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  • All dimensions are in inches.
  • These flanges will be furnished with a flat face unless otherwise specified.

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Industry Standard Class 125 Slip-On Flange
Unit of Measure
1 

Item #

Nominal Pipe Size

Outside Diameter (O)

Thickness (T)

Overall Thickness (Y)

Hub Diameter (X)

Inside Diameter (B)

Approximate Weight

Number of Bolt Holes

Diameter of Bolt Holes

Diameter of Bolt Circle (C)

26125SOIS N/A 26 N/A 34.25 in N/A 2.00 in N/A 3.38 in N/A 28.50 in N/A 26.25 in N/A 235 lb N/A 24 N/A 1.38 in N/A 31.75 in
28125SOIS N/A 28 N/A 36.50 in N/A 2.06 in N/A 3.44 in N/A 30.75 in N/A 28.25 in N/A 270 lb N/A 28 N/A 1.38 in N/A 34.00 in
30125SOIS N/A 30 N/A 38.75 in N/A 2.13 in N/A 3.50 in N/A 32.75 in N/A 30.25 in N/A 305 lb N/A 28 N/A 1.38 in N/A 36.00 in
32125SOIS N/A 32 N/A 41.75 in N/A 2.25 in N/A 3.63 in N/A 35.00 in N/A 32.25 in N/A 375 lb N/A 28 N/A 1.63 in N/A 38.50 in
34125SOIS N/A 34 N/A 43.75 in N/A 2.31 in N/A 3.69 in N/A 37.00 in N/A 34.25 in N/A 400 lb N/A 32 N/A 1.63 in N/A 40.50 in
36125SOIS N/A 36 N/A 46.00 in N/A 2.38 in N/A 3.75 in N/A 39.25 in N/A 36.25 in N/A 450 lb N/A 32 N/A 1.63 in N/A 42.75 in
38125SOIS N/A 38 N/A 48.75 in N/A 2.38 in N/A 3.75 in N/A 41.75 in N/A 38.25 in N/A 530 lb N/A 32 N/A 1.63 in N/A 45.25 in
40125SOIS N/A 40 N/A 50.75 in N/A 2.50 in N/A 3.88 in N/A 43.75 in N/A 40.25 in N/A 570 lb N/A 36 N/A 1.63 in N/A 47.25 in
42125SOIS N/A 42 N/A 53.00 in N/A 2.63 in N/A 4.00 in N/A 46.00 in N/A 42.25 in N/A 650 lb N/A 36 N/A 1.63 in N/A 49.50 in
44125SOIS N/A 44 N/A 55.25 in N/A 2.63 in N/A 4.00 in N/A 48.00 in N/A 44.25 in N/A 690 lb N/A 40 N/A 1.63 in N/A 51.75 in
46125SOIS N/A 46 N/A 57.25 in N/A 2.69 in N/A 4.06 in N/A 50.00 in N/A 46.25 in N/A 730 lb N/A 40 N/A 1.63 in N/A 53.75 in
48125SOIS N/A 48 N/A 59.50 in N/A 2.75 in N/A 4.13 in N/A 52.25 in N/A 48.25 in N/A 800 lb N/A 44 N/A 1.63 in N/A 56.00 in
50125SOIS N/A 50 N/A 61.75 in N/A 2.75 in N/A 4.13 in N/A 54.25 in N/A 50.25 in N/A 830 lb N/A 44 N/A 1.88 in N/A 58.25 in
52125SOIS N/A 52 N/A 64.00 in N/A 2.88 in N/A 4.25 in N/A 56.50 in N/A 52.25 in N/A 920 lb N/A 44 N/A 1.88 in N/A 60.50 in
54125SOIS N/A 54 N/A 66.25 in N/A 3.00 in N/A 4.38 in N/A 58.75 in N/A 54.25 in N/A 1025 lb N/A 44 N/A 1.88 in N/A 62.75 in
60125SOIS N/A 60 N/A 73.00 in N/A 3.13 in N/A 4.50 in N/A 65.25 in N/A 60.25 in N/A 1250 lb N/A 52 N/A 1.88 in N/A 69.25 in
66125SOIS N/A 66 N/A 80.00 in N/A 3.38 in N/A 4.88 in N/A 71.50 in N/A 66.25 in N/A 1625 lb N/A 52 N/A 1.88 in N/A 76.00 in
72125SOIS N/A 72 N/A 86.50 in N/A 3.50 in N/A 5.00 in N/A 78.50 in N/A 72.25 in N/A 1925 lb N/A 60 N/A 1.88 in N/A 82.50 in
78125SOIS N/A 78 N/A 93.00 in N/A 3.88 in N/A 5.38 in N/A 84.50 in N/A 78.25 in N/A 2525 lb N/A 64 N/A 2.13 in N/A 89.00 in
84125SOIS N/A 84 N/A 99.75 in N/A 3.88 in N/A 5.38 in N/A 90.50 in N/A 84.25 in N/A 2600 lb N/A 64 N/A 2.13 in N/A 95.50 in
90125SOIS N/A 90 N/A 106.50 in N/A 4.25 in N/A 5.75 in N/A 96.75 in N/A 90.25 in N/A 3150 lb N/A 68 N/A 2.38 in N/A 102.00 in
96125SOIS N/A 96 N/A 113.25 in N/A 4.25 in N/A 5.75 in N/A 102.75 in N/A 96.25 in N/A 3275 lb N/A 68 N/A 2.38 in N/A 108.50 in
Unit of Measure
1