316L Anti Fingerprint Stainless Steel Watch Parts Electroplating
Surface Treatment
Why Choose 316L as the Anti Fingerprint Watch Case?
1. Surface treatment compatibility: mirror polishing and coating
Mirror polishing (Ra ≤ 0.05 μ m)
Through multiple electrolytic polishing processes, micro pores on
the metal surface are eliminated, resulting in a surface finish
close to glass and significantly reducing the area of fingerprint
attachment.
Effect: Fingerprint residue reduced by 70% (compared to mechanical
polishing of 304 stainless steel).
PVD coating (such as diamond-like carbon DLC)
The coating thickness is 1-3 μ m, and the surface energy is reduced
to 18-22mN/m (about 45mN/m for bare metal), making it difficult for
grease to wet and spread.
Effect: Fingerprints are easy to wipe, and the coating hardness
reaches HV2000-3000, with a 5-fold increase in scratch resistance.
2. Resistance to sweat corrosion: chemical barrier of molybdenum
element
Ingredient advantage: 316L contains 2-3% molybdenum (Mo), which
reacts with chloride (Cl ⁻) in sweat to form a dense MoO ₂
passivation film.
Long term stability:After 5 years of daily wear, the corrosion pit
depth of 316L case should be ≤ 2 μ m (304 stainless steel
generally>10 μ m) to avoid fingerprint accumulation caused by
micro roughness.
Why Do We Choose Stainless Steel as the Raw Material for CNC
Components?
Stainless steel plays an important role in CNC machining and is a
high difficulty but high-value material. Its excellent corrosion
resistance, high strength, and high temperature resistance make it
suitable for high-end fields such as medical, chemical, and
aerospace, while its good processing performance and diverse
surface treatments support high-precision manufacturing of complex
parts. Despite the difficulty of processing, its durability,
reliability, and wide range of application scenarios make it an
indispensable material in CNC machining.
Advantages of Stainless steel CNC Machining:
Excellent corrosion resistance:
The corrosion resistance, high strength, high temperature
resistance, and hygiene characteristics of stainless steel make it
irreplaceable in fields such as chemical, automotive, aerospace,
food, and medical industries, making it an important material in
CNC machining.
High strength and hardness:
Stainless steel has high mechanical strength and hardness, and can
withstand high loads and impacts. In the fields of automotive,
aerospace, and construction, stainless steel parts are used to
manufacture high-strength structural components and critical parts.
High temperature resistance:
Some stainless steels (such as 310, 316) can still maintain their
mechanical properties and corrosion resistance at high
temperatures.
Hygiene and Cleanliness:
Stainless steel has a smooth and pore free surface, which is not
prone to bacterial growth and is easy to clean and disinfect.
Widely used in the fields of food, medicine, and pharmaceuticals to
meet strict hygiene standards.
CNC Machining Tolerance
| Precision Machining | Metals, PEEK, And
ULTEM with Drawing | Other Plastics
with Drawing | No Drawing |
| Linear Dimension | +/- 0.0025 mm
+/- 0.0001 inch | +/- 0.05 mm
+/- 0.002 inch | ISO 2768 Medium |
Hole Diameters
(Not Reamed) | +/- 0.0025 mm
+/- 0.0001 inch | +/- 0.05 mm
+/- 0.002 inch | ISO 2768 Medium |
| Shaft Diameters | +/- 0.0025 mm
+/- 0.0001 inch | +/- 0.05 mm
+/- 0.002 inch | ISO 2768 Medium |
Polestar Metal will be Your Trusted Partner!
Choosing our CNC machining services ensures not only precision and
quality but a partnership built on trust and reliability. At
Polestar Metal, we are committed to delivering excellence in every
aluminum component we produce. From prototyping to full-scale
production, we are equipped to meet your specific needs and bring
your designs to life.
