The foundational straight coupling of high-pressure fluid systems, Pioneer Industries Brass Double Ferrule Unions connect two equal-diameter tubing runs with dual twin-ferrule swaging, guaranteeing 100% helium-leak-tight reliability up to 5,000 PSI.
The Brass Double Ferrule Union is the essential straight tube-to-tube connector in high-pressure pneumatic, hydraulic, and process instrumentation networks. It provides a direct, uninterrupted coupling between two pieces of fractional or metric tubing of the same outside diameter.
Engineered from high-tensile extruded brass bar stock (ASTM B16 Alloy C36000), each union body features mirror-finished internal seating cones and precision-matched twin ferrules that swage cleanly into the tube wall, delivering zero-torque make-up and high resistance to vibration fatigue.
Manufactured by Pioneer Industries Mumbai and exported worldwide to automation builders, analyzer shelter fabricators, offshore oil skids, and laboratory installations.
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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Pioneer straight unions feature CNC-honed internal bores that match tube internal diameters, eliminating flow restriction, pressure drops, and fluid turbulence.
Each union incorporates Pioneer proprietary silver-plated nut threads to prevent galling, allowing rapid assembly and repeated remakes in demanding industrial environments.
Metric tubing sizes 3 mm to 25 mm OD (MPU Series) and fractional sizes 1/8" to 1" OD (IPU 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 | E mm | h mm | H mm | F | G | l | L | Working Pressure |
|---|---|---|---|---|---|---|---|---|---|
| MPU – M 02 | 2 | 1.7 | 12 | 12 | 12.9 | 15.3 | 22.4 | 35.6 | 5,000 PSI / 345 Bar |
| MPU – M 03 | 3 | 2.4 | 12 | 12 | 12.9 | 15.3 | 22.1 | 35.3 | 5,000 PSI / 345 Bar |
| MPU – M 04 | 4 | 2.4 | 12 | 12 | 13.7 | 16.1 | 24.1 | 37.3 | 5,000 PSI / 345 Bar |
| MPU – M 06 | 6 | 4.8 | 14 | 14 | 15.3 | 17.7 | 26.2 | 41.0 | 5,000 PSI / 345 Bar |
| MPU – M 08 | 8 | 6.4 | 15 | 16 | 16.2 | 18.6 | 28.2 | 43.2 | 5,000 PSI / 345 Bar |
| MPU – M 10 | 10 | 7.9 | 18 | 19 | 17.2 | 19.5 | 31.0 | 46.2 | 5,000 PSI / 345 Bar |
| MPU – M 12 | 12 | 9.5 | 22 | 22 | 22.8 | 22.0 | 31.0 | 51.2 | 5,000 PSI / 345 Bar |
| MPU – M 15 | 15 | 11.9 | 24 | 25 | 24.4 | 22.0 | 31.8 | 52.0 | 5,000 PSI / 345 Bar |
| MPU – M 20 | 20 | 15.9 | 30 | 32 | 26.0 | 22.0 | 34.8 | 55.0 | 5,000 PSI / 345 Bar |
| MPU – M 22 | 22 | 18.3 | 30 | 32 | 26.0 | 22.0 | 34.8 | 55.0 | 5,000 PSI / 345 Bar |
| MPU – M 25 | 25 | 21.8 | 35 | 38 | 31.3 | 26.5 | 40.4 | 65.0 | 5,000 PSI / 345 Bar |
| Part No. | Tube O.D. T in | E Min | h in | H in | F | G | l | L | Working Pressure |
|---|---|---|---|---|---|---|---|---|---|
| IPU-01 | 1/16 | 1.27 | 5 | 5/16 | 8.63 | 10.91 | 17.50 | 25.15 | 5,000 PSI / 345 Bar |
| IPU-02 | 1/8 | 2.28 | 7/16 | 7/16 | 12.70 | 15.24 | 22.35 | 35.56 | 5,000 PSI / 345 Bar |
| IPU-03 | 3/16 | 3.04 | 7/16 | 1/2 | 13.71 | 16.00 | 24.13 | 37.33 | 5,000 PSI / 345 Bar |
| IPU-04 | 1/4 | 4.82 | 1/2 | 9/16 | 15.24 | 17.78 | 26.16 | 40.89 | 5,000 PSI / 345 Bar |
| IPU-05 | 5/16 | 6.35 | 9/16 | 5/8 | 16.25 | 18.54 | 28.19 | 42.92 | 5,000 PSI / 345 Bar |
| IPU-06 | 3/8 | 7.11 | 5/8 | 11/16 | 16.76 | 19.30 | 30.22 | 44.95 | 5,000 PSI / 345 Bar |
| IPU-08 | 1/2 | 10.41 | 13/16 | 7/8 | 22.86 | 21.84 | 30.98 | 51.30 | 5,000 PSI / 345 Bar |
| IPU-10 | 5/8 | 12.70 | 15/16 | 1 | 24.38 | 21.84 | 31.75 | 52.07 | 5,000 PSI / 345 Bar |
| IPU-12 | 3/4 | 15.74 | 1-1/16 | 1-1/8 | 24.38 | 21.84 | 33.27 | 53.59 | 5,000 PSI / 345 Bar |
| IPU-14 | 7/8 | 18.28 | 1-3/16 | 1-1/4 | 25.90 | 21.84 | 35.05 | 55.37 | 5,000 PSI / 345 Bar |
| 1 | 22.35 | 1-3/8 | 1-1/2 | 31.24 | 26.41 | 40.38 | 64.77 | 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 Union 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 Union components are deployed across demanding industrial instrumentation, process lines, and pneumatic circuits, including:
Coupling standard tubing lengths across long runs in chemical processing plants.
Interconnecting pneumatic distribution tubing in machine tool automation.
Providing leak-tight helium and nitrogen carrier gas lines in analytical labs.
Resisting salt air corrosion and continuous hydraulic pressure on marine platforms.
Connecting rigid brass tubing on hydraulic valve stands and pump supply loops.
Providing leak-free straight runs across factory floor pneumatic networks.
Coupling impulse lines connecting steam drums to level and pressure transmitters.
Reliable straight connections on deadweight testers and multi-gas calibration rigs.
Pioneer Industries’ Brass Double Ferrule Union 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 Union.
A Brass Double Ferrule Union is a straight fitting designed to couple two bare tubes of the same outside diameter, featuring twin-ferrule compression assemblies on both ends.
Rated up to 5,000 PSI (345 Bar) for sizes 1/8″ to 1/4″ and up to 3,200 PSI for 1/2″ size under ASME B31.3 instrumentation codes.
Metric Series MPU covers 3mm to 25mm tube OD, and Fractional Series IPU covers 1/8″ to 1″ tube OD.
Manufactured from premium extruded brass bar stock conforming to ASTM B16 Alloy C36000 / CW614N.
Insert tubing into each port until it bottoms against the internal stop shoulder, hand-tighten the nuts, and tighten 1-1/4 turns with a wrench (3/4 turn for 1/8″ and 3/16″).
Yes. Both joints can be disassembled and remade repeatedly by tightening approx. 1/12 to 1/6 turn beyond finger-tight.
No. The internal bore is precision-machined to match the internal diameter of standard heavy-wall tubing, providing full, unrestricted flow.
Yes. The patented rear ferrule provides dynamic vibration damping by gripping the tube firmly behind the primary front ferrule seal.
Yes, certified helium leak tight (< 1 × 10⁻⁹ mbar·l/s) down to -750 mmHg vacuum.
EN 10204 Type 3.1 Material Test Certificates, hydrostatic test records, and dimensional compliance 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.
