Providing a permanent or temporary dead-end pressure seal at the termination of instrumentation tubing lines, Pioneer Industries Brass Double Ferrule Tube Caps assemble onto tube ends with standard twin-ferrule swaging, rated up to 5,000 PSI.
The Brass Double Ferrule Tube Cap is engineered to seal the open end of a fractional or metric tube run. It comprises a blind fitting body with an internal seating taper, a standard double-ferrule set (front and back ferrules), and a compression nut.
When tightened onto the tube end, the twin ferrules swage securely into the outer wall of the tubing, creating a hermetic, pressure-containing seal capable of withstanding the full burst pressure of the tubing (up to 5,000 PSI) without blow-off under severe thermal cycling or hydraulic shock.
Manufactured by Pioneer Industries Mumbai and utilized across global process skids, offshore oil platforms, laboratory gas piping, and pneumatic machinery.
Components are precision CNC-machined from premium extruded brass (IS 319 / ASTM B16 / CW614N) with micro-smooth surface finishes. Every production lot undergoes rigorous metallurgical spectrometry, optical CMM dimensional checks, and helium leak detection, accompanied by authentic EN 10204 Type 3.1 Mill Test Certificates.
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Machined from high-density ASTM B16 brass bar stock, each cap features a precision blind cavity and 20° seating taper that guides ferrules into optimal contact.
The solid end-wall thickness is engineered with a 4:1 safety factor against hydrostatic burst, guaranteeing complete worker safety during high-pressure testing.
Metric tubing 3 mm to 25 mm OD (MTC Series) and fractional tubing 1/8" to 1" OD (ITC Series).
Explore comprehensive engineering dimensional configurations for Metric Series and Fractional Series, Operating Parameters, and Certified Metallurgy. Manufactured according to ASME B31.3, ISO 19879, and international instrumentation standards.
| Part No. | Tube O.D. T mm | h mm | H mm | F | G | l | L | Working Pressure |
|---|---|---|---|---|---|---|---|---|
| MPTC-02 | 2 | 12 | 12 | 12.9 | 15.3 | 13.5 | 20.1 | 5,000 PSI / 345 Bar |
| MPTC-03 | 3 | 12 | 12 | 12.9 | 15.3 | 13.5 | 20.1 | 5,000 PSI / 345 Bar |
| MPTC-04 | 4 | 12 | 12 | 13.7 | 16.1 | 14.7 | 21.3 | 5,000 PSI / 345 Bar |
| MPTC-06 | 6 | 14 | 14 | 15.3 | 17.7 | 15.7 | 23.1 | 5,000 PSI / 345 Bar |
| MPTC-08 | 8 | 15 | 16 | 16.2 | 18.6 | 17.0 | 24.5 | 5,000 PSI / 345 Bar |
| MPTC-10 | 10 | 18 | 19 | 17.2 | 19.5 | 19.0 | 26.6 | 5,000 PSI / 345 Bar |
| MPTC-12 | 12 | 22 | 22 | 22.8 | 22.0 | 19.0 | 29.1 | 5,000 PSI / 345 Bar |
| MPTC-15 | 15 | 24 | 25 | 24.4 | 22.0 | 19.8 | 29.9 | 5,000 PSI / 345 Bar |
| MPTC-16 | 16 | 24 | 25 | 24.4 | 22.0 | 19.8 | 29.9 | 5,000 PSI / 345 Bar |
| MPTC-18 | 18 | 27 | 30 | 24.4 | 22.0 | 21.3 | 31.4 | 5,000 PSI / 345 Bar |
| MPTC-20 | 20 | 30 | 32 | 26.0 | 22.0 | 23.9 | 34.0 | 5,000 PSI / 345 Bar |
| MPTC-22 | 22 | 30 | 32 | 26.0 | 22.0 | 23.9 | 34.0 | 5,000 PSI / 345 Bar |
| MPTC-25 | 25 | 35 | 38 | 31.3 | 26.5 | 26.2 | 38.5 | 5,000 PSI / 345 Bar |
| Part No. | Tube O.D. Tin | h in | H in | F | G | l | L | Working Pressure |
|---|---|---|---|---|---|---|---|---|
| IPTC-02 | 1/16 | 5/16 | 5/16 | 8.63 | 10.92 | 11.20 | 14.18 | 5,000 PSI / 345 Bar |
| IPTC-03 | 1/8 | 7/16 | 7/16 | 15.24 | 15.24 | 13.46 | 20.06 | 5,000 PSI / 345 Bar |
| IPTC-03 | 3/16 | 7/16 | 1/2 | 13.71 | 16.00 | 14.73 | 21.33 | 5,000 PSI / 345 Bar |
| IPTC-04 | 1/4 | 1/2 | 9/16 | 15.24 | 17.78 | 16.00 | 23.36 | 5,000 PSI / 345 Bar |
| IPTC-05 | 5/16 | 9/16 | 5/8 | 16.25 | 18.54 | 17.01 | 24.38 | 5,000 PSI / 345 Bar |
| IPTC-06 | 3/8 | 5/8 | 11/16 | 16.76 | 19.30 | 18.28 | 25.65 | 5,000 PSI / 345 Bar |
| IPTC-08 | 1/2 | 13/16 | 7/8 | 22.86 | 21.84 | 19.05 | 29.21 | 5,000 PSI / 345 Bar |
| IPTC-10 | 5/8 | 15/16 | 1 | 24.38 | 21.84 | 19.81 | 29.97 | 5,000 PSI / 345 Bar |
| IPTC-12 | 3/4 | 1-1/16 | 1-1/8 | 24.38 | 21.84 | 21.33 | 31.49 | 5,000 PSI / 345 Bar |
| IPTC-14 | 7/8 | 1-3/16 | 1-1/4 | 25.90 | 21.84 | 23.87 | 34.03 | 5,000 PSI / 345 Bar |
| IPTC-16 | 1 | 1-3/8 | 1-1/2 | 31.24 | 26.41 | 26.16 | 38.35 | 5,000 PSI / 345 Bar |
| Operating Parameter | Standard Specification | Severe Service / High-Pressure Rating |
|---|---|---|
| Fluid Media Compatibility | Compressed Air, Mineral Oils, Hydraulic Fluids, Inert Gases | Natural Gas, Vacuum lines, Steam & Glycol circuits |
| Working Pressure Range | Vacuum to 5,000 PSI (345 Bar) depending on tube size | Proof pressure tested to 1.5× design working pressure |
| Helium Leak Integrity | < 1 × 10⁻⁹ mbar·l/s | Suitable for ultra-clean analytical & vacuum systems |
| Temperature Envelope | -200°C to +200°C (-328°F to +392°F) | Cryogenic to moderate steam and hot oil service |
| Turns From Finger-Tight | 1-1/4 Turns (sizes 1/4" to 1" / 6mm to 25mm) | 3/4 Turn (sizes 1/16" to 3/16" / 2mm to 4mm) |
| Compatible Tubing | Seamless Copper (ASTM B75, B88), Brass (ASTM B135) | Nylon, PU, PTFE (with Pioneer brass tube inserts) |
Pioneer Industries manufactures Brass Double Ferrule Tube Cap using high-tensile extruded brass bar stock and forgings with controlled microstructural annealing:
| Component / Grade | Material Standard | Composition / Chemistry |
|---|---|---|
| Fitting Body / Bar | ASTM B16 / IS 319 Gr. 1 / CW614N | Cu: 60.0–63.0%, Pb: 2.5–3.7%, Fe: 0.35% Max, Zn: Balance |
| Forged Elbows / Tees | ASTM B283 / CW617N C37700 | Cu: 57.0–60.0%, Pb: 1.5–2.5%, Fe: 0.30% Max, Zn: Balance |
| Front & Back Ferrules | ASTM B16 / Cold-Worked Annealed | Controlled Alpha-Beta phase balance for clean collet swaging |
| Optional Naval Brass | ASTM B21 / CW712R C46400 | Cu: 59.0–62.0%, Sn: 0.5–1.0%, Pb: 0.20% Max, Zn: Balance |
Our manufacturing, swaging tolerances, and quality verification strictly adhere to international engineering benchmarks:
Brass Double Ferrule Tube Cap components are deployed across demanding industrial instrumentation, process lines, and pneumatic circuits, including:
Capping spare tubing lines on control panels and distribution headers for future hookup.
Temporarily capping line ends during site commissioning and pressure validation.
Safely capping sampling line outlets between periodic grab sample collection cycles.
Isolating process lines when gauges or transmitters are removed for recalibration.
Terminating unused auxiliary carrier gas lines inside analytical shelters.
Closing off terminal ends of main compressed air distribution tubing loops.
Corrosion-resistant dead-ending on shipboard pneumatic control lines.
Sealing auxiliary tubing ports on mobile equipment pending attachment installation.
Pioneer Industries’ Brass Double Ferrule Tube Cap components are trusted across critical global industrial sectors:
Expert engineering insights and technical guidance regarding swaging mechanics, pressure thresholds, tubing compatibility, and installation protocols for Brass Double Ferrule Tube Cap.
A Brass Double Ferrule Tube Cap is a fitting designed to seal the bare end of a tubing run, consisting of a blind cap body, front and back ferrules, and a compression nut.
A Tube Cap seals the open end of a bare tube. A Tube Plug inserts into and blanks off an open compression fitting port (such as an unused tee or manifold branch).
Metric Series MTC covers 3mm to 25mm tube OD, and Fractional Series ITC covers 1/8″ to 1″ tube OD.
Rated up to 5,000 PSI (345 Bar) for sizes up to 1/4″ and 3,200 PSI for 1/2″ size, fully meeting ASME B31.3 requirements.
Precision-machined from extruded brass bar stock conforming to ASTM B16 Alloy C36000 / CW614N.
Slide the nut and ferrules onto the tube end, insert the tube fully into the cap until it bottoms against the internal shoulder, finger-tighten, and advance 1-1/4 turns with a wrench (3/4 turn for 1/8″ and 3/16″).
Yes. The cap can be removed and remade multiple times by retightening approx. 1/12 to 1/6 turn beyond finger-tight.
Yes. You can cut the tube just behind the swaged ferrules with a tube cutter to reuse the run, or connect a union directly to the swaged end.
Yes, certified leak-tight to < 1 × 10⁻⁹ mbar·l/s down to -750 mmHg vacuum.
EN 10204 Type 3.1 Material Test Certificates, hydrostatic test records, and dimensional inspection reports.
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Note: Please note that the information on this document is for illustration purposes only as information may vary with individual products, their grade and applications industries or uses and therefore cannot be guaranteed as accurate. © Copyright 2026 by Pioneer Industries. All Rights Reserved.
