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Class 2500 Standard Connections Flanges

Long Weld Neck "LWN"

Heavy Barrel "HB"

Equal Barrel "E"

(Click any image above to enlarge it and lock it in place, then scroll to the bottom table for dimensions)
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 5.25 1.19 1.38 1.81 2.25 5.25 4 0.88 3.5 2.25 1.81 1 3/4  4 3/4 4 3/4 11 0.7 14 1.1 45 6.1 9
 3/4 0.75 0.74 5.5 1.25 1.69 2.06 2.5 5.5 4 0.88 3.75 2.5 2.06 1 3/4  5    5    13 0.8 17 1.3 49 6.6 9
1 1 0.96 6.25 1.38 2 2.25 2.81 6.25 4 1 4.25 2.81 2.25 1.12 7/8  5 1/2 5 1/2 18 0.9 22 1.6 62 8.5 9
1 1/4 1.25 1.28 7.25 1.5 2.5 2.88 3.5 7.25 4 1.12 5.12 3.5 2.88 1.25 1 6    6    27 1.5 32 2.4 84 11 9
1 1/2 1.5 1.5 8 1.75 2.88 3.12 3.94 8 4 1.25 5.75 3.94 3.12 1.38 1 1/8  6 3/4 6 3/4 33 1.7 42 3 94 14 9
2 2 1.94 9.25 2 3.62 3.75 5.12 9.25 8 1.12 6.75 5.12 3.75 1.25 1 7    7    48 2.2 66 5 131 18 9
2 1/2 2.5 2.32 10.5 2.25 4.12 4.5 5.94 10.5 8 1.25 7.75 5.94 4.5 1.38 1 1/8  7 3/4 8    66 3.1 90 6.7 165 23 9
3 3 2.9 12 2.62 5 5.25 7 12 8 1.38 9 7 5.25 1.5 1 1/4  8 3/4 9    97 4.1 127 9 210 30 9
4 4 3.83 14 3 6.19 6.5 8.38 14 8 1.62 10.75 8.38 6.5 1.75 1 1/2  10    10 1/4 159 5.8 218 12 391 40 12
5 5 4.81 16.5 3.62 7.31 8 10 16.5 8 1.88 12.75 10 8 2 1 3/4  11 3/4 12 1/4 248 8.7 319 17 518 55 12
6 6 5.76 19 4.25 8.5 9.25 11.38 19 8 2.12 14.5 11.38 9.25 2.25 2 13 1/2 14    358 11 441 21 641 73 12
8 8 7.62 21.75 5 10.62 12 14.12 21.75 12 2.12 17.25 14.12 12 2.25 2 15    15 1/2 589 18 743 31 1167 92 16
10 10 9.56 26.5 6.5 12.75 14.75 17.38 26.50 12 2.62 21.25 17.38 14.75 2.75 2 1/2  19 1/4 20    997 26 1202 47 1625 134 16
12 12 11.38 30 7.25 15 17.38 20.12 30 12 2.88 24.38 20.12 17.38 3 2 3/4  21 1/4 22    1363 35 1609 61 1995 168 16

Dimensions are in inches. Weights are in pounds.
Class 2500 Standard Connection Flange PDF (for printing).