Custom CNC Machining Stainless Steel Knurling Parts

Metal Knurling Process:

1. Process Principle

Knurling is achieved through cold deformation using specialized tools (knurling wheels or dies) that displace the metal surface without removing material. The process generates raised patterns, typically in straight, diagonal (diamond), or cross-hatched configurations, depending on tool design and machine settings.

2. Types of Knurling

3. Key Equipment & Tools

• Knurling Tools:
  • Knurling Wheels: Made of high-speed steel (HSS) or carbide, available in standard patterns (e.g., 30°, 45° angles for diamond knurling).
  • Knurling Dies: Used in hydraulic presses for heavy-duty applications (e.g., large-diameter shafts).
• Machines:
  • Lathes: Most common for cylindrical parts (e.g., axles, knobs).
  • CNC Machining Centers: Enable precise control over pattern depth and spacing.

4. Process Parameters

• Pressure/Feed Rate: Higher pressure increases pattern depth but risks surface cracking.
• Speed: Moderate rotational speeds (e.g., 50–200 RPM on lathes) prevent tool overheating.
• Lubrication: Cutting fluid reduces friction and extends tool life (e.g., soluble oil for steel).

5. Material Considerations

• Soft Metals (Aluminum, Brass): Require lower pressure to avoid deformation.
• Hard Metals (Stainless Steel, Titanium): Demand carbide tools and slower feed rates.
• Surface Preparation: Clean, burr-free surfaces ensure uniform knurling quality.

6. Applications

• Automotive:
  • Knurled steering wheel spokes and gear shift knobs improve driver control.
• Consumer Electronics:
  • Diamond-knurled battery compartments prevent slippage during replacement.
• Medical Devices:
  • Textured handles on surgical instruments enhance grip under sterile conditions.
• Industrial Fasteners:
  • Knurled nuts and bolts resist loosening due to vibration.

7. Quality Control

• Visual Inspection: Check for pattern clarity and consistency.
• Dimensional Measurement: Use micrometers to verify depth (typically 0.1–0.5 mm) and pitch (spacing between ridges).
• Surface Finish: Ensure Ra value meets specifications (e.g., Ra ≤ 1.6 μm for decorative parts).

8. Advantages & Limitations

Advantages:

• Cost-effective for high-volume production.
• No material loss (unlike milling or grinding).
• Enhances both function and appearance.

Limitations:

• Not suitable for very thin-walled or fragile parts.
• Tool wear requires periodic replacement.

9. Advanced Techniques

• Laser Knurling: Non-contact method for micro-patterns on delicate surfaces (e.g., semiconductor components).
• Roll Knurling with CNC: Combines automation with high precision for complex geometries.

Example Sentence for Technical Reports:
"The diamond knurling process on stainless steel shafts achieved a surface roughness of Ra 0.8 μm, improving torque transmission by 30% compared to smooth surfaces."

Supported Materials

We offer CNC machining services for a wide variety of industrial-grade metals and engineering plastics:

Metal Materials:

Aluminum Alloys: 2000 series, 5052, 6061, 7075 — lightweight, corrosion-resistant, ideal for structural parts and enclosures.

Stainless Steels: SUS303, SUS304, SS316, SS316L, 17-4PH — perfect for high-strength and corrosion-resistant applications in medical and marine fields.

Carbon & Alloy Steels: 1214L, 1215, 1045, 4140, SCM440, 40CrMo — engineered for toughness and wear resistance.

Brass & Bronze Alloys: C260, C360, H59–H70, H62, H65, H68, H70, copper — excellent for precision fittings, electronics, and decorative elements.

Titanium: Grade F1 to F5 — known for its high strength-to-weight ratio, ideal for aerospace and biomedical components.

Engineering Plastics:

Acetal (POM), Nylon (PA), PMMA (Acrylic), PVC, Polyurethane, PTFE (Teflon), PEEK, and more — selected for electrical insulation, chemical resistance, and low friction.

Not sure which material fits your project? Our engineers can help you select the best option based on application and cost-efficiency.

Surface Finishing Options

We provide a full spectrum of surface finishing services to improve durability, functionality, and appearance:

Anodizing: Hard and decorative finishes for aluminum components.

Bead Blasting: Creates a uniform matte texture.

Brushing / Polishing: Enhances surface aesthetics and touch feel.

Plating: Zinc, Nickel, Chrome, Titanium — for corrosion and wear resistance.

PVD Coating: Advanced wear-resistant coatings for luxury-grade components.

Powder Coating / Painting: Durable color finish options for visual impact.

Passivation / Electropolishing: Ideal for stainless steel corrosion resistance.

Knurling, Laser Etching & Engraving: Custom logos, textures, and grip patterns.

All finishes are tested for adhesion, thickness, and durability to ensure long-term performance.

Why Customers Choose Us:

• Design-to-Part Consultation– Submit your CAD model and get DFM analysis within 24h
• Material Versatility– From titanium and stainless steel to PEEK and nylon
• Precision Matters– Tolerance capability up to ±0.005 mm with full inspection reports
• Rapid Lead Time– Efficient prototyping and low-volume runs as fast as 5–7 days
• Traceable Quality– All components tagged and recorded for full traceability

Industries We Serve:

• Aerospace sensor casings, brackets
• Medical equipment shell & insert plates
• Automation end-effectors and fixture components
• Robotics rotating joints and arms
• Custom connectors and adapter fitting

Our CNC Machining Capabilities:

Machines

• Multi-axis CNC milling (3, 4, 5-axis)
• Turn-mill centers for complex geometries
• Precision Swiss lathes

Operations

• Pocket milling, contour cutting
• Deep hole drilling
• Internal threading
• Surface contouring

Quality is Engineered, Not Assumed

We implement a 3-step quality assurance system, covering:

• Pre-machining verification (tolerance and fixture simulation)
• In-process dimensional control
• Final QC with CMM, roughness testers, and hardness gauges
  Every part comes with an inspection summary upon request.

From Prototype to Production

Need 1 prototype for testing? Or a 500-piece batch for validation?
We support flexible order volumes. With in-house programming and digital job tracking, we reduce turnaround time while maintaining exceptional accuracy.

Get a Fast Custom Quote

Submit your STEP, IGS, or PDF drawing — our engineering team will analyze and provide:

• Full cost breakdown
• Lead time estimate
• Material & finish recommendations
• DFM feedback (design for manufacturability)

Contact Our CNC Experts！