Micro pin made of brass, precisely CNC machined, suitable for use in miniature electronic circuits. Custom Precision Brass Test Probe Pin – CNC Turned Connector Parts
High - precision CNC machined micro pins measured by digital calipers, showing 0.37mm diameter, ideal for electronics assembly. Precision Brass Micro Pin – CNC Turned for Electronics & Connectors

Brass Stepped Connector Pin with Retention Hole – CNC Machined

  • Material: Brass C3604 / CuZn39Pb3 (other brass alloys on request)

  • Diameter: diameters 0.5–4.0 mm; overall length customizable (example part shown ~10–30 mm)

  • Length: 1 mm – 20 mm

  • Tolerance: ±0.01 mm or better

  • Surface Finish: Polished, Ra ≤ 0.8 μm

  • Production Process: Precision CNC Turning & Milling

  • Application Fields: Electronics, Medical Devices, Instrumentation, Micro-Mechanical Systems

  • MOQ: 1000 pcs (Small batch orders accepted)

  • Performance features: stepped shoulders for reliable axial positioning, retention hole for snap-pin or rivet, stable mechanical fit, good conductivity if plated

  • Customization: Available for size, material, and design

  • Packaging: Anti-static bags or customized packing for safe transport

  • Lead Time: 7–15 days depending on order quantity

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This brass stepped connector pin with a retention hole is a precision-turned component engineered for reliable mechanical positioning and electrical or mechanical connection in compact assemblies. Manufactured on Swiss-type CNC turning centers, each pin features accurately controlled stepped shoulders that locate against housings or insulators and a precision cross-drilled retention hole for snap rings, rivets, or indexing pins.

Key parameters: typical diameters range from 0.5 mm to 4.0 mm with lengths customizable to your drawing. Standard production tolerances are ±0.01 mm, with tighter tolerances available for high-precision applications. Surface finishing options include gold plating (for best conductivity and corrosion resistance), nickel plating (wear resistance), and tin plating (solderability).

Where it’s used: these stepped pins are commonly used in electrical connectors, handset assemblies, PCB connector housings, test probes, miniature valves, and sensor mounts. Their stepped geometry simplifies assembly by providing controlled shoulder bearings and mechanical stops, while the retention hole enables secondary fastening or indexing during assembly.

Why choose this part: the combination of Swiss-turning accuracy, tight shoulder concentricity, and consistent cross-hole placement makes this component ideal when small form-factor reliability matters. Our in-house process control (CMM verification, batch traceability, and plating QA) ensures consistent fit and finish for both prototype runs and high-volume production.

Our CNC Machining Facilities & Capabilities

At JXD Machining, we operate a 5,000+ square meter fully integrated CNC machining facility, armed with a fleet of 40+ advanced pieces of equipment to meet diverse customization demands. Our core equipment lineup includes: 12 sets of 3-axis CNC milling centers (Haas VF-2), 8 sets of 4-axis machining centers (DMG MORI CMX 1100 V), 5 sets of high-precision 5-axis milling centers (MAZAK Variaxis i-700), 10 sets of CNC turning lathes (Okuma LT2000-MY), 3 sets of Swiss-type automatic lathes (Citizen M32), and a complete Surface Treatment line covering anodizing, sandblasting, and powder coating.

 

We excel in both flexible rapid prototyping and stable high-volume production: we support 1-50 pieces of rapid sampling and 10,000+ pieces of mass production, with the ability to process over 20 Materials including Aluminum(6061/7075), Stainless Steel(304/316), Titanium alloy (TC4), Brass, and engineering Plastics ( POM  / PEEK ). With a strict tolerance control range of ±0.005mm to ±0.05mm, we easily handle complex structures such as deep holes, curved surfaces, and multi-step components, serving key industries like Electronics, Medical devices, Consumer Products, and Industrial Automation.

On delivery efficiency, we balance speed and precision: rapid prototyping takes 3-5 working days, small-batch production (50-500 pieces) is completed in 7-10 working days, and large-volume orders are delivered within 15-25 working days (adjustable based on order scale and complexity).

Want to see our workshop layout, equipment, and production process? Click here for our “About Us” page.

 

Quality Assurance

At JXD Machining, our strict, streamlined quality & outbound process—backed by advanced tools—guarantees compliance:

Incoming Check: Verify raw material certificates + sample tests (hardness, composition) to rule out defects.

In-Process Inspection: Spot-check critical stages with CMMs to validate tolerances (±0.001mm) early.

100% Final Test: Full dimensional, surface roughness, and functional checks—only passers move forward.

Outbound Review: Secure packaging + batch labeling; test reports/certifications included for traceability.

Every component leaves ready to meet your standards. Learn more & view certificates → Click here

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