ASME Flange Bolt Torque Values
Bolt Torque Values for ASME B16.47 Series A Class 150# Flat Flanges
with A193 Grade B7 Bolts
For Full Face Homogenous Elastomeric Gaskets
| <70 durometer Shore A | >70 durometer Shore A | ||||
| Nominal Pipe Size (in) | # of Bolt Holes (in) | Size of Bolts (in) | Minimum Torque (ft. lbs.) | Preferred Torque (ft. lbs.) | Preferred Torque (ft. lbs.) |
| 26 | 24 | 1.25 | 238 | 238 | 318 |
| 28 | 28 | 1.25 | 224 | 224 | 299 |
| 30 | 28 | 1.25 | 248 | 248 | 331 |
| 32 | 28 | 1.50 | 309 | 309 | 412 |
| 34 | 32 | 1.50 | 283 | 283 | 377 |
| 36 | 32 | 1.50 | 309 | 309 | 411 |
| 38 | 32 | 1.50 | 356 | 356 | 474 |
| 40 | 36 | 1.50 | 328 | 328 | 438 |
| 42 | 36 | 1.50 | 354 | 354 | 472 |
| 44 | 40 | 1.50 | 339 | 339 | 452 |
| 46 | 40 | 1.50 | 354 | 354 | 473 |
| 48 | 44 | 1.50 | 342 | 342 | 456 |
| 50 | 44 | 1.75 | 470 | 470 | 626 |
| 52 | 44 | 1.75 | 502 | 502 | 669 |
| 54 | 44 | 1.75 | 535 | 535 | 713 |
| 56 | 48 | 1.75 | 528 | 528 | 705 |
| 58 | 48 | 1.75 | 561 | 561 | 747 |
| 60 | 52 | 1.75 | 530 | 530 | 707 |
Bolt Torque Values for ASME B16.5 Series A Class 150# Flat Flanges
with A193 Grade B7 Bolts
For Full Face Homogenous Elastomeric Gaskets
| <70 durometer Shore A | >70 durometer Shore A | ||||
| Nominal Pipe Size (in) | # of Bolt Holes (in) | Size of Bolts (in) | Minimum Torque (ft. lbs.) | Preferred Torque (ft. lbs.) | Preferred Torque (ft. lbs.) |
| 0.50 | 4 | 0.50 | 9 | 14 | 19 |
| 0.75 | 4 | 0.50 | 12 | 17 | 23 |
| 1.00 | 4 | 0.50 | 14 | 21 | 28 |
| 1.25 | 4 | 0.50 | 16 | 24 | 32 |
| 1.50 | 4 | 0.50 | 19 | 28 | 37 |
| 2.00 | 4 | 0.63 | 33 | 49 | 66 |
| 2.50 | 4 | 0.63 | 45 | 67 | 90 |
| 3.00 | 4 | 0.63 | 49 | 73 | 97 |
| 3.50 | 8 | 0.63 | 30 | 45 | 60 |
| 4.00 | 8 | 0.63 | 33 | 49 | 66 |
| 5.00 | 8 | 0.75 | 41 | 61 | 82 |
| 6.00 | 8 | 0.75 | 46 | 69 | 92 |
| 8.00 | 8 | 0.75 | 66 | 99 | 132 |
| 10.0 | 12 | 0.88 | 64 | 96 | 128 |
| 12.0 | 12 | 0.88 | 93 | 140 | 186 |
| 14.0 | 12 | 1.00 | 134 | 201 | 268 |
| 16.0 | 16 | 1.00 | 120 | 181 | 241 |
| 18.0 | 16 | 1.13 | 132 | 198 | 264 |
| 20.0 | 20 | 1.13 | 124 | 187 | 249 |
| 24.0 | 20 | 1.25 | 173 | 260 | 347 |
NOTE 1: This torque table applies for 1/16” and 1/8” thick homogenous elastomeric gaskets. The pressure rating of the material may vary depending on the grade.
NOTE 2: The above-mentioned torque values are based on the maximum bolt stress of 60,000 psi. Bolt yield should be at least 80,000 psi.
NOTE 3: This table does not take flange strength into consideration. We recommend consulting the flange manufacturer to confirm the suitability of the above-mentioned values.
NOTE 4: Apply torque in increments. When the gasket extends past the O.D. of the flange by 1/4:” to 3/8”, stop tightening.
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