Specification & Performance Lab
1. Technical HUB
| Range | M3 to M36 |
| Property Class | Class 5, 8, 10 |
| Standards | ISO | DIN | ASME |
| Insert Material | Nylon (PA6/PA66) |
2. Surface Lab
| Zinc Plated | ISO 4042 (Cr3+) |
| Zinc Flake | ISO 10683 |
| Specialty | Waxing for Torque Control |
3. QC Lab
| Torque Test | ISO 2320 Prevailing |
| Hardness | Vickers / Rockwell |
| Certifications | Full MTC 3.1 / PPAP III |
📊 ISO 7040 Dimensional Matrix (Standard Height Style 1)
📥 DOWNLOAD OFFICIAL TECHNICAL DATA SHEET (TDS)
Customized Fastening Solutions & Drawing Support
Send us technical drawings or assembly requirements for optimized locking solutions.
* Professional factory-direct consultation.
🛡️ LONGZE STRATEGIC RISK MANAGEMENT & RESILIENCE
- Locking Risk: ISO 2320 first and fifth removal torque verification.
- Material Risk: Proof load testing to ensure property class compliance.
- Insert Integrity: Temperature stability checks for nylon ring retention.
- Compliance Risk: REACH/RoHS declaration for chemical substance safety.
- Component Buffer: Inventory of high-grade PA66 nylon locking rings.
- Volume Ready: Automated multi-spindle tapping and insert assembly lines.
- Redundancy: Secondary heat treatment partners for hardened lock nuts.
- Transparency: Batch-coded traceability from steel coil to assembly node.
Quality Guarantee: Any deviation from the signed TDS or PI is subject to 100% replacement after verification. We guarantee locking performance for every batch.
Secure Shipping: Moisture-resistant packaging and photographic evidence of loading provided for every container to ensure cargo arrives intact.
ISO 7040 & DIN 985 Technical FQA
A: The main difference is the height. ISO 7040 is a "Style 1" nut with a higher body, offering more thread engagement and generally higher proof load capacity than the DIN 985 "Thin Type".
A: Yes, per ISO 2320, they maintain prevailing torque for up to 5 reuses. However, for critical safety applications, we recommend replacement once removed.
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