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The service pressures of the ABALOK® tube fittings are determined by the tube on which they are installed, since in the face of the unlimited increase in internal pressure, the tube will collapse before the connector fails.

Check, then, the admissible pressures of the tube used and NEVER exceed them.

ATTENTION: It must be taken into account that these pressures are exclusively for the OD both ends; NPT threaded connections have their own service values ​​and can therefore limit these maximum pressures, since for the whole, the maximum working pressure will be the lower of both.

Admissible working pressures (bar):

AISI 316 stainless steel tube, seamless,
annealed (per ASTM A-231 or equivalent)
Tube OD
size
(inches)
Tube wall thickness (in mm)
0,41 0,51 0,71 0,89 1,24 1,65 2,11 2,41 2,77
1/8″ 316 406 592 756
3/16″ 207 263 380 490 709
1/4″ 153 194 279 356 521 709
3/8″ 181 230 332 456 598
1/2″ 134 170 243 330 434 507
5/8″ 134 192 259 339 394
3/4″ 112 159 214 278 322
7/8 95 135 181 235 272 316
1″ 83 117 157 204 235 273

 

Size thread
(inches)
Threaded connections
Straight Tee or elbow
Female Male Female Male
1/8″ 503 848 393 669
1/4″ 503 683 372 538
3/8″ 379 621 345 517
1/2″ 338 614 317 510
3/4″ 255 572 283 476
1″ 296 407

All these allowable pressures are valid at room temperature. For higher temperatures, coefficients that reduce this function of the working conditions must be applied.

See ABALOK® Tube Fittings