ASME B16.20 Style BX Gasket
1. Drawing of Style BX Gasket
Drawing of Style BX Gasket
2. Dimensions of Style BX Gasket
| Ring Number | Nominal Size | Outside Diameter of Ring, OD | Height of Ring, H | Width of Ring, A | Outside Diameter of Flat, ODT | Width of Flat, C | Hole Size, D [Note(1)] |
| BX-150 | 43 | 72.19 | 9.30 | 9.30 | 70.87 | 7.98 | 1.5 |
| BX-151 | 46 | 76.40 | 9.63 | 9.63 | 75.03 | 8.26 | 1.5 |
| BX-152 | 52 | 84.68 | 10.24 | 10.24 | 83.24 | 8.79 | 1.5 |
| BX-153 | 65 | 100.94 | 11.38 | 11.38 | 99.31 | 9.78 | 1.5 |
| BX-154 | 78 | 116.84 | 12.40 | 12.40 | 115.09 | 10.64 | 1.5 |
| BX-155 | 103 | 147.96 | 14.22 | 14.22 | 145.95 | 12.22 | 1.5 |
| BX-156 | 179 | 237.92 | 18.62 | 18.62 | 235.28 | 15.98 | 3.0 |
| BX-157 | 229 | 294.46 | 20.98 | 20.98 | 291.49 | 18.01 | 3.0 |
| BX-158 | 279 | 352.04 | 23.14 | 23.14 | 348.77 | 19.86 | 3.0 |
| BX-159 | 346 | 426.72 | 25.70 | 25.70 | 423.09 | 22.07 | 3.0 |
| BX-160 | 346 | 402.59 | 23.83 | 13.74 | 399.21 | 10.36 | 3.0 |
| BX-161 | 422 | 491.41 | 28.07 | 16.21 | 487.45 | 12.24 | 3.0 |
| BX-162 | 422 | 475.49 | 14.22 | 14.22 | 473.48 | 12.22 | 1.5 |
| BX-163 | 476 | 556.16 | 30.10 | 17.37 | 551.89 | 13.11 | 3.0 |
| BX-164 | 476 | 570.56 | 30.10 | 24.59 | 566.29 | 20.32 | 3.0 |
| BX-165 | 540 | 624.71 | 32.03 | 18.49 | 620.19 | 13.97 | 3.0 |
| BX-166 | 540 | 640.03 | 32.03 | 26.14 | 635.51 | 21.62 | 3.0 |
| BX-167 | 680 | 759.36 | 35.86 | 13.11 | 754.28 | 8.03 | 1.5 |
| BX-168 | 680 | 765.25 | 65.86 | 16.05 | 760.17 | 10.97 | 1.5 |
| BX-169 | 130 | 173.51 | 15.85 | 12.93 | 171.27 | 10.69 | 1.5 |
| BX-170 | 168 | 218.03 | 14.22 | 14.22 | 216.03 | 12.22 | 1.5 |
| BX-171 | 218 | 267.44 | 14.22 | 14.22 | 265.43 | 12.22 | 1.5 |
| BX-172 | 283 | 333.07 | 14.22 | 14.22 | 331.06 | 12.22 | 1.5 |
| BX-303 | 762 | 852.75 | 37.95 | 16.97 | 847.37 | 11.61 | 1.5 |
GENERAL NOTES:
(a) All dimensions are in millimeters.
(b) Radius, R, shall be 8% to 12% of the gasket height, H.
(c) Tolerances:
A = width of ring, +0.20, −0.00
Variation in width throughout the entire circumference of any ring shall not exceed 0.10 within these tolerances.
C = width of flat, +0.15, −0.00
D = hole size, ±0.5
H = height of ring, +0.20, −0.00
Variation in height throughout the entire circumference of any ring shall not exceed 0.10 within these tolerances.
OD = outside diameter of ring, +0.00, −0.15
ODT = outside diameter of flat, ±0.05
R = radius of ring [see General Note (b)]
23 deg p angle, ±0 deg 15 min.
NOTE:
(1) One pressure passage hole is required per gasket as illustrated. The centerline of the hole shall be located at the midpoint of
dimension C.
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