Tube Fitting

Single/Twin Ferrule Compression Tube Fittings (Os-Lok / Win-Lok) – General Information

Jain Steels Os-Lok/Win-Lok Tube fittings have been carefully designed and manufactured with continuous research and development backing to very stringent tolerances under rigid Quality Control procedures approved to ISO 9001-2000 quality management systems to provide zero leak, Torque free seal in instrumentation and process tubing.

Jain Steels Os-Lok/Win-Lok Tube fittings ensures maximum safety and reliability due to Tests carried out such as High pressure, impulse, vibration, vacuum, temperature, pull out and burst pressure.

t1
t2

TUBING SELECTIONS

Stainless steel 304 and 316 fully annealed seamless tubing according to standard ASTM A213 or ASTM A269 or equivalent, are suitable for use with  Os-Lok/Win-Lok tube fittings.

The tubing should be compatible with the process fluid, pressure and temperature.

For good performance of  Os-Lok/Win-Lok tube fittings, the tubing should be reasonably round, free from nicks, scratches, the surface finish should be good and tube ends are squarely cut and must be free from burrs.
The hardness of tubing as desired is 80Rb; the maximum allowed by ASTM is 90Rb.

TUBING DATA TABLES FOR FRACTIONAL SIZE :
ALLOWABLE WORKING PRESSURE (PSI)

Tubing O.D.

WALL THICKNESS IN INCH

0.028

0.035

0.049

0.065

0.083

0.095

0.109

0.120

1/8

8600

10900

3/16

5500

7000

10300

1/4

4000

5100

7500

10300

5/16

4100

5900

8100

3/8

3300

4800

6600

1/2

2600

3700

5100

6700

5/8

3000

4000

5200

6100

3/4

2400

3300

4300

5000

5800

7/8

2100

2800

3600

4200

4900

1

2400

3200

3700

4200

4700

TUBING DATA TABLES FOR METRIC SIZE :
ALLOWABLE WORKING PRESSURE IN BAR

Tubing O.D.

WALL THICKNESS IN MILLIMETER

0.5

0.6

0.7

0.8

1.0

1.2

1.5

1.6

1.8

2.0

2.2

2.5

3.0

3

497

607

718

828

1032

6

331

386

497

607

774

912

8

208

280

359

440

558

607

10

221

280

342

440

473

12

182

231

280

359

386

440

497

14

195

237

302

324

369

416

463

535

654

16

169

205

361

280

319

358

398

460

564

18

150

181

230

246

280

314

349

403

496

22

121

147

185

199

225

252

280

322

394

25

108

128

162

173

196

220

244

280

342

Note:
Working pressure (psig) for seamless tubing. Multiply pressure rating by 0.80 for single welded tubing. Multiply pressure rating by 0.85 for double welded tubing.

FACTORS USED TO DETERMINE ALLOWABLE PRESSURE AT HIGHER TEMPERATURES.

°F

°C

A.I.S.I. 316

200

93

1

400

204

0.96

600

316

0.85

800

427

0.79

1000

538

0.76

1200

649

0.37

For Example :
The allowable pressure for type SS316, Size 1/4″OD x 0.035 wall at 600°F(316°C) would be equivalent to 5100 psi x 0.85 = 4335 psi.

GAS SERVICE

Extra care must be taken while selecting tubing for gas application, In order to achieve a gas-tight seal, ferrules in instruments fittings must seal any minor surface imperfections.

The thick walled tubing helps the ferrules to overcome minor surface imperfections

Jain Steels Corporation recommends the following minimum wall thickness of tubing for gas application

GAS APPLICATION TUBING

GAS APPLICATION TUBING

Tube OD
(Inches)

Nominal Minimum Wall Thickness
(Inches)

1/8″

0.028″

3/16″

0.028″

1/4″

0.028″

5/16″

0.035″

3/8″

0.035″

1/2″

0.049″

5/8″

0.065″

3/4″

0.065″

7/8″

0.083″

1″

0.083″

Tube OD
(Metric)

Nominal Minimum Wall Thickness
(Metric)

3 mm

0.8 mm

6 mm

0.8 mm

8 mm

1.0 mm

10 mm

1.0 mm

12 mm

1.0 mm

14 mm

1.2 mm

16 mm

1.5 mm

18 mm

1.5 mm

20 mm

1.8 mm

22 mm

2.0 mm

25 mm

2.2 mm

PIPE END NPT AND ISO PRESSURE RATINGS

Fitting that has both tube and pipe thread ends can have different pressure ratings. The pipe end pressure ratings chart given below for SS316 shows the pressure ratings for male and female pipe thread ends.

Working pressure is calculated on ANSI code for pressure piping B31.3 basis.

NPT/BSPT
PIPE SIZE

WORKING PRESSURE IN PSIG

MALE THREAD

FEMALE THREAD

Straight Fittings

Shape Fitting

Straight Fittings

Shape Fitting

1/8″

9100

9100

6400

5500

¼”

7500

7500

6600

5600

3/8″

7200

7200

5300

5000

½”

6600

5800

5200

4500

¾”

6400

6400

4300

3500

1″

4600

4600

4500

3900

SAE/MS PRESSURE RATINGS FOR SS316

Pressure ratings are from SAE J1926/3

SAE/MS THREAD SIZE

Non Positionable

Positionable

PSIG

PSIG

5/16-24

4568

4568

7/16-20

4568

4568

1/2-20

4568

4568

9/16-18

4568

3626

3/4-16

4568

3626

7/8-14

3626

2900

1.1/16-12

3626

2900

1.3/16-12

2900

2320

1.5/16-12

2900

2320