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Jiali Machine Thread Screws in Micron-Level Torque Control for TWS PCB
ZHUHAI JIALI HARDWARE CO., LTD.
Jiali Machine Thread Screws in Micron-Level Torque Control for TWS PCB
TWS earphones demand extreme precision on PCB assembly. Jiali PMS-series machine thread screws feature Ra≤0.15μm ultra-precision threads, achieving ±0.02 N·m micron-level torque control on 0.4mm FR-4 PCB — yield rate up to 99.97%.
1. Torque-Tensile Performance (GB/T 3098.1)
| Size | Min. Tensile Strength (N) | Recommended Torque (N·m) | Torque Tolerance (±N·m) | Measured CV Value |
|---|---|---|---|---|
| M1.0×0.25 | ≥320 | 0.035 | 0.002 | 1.8% |
| M1.2×0.25 | ≥480 | 0.045 | 0.002 | 1.9% |
| M1.4×0.3 | ≥650 | 0.055 | 0.002 | 2.0% |
2. AirPods Pro 3 PCB Validation (SZ2026-PMS-02)
• Condition: 10⁶ vibration cycles (5–2000 Hz, 12g acceleration)
• Results:
✓ Torque decay ≤ 0.003 N·m (initial 0.035 → final 0.032)
✓ No PCB pad cracking or delamination
✓ Zero detachment (100% retention)
3. Jiali PMS Series Advantages
✓ Laser profile inspection (100% full check)
✓ Open torque-tensile database (scan QR code for live curve)
✓ Customization: Non-standard lengths (0.6–3.0mm), special heads (pan/countersunk)
✓ Surface finishes: RoHS trivalent chromium, Dacromet® (DIN 50961)
All Jiali machine thread screws undergo full-spectrum GB/T 3098.1 testing. A Torque-Tensile