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Class 300 Standard Connection Flanges

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Long Weld Neck "LWN" Heavy Barrel "HB"  Equal Barrel "E"
   

 Class 300 - Standard Connection Specifications

Size     Flange     Barrel OD     Bolting     Nut     Stud Bolt     Weights           Length
Nom Bore LWN & E Bore HB OD Thk RF of OD LWN HB E # ofHoles Hole Size Bolt Circle Stop Dia Relief Dia Relief Length Size RF Length RTJ Length LWN   HB   E   Base
  B T D D D     C NS NR NL       Base Per  1" Base Per  1" Base Per  1"
 1/2 0.5 0.55 3.75 0.56 1.38 1.5 1.75 3.75 4 0.62 2.62 1.75 1.5 0.75 1/2  2 1/2 3    5 0.4 7 0.6 24 3.1 9
 3/4 0.75 0.74 4.62 0.62 1.69 1.88 2.19 4.62 4 0.75 3.25 2.19 1.88 0.88 5/8  3    3 1/2 9 0.7 11 0.9 37 4.6 9
1 1 0.96 4.88 0.69 2 2.12 2.44 4.88 4 0.75 3.5 2.44 2.12 0.88 5/8  3 1/4 3 1/2 9 0.8 12 1.1 40 5.1 9
1 1/4 1.25 1.28 5.25 0.75 2.5 2.5 2.81 5.25 4 0.75 3.88 2.81 2.5 0.88 5/8  3 1/4 3 3/4 13 1 15 1.4 45 5.8 9
1 1/2 1.5 1.5 6.12 0.81 2.88 2.75 3.25 6.12 4 0.88 4.5 3.25 2.75 1 3/4  3 1/2 4    15 1.2 21 1.9 61 7.8 9
2 2 1.94 6.5 0.88 3.62 3.31 3.94 6.5 8 0.75 5 3.94 3.31 0.88 5/8  3 1/2 4 1/4 20 1.5 28 2.6 68 8.5 9
2 1/2 2.5 2.32 7.5 1 4.12 3.94 4.62 7.5 8 0.88 5.88 4.62 3.94 1 3/4  4    4 1/2 25 2.1 38 3.6 89 11 9
3 3 2.9 8.25 1.12 5 4.62 5.38 8.25 8 0.88 6.62 5.38 4.62 1 3/4  4 1/4 5    35 2.7 49 4.6 106 13 9
3 1/2 3.5 3.36 9 1.19 5.5 5.25 6 9 8 0.88 7.25 6 5.25 1 3/4  4 1/4 5    42 3.4 59 5.5 122 15 9
4 4 3.83 10 1.25 6.19 5.75 6.62 10 8 0.88 7.88 6.62 5.75 1 3/4  4 1/2 5 1/4 62 3.8 91 6.5 207 19 12
5 5 4.81 11 1.38 7.31 7 8 11 8 0.88 9.25 8 7 1 3/4  4 3/4 5 1/4 84 5.3 124 9.1 241 21 12
6 6 5.76 12.5 1.44 8.5 8.12 9.38 12.5 12 0.88 10.62 9.38 8.12 1 3/4  4 3/4 5 3/4 105 6.7 165 12 303 27 12
8 8 7.62 15 1.62 10.62 10.25 11.56 15 12 1 13 11.56 10.25 1.12 7/8  5 1/2 6 1/4 148 9.1 228 17 405 36 12
10 10 9.56 17.5 1.88 12.75 12.62 13.62 17.5 16 1.12 15.25 13.62 12.62 1.25 1 6 1/4 7 1/4 210 13 291 21 499 46 12
12 12 11.38 20.5 2 15 14.75 15.94  20.5 16 1.25 17.75 15.94 14.75 1.38 1 1/8  6 3/4 7 1/2 275 16 392 28 651 61 12
14 14 14 23 2.12 16.25 16.75 18.44 23 20 1.25 20.25 18.44 16.75 1.38 1 1/8  7    7 3/4 324 19 456 32 785 74 12
16 16 16 25.5 2.25 18.5 19 20.5 25.5 20 1.38 22.5 20.5 19 1.5 1 1/4  7 1/2 8 1/2 404 23 529 37 914 88 12
18 18 18 28 2.38 21 21 22.75 28 24 1.38 24.75 22.75 21 1.5 1 1/4  7 3/4 8 1/4 465 26 630 43 1066 102 12
20 20 20 30.5 2.5 23 23.12 25 30.5 24 1.38 27 25 23.12 1.5 1 1/4  8 1/4 9 1/4 549 30 741 50 1228 118 12
24 24 24 36 2.75 27.25 27.62 29.62 36 24 1.62 32 29.62 27.62 1.75 1 1/2  9 1/4 10 1/4 778 42 1016 67 1627 160 12
Dimensions are in inches. Weights are in pounds.

Class 300 Standard Connection Flange PDF (for printing).