Stainless steel HL (Hair Line) surface treatment – suitable for semiconductor equipment and CNC precision parts
What is HL (Hair Line) Finish?
HL (Hair Line) finish is a surface treatment process that creates uniform, continuous, linear brushed patterns in a single direction on stainless steel surfaces using abrasive belts, wheels, or brushing tools. The fine lines resemble strands of hair, hence the name “Hair Line.”
Key Characteristics
- Consistent, unidirectional linear grain
- Matte, low-reflective surface appearance
- Clearly visible yet fine brushed texture
- Less prone to showing fingerprints and minor scratches compared to mirror finish (#8)
HL Processing Method
Typical process after CNC machining:
- Material Preparation
Common materials: SUS304 / SUS316 - Rough Polishing / Tool Mark Removal
Elimination of CNC machining marks and burrs - Brushing Process (HL Core Step)
Fixed-grit abrasive belts (e.g. #180 / #240 / #320)
➝ Brushing in a single, defined direction - Cleaning & Anti-Corrosion Treatment
Removal of polishing residue and oils
Comparison with Other Stainless Steel Finishes
- 2B: Smooth gray, low reflectivity – industrial/internal use
- BA: Bright surface, high reflectivity – appliances, decorative parts
- HL: Brushed matte, medium-low reflectivity – equipment housings
- #8 Mirror: Mirror-like, very high reflectivity – decorative/display use
Advantages & Considerations
Advantages
- Premium industrial appearance
- Reduced visibility of fingerprints and micro-scratches
- Suitable for large exterior surfaces
- Ideal combination with CNC precision machining
Considerations
- Grain direction must be clearly specified in drawings
- Secondary machining may damage the surface texture
- Deep scratches are difficult to repair locally
Typical Applications
- Semiconductor equipment covers and panels
- CNC machine enclosures
- Medical equipment exterior components
- Elevators, doors, industrial equipment
- Customized precision sheet metal parts
Drawing Specifications
- Surface Finish: HL / Hair Line Finish
- Grain Direction indicated by arrows
- Surface roughness: Ra 0.8–1.6 μm (as specified)
HL Finish for Semiconductor Equipment & CNC Precision Components
Stainless steel HL finish is widely used in semiconductor equipment and high-precision CNC components, offering an optimal balance between functional performance and refined appearance. By precisely controlling abrasive grain size and brushing direction, HL finish provides a consistent, low-gloss surface that enhances durability and visual quality.
When applied after CNC precision machining, HL finish ensures excellent dimensional accuracy, flatness, and surface consistency. Grain direction and surface roughness can be clearly defined in engineering drawings to meet stringent requirements for quality stability, repeatability, and international manufacturing standards in semiconductor equipment.
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