Product Parameters
| Item | Specification |
|---|---|
| Material | Carbon Steel, Stainless Steel (316) |
| Flange Type | Top flange (distorted thread pattern) |
| Thread | Metric (M6–M24), Imperial (1/4"–1") |
| Application | Automotive, machinery, equipment |
| Surface | Zinc plated, hot-dip galvanized, plain |
| MOQ | 50 pcs |
description
Hex flange lock nuts combine the bearing area of a flange with the locking function of a distorted thread pattern - the flange distributes the clamping load over a larger area, while the distorted threads at the top of the nut grip the bolt thread and prevent loosening from vibration. The flange eliminates the separate washer that a standard hex nut would require - the integrated flange provides the bearing surface and reduces parts count and assembly time. The flange also helps the nut center on the bolt during assembly, making installation easier. The locking function comes from the distorted thread pattern at the top of the nut - the threads are slightly deformed to create an interference with the bolt thread. When the nut is assembled, the bolt thread must pass through the distorted section, creating the frictional resistance that prevents loosening.
How the Distorted Thread Actually Locks
The distorted thread section at the top of the nut is slightly smaller than the nominal thread diameter. When the bolt passes through, the threads deform elastically, creating an interference that resists rotation. The nut does not spin freely until it passes through the distorted zone - which is why you feel a distinct increase in torque as the nut seats. This is normal and indicates the locking function is engaged. If the nut spins freely the entire way, the thread engagement is wrong.
FAQ
Q1: MOQ?
A1: 50 pieces for standard flange lock nuts.
Q2: Materials?
A2: Carbon steel and 316 stainless.
Q3: Surface finishes?
A3: Zinc plated (indoor), hot-dip galvanized (outdoor), plain.
Q4: Locking mechanism?
A4: Distorted thread pattern at top of nut - grips bolt thread when assembled.
Q5: Reusability?
A5: Limited. The distorted thread deforms during installation.
Q6: Custom configurations?
A6: Yes. Custom sizes, materials, flange configurations.
Quality is non-negotiable in precision manufacturing. Every component undergoes rigorous inspection at each stage of production.
- IATF 16949 - Automotive quality management system for safety-critical components
- PPAP / PPF - Production Part Approval Process documentation available on request
- AIAG Core Tools - APQP, FMEA, SPC, and MSA documentation on demand
- Passivation / Electropolishing - ASTM A967 procedures for corrosion resistance
- Material Traceability - Heat number tracking from raw material to finished part
From raw material to finished product, every step is controlled and documented:
- Wire / Bar Preparation - Cold heading or CNC blanking to near-net shape
- Thread Rolling / Cutting - Thread rolling for rolled threads or die cutting for cut threads
- Heat Treatment - Case-hardening or through-hardening for strength requirement
- Surface Treatment - Plating, coating, or passivation as specified
- Final Inspection - Dimensional check, torque testing, and surface inspection
- Packaging - Bulk bag, polybag, or plastic tub with labeling and traceability
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