ZHUHAI JIALI HARDWARE CO., LTD.

Jiali Set Screws Zero-Rebound Positioning for Optical Lens Focus Rings

Precision optical lenses demand axial locking accuracy up to ±0.5 μm on focus rings. Jiali PMS-SET series set screws feature a dual-conical + spherical contact structure, achieving zero rebound (ΔL ≤ 0.1 μm) after 10⁶ adjustments on ZEISS CP.2 cinema lens focus rings — the highest stability in the industry.

1. Core Parameters (ISO 4026 / DIN 916)

2. ZEISS CP.2 Focus Ring Validation (Report: SZ2026-SET-ZEISS-01)
• Test Conditions:
 - Thermal Cycling: -20°C ↔ +60°C (500 cycles)
 - Adjustment Frequency: 10 Hz, stroke ±1.2 mm
 - Total Cycles: 10⁶
• Results:
 ✓ Rebound displacement ΔL = 0.08 μm (<0.1 μm = “zero rebound”)
 ✓ Focus ring repeatability: ±0.3 μm (improved from initial ±0.5 μm)
 ✓ Clamping force decay: 1.2% (initial 125 N → final 123.5 N)

3. Jiali PMS-SET Series Advantages
✓ Dual-curved contact: 90° cone angle + precisely matched sphere radius (tolerance ±0.01 mm)
✓ Surface Finish: Ultra-hard DLC coating (hardness ≥ 3000 HV, friction coefficient ≤ 0.05)
✓ 100% automated inspection: Laser profile scan + 3D cone/sphere fitting per screw
✓ Customization: Non-standard lengths (M2.5×2.0–M4×6.0), special ends (flat/dome/cylindrical)

All Jiali set screws undergo full-spectrum ISO 4026 testing. An Optical