Cast Iron Flanges - ASME B16.1 Class 25 Dimensions

Expired

Dimensions of Class 25 FF Threaded Flanges as per ASME B16.1.

Metric Dimensions: All Dimensions are in mm unless noted otherwise in the table.

Cast Iron Flanges

Flanges Hub Bolt Holes Bolting
Nom
Pipe
Size		 Diameter
O		 Minimum
Thickness,
Q		 Minimum
Diameter
X		 Minimum
Length
Y		 Diameter
of Bolt
Circle		 Diameter
of Bolt Holes		 Number
of Bolts		 Diameter
of Bolts (Inches)		 Length
of Bolts
4 230 19.0 135 33 191 3/4 8 5/8 64
5 255 19.0 164 37 216 3/4 8 5/8 64
6 280 19.0 192 40 241 3/4 8 5/8 64
8 345 19.0 246 45 299 3/4 8 5/8 64
10 405 22.2 303 49 368 3/4 12 5/8 70
12 485 25.4 357 56 432 3/4 12 5/8 76
14 535 28.6 391 57 476 7/8 12 3/4 89
16 595 28.6 445 64 540 7/8 16 3/4 89
18 635 31.8 498 68 578 7/8 16 3/4 95
20 700 31.8 552 78 635 7/8 20 3/4 95
24 815 34.9 560 83 749 7/8 20 3/4 102
30 985 38.1 ... ... 914 1 28 7/8 114
36 1170 41.3 ... ... 1085 1 32 7/8 121
42 1345 44.5 ... ... 1257 1-1/8 36 1 133
48 1510 50.8 ... ... 1422 1-1/8 44 1 146
54 1685 57.2 ... ... 1594 1-1/8 44 1 159
60 1855 57.2 ... ... 1759 1-1/4 52 1-1/8 159
72 2195 63.5 ... ... 2095 1-1/4 60 1-1/8 172
84 2535 69.9 ... ... 2425 1-3/8 64 1-1/4 191
96 2875 76.2 ... ... 2756 1-3/8 68 1-1/4 203

Imperial Dimensions: All Dimensions are in inches.

Flanges Hub Bolt Holes Bolting
Nom
Pipe
Size		 Diameter
O		 Minimum
Thickness,
Q		 Minimum
Diameter
X		 Minimum
Length
Y		 Diameter
of Bolt
Circle		 Diameter
of Bolt Holes		 Number
of Bolts		 Diameter
of Bolts (Inches)		 Length
of Bolts
4 9.00 0.75 5.31 1.31 7.50 3/4 8 5/8 2.50
5 10.00 0.75 6.44 1.44 8.50 3/4 8 5/8 2.50
6 11.00 0.75 7.56 1.56 9.50 3/4 8 5/8 2.50
8 13.50 0.75 9.69 1.75 11.75 3/4 8 5/8 2.50
10 16.00 0.88 11.94 1.94 14.25 3/4 12 5/8 3.00
12 19.00 1.00 14.06 2.19 17.00 3/4 12 5/8 3.00
14 21.00 1.12 15.37 2.25 18.75 7/8 12 3/4 3.50
16 23.50 1.12 17.50 2.50 21.25 7/8 16 3/4 3.50
18 25.00 1.25 19.62 2.69 22.75 7/8 16 3/4 4.00
20 27.50 1.25 21.75 2.88 25.00 7/8 20 3/4 4.00
24 32.00 1.38 26.00 3.25 29.50 7/8 20 1/4 4.00
30 38.75 1.50 ... ... 36.00 1 28 7/8 4.50
36 46.00 1.62 ... ... 42.75 1 32 7/8 5.00
42 53.00 1.75 ... ... 49.50 1-1/8 36 1 5.50
48 59.50 2.00 ... ... 56.00 1-1/8 44 1 6.00
54 66.25 2.25 ... ... 62.75 1-1/8 44 1 6.50
60 73.00 2.25 ... ... 69.25 1-1/4 52 1-1/8 6.50
72 86.50 2.50 ... ... 82.50 1-1/4 60 1-1/8 7.00
84 99.75 2.75 ... ... 95.50 1-1/8 64 1-1/4 7.50
96 113.25 3.00 ... ... 108.50 1-1/8 68 1-1/4 8.00

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