When sourcing or manufacturing lock cylinders with polished stainless steel finishes, understanding surface roughness parameters is essential for meeting buyer expectations. The Ra value (Arithmetic Average Roughness) is the most commonly specified parameter in B2B transactions on Alibaba.com, representing the average deviation of the surface profile from its mean line [1].
- Super Precision (Ra 0.025-0.2 μm): Achieved through polishing, lapping, or superfinishing
- Precision Machining (Ra 0.2-0.8 μm): Fine grinding, precision turning
- Ordinary Machining (Ra 0.8-3.2 μm): Standard CNC machining, milling
- Rough Machining (Ra 3.2-12.5 μm): Basic turning, drilling [1]
For polished stainless steel lock cylinders, manufacturers typically target Ra values between 0.05-0.2 μm through multi-stage polishing processes. This creates a mirror-like finish that not only enhances aesthetic appeal but also improves corrosion resistance and ease of cleaning—critical factors for both security hardware and hygiene-sensitive applications [1].
Polishing can achieve Ra 0.05-0.2 μm, making it suitable for applications requiring both aesthetic quality and functional performance. However, smoother surfaces come with significantly higher production costs [1].
It's important to note that Ra alone doesn't tell the complete story. The Rz parameter (Maximum Height of Profile) measures peak-to-valley height and can catch isolated defects that Ra might miss. For critical specifications, especially in pharmaceutical or food processing environments, buyers increasingly request both Ra and Rz values in their technical documentation [2].
