Engineered for leak-proof instrumentation tube routing across cabinet walls, machine partitions, and panel enclosures, Pioneer Industries Brass Double Ferrule Bulkhead Unions feature full-length external mounting threads, heavy-duty jam nuts, and dual-ferrule compression swaging rated up to 5,000 PSI.
The Brass Double Ferrule Bulkhead Union is a specialized pass-through tube fitting engineered to join two tubing runs securely through an enclosure, panel bulkhead, or structural partition. Designed with an extended barrel body and precision-cut metric or UNF mounting threads, it firmly clamps to panel partitions with dual brass hex jam nuts, eliminating tube abrasion and mechanical vibration transfer across wall boundaries.
Internally, twin-ferrule mechanical swaging on both ends ensures independent, hermetically sealed connections. As each nut is tightened 1-1/4 turns from finger-tight, the front ferrule forms a primary fluid-tight seal against the internal fitting taper, while the back ferrule collets the tubing O.D. to absorb dynamic impulse shocks and prevent tube twist.
Pioneer Industries manufactures and exports Brass Double Ferrule Bulkhead Unions to process automation builders, analyzer shelter fabricators, and pneumatic control OEMs in over 85 countries worldwide.
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 premium extruded brass bar stock (ASTM B16 C36000 / IS 319 Gr. 1), Pioneer Bulkhead Unions offer superior mechanical strength, corrosion resistance, and vibration isolation for high-pressure gas and liquid circuits.
Designed for panels up to 12.7 mm (1/2 inch) thickness, the fitting barrel withstands high tightening torques without stripping, maintaining bubble-tight integrity across vacuum to 5,000 PSI service.
Available in metric tubing sizes 2 mm to 25 mm OD (MPBU Series) and imperial sizes 1/16" to 1" OD (IPBU Series). Mounting threads range from M10x1.0 to M30x1.5 and 5/16-24 to 1-3/8-12 UNF.
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 | h1 mm | H mm | F | G | l | l 1 | L | L 1 | Panel Hole DrillSize | Max Panel Thickness | Working Pressure |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MPBU – 03 | 3 | 2.4 | 14 | 12.7 | 12 | 12.9 | 15.3 | 38.1 | 24.6 | 51.3 | 31.2 | 8.3 | 12.7 | 5,000 PSI / 345 Bar |
| MPBU – 04 | 4 | 2.4 | 14 | 14.3 | 12 | 13.7 | 15.3 | 40.4 | 25.4 | 53.6 | 32.0 | 9.9 | 12.7 | 5,000 PSI / 345 Bar |
| MPBU – 06 | 6 | 4.8 | 16 | 15.9 | 14 | 15.3 | 16.1 | 42.9 | 26.2 | 57.7 | 33.6 | 11.5 | 10.2 | 5,000 PSI / 345 Bar |
| MPBU – 08 | 8 | 6.4 | 16 | 17.5 | 16 | 16.2 | 17.7 | 46.0 | 28.6 | 61.0 | 36.1 | 13.1 | 11.2 | 5,000 PSI / 345 Bar |
| MPBU – 10 | 10 | 7.9 | 22 | 22.0 | 19 | 17.2 | 18.6 | 48.5 | 29.4 | 63.7 | 37.0 | 16.2 | 11.2 | 5,000 PSI / 345 Bar |
| MPBU – 12 | 12 | 9.5 | 24 | 23.8 | 22 | 22.8 | 19.5 | 50.8 | 31.8 | 71.0 | 41.9 | 19.5 | 12.7 | 5,000 PSI / 345 Bar |
| MPBU – 15 | 15 | 11.9 | 27 | 27.0 | 25 | 24.4 | 22.0 | 52.3 | 32.5 | 72.5 | 42.6 | 22.8 | 12.7 | 5,000 PSI / 345 Bar |
| MPBU – 16 | 16 | 12.7 | 27 | 27.0 | 25 | 24.4 | 22.0 | 52.3 | 32.5 | 72.5 | 42.6 | 22.8 | 12.7 | 5,000 PSI / 345 Bar |
| MPBU – 18 | 18 | 15.1 | 30 | 30.0 | 30 | 24.4 | 22.0 | 58.7 | 37.7 | 78.9 | 47.4 | 26.0 | 16.8 | 5,000 PSI / 345 Bar |
| MPBU – 20 | 20 | 15.9 | 35 | 35.0 | 32 | 26.0 | 22.0 | 64.3 | 42.9 | 84.5 | 53.0 | 29.0 | 17.0 | 5,000 PSI / 345 Bar |
| MPBU – 22 | 22 | 18.3 | 35 | 35.0 | 32 | 26.0 | 22.0 | 64.3 | 42.9 | 84.5 | 53.0 | 29.0 | 19.1 | 5,000 PSI / 345 Bar |
| MPBU – 25 | 25 | 21.8 | 41.3 | 41.3 | 38 | 31.3 | 26.5 | 71.4 | 45.2 | 95.9 | 57.5 | 33.7 | 19.1 | 5,000 PSI / 345 Bar |
| Part No. | Tube O.D. T in | E Min | h in | H in | F | G | l | l 1 | L | L 1 | Panel Hole DrillSize | Max Panel Thickness | Working Pressure |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| IPBU-01 | 1/16 | 1.27 | 5/16 | 5/16 | 8.63 | 10.92 | 23.87 | 13.46 | 31.50 | 17.27 | 5.16 | 3.05 | 5,000 PSI / 345 Bar |
| IPBU-02 | 1/8 | 2.28 | 1/2 | 7/16 | 12.70 | 15.24 | 38.10 | 24.63 | 51.30 | 31.24 | 8.33 | 12.70 | 5,000 PSI / 345 Bar |
| IPBU-03 | 3/16 | 3.04 | 9/16 | 1/2 | 13.71 | 16.00 | 40.38 | 25.40 | 53.59 | 32.00 | 9.92 | 12.70 | 5,000 PSI / 345 Bar |
| IPBU-04 | 1/4 | 4.82 | 5/8 | 9/16 | 15.24 | 17.78 | 42.92 | 26.16 | 57.65 | 33.52 | 11.50 | 10.16 | 5,000 PSI / 345 Bar |
| IPBU-05 | 5/16 | 6.35 | 11/16 | 5/8 | 16.25 | 18.54 | 45.92 | 28.44 | 60.70 | 35.81 | 13.09 | 11.17 | 5,000 PSI / 345 Bar |
| IPBU-06 | 3/8 | 7.11 | 3/4 | 11/16 | 16.76 | 19.30 | 47.49 | 29.46 | 62.23 | 36.83 | 14.65 | 11.17 | 5,000 PSI / 345 Bar |
| IPBU-08 | 1/2 | 10.41 | 15/16 | 7/8 | 22.86 | 21.84 | 47.49 | 31.75 | 71.12 | 41.91 | 19.44 | 12.70 | 5,000 PSI / 345 Bar |
| IPBU-10 | 5/8 | 12.70 | 1-1/16 | 1 | 24.38 | 21.84 | 50.80 | 32.51 | 72.64 | 42.67 | 22.62 | 12.70 | 5,000 PSI / 345 Bar |
| IPBU-12 | 3/4 | 15.74 | 1-3/16 | 1-1/8 | 24.38 | 21.84 | 52.32 | 37.33 | 78.99 | 47.49 | 25.79 | 16.76 | 5,000 PSI / 345 Bar |
| IPBU-14 | 7/8 | 18.28 | 1-3/8 | 1-1/4 | 25.90 | 21.84 | 58.67 | 42.92 | 84.58 | 53.08 | 28.97 | 19.05 | 5,000 PSI / 345 Bar |
| IPBU-16 | 1 | 22.35 | 1-5/8 | 1-1/2 | 31.24 | 26.41 | 64.26 | 45.21 | 95.75 | 57.40 | 33.73 | 19.05 | 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 Bulk head 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 Bulk head Union components are deployed across demanding industrial instrumentation, process lines, and pneumatic circuits, including:
Pass-through penetration for sample extraction tubing into climate-controlled analyzer houses.
Orderly routing of main pneumatic supply and pilot signal tubes through cabinet partition bulkheads.
Corrosion-resistant hydraulic pass-throughs across shipboard bulkheads and navigation enclosures.
Mounting high-pressure calibration circuits through front operator interface panels.
Routing chemical additive feeds through containment barriers without leakage risk.
Vibration-dampened bulkhead transitions for gas metering and pilot instrumentation lines.
Secure panel penetrations for lube oil pressure lines and cooling water circuits.
Moisture-proof penetration of refrigerant monitoring capillary and sensing tubes.
Pioneer Industries’ Brass Double Ferrule Bulk head 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 Bulk head Union.
A Brass Double Ferrule Bulkhead Union is a precision-engineered tube fitting designed to route instrumentation tubing through panel walls, machine partitions, or enclosure bulkheads. It features an elongated external threaded barrel with two heavy-duty hex jam nuts and lock washers to clamp firmly onto the partition, while providing twin-ferrule compression tube connections on both sides. It is specified whenever fluid or gas lines must penetrate panels without tube chaffing, vibration fatigue, or leakage.
Standard Pioneer Industries Brass Bulkhead Unions accommodate panel wall thicknesses ranging from 1.5 mm (1/16″) up to 12.7 mm (1/2″), depending on fitting size. For specialized applications requiring double-wall, insulated, or architectural partitions, extended-barrel bulkhead unions can be custom-machined upon engineering request.
The required clearance hole corresponds to the external barrel thread size. Common cutouts include 11.5 mm for 1/4″ (6mm) tube, 13.5 mm for 5/16″ (8mm) tube, 16.5 mm for 3/8″ (10mm) tube, and 19.5 mm for 1/2″ (12mm) tube. Tight clearance tolerances prevent radial play and maintain a stable seal against the panel face.
Pioneer Brass Bulkhead Unions are engineered to withstand pressures up to 5,000 PSI (345 Bar) for sizes 1/16″ to 1/4″ (2mm to 6mm) and up to 3,200 PSI (220 Bar) for 1/2″ (12mm) size, operating reliably across -200°C to +200°C (-328°F to +392°F) under ASME B31.3 guidelines.
Yes. Each side of the union features an independent twin-ferrule compression port. Tubing on either the cabinet exterior or interior can be loosened, serviced, or disconnected without disturbing the panel mounting or the opposite tube assembly.
The fitting body is precision-machined from extruded brass bar stock conforming to ASTM B16 Alloy C36000 and IS 319 Grade 1. Jam nuts are machined from high-tensile brass or forged CW617N brass, ensuring maximum thread shear strength during panel torquing.
Yes. They are 100% compatible with seamless copper tubes (ASTM B75 / B88) and brass tubes (ASTM B135). For flexible thermoplastic tubes (Nylon, PU, PTFE), Pioneer brass tube inserts must be installed inside the tube ends to prevent wall collapse.
Thread the primary jam nut onto the barrel, insert the fitting through the panel hole, thread the secondary jam nut from the opposite side, and tighten both jam nuts with calibrated open-end wrenches against the panel to standard torque values (15 to 45 Nm depending on size).
Yes. Every production batch of Pioneer Double Ferrule Bulkhead Unions is tested to verify leak integrity below 1 × 10⁻⁹ mbar·l/s, making them ideal for high-vacuum and analytical instrumentation enclosures.
All consignments from Pioneer Industries Mumbai include EN 10204 Type 3.1 Material Test Certificates, raw material chemical and mechanical test reports, hydrostatic proof certificates, and RoHS compliance certificates.
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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.
