Category
Double Ferrule Tube Fittings
Double-ferrule compression fittings in 316 stainless steel, sized from 1/16" to 2" tube.
55 SKUs1 brands
How a double-ferrule fitting seals
As the nut is made up, the back ferrule pushes the front ferrule into the body and grips the tube, while the front ferrule seals against the body and the tube. Make up to the turns the manufacturer specifies and use ferrules from the same system.
Materials
Bodies are forged or machined from 316 stainless bar to ASTM A479 / A276, as the manufacturer states on each listing.
Size range
705orderable sizes
55listings with a size table
Every size above is a part number you can quote from. Open any listing for its full table.
Delivery
Double Ferrule Tube Fittings across the Gulf
Ex-stock from Dubai, delivered within 3 working days in the UAE.
Gauges, transmitters and control items are small, light and calibration-dependent, which makes them the easiest thing here to send by courier and the most important to order against the right range. We ship from Dubai with calibration documentation where the item carries it, and quote against the range and connection you specify rather than the nearest catalogue equivalent.
Saudi ArabiaTypically 3 working days from dispatchOmanTypically 3 working days from dispatchQatarTypically 3 working days from dispatchBahrainTypically 3 working days from dispatchKuwaitTypically 3 working days from dispatch
Beyond the Gulf
- Western & Northern Europe
- the United Kingdom, Norway, the Netherlands
- North America & Caribbean
- the United States, Guatemala, Honduras
- South-East Asia
- Singapore, Timor-Leste, Malaysia
Category image · Instrumentation & ControlsIH-TF-COS
316 Stainless Double Ferrule O-Seal Male Connector, Tube × SAE Straight Thread (Vacuum)
Indus Hydraulicstube end (nut and ferrules) × SAE straight threaddouble ferrule (front and back)
Category image · Instrumentation & ControlsIH-TF-COP
316 Stainless Double Ferrule O-Seal Male Connector, Tube × NPT Male (Vacuum)
Indus Hydraulicsdouble ferrule (front and back)tube end (nut and ferrules) × NPT
IH-TF-CG
316 Stainless Double Ferrule Female Gauge Connector, Tube × BSPP Female
Indus HydraulicsFemale Gauge Connector, Tube × BSPP Femaletube end (nut and ferrules) × BSPP
IH-TF-C
316 Stainless Double Ferrule Cap
Indus Hydraulicstube end (nut and ferrules)double ferrule (front and back)
Category image · Instrumentation & ControlsIH-TF-BUW
316 Stainless Double Ferrule Welding Bulkhead Union
Indus HydraulicsWelding Bulkhead Union2 × tube end (nut and ferrules)
Category image · Instrumentation & ControlsIH-TF-AG
316 Stainless Double Ferrule Female Adapter, Tube Stub × BSPP Female
Indus HydraulicsFemale Adapter, Tube Stub × BSPP Femaledouble ferrule (front and back)
IH-TF-AB
316 Stainless Double Ferrule Bulkhead Reducer, Tube × Tube Stub
Indus Hydraulicsdouble ferrule (front and back)Bulkhead Reducer, Tube × Tube Stub
Questions we get asked
About this range
- 01Can I buy ferrules separately?
- Yes: front ferrules, back ferrules, ferrule sets and nuts are listed as their own parts.
- 02How many turns do I tighten a double-ferrule fitting from finger-tight?
- Follow the make-up instruction for the Indus fitting; for this design it is typically 1-1/4 turns past finger-tight for 1/4″ to 1″ tube and 3/4 turn for 1/16″ to 3/16″ tube. Insert the tube until it bottoms in the body, run the nut up finger-tight, mark the nut at the six o'clock position, then hold the body steady and turn the nut the specified amount. Counting turns from a mark is more reliable than tightening to a torque. Larger sizes may need a different procedure or a preset tool, so check the listing before making up tube above 1″.
- 03What is a gap inspection gauge used for on double-ferrule fittings?
- It checks that a fitting has been tightened enough on its first make-up. After pull-up, the gauge is offered into the gap between the nut and the body hex: if it will not enter, the fitting has been turned far enough; if it slips in, the fitting is under-tightened and needs more turn. It is a check for the initial make-up only. A fitting that has been disconnected and remade sits closer to the body, so the gauge does not apply to remakes.
- 04Can a double-ferrule fitting be taken apart and made up again?
- Yes. Once made up, the ferrules stay on the tube, so the joint can be disconnected and remade. To remake, put the tube and preswaged ferrules back into the body, run the nut up by hand to its previous position, then tighten slightly with a wrench until it is firm; do not repeat the full first make-up turns. Replace the nut and ferrules, and cut back the tube, if the ferrules or tube end are damaged or the joint will not seal.
- 05What is a positionable elbow or tee with an SAE straight thread?
- A fitting that can be turned to face any direction before it is locked, so the tube outlet lines up without forcing the tube. The male end has an SAE straight thread with a locknut, a backup washer and an O-ring. Screw it into the port until the washer meets the port face, back it off to the direction you need, up to one full turn, then hold the body and tighten the locknut. The O-ring, not the thread, makes the seal, so check that the port is an SAE straight-thread O-ring port before fitting it.
- 06What are the O-seal connectors marked vacuum for?
- They connect tube to a threaded port where a thread-sealed joint is not tight enough, such as vacuum and low-pressure gas lines. The male end carries an O-ring that seals against the port, so the joint does not depend on tape or sealant in the threads, which can leak or outgas under vacuum. Choose the O-ring material for the medium and temperature, and check the pressure rating on the listing, which may be lower than that of the standard male connector.