Precision-machined with internal silver plating to prevent thread galling, Pioneer Industries Brass Double Ferrule Nuts exert axial driving force on the front and back ferrules for a dependable, helium-leak-tight tube grip up to 5,000 PSI.
The Brass Double Ferrule Nut is the mechanical driving component of twin-ferrule compression systems. When tightened onto the fitting body, its precision internal chamfer engages the back ferrule, translating rotational torque into purely axial thrust that swages both ferrules onto the tubing wall.
Pioneer Brass Nuts feature factory-applied silver plating on internal threads, which functions as an integral solid lubricant. This eliminates thread galling, reduces required tightening torque by up to 35%, and guarantees smooth, repeatable make-and-break cycles throughout the life of the assembly.
Manufactured by Pioneer Industries Mumbai, these replacement and OEM nuts are trusted by instrument engineers, skid manufacturers, and gas handling specialists 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 free-cutting brass bar stock per ASTM B16 Alloy C36000 or forged brass ASTM B283, each nut undergoes strict thread gauging and optical inspection.
The precision internal drive angle is engineered to apply uniform radial pressure on the back ferrule without inducing rotational twist into the tubing.
Available for metric tubing 3 mm to 25 mm OD (MN Series) and fractional tubing 1/8" to 1" OD (IN 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 | L | Working Pressure |
|---|---|---|---|---|
| MPN-03 | 3 | 12 | 11.9 | 5,000 PSI / 345 Bar |
| MPN-04 | 4 | 12 | 11.9 | 5,000 PSI / 345 Bar |
| MPN-06 | 6 | 14 | 12.7 | 5,000 PSI / 345 Bar |
| MPN-08 | 8 | 16 | 13.5 | 5,000 PSI / 345 Bar |
| MPN-10 | 10 | 19 | 15.1 | 5,000 PSI / 345 Bar |
| MPN-12 | 12 | 22 | 17.4 | 5,000 PSI / 345 Bar |
| MPN-15 | 15 | 25 | 17.4 | 5,000 PSI / 345 Bar |
| MPN-16 | 16 | 25 | 17.4 | 5,000 PSI / 345 Bar |
| MPN-18 | 18 | 30 | 17.4 | 5,000 PSI / 345 Bar |
| MPN-20 | 20 | 32 | 17.4 | 5,000 PSI / 345 Bar |
| MPN-22 | 22 | 32 | 17.4 | 5,000 PSI / 345 Bar |
| MPN-25 | 25 | 38 | 20.6 | 5,000 PSI / 345 Bar |
| Part No. | Tube O.D. T in | H in | L | Working Pressure |
|---|---|---|---|---|
| IPN-01 | 1/16 | 5/16 | 7.93 | 5,000 PSI / 345 Bar |
| IPN-02 | 1/8 | 7/16 | 11.93 | 5,000 PSI / 345 Bar |
| IPN-03 | 3/16 | 1/2 | 11.93 | 5,000 PSI / 345 Bar |
| IPN-04 | 1/4 | 9/16 | 12.70 | 5,000 PSI / 345 Bar |
| IPN-05 | 5/16 | 5/8 | 13.46 | 5,000 PSI / 345 Bar |
| IPN-06 | 3/8 | 11/16 | 14.22 | 5,000 PSI / 345 Bar |
| IPN-08 | 1/2 | 7/8 | 17.52 | 5,000 PSI / 345 Bar |
| IPN-10 | 5/8 | 1 | 17.52 | 5,000 PSI / 345 Bar |
| IPN-12 | 3/4 | 1-1/8 | 17.52 | 5,000 PSI / 345 Bar |
| IPN-14 | 7/8 | 1-1/4 | 17.52 | 5,000 PSI / 345 Bar |
| IPN-16 | 1 | 1-1/2 | 20.57 | 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 Nut 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 Nut components are deployed across demanding industrial instrumentation, process lines, and pneumatic circuits, including:
Replacing worn or stripped nuts during turnaround and scheduled maintenance shutdowns.
Supplied to valve, manifold, and regulator manufacturers for factory-installed tube ports.
High-frequency disconnect points on gas chromatographs and analytical instruments.
Secure, low-torque fastening in congested panel interiors where wrench access is tight.
Resisting loosening under continuous mechanical vibration on rotary screw compressors.
Smooth, clean fastening on brass gas regulation manifolds and flowmeters.
Corrosion-resistant brass nuts providing long-lasting clamping force on deck instrumentation.
Daily disconnect points requiring reliable thread galling resistance over hundreds of cycles.
Pioneer Industries’ Brass Double Ferrule Nut 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 Nut.
The nut exerts axial force upon the back ferrule as it is threaded onto the fitting body, converting rotational wrench torque into forward swaging movement that locks the ferrules onto the tube.
Silver plating acts as a dry solid lubricant, preventing metal-to-metal galling under high contact pressures, reducing make-up torque by 35%, and extending reusable service life.
Tighten finger-tight, then rotate the nut 1-1/4 turns with a wrench for tubing sizes 1/4″ and above (or 6mm and above). For smaller sizes (1/8″ and 3/16″ or 3mm and 4mm), tighten 3/4 turn.
Yes. Pioneer silver-plated brass nuts are designed for repeated remakes (typically 20+ cycles). On remake, tighten finger-snug and advance approx. 1/12 to 1/6 turn.
Pioneer double ferrule nuts are manufactured to international industry standard geometry and are fully interchangeable and intermixable with major twin-ferrule brands.
Manufactured from high-grade extruded brass conforming to ASTM B16 Alloy C36000 / CW614N.
No. The patented double-ferrule geometry ensures that all rotational torque is absorbed at the nut-ferrule interface, transmitting purely axial thrust into the tubing.
Metric sizes MN-3 to MN-25 (3mm to 25mm OD) and fractional sizes IN-2 to IN-16 (1/8″ to 1″ OD).
The nut holds full assembly working pressures up to 5,000 PSI (345 Bar), matching the rating of the fitting body and tubing.
Supplied with EN 10204 Type 3.1 Material Test Certificates, plating thickness reports, and dimensional conformance data.
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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.
