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TWIN / DOUBLE FERRULE FITTINGS

Description:
Tube fittings provides a metal to metal seal between tube and ferrules. These fittings are well known as double ferrule fittings or instrumentation fittings that has a generic design that has been used in industry since 1940s.
​
Instrumentation fittings are supplied in a wide range of applications such as shipbuilding, oil and gas, chemical, fuel, and power generation. The available materials for twin ferrule fittings are stainless steel and brass, with a working pressure for double ferrule fittings up to 670 Bar, depending on tube wall thickness and tube material.

Fittings available are also equivalent to Swagelok or Parker Alok fittings.​
Metric Size Range
  • 6 MM to 42 MM
Inch Size Range
  • 1/4"OD to 2"OD
Design Standard
  • Double Ferrule Design
Material
  • SS316
  • Brass
Working Pressure​
  • Up to 670 BAR
Brand:
Stauff
​RFS Hydraulics

Catalogue:
Twin / Double Ferrule Fittings
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Literature:
Twin / Double Ferrule Fittings

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​Product Information of Twin / Double Ferrule Fittings

1. Specifications:​

Tube Fittings are designed to meet the specifications required by industrial applications. Twin ferrule fittings are often referred to as double ferrule fittings or instrumentation fittings. There are two popular brands for twin or double ferrule fittings which are both from the United States, Swagelok and Parker A-lok. 

A twin or double ferrule fitting is made up of four components, which are fitting body, back ferrule, front ferrule, and nut. The two ferrule design provides outstanding leak-tight connections as it has better tube-gripping action and improved resistance to vibration. In a twin or double ferrule fitting design, the back ferrule moves the front ferrule forward to spring-load the fitting assembly and seal with the fitting body, and create the tubing seal. The back ferrule also swages the tube to provide the grip needed to keep the fitting and tubing in place.

All assembly and reassembly action is transferred axially through the tube, resulting in leak-proof sealing. As a result, the tube does not move radially during installation, and it is not strained. The mechanical integrity of the system is preserved. The twin or double ferrule fitting has close tolerance control in machining, surface smoothness, and hardness of each component.
Twin / Double Ferrule Tube fittings
Twin or Double Ferrule Tube Fittings

2. Material:​

Twin or double ferrule tube fittings are available in Stainless Steel, Steel and Brass Material. Additional processing had been carried out, to protect fittings from corrosion. The additional process is passivization (stainless steel), white zinc electroplating with chrome VI free (steel), and acid cleaning (brass).

3. Size Range & Pressure Rating:​

Twin or double ferrule fittings are measured in metric (mm) and inches sizes ("OD). The metric sizes range from 2mm to 50mm, while inch sizes range from 1 1/16"OD to 2"OD. The pressure rating is determined by the tubes’ wall thickness, with varying tube materials. For more information regarding the working pressure, please refer to HSME M Tube Fittings.

4. Purpose and Application:​

Twin or double ferrule fittings  are simple to install. Welding or threaded ends are not required for the connections. It shifts to cost-cutting, resulting in less reliance on manpower. They may be re-used several times while maintaining a cheap material cost. The following are some of the advantages of utilizing a twin or double ferrule fitting:
  • Exceptional ductility and tensile strength
  • Excellent corrosion and chemical resistance
  • High-pressure and high-temperature tolerance
  • Ability to resist severe weather and the environment

​Twin or double ferrule fittings are generally supplied in a wide range of sectors as following:
  • Shipbuilding
  • Chemical processing
  • Oil and gas applications
  • Power generation
  • Pharmaceutical
  • Semiconductors 
  • Vacuum Application

FERRULE FITTINGS (BODY)
FERRULE FITTINGS (BODY)
5. Fitting Assembly Instruction:​
​
Before inserting the tube into the fittings, make sure that the tube ends are well prepared, and then lightly deburr the inner and outer diameters. After that, insert the tube, until it reaches the ends of the fitting shoulder, and hand-tighten with the nut. Scribe the nut vertically at 6 o’clock position, and the wrench tighten with 1 1/4 turns horizontally, while holding the body firmly with a second wrench  to the 9 o’clock position.

6. Tube Fittings Pressure Ratings:​

Working Pressure of the fittings is rated to the working pressure of tubing as listed in the tubing tables. Pressure ratings are based on fully annealed seamless stainless steel tubing ASTM A269/A213 and TP 316/316L, 304/304L or equivalent. Tubes are to be free from scratches and suitable for bending and flaring with hardness 90 HRB or less.
​​
Allowable working pressures are calculated using S value of 20 000psi (1378 bar) for ASTM A269 tubing at -20 to 100°F (-28 to 37°C) as listed in ASME B31.3 Process Piping Code and ASME B31.1 Power Piping Code.
Table 1: Fractional Seamless Stainless Steel Tubing
Working pressure are shown in psi.
Tube OD
​(in)
WT(in)
0.028"
WT(in)
0.035
WT(in)
​0.049
WT(in)
​0.065
WT(in)
​0.083
WT(in)
​0.095
WT(in)
​0.109
WT(in)
​0.120
WT(in)
​0.134
WT(in)
​0.156
WT(in)
​0.188
1/8
8500
10900
 
 
 
 
 
 
 
 
 
3/16
5400
7000
10200
 
 
 
 
 
 
 
 
1/4
4000
5100
7500
10200
 
 
 
 
 
 
 
5/16
 
4000
5800
8000
 
 
 
 
 
 
 
3/8
 
3300
4800
6500
8600
 
 
 
 
 
 
1/2
 
2600
3700
5100
6700
 
 
 
 
 
 
5/8
 
 
2900
4000
5200
6000
 
 
 
 
 
3/4
 
 
2400
3300
4200
4900
5800
6400
 
 
 
1
 
 
 
2400
3100
3600
4200
4700
5300
6200
 
1 1/4
 
 
 
 
2400
2800
3300
3600
4100
4900
 
1 1/2
 
 
 
 
 
2300
2700
3000
3400
4000
4900
2
 
 
 
 
 
 
2000
2200
2500
2900
3600
​Table 2: Metric Seamless Stainless Steel Tubing
Working pressure are shown in bar.
Tube OD
​(mm)
WT(mm)
​1.0
WT(mm)
​1.5

WT(mm)
​2.0

WT(mm)
​2.5
WT(mm)
​3.0

WT(mm)
​3.5

WT(mm)
​4.0

WT(mm)
​4.5

WT(mm)
​5.0

6
420
670
 
 
 
 
 
 
 
8
310
490
 
 
 
 
 
 
 
10
240
380
 
 
 
 
 
 
 
12
200
310
430
 
 
 
 
 
 
14
180
280
390
 
 
 
 
 
 
15
170
260
360
 
 
 
 
 
 
16
 
240
330
 
 
 
 
 
 
18
 
210
290
370
 
 
 
 
 
20
 
190
260
330
 
 
 
 
 
22
 
170
230
300
 
 
 
 
 
25
 
 
200
260
320
 
 
 
 
28
 
 
180
230
280
330
 
 
 
30
 
 
170
210
260
310
 
 
 
32
 
 
160
200
240
290
330
 
 
38
 
 
 
170
200
240
280
310
 
42
 
 
 
 
180
210
250
280
 
50
 
 
 
 
150
180
200
230
260

7. Tube Fittings Temperature Ratings:​

Tube Fittings temperature ratings vary in accordance to the body material as per below:
Body Material Temperature Rating​
There are reductions in the nominal pressure (PN) caused by the temperature of the fluid medium or surroundings. Please refer to the table below:
38°C
93°C
149​°C
204°C
260​°C
316​°C
343​°C
371​°C
1
1
0.97
0.9
0.85
0.84
0.82
0.81
399°C
427°C
454​°C
482°C
​510​°C
538°C
566​°C
593°C
0.81
0.80
0.79
0.78
0.77
0.77
0.73
0.62
621°C
649°C
677°C
0.49
0.37
0.28
Elastomer's Temperature Rating​​
​
When combing seal material, the temperature rating of seal may become the limiting factor on the fitting's temperature rating. Kindly refer to the temperature rating below:
NBR
 -25°C to 110°C (Default Option)
Viton
​-28°C to 204°C
PTFE
-30°C to 315°C

8. IMPA Code: Stainless Steel Flareless Fittings

​Twin or Double Ferrule Fittings, which are also called flareless fittings can be found in the IMPA Marine Stores Guide, which is the world’s leading reference guide for maritime purchasing and supply. For details on the reference codes of flareless fittings, please kindly see below:
i. Stainless Steel Flareless Male Connectors
Stainless Steel Flareless Male Connector
IMPA Code
Details
734301
6MM OD x 1/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734302
6MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734303
6MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734304
 6MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734305
8MM OD x 1/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734306
8MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734307
8MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA Code
Details
734308
8MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734309
10MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734310
10MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734311
10MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734312
12MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734313
12MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
734314
12MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
​For Catalogue Pages of Stainless Steel Flareless Male Connectors, please click here.
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ii. Stainless Steel Flareless Male Elbows
Stainless Steel Flareless Male Elbow
IMPA Code
Details
734321
6MM OD x 1/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
734322
6MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE)
734323
6MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
734324
6MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE)
734325
8MM OD x 1/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
734326
8MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE)
734327
8MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
734328
8MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE)
734329
10MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE)
734330
10MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
734331
10MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE)
734332
12MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE)
734333
​12MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
734334
12MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE)
​For Catalogue Pages of Stainless Steel Flareless Male Elbows, please click here.
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iii. Stainless Steel Flareless Female Connectors
Stainless Steel Flareless Female Connector
IMPA Code
Details
734371
​6MM OD x 1/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734372
​6MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734373
6MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734374
6MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734375
8MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734376
8MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734377
8MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734378
​10MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734379
10MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734380
10MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734381
12MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734382
12MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
734383
12MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
​For Catalogue Pages of Stainless Steel Flareless Female Connectors, please click here.
iv. Stainless Steel Flareless Unions
Stainless Steel Flareless Union
IMPA Code
Details
734401
 6MM OD SS316 UNION COUPLING (TWIN FERRULE)
734402
​8MM OD SS316 UNION COUPLING (TWIN FERRULE)
734403
10MM OD SS316 UNION COUPLING (TWIN FERRULE)
734404
12MM OD SS316 UNION COUPLING (TWIN FERRULE)
​For Catalogue Pages of Stainless Steel Flareless Unions, please click here.
Vertical Divider
v. Stainless Steel Flareless Reducing Unions
Stainless Steel Flareless Reducing Unions
IMPA Code
Details
734406
6MM OD x  8MM OD SS316 UNION COUPLING (TWIN FERRULE)
734407
8MM OD x 10MM OD SS316 UNION COUPLING (TWIN FERRULE)
734408
10MM OD x 12MM OD SS316 UNION COUPLING (TWIN FERRULE)
For Catalogue Pages of Stainless Steel Flareless Reducing Unions, please click here.
vi. Stainless Steel Flareless Bulkhead Unions
Stainless Steel Flareless Bulkhead Unions
IMPA Code
Details
734411
6MM OD SS316 BULKHEAD UNION (TWIN FERRULE)
734412
8MM OD SS316 BULKHEAD UNION (TWIN FERRULE)
734413
10MM OD SS316 BULKHEAD UNION (TWIN FERRULE)
734414
12MM OD SS316 BULKHEAD UNION (TWIN FERRULE)
​For Catalogue Pages of Stainless Steel Flareless Bulkhead Unions, please click here.
Vertical Divider
vii. ​Stainless Steel Flareless Tee Unions
Stainless Steel Flareless Tee Unions
IMPA Code
​​Details
734416
6MM OD SS316 UNION TEE (TWIN FERRULE)
734417
 8MM OD SS316 UNION TEE (TWIN FERRULE)
734418
10MM OD SS316 UNION TEE (TWIN FERRULE)
734419
​12MM OD SS316 UNION TEE (TWIN FERRULE)
​For Catalogue Pages of Stainless Steel Flareless Tee Unions, please click here.
viii. Stainless Steel Flareless Nut
Stainless Steel Flareless Nut
IMPA Code
Details
734431
6MM OD SS316 UNION NUT (TWIN FERRULE)
734432
8MM OD SS316 UNION NUT (TWIN FERRULE)
734433
10MM OD SS316 UNION NUT (TWIN FERRULE)
734434
12MM OD SS316 UNION NUT (TWIN FERRULE)
​For Catalogue Pages of Stainless Steel Flareless Nut, please click here.
Vertical Divider
viiii. Stainless Steel Front Ferrule
Stainless Steel Front Ferrule
IMPA Code
Details
734436
6MM OD SS316 FRONT FERRULE (TWIN FERRULE)
734437
8MM OD SS316 FRONT FERRULE (TWIN FERRULE)
734438
10MM OD SS316 FRONT FERRULE (TWIN FERRULE)
734439
12MM OD SS316 FRONT FERRULE (TWIN  FERRULE
​For Catalogue Pages of Stainless Steel Ferrule Front & Rear, please click here.
x. Stainless Steel Rear Ferrule
Stainless Steel Back Ferrule
IMPA Code
Details
734441
6MM OD SS316 BACK FERRULE (TWIN FERRULE)
734442
​8MM OD SS316 BACK FERRULE (TWIN FERRULE)
734443
10MM OD SS316 BACK FERRULE (TWIN FERRULE)
734444
​12MM OD SS316 FRONT FERRULE (TWIN  FERRULE
​For Catalogue Pages of Stainless Steel Rear Ferrule, please click here.

Product Catalogue in pdf:
Twin Ferrule Fittings
​Twin / Double
​Ferrule Fittings
Product Literature in pdf:
Twin Ferrule Fittings
Twin / Double
Ferrule Fittings

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High Pressure Fittings

FAQ Of Twin / Double Ferrule Fittings

What is the outer diameter size range of ferrule fittings?
The outer diameter size range of compression fittings is from 6 mm to 42 mm.
What is the working pressure for ferrule fittings?
A ferrule fitting can withstand working pressure up to 670 bar.
 What are the benefits of a ferrule fitting?
It offer maximum strength and ductility, hold extreme temperatures, chemical resistant and high corrosion resistance
Which fields/ industries would apply ferrule fittings?
Ferrule fittings apply in various applications or systems such as
- Onshore oil and gas
- Shipbuilding
- Refinery
- Instrumentation
- Power generator
What are the components included in a complete set of SAE flange end ball valves?
A full collection of ferrule fittings is made up of four precision parts: the body, the nut, the front and back ferrules.
Is connection needed during fiitting assembly?
No. It does not require welding or threaded ends connection.
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