304 Stainless Steel Capillary Thread Side Hole Puncture Needle
304 Stainless Steel Capillary Thread Side Hole Puncture Needle
Product Description
The 304 Stainless Steel Capillary Threaded Side-Port Puncture Needle is a precision-engineered, multifunctional component designed for secure, sealed, and precise fluid access in demanding applications. It combines a fine-bore capillary tube for handling small volumes, a threaded section (hub or shaft) for robust mechanical connection and sealing, and one or more precision side ports (holes) for alternative fluid egress. This integrated design allows for side-delivery or sampling, while the threads ensure a leak-proof, vibration-resistant interface. Manufactured from durable 304 stainless steel, it is ideal for high-pressure systems, analytical instrumentation, and specialized industrial processes where reliability and precision are paramount.
Product Processing
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Material Preparation & Tubing Selection: High-quality 304 stainless steel capillary tubing with precise inner and outer diameters is selected, cut to length, and cleaned.
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Side-Port Machining (Key Process 1): Using precision micro-drilling or Electrical Discharge Machining (EDM), one or more side ports are created at specified locations along the needle shaft. The process ensures accurate hole diameter, positioning, and clean, burr-free edges.
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Thread Machining (Key Process 2): Threads are precision-cut onto the component:
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Option A (Hub Threading): A separate hub is machined with internal or external threads (e.g., 10-32 UNF, M6x1) and then permanently attached to the capillary tube via laser welding or brazing.
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Option B (Direct Shaft Threading): A section of the capillary tube itself is precision-ground or turned to create external micro-threads.
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Tip Formation: The distal end of the capillary tube is ground to a specific point geometry. This can be a sharp lancet point for piercing septa, a pencil point for non-coring applications, or a blunt tip if used solely for fluid transfer through the side port.
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Joining & Finishing: For hub assemblies, the joint between the capillary tube and hub is finished to ensure strength and leak integrity. The entire assembly then undergoes electropolishing and chemical passivation to achieve a smooth, corrosion-resistant surface finish.
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Rigorous Testing & Inspection: 100% inspection includes dimensional checks (OD, ID, thread fit, side-port location/size), helium leak testing or pressure testing to ensure side-port and thread seal integrity, and functional flow testing.
Product Applications
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High-Pressure Chromatography (HPLC/GC): As a sealed, threaded injection port needle or a sample introduction probe with a side port for sheath gas or alternate flow paths.
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Chemical & Process Instrumentation: For sealed sampling from pressurized vessels or pipelines, where the threaded connection ensures safety and the side port allows sampling away from pipe sediment.
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Fluid Power & Pneumatic Systems: As a high-pressure injection or bleed valve component where the threaded connection is critical and fluid is directed laterally.
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Specialized Medical Device Manufacturing (Process Equipment): Used in assembly or filling machinery for precise, sealed delivery of adhesives or fluids (not for direct patient use unless specified as medical grade).
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Research & Development: Custom fluidic interfaces for lab-scale reactors or analytical setups requiring secure connections and specific flow geometries.
Product Technical Parameters (Detailed Table)
| Category | Parameter | Specification / Details |
|---|---|---|
| Material | Primary Material | 304 Stainless Steel (AISI 304, UNS S30400) |
| Alternative for Harsh Chemicals | 316L Stainless Steel | |
| Capillary Tube | Outer Diameter (OD) | 0.5 mm to 2.0 mm (e.g., 22G to 14G equivalent) |
| Inner Diameter (ID) | 0.2 mm to 1.4 mm | |
| Wall Thickness | 0.15 mm to 0.3 mm | |
| Side-Port Specifications | Port Diameter | 0.15 mm to 1.0 mm |
| Number of Ports | 1, 2 (opposed), or custom array | |
| Port Location | Distance from tip or reference plane, tolerance ±0.1 mm typical | |
| Port Edge Quality | Deburred, smooth finish to prevent clogging and turbulence | |
| Thread Specifications | Thread Location | Proximal end (most common for hub connection) |
| Thread Type | Common: 10-32 UNF, 1/4-28 UNF, M6x1.0, 1/8" NPT. Custom threads available. | |
| Thread Fit & Class | Typically Class 2A/2B or 3A/3B per ASME/ISO standards. | |
| Tip Configuration | Point Types | Lancet (Sharp), Pencil Point (Non-Coring), Blunt/Flat |
| Bevel Angle | Customizable (e.g., 20°, 30°) for lancet points | |
| Performance | Primary Flow Path | Fluid can be directed through the end tip, the side port(s), or both, depending on design and sealing. |
| Pressure Rating | High. Dependent on wall thickness, braze/weld integrity, and thread design. Can be engineered for very high pressure (> 5000 psi). | |
| Leak Integrity | Tested under specified pressure (e.g., with helium leak detector or hydrostatic test). | |
| Surface & Finish | Standard Finish | Passivated per ASTM A967. Electropolished optional for ultra-smooth bore. |
| Surface Roughness (Ra) | External/Internal: ≤ 0.8 µm (Electropolished: ≤ 0.4 µm). | |
| Quality & Compliance | Dimensional Inspection | 100% for critical dimensions: OD, ID, thread major/pitch diameter, side-port location & size. |
| Functional Testing | 100% pressure/leak test. Flow test per specification. | |
| Material Certification | Mill Test Certificate (MTC) per EN 10204 3.1 available. | |
| Packaging |
Protective packaging (foam, plastic tubes) to prevent damage to threads, tip, and side ports.
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