Rated Internal Working Pressure for Copper Tube: Type M*

Nominal or standard size, in inches Annealed*** Drawn**
S= 6000 psi 100F S= 5100 psi 150F S= 4900 psi 200F S= 4800 psi 250F S= 4700 psi 300F S= 4000 psi 350F S= 3000 psi 400F S= 10,300 psi 100F S= 10,300 psi 150F S= 10,300 psi 200F S= 10,300 psi 250F S= 10,000 psi 300F S= 9,700 psi 350F S= 9,400 psi 400F
¼ — — — — — — — — — — — — — —
3/8 570 485 466 456 447 380 285 982 982 982 982 953 925 896
½ 494 420 403 395 387 329 247 850 850 850 850 825 800 776
5/8 — — — — — — — — — — — — — —
¾ 407 346 332 326 319 271 204 701 701 701 701 680 660 639
1 337 286 275 270 264 225 169 580 580 580 580 563 546 529
1¼ 338 287 276 271 265 225 169 582 582 582 582 565 548 531
1½ 331 282 270 265 259 221 166 569 569 569 569 553 536 520
2 299 254 244 239 234 199 149 514 514 514 514 499 484 469
2½ 274 233 224 219 215 183 137 471 471 471 471 457 444 430
3 253 215 207 203 199 169 127 435 435 435 435 423 410 397
3½ 252 214 206 202 197 168 126 433 433 433 433 421 408 395
4 251 213 205 201 197 167 126 431 431 431 431 419 406 394
5 233 198 190 186 182 155 116 400 400 400 400 388 377 365
6 218 186 178 175 171 146 109 375 375 375 375 364 353 342
8 229 195 187 183 180 153 115 394 394 394 394 382 371 359
10 230 195 188 184 180 153 115 394 394 394 394 383 371 360
12 230 195 188 184 180 153 115 395 395 395 395 383 372 360
* Based on maximum allowable stress in tension (psi) for the indicated temperatures (F).
** When brazing or welding is used to join drawn tube, the corresponding annealed rating must be used.
*** Types M and DWV are not normally available in the annealed temper. Shaded values are provided for guidance when drawn temper tube is brazed or welded. For more information, see Pressure Ratings and Burst Strength.