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  • Industry Standard Class 125 Large Diameter Class 125/150 lb. Welding Neck Flange
  • All dimensions are in inches.
  • These flanges will be furnished with a 1/16" raised face unless otherwise specified.
  • Flat face option available.

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Item #

Nominal Pipe Size

Outside Diameter (O)

Thickness (T)

Overall Thickness (Y)

Point of Weld (A)

Hub Diameter (X)

Inside Diameter (B)

Approximate Weight

Number of Bolt Holes

Diameter of Bolt Holes

Diameter of Bolt Circle (C)

N/A 26 N/A 34.25 in N/A 2.00 in N/A 5.00 in N/A 26.00 in N/A 28.50 in N/A Specified by purchaser N/A 260 lb N/A 24 N/A 1.38 in N/A 31.75 in
N/A 28 N/A 36.50 in N/A 2.06 in N/A 5.06 in N/A 28.00 in N/A 30.75 in N/A Specified by purchaser N/A 295 lb N/A 28 N/A 1.38 in N/A 34.00 in
N/A 30 N/A 38.75 in N/A 2.13 in N/A 5.13 in N/A 30.00 in N/A 32.75 in N/A Specified by purchaser N/A 340 lb N/A 28 N/A 1.38 in N/A 36.00 in
N/A 32 N/A 41.75 in N/A 2.25 in N/A 5.25 in N/A 32.00 in N/A 35.00 in N/A Specified by purchaser N/A 410 lb N/A 28 N/A 1.63 in N/A 38.50 in
N/A 34 N/A 43.75 in N/A 2.31 in N/A 5.31 in N/A 34.00 in N/A 37.00 in N/A Specified by purchaser N/A 440 lb N/A 32 N/A 1.63 in N/A 40.50 in
N/A 36 N/A 46.00 in N/A 2.38 in N/A 5.38 in N/A 36.00 in N/A 39.25 in N/A Specified by purchaser N/A 495 lb N/A 32 N/A 1.63 in N/A 42.75 in
N/A 38 N/A 48.75 in N/A 2.38 in N/A 5.38 in N/A 38.00 in N/A 41.75 in N/A Specified by purchaser N/A 570 lb N/A 32 N/A 1.63 in N/A 45.25 in
N/A 40 N/A 50.75 in N/A 2.50 in N/A 5.50 in N/A 40.00 in N/A 43.75 in N/A Specified by purchaser N/A 620 lb N/A 36 N/A 1.63 in N/A 47.25 in
N/A 42 N/A 53.00 in N/A 2.63 in N/A 5.63 in N/A 42.00 in N/A 46.00 in N/A Specified by purchaser N/A 710 lb N/A 36 N/A 1.63 in N/A 49.50 in
N/A 44 N/A 55.25 in N/A 2.63 in N/A 5.63 in N/A 44.00 in N/A 48.00 in N/A Specified by purchaser N/A 750 lb N/A 40 N/A 1.63 in N/A 51.75 in
N/A 46 N/A 57.25 in N/A 2.69 in N/A 5.69 in N/A 46.00 in N/A 50.00 in N/A Specified by purchaser N/A 800 lb N/A 40 N/A 1.63 in N/A 53.75 in
N/A 48 N/A 59.50 in N/A 2.75 in N/A 5.75 in N/A 48.00 in N/A 52.25 in N/A Specified by purchaser N/A 870 lb N/A 44 N/A 1.63 in N/A 56.00 in
N/A 50 N/A 61.75 in N/A 2.75 in N/A 5.75 in N/A 50.00 in N/A 54.25 in N/A Specified by purchaser N/A 900 lb N/A 44 N/A 1.88 in N/A 58.25 in
N/A 52 N/A 64.00 in N/A 2.88 in N/A 5.88 in N/A 52.00 in N/A 56.50 in N/A Specified by purchaser N/A 1000 lb N/A 44 N/A 1.88 in N/A 60.50 in
N/A 54 N/A 66.25 in N/A 3.00 in N/A 6.00 in N/A 54.00 in N/A 58.75 in N/A Specified by purchaser N/A 1100 lb N/A 44 N/A 1.88 in N/A 62.75 in
N/A 60 N/A 73.00 in N/A 3.13 in N/A 6.13 in N/A 60.00 in N/A 65.25 in N/A Specified by purchaser N/A 1350 lb N/A 52 N/A 1.88 in N/A 69.25 in
N/A 66 N/A 80.00 in N/A 3.38 in N/A 6.38 in N/A 66.00 in N/A 71.50 in N/A Specified by purchaser N/A 1775 lb N/A 52 N/A 1.88 in N/A 76.00 in
N/A 72 N/A 86.50 in N/A 3.50 in N/A 6.50 in N/A 72.00 in N/A 78.50 in N/A Specified by purchaser N/A 2100 lb N/A 60 N/A 1.88 in N/A 82.50 in
N/A 84 N/A 99.75 in N/A 3.88 in N/A 6.88 in N/A 84.00 in N/A 90.50 in N/A Specified by purchaser N/A 2825 lb N/A 64 N/A 2.13 in N/A 95.50 in
N/A 96 N/A 113.25 in N/A 4.25 in N/A 7.25 in N/A 96.00 in N/A 102.75 in N/A Specified by purchaser N/A 3800 lb N/A 68 N/A 2.38 in N/A 108.50 in
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