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Class 400 Standard Connection Flanges

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

 Class 400 - 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 3    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 1/2 3 1/2 8 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 1/2 3 1/2 9 0.8 12 1.1 40 5.1 9
1 1/4 1.25 1.28 5.25 0.81 2.5 2.5 2.81 5.25 4 0.75 3.88 2.81 2.5 0.88  5/8 3 3/4 3 3/4 13 1 15 1.4 45 5.8 9
1 1/2 1.5 1.5 6.12 0.88 2.88 2.75 3.25 6.12 4 0.88 4.5 3.25 2.75 1  3/4 4 1/4 4 1/4 16 1.2 21 1.9 61 7.8 9
2 2 1.94 6.5 1 3.62 3.31 3.94 6.5 8 0.75 5 3.94 3.31 0.88  5/8 4 1/4 4 1/4 20 1.5 29 2.6 68 8.5 9
2 1/2 2.5 2.32 7.5 1.12 4.12 3.94 4.63 7.5 8 0.88 5.88 4.63 3.94 1  3/4 4 3/4 4 3/4 27 2.1 39 3.6 88 11 9
3 3 2.9 8.25 1.25 5 4.62 5.38 8.25 8 0.88 6.62 5.38 4.62 1  3/4 5    5    36 2.7 50 4.6 104 13 9
3 1/2 3.5 3.36 9 1.38 5.5 5.25 5.81 9 8 1 7.25 5.81 5.25 1.12  7/8 5 1/2 5 1/2 45 3.4 61 5.5 116 15 9
4 4 3.83 10 1.38 6.19 5.75 6.44 10 8 1 7.88 6.44 5.75 1.12  7/8 5 1/2 5 1/2 65 3.8 93 6.5 197 19 12
5 5 4.81 11 1.5 7.31 7 7.81 11 8 1 9.25 7.81 7 1.12  7/8 5 3/4 5 3/4 88 5.3 127 9.1 229 22 12
6 6 5.76 12.5 1.62 8.5 8.12 9.19 12.5 12 1 10.62 9.19 8.12 1.12  7/8 6 6    110 6.7 169 12 286 27 12
8 8 7.62 15 1.88 10.62 10.25 11.38 15 12 1.12 13 11.38 10.25 1.25 1    6 3/4 6 3/4 154 9.1 233 17 379 36 12
10 10 9.56 17.5 2.12 12.75 12.62 13.44 17.5 16 1.25 15.25 13.44 12.62 1.38 1 1/8 7 1/2 7 1/2 218 13 298 21 475 46 12
12 12 11.38 20.5 2.25 15 14.75 15.75 20.5 16 1.38 17.75 15.75 14.75 1.5 1 1/4 8    8    285 16 401 28 627 62 12
14 14 14 23 2.38 16.25 16.75 18.25 23 20 1.38 20.25 18.25 16.75 1.5 1 1/4 8 1/4 8 1/4 336 19 467 32 758 74 12
16 16 16 25.5 2.5 18.5 19 20.31 25.5 20 1.5 22.5 20.31 19 1.62 1 3/8 8 3/4 8 3/4 418 23 542 37 884 88 12
18 18 18 28 2.62 21 21 22.56 28 24 1.5 24.75 22.56 21 1.62 1 3/8  9 9    482 26 645 43 1033 102 12
20 20 20 30.5 2.75 23 23.12 24.63 30.5 24 1.62 27 24.63 23.12 1.75 1 1/2  9 1/2 9 3/4 568 30 759 50 1165 118 12
24 24 24 36 3 27.62 27.62 29.25 36 24 1.88 32 29.25 27.62 2 1 3/4 10 1/2 11    804 42 1040 67 1540 160 12
Dimensions are in inches. Weights are in pounds.

Class 400 Standard Connection Flange PDF (for printing).