Custom CNC Turning Steel Pin and Fastener
Custom CNC turned steel pins and fasteners made to your drawing, CAD model, sample, or specified dimensions. These parts are ideal for positioning, alignment, fastening, pivoting, and mechanical assembly where standard catalog components fail to meet geometry or performance requirements.
Technical Specifications & Capability Matrix
|
Feature |
Standard Capability |
Precision / High-Spec Capability |
|
Diameter Tolerance |
±0.013 mm (±0.0005 in) |
Up to ±0.005 mm (±0.0002 in) |
|
Length Tolerance |
±0.05 mm (±0.002 in) |
Up to ±0.01 mm (±0.0004 in) |
|
Surface Roughness |
Ra 1.6 µm (Ra 63 µin) |
Ra 0.4 µm (Ra 16 µin) ground finish |
|
Thread Standards |
Metric (M), Unified Inch (UNC/UNF), Fine Threads |
Custom thread pitch, fit classes (2A/2B, 3A/3B) |
|
Concentricity / Runout |
0.02 mm (0.0008 in) |
Down to 0.005 mm (0.0002 in) |
|
Part Size Range |
Diameter: 2 mm – 150 mm |
Length: Up to 500 mm |
Steel Material Selection & Surface Finishing Guide
|
Material Group |
Common Grades |
Typical Applications |
Recommended Finish |
Key Advantage |
|
Carbon Steel |
1018, 1045, 12L14 |
General spacers, non-critical shafts, simple pins |
Zinc Plating, Black Oxide |
Cost-effective, good machinability |
|
Alloy Steel |
4140, 4340, 8620 |
Heavy-duty pivot pins, high-load studs, armatures |
Black Oxide, Thermal Heat Treatment |
High fatigue strength and core toughness |
|
Stainless Steel |
303, 304, 316, 17-4PH |
Marine, medical, hygienic, and outdoor assemblies |
Passivation, Electropolishing |
Superior corrosion resistance without plating |
|
Free-Machining Steel |
12L14, 11SMn30 |
High-volume turned components, standard fasteners |
Zinc Plating, Light Oiling |
Optimal chip control and superior surface finish |
Typical Custom Components & Machined Features
Components Produced
- Dowel & Locating Pins: Precision ground mating diameters for exact positioning.
- Shoulder & Pivot Pins: Controlled shoulder lengths for smooth pivoting or moving linkages.
- Grooved & Retaining Pins: Machined snap-ring grooves and retaining channels.
- Threaded Pins & Studs: External and internal threads with precise thread reliefs.
- Stepped Pins & Spacers: Multiple diameter steps with strict concentricity controls.
Integrated CNC Features
- Step turning, chamfering, and deburring
- External/internal metric and inch threading
- Retention grooves, snap-ring slots, and keyways
- Axial holes, cross holes, and wrench flats
- Knurling (straight or diamond pattern)
Quality Control & Inspection Protocols
Mating Diameters: Checked via micrometers and CMM for accurate clearance or interference fits.
Threads & Fits: Verified with pitch micrometers and thread ring/plug gauges.
Concentricity & Runout: Measured across multi-stepped features to prevent assembly binding.
Quality Documentation: Material Test Reports (MTR / Mill Certs), Certificate of Conformity (CoC), First Article Inspection (FAI) reports, and CMM measurement logs are available upon request.
FAQ
Q: What types of steel pins can be manufactured by CNC turning?
A: Common examples include dowel pins, locating pins, shoulder pins, pivot pins, grooved pins, threaded pins, stepped pins, retaining pins, spacers, and other custom cylindrical components.
Q: Can custom steel pins include threads and grooves?
A: Yes. Depending on the part design, external or internal threads, retaining grooves, shoulders, chamfers, holes, and other turned features can be included according to the drawing.
Q: What steel materials can be used for custom pins and fasteners?
A: Common options include carbon steel, alloy steel, stainless steel, and selected free-machining steel grades. The material should be selected according to the required strength, corrosion resistance, machinability, heat treatment, and operating environment.
Q: Can parts be manufactured directly from a customer drawing?
A: Yes. A 2D technical drawing is preferred when critical tolerances, threads, surface treatment, and inspection requirements need to be clearly defined. A 3D CAD model or physical sample can also support the manufacturing review.
Q: Can metric and inch threads be manufactured?
A: Metric and inch-based thread specifications can be considered when the drawing clearly defines the thread diameter, pitch, length, standard, and required fit or class.
Q: How are CNC turned steel pins inspected?
A: Inspection can include diameter measurement, length measurement, thread gauging, groove and shoulder measurement, hole inspection, concentricity or runout inspection, and visual inspection.
Q: Can steel pins receive corrosion-resistant surface treatment?
A: Yes. Depending on the material and application, potential options include zinc plating, black oxide, nickel plating, stainless steel passivation, polishing, and other specified finishing processes.
Q: What information is required for a quotation?
A: The most useful information includes the technical drawing or CAD file, material grade, quantity, critical tolerances, thread specification, surface treatment, heat treatment, inspection requirements, certification requirements, and packaging specifications.
Hot Tags: custom cnc turning steel pin and fastener, China custom cnc turning steel pin and fastener manufacturers, suppliers, factory, Stainless CNC Turning Ring
