Description

Product Overview

This precision-engineered T-shaped flange mounting hollow tube is a critical interface component designed specifically for the automotive industry. Manufactured using advanced multi-axis CNC machining, this stainless steel fitting ensures reliable media conduction (coolant, oil, or exhaust gas) and secure bolted mounting. Whether used as a protective sheath for temperature sensors or a fluid sampling probe, our CNC-machined parts deliver exceptional durability and sealing performance in extreme engine environments.

CNC Machining Services & Technical Specifications

To assist engineers and procurement specialists, we provide standard parameter options for this custom CNC machined sensor base. All dimensions, threads, and hole patterns can be tailored to your specific drawings.

Application Scenarios

This highly durable flange fixing hollow pipe bridges the gap between automotive sensors and engine fluid systems. Specific applications include:

• Automotive Engine Thermal Management: Serves as a mounting base for Coolant Water Temperature (CWT) sensors, inserted directly into the engine cooling circuit to monitor overheating risks.

• Engine Oil Pressure Systems: Acts as a fluid passage hub for oil pressure transmitters. The flange is bolted to the oil pan or engine block, allowing the hollow pipe to draw oil samples or monitor pressure in real-time.

• Exhaust Gas Temperature (EGT) Monitoring: Functions as a protective high-temperature sheath for EGT sensors in diesel engine exhaust manifolds, withstanding extreme thermal shocks and corrosive exhaust gases.

• Industrial Automation & Fluid Power: Adaptable for pneumatic/vacuum detection probes, fluid sampling bases on automated production lines, and hydraulic pressure test ports.

Material Analysis: Why Stainless Steel?

For engine and fluid environments, material choice is paramount. We predominantly use Stainless Steel 304 and 316L due to:

• Exceptional Corrosion Resistance: Resists rust and pitting caused by coolants, engine oils, and acidic exhaust condensation.

• High Temperature Tolerance: Handles continuous exposure to hot engine fluids and exhaust gas temperatures (up to 800°C for EGT applications if using specialized high-temperature stainless grades).

• Structural Integrity: Unlike aluminum, stainless steel offers higher mechanical strength, ensuring the hollow pipe does not deform or fracture under severe vibration and thermal expansion cycles.

(Note: For automotive applications requiring lightweight weight reduction, Aluminum 6061-T6 is also available upon request).

Tolerance Capability

We pride ourselves on precision machining to meet stringent automotive standards:

1. Flange Bottom Flatness: Controlled to ≤ 0.01 mm to ensure a perfect seal against the engine block gasket, preventing fluid leakage.

2. Concentricity: The coaxiality between the hollow pipe inner diameter (ID) and the flange center hole is held to 0.02 mm maximum, ensuring smooth, centered insertion of sensor probes.

3. Thread Pitch Accuracy: Our in-house CNC tapping ensures threads comply with 6H (ISO) / 2B (ANSI) standards, guaranteeing secure mounting without cross-threading.

Manufacturing Challenges & Our Solutions

This part is visually simple, but machining it poses significant engineering challenges. Here is how we solve them:

• Challenge 1: Thin-Walled Hollow Tube Deformation.

  • The Issue: Cutting a long, slender hollow tube creates high cutting forces, causing “chatter” (vibration) or wall distortion during CNC turning.

  • Our Solution: We utilize sub-spindle synchronization and custom soft jaws/dedicated fixtures that clamp evenly along the flange base and the tube edge, greatly reducing vibration and maintaining tight wall thickness tolerances.

• Challenge 2: Concentricity of Hollow Tube vs. Flange.

  • The Issue: If the pipe is welded to the flange or machined separately, misalignment occurs.

  • Our Solution: We employ single-setup Mill-Turn technology. The hollow tube and the T-shaped flange are machined from a single solid stainless steel bar in one continuous operation. This eliminates cumulative clamping errors, guaranteeing perfect perpendicularity and concentricity.

• Challenge 3: Internal Burr Removal.

  • The Issue: Drilling the central through-hole (as seen in Figure 2) leaves internal burrs that can break off and contaminate engine oil or sensor tips.

  • Our Solution: We perform a specialized internal deburring process using high-pressure coolant flush and specific micro-drill chamfer tools, followed by a thorough ultrasonic cleaning phase.

Frequently Asked Questions (FAQ)

Q1: Can I use this part for both pressure sensors and temperature sensors?
A: Absolutely. The hollow tube design allows for insertion of both thin-film temperature probes and fluidic pressure transmitters. Depending on the sensor diameter, we can customize the inner diameter (ID) of the pipe to perfectly match your probe dimensions.

Q2: What if I need this part to handle high-pressure hydraulic fluid (over 50 Bar)?
A: For high-pressure applications, we recommend our 3-thread hole flange version (the second image). The extra center bolt provides additional clamping force against the O-ring or gasket, preventing blowouts. We also recommend using 316L stainless steel over 304 for superior pressure fatigue resistance.

Q3: Is there a minimum order quantity (MOQ)?
A: We support both low-volume prototyping (MOQ: 1–10 pcs) for R&D testing and mass production (MOQ: 500+ pcs) for OEM/ODM automotive suppliers. We adjust the unit price based on batch quantity.

Q4: What packaging do you use to protect the precision surfaces during shipping?
A: Each flange base is individually wrapped in anti-corrosion VCI paper to prevent oxidation, then placed in custom EPE foam cutouts inside rigid master cartons. This ensures the flange seat and threaded holes arrive scratch-free and ready for installation.