What is a Brass Double Ferrule Fitting and how does its twin-ferrule sealing mechanism operate?

A Brass Double Ferrule Fitting is an instrumentation-grade mechanical compression tube fitting engineered for leak-tight gas and liquid connections under high pressure, vibration, and vacuum. The assembly consists of four precision components: a brass body, a front ferrule, a back ferrule, and a coupling nut. When the nut is tightened 1-1/4 turns past finger-tight, it drives the back ferrule forward. The rear ferrule pushes against the front ferrule, driving it into the fitting body's 20° angled precision seat to form a primary burnished metal-to-metal fluid seal. Simultaneously, the back ferrule rolls inward, creating a collet-like radial mechanical bite onto the outer diameter of the tubing that locks it firmly in place without twisting the tube.

What are the primary advantages of twin-ferrule design over single-ferrule and standard compression fittings?

The double ferrule geometry decouples the sealing function from the tube retention function: the front ferrule provides the primary leak-tight pressure seal against the fitting body and tube OD, while the rear ferrule provides the mechanical gripping collet. This eliminates torque transmission into the tubing (preventing tube twist), minimizes stress concentration, accommodates subtle tubing variations, and provides far superior resistance to vibration fatigue and impulse pressure spikes compared to single-ferrule fittings.

Are Pioneer Industries Brass Double Ferrule Fittings intermixable and interchangeable with Swagelok®, Parker A-LOK®, and Gyrolok®?

Yes. Pioneer Industries manufactures Brass Double Ferrule Fittings to universal instrumentation twin-ferrule dimensional standards, ensuring 100% component interchangeability with leading global brands such as Swagelok®, Parker A-LOK®, and Gyrolok®. Our complete fitting assemblies and individual replacement components (nuts, front ferrules, rear ferrules) mate flawlessly with industry-standard tubing and bodies while meeting identical seal integrity and pressure ratings.

What tubing materials and hardness specifications are compatible with Brass Double Ferrule Fittings?

Brass Double Ferrule Fittings are designed primarily for soft and half-hard seamless copper tubing (ASTM B75 / ASTM B88 / ASTM B280) and seamless brass tubing (ASTM B135). In low-pressure pneumatic and fluid lines, they may also be used with annealed stainless steel tubing (Rockwell hardness HRB 80 or lower) and calibrated fluoropolymer (PTFE / FEP) tubing when equipped with internal brass tube inserts.

Brass Double Ferrule Fittings manufacturer, supplier, and exporter in India

01 — Overview

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At Pioneer Industries, we offer these Industrial Brass Double Ferrule Fittings having utmost functionality for your required applications. We are manufacturer, supplier of Brass Double Ferrule Fittings and India’s leading Brass Double Ferrule Fittings Exporters in Mumbai.

Global Supply

Pioneer Industries manufacturing and exporting high quality Brass Double Ferrule Fittings worldwide.

We are India’s one of the leading Brass Double Ferrule Fittings manufacturers and exporters to more than 85 countries to exporting and manufacturing on a large scale. All size supply maintains a massive inventory of Brass Double Ferrule Fittings, with all standard sizes and numerous styles available.

Brass Double Ferrule Fittings is manufactured from high-quality materials that are sourced from trusted and reliable vendors. Most of the Brass Double Ferrule Fittings are available in various material grades, and coatings/plating’s are available. We’ve got the right product for your needs.

02 — Product Detail

Brass Double Ferrule Fittings Supplier

Brass Double Ferrule Fittings are precision design to withstand high pressure, vibration, impact, vacuum and temperature changes. Brass Double Ferrule Fittings are compact and lightweight, no special tools required, and has low tightening torque whereas easy assembly compression design, easy to connect and disconnect and economical to reuse. They can be used with 304, 316, or 316 L Brass tubing.

Brass Double Ferrule Fittings have precisely contrived threads to ensure reliable and leak-free joints and Provides a leak tight seal for high pressure, vibration, and vacuum in gas or liquid applications. No tube twisting during fitting installation preserving mechanical integrity of tube or pipes. Unique design that allows the front ferrule to create a pressure seal on tube and body. Brass Double Ferrule Fittings has a 4:1 safety factor with respect to the working pressure capabilities of the tubing used.

We at Pioneer Industries manufacture a wide variety of Brass Double Ferrule Fittings and finds applications in different needs in numerous industries like Nuclear Energy Sector, Oil & Gas Industries, Chemical Industry, Petroleum Industries, Defence Industry, and Aerospace Industry. Brass Double Ferrule Fittings are available in numerous shapes, dimensions and grades. Pioneer Industries manufactures and exports high-quality industrial Brass Double Ferrule Fittings.

Features of Brass Double Ferrule Fittings:

Precision Twin-Ferrule Sealing: Front ferrule provides burnished primary metal-to-metal fluid seal; back ferrule provides axial mechanical collet bite.
Zero Torque Transmission: Tube does not twist or rotate during assembly, preserving internal tubing geometry and stress integrity.
High Vibration & Shock Dampening: Collet geometry absorbs external vibration and pressure pulses far better than single-ferrule fittings.
Conservative 4:1 Safety Factor: Built to withstand working pressures up to 5,000 PSI with 4:1 burst rating per ASME B31.3.
Full Vacuum Containment: Tested and certified for high-vacuum installations down to 1 × 10⁻⁹ torr with zero helium leak decay.
100% Intermixable & Interchangeable: Dimensionally interchangeable with Swagelok®, Parker A-LOK®, and Gyrolok® instrumentation fittings.
Repeated Remake Capability: Can be disassembled and reassembled repeatedly without replacing ferrules or degrading seal tightness.

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Specification

Sizes: 1/8″ to 1″ (3mm to 25mm) having various connecting thread profiles like NPT, BSPP & BSPT in Branch Connections, Straight Connections, Tee and Cross Connections in Male Thread Connections, Female Thread Connections, Male – Female Thread Connections, etc. Material of Construction: Brass ASTM B16 C36000 / CW614N, Forgings ASTM B283 C37700. Materials conforming to NACE MR 01-75 is available on specific requests.

+ + + + Brass Double Ferrule Fittings Supplier - Pioneer Industries

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Oil and gas –

These Brass Double Ferrule Fittings find application in processing equipment such as tanks, drilling rigs, and pumps, and used in the oil and gas industries giving stable performance in high stress and corrosive conditions.

Building and Construction –

Scaffolding and other support structures requires variety Brass Double Ferrule Fittings to safeguard and guarantee the stability of structure during construction.

Chemical refining –

In chemical refineries, Brass Double Ferrule Fittings are made using corrosion resistant high performance materials, such as Brass, tool alloys, and exotic metals and find use in machineries such as heat exchangers, chemical tanks, and processing systems.

Marine –

Brass Double Ferrule Fittings installed in the marine industry necessitate excellent corrosion resistance to withstand the extended periods of exposure to saltwater that marine ramps, marine decks, bulkheads, and tanks experience.

Automobile and transportation –

Brass Double Ferrule Fittings are used to assemble a wide range of vehicles, including commercial vehicles like trucks, passenger vehicles like cars, airplanes, and specialized automobile equipment.

Power generation –

Distinctive applications include use in exhaust systems, electrical equipment, motors and pumps, and storage containers. These Brass Double Ferrule Fittings for the power generation industry are made of corrosion resistant and high strength materials.

Agriculture –

In the agricultural industry, these Fittings are used in field irrigation and filtration systems, and other farming equipment, drying units, buildings, and grain bins.

Military –

Military Brass Double Ferrule Fittings are manufactured and functionally designed to withstand extreme temperatures, corrosive compounds, and high stress environments and find applications like include equipment motors, heat exchangers, and engines, and processing equipment.

06 — FAQs

Frequently Asked Questions – Brass Double Ferrule Fittings

Find answers to common questions about our instrumentation-grade Brass Double Ferrule Fittings, manufacturing standards, installation, pressure ratings, and technical specifications.

A Brass Double Ferrule Fitting is a four-piece mechanical compression tube fitting engineered for leak-tight gas and liquid connections under high pressure, severe vibration, and vacuum conditions. The assembly consists of a brass body, a front ferrule, a back ferrule, and a coupling nut. When the nut is tightened 1-1/4 turns past finger-tight, it advances axially against the back ferrule. The back ferrule drives the front ferrule forward into the fitting body's 20° angled seat, creating a primary burnished metal-to-metal fluid seal. At the same time, the back ferrule cams inward, biting radially into the tube outer diameter with a collet-like grip. This dual action mechanically isolates the front ferrule seal from mechanical stress and ensures zero torque is transmitted to the tubing.

The primary advantage of the double ferrule geometry is the mechanical decoupling of sealing and gripping functions: (1) Zero Torque Transmission: The back ferrule grips the tube while the nut slides over its rear shoulder, ensuring the tubing does not twist or rotate during assembly; (2) Vibration Dampening: The rear ferrule absorbs external piping vibrations and pressure pulsations, preventing stress fatigue at the primary seal; (3) Leak-Tight Reliability: Dual-contact sealing handles thermal shocks and impulse surges far better than single-ferrule or flared fittings; (4) Remake Repeatability: Connections can be disassembled and remade dozens of times without replacing ferrules or sacrificing pressure rating.

Our Brass Double Ferrule Fittings are engineered with a conservative 4:1 safety factor relative to the burst pressure of compatible brass and copper tubing per ASME B31.3 process piping standards. In fractional sizes from 1/8″ to 3/8″ OD, working pressures reach up to 3,000 to 5,000 PSI (206 to 345 Bar), while larger sizes (1/2″ to 1″ OD) operate comfortably between 1,500 and 3,000 PSI depending on tube wall thickness. They are also fully qualified for high-vacuum applications down to 1 x 10⁻⁹ torr with zero measurable helium leak rate.

Yes. Pioneer Industries manufactures Brass Double Ferrule Fittings to universal instrumentation twin-ferrule dimensional standards. Our complete fitting assemblies and individual replacement components (nuts, front ferrules, rear ferrules, and bodies) are 100% interchangeable and intermixable with Swagelok®, Parker A-LOK®, and Gyrolok® components, delivering identical sealing geometry, pressure containment, and remake performance.

Brass Double Ferrule Fittings deliver optimal performance when paired with tubing that is softer than the brass fitting material: (1) Seamless soft annealed or half-hard copper per ASTM B75, ASTM B88 (Type K / L), and ASTM B280; (2) Seamless red brass or yellow brass tubing per ASTM B135; (3) Fully annealed seamless SS 304/316 tubing (maximum Rockwell hardness HRB 80) for moderate pressure lines; (4) Calibrated PTFE, FEP, PFA, or Nylon tubing when fitted with internal brass tube support inserts.

Ensure the tube end is cut square, deburred inside and out, and inserted completely until it bottoms out against the fitting body shoulder. Tighten the nut finger-tight. For sizes 1/4″ (6mm) and above, mark the 6 o'clock position on the nut and body, then tighten 1-1/4 turns with an open-ended wrench until the mark reaches 9 o'clock. For sizes 1/8″ and 3/16″, tighten 3/4 turn. Use a Pioneer gap inspection gauge between the nut and body hex; if the gauge cannot enter the gap, the fitting is correctly swaged.

Before disassembly, depressurize the system completely. Loosen the nut with a wrench. The swaged front and back ferrules remain permanently retained on the tubing. To remake the connection, reinsert the tube assembly into the body until the front ferrule seats firmly, snug the nut by hand, and advance the nut slightly (approx. 1/4 to 1/6 of a turn past finger-tight) with a wrench until sharp mechanical resistance is felt. Double ferrule fittings can be reliably remade dozens of times without degrading leak integrity.

Our straight bodies, nuts, and ferrules are precision CNC-machined from premium high-grade free-cutting brass bar stock per ASTM B16 (Alloy C36000) or European equivalent EN 12164 CW614N (CuZn39Pb3). Shaped bodies such as elbows, tees, and crosses are hot-forged from ASTM B283 (Alloy C37700 / CW617N) for uniform grain structure and superior burst strength. Materials conforming to NACE MR0175 / ISO 15156 sour gas criteria or specialized dezincification-resistant (DZR) brass alloys are available on customer request.

Brass Double Ferrule Fittings are utilized across chromatography and analytical laboratories, pilot plants, pneumatic instrument control panels, HVAC-R refrigerant sampling lines, offshore marine utility panels, natural gas compressor skids, aerospace ground support equipment, and water purification instrumentation where stainless steel is either unnecessary or prone to galvanic incompatibility.

Every production lot undergoes rigorous inspection including optical coordinate measuring machine (CMM) dimensional checks, surface finish profiling on sealing cones, 100% helium mass spectrometer leak testing at vacuum, and hydrostatic burst proof pressure testing at 1.5x to 4x rated working pressure. Complete material test reports (MTRs) to EN 10204 Type 3.1 verifying chemical composition and mechanical properties are provided with every export shipment.

Brass Double Ferrule Fittings manufacturer, supplier, and exporter in India

Pioneer Industries manufacturing and exporting high quality Brass Double Ferrule Fittings worldwide.

Brass Double Ferrule Fittings Supplier

Features of Brass Double Ferrule Fittings:

Applications/Uses of Brass Double Ferrule Fittings

Oil and gas –

Building and Construction –

Chemical refining –

Marine –

Automobile and transportation –

Power generation –

Agriculture –

Military –

Applications Industries of Brass Double Ferrule Fittings

Types of Brass Double Ferrule Fittings offered by Pioneer Industries

Brass Double Ferrule Back Ferrule

Brass Double Ferrule Bulk head Union

Brass Double Ferrule Bulkhead Female Connector

Brass Double Ferrule Bulkhead Male Connector

Brass Double Ferrule Bulkhead Reducer

Brass Double Ferrule Elbow Union

Brass Double Ferrule Female Adapter

Brass Double Ferrule Female Branch Tee PFBT

Brass Double Ferrule Female Connector

Brass Double Ferrule Female Elbow

Brass Double Ferrule Female Run Tee

Brass Double Ferrule Front Ferrule

Brass Double Ferrule Male Adapter

Brass Double Ferrule Male Branch Tee

Brass Double Ferrule Male Connector

Brass Double Ferrule Male Elbow

Brass Double Ferrule Male Pipe Weld Connector

Brass Double Ferrule Male Run Tee

Brass Double Ferrule Nut

Brass Double Ferrule Reducer

Brass Double Ferrule Reducing Union

Brass Double Ferrule Tube Cap

Brass Double Ferrule Tube Plug

Brass Double Ferrule Union

Brass Double Ferrule Union Cross

Brass Double Ferrule Union Tee

Frequently Asked Questions – Brass Double Ferrule Fittings

Contact Pioneer Industries experts for detailed information