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  • 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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Industry Standard Class 125 Slip-On Flange
Unit of Measure
1 2 

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)

52125SOISLW N/A 52 N/A 64.00 in N/A 1.38 in N/A 2.50 in N/A 55.00 in N/A 52.25 in N/A 475 lb N/A 44 N/A 1.88 in N/A 60.50 in
54125SOISLW N/A 54 N/A 66.25 in N/A 1.38 in N/A 2.50 in N/A 57.00 in N/A 54.25 in N/A 500 lb N/A 44 N/A 1.88 in N/A 62.75 in
60125SOISLW N/A 60 N/A 73.00 in N/A 1.50 in N/A 2.75 in N/A 63.00 in N/A 60.25 in N/A 640 lb N/A 52 N/A 1.88 in N/A 69.25 in
66125SOISLW N/A 66 N/A 80.00 in N/A 1.50 in N/A 2.75 in N/A 69.00 in N/A 66.25 in N/A 750 lb N/A 52 N/A 1.88 in N/A 76.00 in
72125SOISLW N/A 72 N/A 86.50 in N/A 1.50 in N/A 2.75 in N/A 75.00 in N/A 72.25 in N/A 850 lb N/A 60 N/A 1.88 in N/A 82.50 in
78125SOISLW N/A 78 N/A 93.00 in N/A 1.75 in N/A 3.00 in N/A 81.25 in N/A 78.25 in N/A 950 lb N/A 64 N/A 2.13 in N/A 89.00 in
84125SOISLW N/A 84 N/A 99.75 in N/A 1.75 in N/A 3.00 in N/A 87.50 in N/A 84.25 in N/A 1000 lb N/A 64 N/A 2.13 in N/A 95.50 in
90125SOISLW N/A 90 N/A 106.50 in N/A 2.00 in N/A 3.25 in N/A 93.75 in N/A 90.25 in N/A 1500 lb N/A 68 N/A 2.38 in N/A 102.00 in
96125SOISLW N/A 96 N/A 113.25 in N/A 2.00 in N/A 3.25 in N/A 100.00 in N/A 96.25 in N/A 1650 lb N/A 68 N/A 2.38 in N/A 108.50 in
Unit of Measure
1 2