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Double Ferrule Fittings

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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.

Features:
  • 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: RFS / KPL
  • Origin: Korea

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Tube Fittings Product Information

Twin ferrule Tube fittingsTwin Ferrule Tube Fittings
Specifications:
Tube Fittings are designed, to meet the specifications required by industrial applications. These fittings are normally supplied, for shipbuilding, pharmaceutical, chemical processing, power generation, and oil and gas applications. Twin Ferrule fittings are also known as Double Ferrule fittings or instrumentation fittings.

A 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 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.

Material:
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).
​

Size Range & Pressure Rating:
​Twin Ferrule fittings, are measured in metric (mm) and inches sizes ("OD). The metric sizes range from 2mm to 50mm, while inches 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. 

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 reach the ends of the fitting shoulder, and hand-tighten with the nut. Scribe the nut vertically at 6 o’clock position, and wrench tighten with 1 1/4 turns horizontally, while holding the body firmly with a second wrench.

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

Tube Fittings Temperature Rating

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
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:

Elastomer's Temperature Rating
  • ​NBR:  -25°C to 110°C (Default Option)
  • Viton: -28°C to 204°C
  • PTFE: -30°C to 315°C

IMPA Code: Stainless Steel Flareless Fittings

​Twin 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:

Stainless Steel Flareless Male Connector
Stainless Steel Flareless Male Connector
Stainless Steel Flareless Male Connectors:
IMPA CODE: 734301    6MM OD x 1/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734302    6MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734303    6MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734304    6MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734305    8MM OD x 1/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734306    8MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734307    8MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734308    8MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734309   10MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734310   10MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734311   10MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734312   12MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734313   12MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734314   12MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE)
For Catalogue Pages of Stainless Steel Flareless Male Connectors, please click here.
​

Stainless Steel Flareless Male Elbow
Stainless Steel Flareless Male Elbow
Stainless Steel Flareless Male Elbows:
IMPA CODE: 734321    6MM OD x 1/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734322    6MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734323    6MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734324    6MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734325    8MM OD x 1/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734326    8MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734327    8MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734328    8MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734329   10MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734330   10MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734331   10MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734332   12MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734333   12MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE)
IMPA CODE: 734334   12MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE)
For Catalogue Pages of Stainless Steel Flareless Male Elbows, please click here.
​
Stainless Steel Flareless Female Connector
Stainless Steel Flareless Female Connector
Stainless Steel Flareless Female Connectors
IMPA CODE: 734371    6MM OD x 1/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734372    6MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734373    6MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734374    6MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734375    8MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734376    8MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734377    8MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734378   10MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734379   10MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734380   10MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734381   12MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734382   12MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
IMPA CODE: 734383   12MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE)
For Catalogue Pages of Stainless Steel Flareless Female Connectors, please click here.
​

Stainless Steel Flareless Union
Stainless Steel Flareless Union
Stainless Steel Flareless Unions
IMPA CODE: 734401     6MM OD SS316 UNION COUPLING (TWIN FERRULE)
IMPA CODE: 734402     8MM OD SS316 UNION COUPLING (TWIN FERRULE)
IMPA CODE: 734403    10MM OD SS316 UNION COUPLING (TWIN FERRULE)
IMPA CODE: 734404    12MM OD SS316 UNION COUPLING (TWIN FERRULE)
For Catalogue Pages of Stainless Steel Flareless Unions, please click here.
​

Stainless Steel Flareless Reducing Unions
Stainless Steel Flareless Reducing Unions
Stainless Steel Flareless Reducing Unions
IMPA CODE: 734406     6MM OD x  8MM OD SS316 UNION COUPLING (TWIN FERRULE)
IMPA CODE: 734407     8MM OD x 10MM OD SS316 UNION COUPLING (TWIN FERRULE)
IMPA CODE: 734408    10MM OD x 12MM OD SS316 UNION COUPLING (TWIN FERRULE)
For Catalogue Pages of Stainless Steel Flareless Reducing Unions, please click here.
​
Stainless Steel Flareless Bulkhead Unions
Stainless Steel Flareless Bulkhead Unions
Stainless Steel Flareless Bulkhead Unions
IMPA CODE: 734411     6MM OD SS316 BULKHEAD UNION (TWIN FERRULE)
IMPA CODE: 734412     8MM OD SS316 BULKHEAD UNION (TWIN FERRULE)
IMPA CODE: 734413    10MM OD SS316 BULKHEAD UNION (TWIN FERRULE)
IMPA CODE: 734414    12MM OD SS316 BULKHEAD UNION (TWIN FERRULE)
For Catalogue Pages of Stainless Steel Flareless Bulkhead Unions, please click here.
​
Stainless Steel Flareless Tee Unions
Stainless Steel Flareless Tee Unions
Stainless Steel Flareless Tee Unions
IMPA CODE: 734416     6MM OD SS316 UNION TEE (TWIN FERRULE)
IMPA CODE: 734417     8MM OD SS316 UNION TEE (TWIN FERRULE)
IMPA CODE: 734418    10MM OD SS316 UNION TEE (TWIN FERRULE)
IMPA CODE: 734419    12MM OD SS316 UNION TEE (TWIN FERRULE)
For Catalogue Pages of Stainless Steel Flareless Tee Unions, please click here.
​
Stainless Steel Flareless Nut
Stainless Steel Flareless Nut
Stainless Steel Flareless Nut
IMPA CODE: 734431     6MM OD SS316 UNION NUT (TWIN FERRULE)
IMPA CODE: 734432     8MM OD SS316 UNION NUT (TWIN FERRULE)
IMPA CODE: 734433    10MM OD SS316 UNION NUT (TWIN FERRULE)
IMPA CODE: 734434    12MM OD SS316 UNION NUT (TWIN FERRULE)
For Catalogue Pages of Stainless Steel Flareless Nut, please click here.
​
Stainless Steel Front Ferrule
Stainless Steel Front Ferrule
Stainless Steel Front Ferrule
IMPA CODE: 734436     6MM OD SS316 FRONT FERRULE (TWIN FERRULE)
IMPA CODE: 734437     8MM OD SS316 FRONT FERRULE (TWIN FERRULE)
IMPA CODE: 734438    10MM OD SS316 FRONT FERRULE (TWIN FERRULE)
IMPA CODE: 734439    12MM OD SS316 FRONT FERRULE (TWIN  FERRULE)

For Catalogue Pages of Stainless Steel Ferrule Front & Rear, please click here.
​
Stainless Steel Back Ferrule
Stainless Steel Back Ferrule
Stainless Steel  Rear Ferrule
IMPA CODE: 734441     6MM OD SS316 BACK FERRULE (TWIN FERRULE)
IMPA CODE: 734442     8MM OD SS316 BACK FERRULE (TWIN FERRULE)
IMPA CODE: 734443    10MM OD SS316 BACK FERRULE (TWIN FERRULE)
IMPA CODE: 734444    12MM OD SS316 BACK FERRULE (TWIN FERRULE)
For Catalogue Pages of Stainless Steel Rear Ferrule, please click here.
​

Catalogue available in pdf
Twin Ferrule Fittings
Twin Ferrule Fittings

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