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
Type    Description    Applications
Straight Knurling    Parallel ridges for linear grip enhancement.    Shafts, handles, and adjustment knobs.
Diamond Knurling    Crisscross pattern forming diamond-shaped textures for optimal friction.    Tool grips, fasteners, and decorative parts.
Custom Knurling    Tailored patterns (e.g., logos, serial numbers) for branding or functional needs.    Luxury accessories, medical devices.

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.



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

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.