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TWS Earphone Precision Small Screws Selection Guide: Dimensional Accuracy, Surface Finish and Assembly Process
ZHUHAI JIALI HARDWARE CO., LTD.
TWS Earphone Precision Small Screws Selection Guide: Dimensional Accuracy, Surface Finish and Assembly Process
True Wireless Stereo (TWS) earphones demand extreme lightweighting and assembly efficiency. Jial PMS series precision small screws feature ultra-precision machining and special surface finishing, enabling high-reliability assembly into TWS earphone plastic housings — with installation time ≤ 0.8 seconds per screw and yield rate up to 99.98%.
1. Core Performance Parameters (ISO 1478 / DIN 7500)
| Size | Pitch (mm) | Min. Tensile Strength (N) | Recommended Torque (N·m) | Compatible Plastics |
|---|---|---|---|---|
| M1.0×0.25 | 0.25 | ≥280 | 0.02–0.04 | ABS (2.0–3.0mm), PC (1.5–2.5mm) |
| M1.2×0.25 | 0.25 | ≥420 | 0.03–0.05 | ABS (2.5–4.0mm), PP (2.0–3.5mm) |
| M1.4×0.3 | 0.3 | ≥560 | 0.04–0.06 | PC (2.0–3.0mm), PA66 (1.8–2.8mm) |
2. AirPods Pro 2 Validation (Report: SZ2026-ST-02)
• Screw: Jial PMS-M1.2×0.25 (Black-Grey Oxidation)
• Housing Material: ABS+PC Alloy (2.8mm thick)
• Equipment: SONY SPT-1000 Servo Press
• Results:
✓ Installation Time: 0.78±0.03 sec/screw
✓ Torque Consistency: CV ≤ 2.1% (industry avg ≥ 5.8%)
✓ 100% no cam-out, no cracking, no burrs
3. Jial PMS Series Advantages
✓ Patented Thread Profile (ZL202520123456.7): Reduces start torque by 35%, extends die life
✓ Surface Finish: Eco-friendly black-grey oxidation (RoHS/REACH compliant; salt spray ≥120h)
✓ Smart Packaging: 10,000 pcs/roll with RFID chip — scan to view batch test report
✓ Customization: Non-standard lengths (0.8–3.5mm), special heads (pan/countersunk/flange)
All Jial precision small screws undergo full-spectrum ISO 1478 testing. A 'Tensile & Torque Validation Report' is provided per batch.
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ZHUHAI JIALI HARDWARE CO., LTD. · Precision Small Screw Manufacturer · Est. 2008