Release time：2020-01-16 18:44 Browse：
The minimum perpendicularity (verticality) of extra-long screws depends on manufacturing precision, material stability, and length-to-diameter ratio. Generally:
Standard machining: ~0.1–0.3 mm/m
Precision grinding/lapping: 0.02–0.05 mm/m
Ultra-precision (e.g., aerospace/semiconductor): ≤0.01 mm/m
Key factors:
Process: CNC turning/grinding improves accuracy.
Material: Stress-relieved alloys reduce post-machining deformation.
Inspection: Laser/CMM measurement ensures compliance.
For critical applications, specify tolerance and collaborate with high-precision suppliers.
