• Industry Standard Class 125 Slip-On Flange
  • All dimensions are in inches.
  • The pressure rating at atmospheric temperature is 175 psi for 6” - 12” and 150 psi for 14” - 96”.
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Item #

Nominal Pipe Size

Outside Diameter (O)

Thickness (T)

Overall Thickness (Y)

Hub Diameter (X)

Inside Diameter (B)

Approximate Weight (lbs)

Number of Bolt Holes

Diameter of Bolt Holes

Diameter of Bolt Circle (C)

04125SOISLW N/A 4 N/A 9.00 N/A 0.500 N/A 0.875 N/A 5.312 N/A 4.57 N/A 7 N/A 8 N/A 0.750 N/A 7.50
05125SOISLW N/A 5 N/A 10.00 N/A 0.562 N/A 1.250 N/A 6.312 N/A 5.66 N/A 8 N/A 8 N/A 0.875 N/A 8.50
06125SOISLW N/A 6 N/A 11.00 N/A 0.562 N/A 1.250 N/A 7.562 N/A 6.72 N/A 13 N/A 8 N/A 0.875 N/A 9.50
08125SOISLW N/A 8 N/A 13.50 N/A 0.562 N/A 1.250 N/A 9.688 N/A 8.72 N/A 18 N/A 8 N/A 0.875 N/A 11.75
10125SOISLW N/A 10 N/A 16.00 N/A 0.688 N/A 1.250 N/A 12.000 N/A 10.88 N/A 26 N/A 12 N/A 1.000 N/A 14.25
12125SOISLW N/A 12 N/A 19.00 N/A 0.688 N/A 1.250 N/A 14.375 N/A 12.88 N/A 42 N/A 12 N/A 1.000 N/A 17.00
14125SOISLW N/A 14 N/A 21.00 N/A 0.750 N/A 1.250 N/A 15.750 N/A 14.14 N/A 44 N/A 12 N/A 1.125 N/A 18.75
16125SOISLW N/A 16 N/A 23.50 N/A 0.750 N/A 1.250 N/A 18.000 N/A 16.16 N/A 58 N/A 16 N/A 1.125 N/A 21.25
18125SOISLW N/A 18 N/A 25.00 N/A 0.750 N/A 1.250 N/A 19.875 N/A 18.18 N/A 59 N/A 16 N/A 1.250 N/A 22.75
20125SOISLW N/A 20 N/A 27.50 N/A 0.750 N/A 1.250 N/A 22.000 N/A 20.20 N/A 69 N/A 20 N/A 1.250 N/A 25.00
22125SOISLW N/A 22 N/A 29.50 N/A 1.000 N/A 1.750 N/A 24.250 N/A 22.22 N/A 76 N/A 20 N/A 1.375 N/A 27.25
24125SOISLW N/A 24 N/A 32.00 N/A 1.000 N/A 1.750 N/A 26.125 N/A 24.25 N/A 115 N/A 20 N/A 1.375 N/A 29.50
26125SOISLW N/A 26 N/A 34.25 N/A 1.000 N/A 1.750 N/A 28.500 N/A 26.25 N/A 125 N/A 24 N/A 1.375 N/A 31.75
28125SOISLW N/A 28 N/A 36.50 N/A 1.000 N/A 1.750 N/A 30.500 N/A 28.25 N/A 140 N/A 28 N/A 1.375 N/A 34.00
30125SOISLW N/A 30 N/A 38.75 N/A 1.000 N/A 1.750 N/A 32.500 N/A 30.25 N/A 150 N/A 28 N/A 1.375 N/A 36.00
32125SOISLW N/A 32 N/A 41.75 N/A 1.125 N/A 1.750 N/A 34.750 N/A 32.25 N/A 205 N/A 28 N/A 1.625 N/A 38.50
34125SOISLW N/A 34 N/A 43.75 N/A 1.125 N/A 1.750 N/A 36.750 N/A 34.25 N/A 215 N/A 32 N/A 1.625 N/A 40.50
36125SOISLW N/A 36 N/A 46.00 N/A 1.125 N/A 1.750 N/A 38.750 N/A 36.25 N/A 235 N/A 32 N/A 1.625 N/A 42.75
38125SOISLW N/A 38 N/A 48.75 N/A 1.125 N/A 1.750 N/A 40.750 N/A 38.25 N/A 265 N/A 32 N/A 1.625 N/A 45.25
40125SOISLW N/A 40 N/A 50.75 N/A 1.125 N/A 1.750 N/A 43.000 N/A 40.25 N/A 280 N/A 36 N/A 1.625 N/A 47.25
42125SOISLW N/A 42 N/A 53.00 N/A 1.250 N/A 1.750 N/A 45.000 N/A 42.25 N/A 330 N/A 36 N/A 1.625 N/A 49.50
44125SOISLW N/A 44 N/A 55.25 N/A 1.250 N/A 2.250 N/A 47.000 N/A 44.25 N/A 350 N/A 40 N/A 1.625 N/A 51.75
46125SOISLW N/A 46 N/A 57.25 N/A 1.250 N/A 2.250 N/A 49.000 N/A 46.25 N/A 365 N/A 40 N/A 1.625 N/A 53.75
48125SOISLW N/A 48 N/A 59.50 N/A 1.375 N/A 2.500 N/A 51.000 N/A 48.25 N/A 425 N/A 44 N/A 1.625 N/A 56.00
50125SOISLW N/A 50 N/A 61.75 N/A 1.375 N/A 2.500 N/A 53.000 N/A 50.25 N/A 450 N/A 44 N/A 1.875 N/A 58.25
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