Weld Neck Flange Bore Chart

NOMINAL BORE
SchSchSchSTDSchSchEXTSchSchSchSchSchXX
Nom Pipe SizeOD102030Wall4060Hvy80100120140160Hvy
½0.840.674…….…….0.6220.622…….0.5460.546…….…….…….0.4640.252
¾1.050.884…….…….0.8240.824…….0.7420.742…….…….…….0.6120.434
11.3151.097…….…….1.0491.049…….0.9570.957…….…….…….0.8150.599
1 ¼1.661.442…….…….1.381.38…….1.2781.278…….…….…….1.160.896
1 ½1.91.682…….…….1.611.61…….1.51.5…….…….…….1.3381.1
22.3752.157…….…….2.0672.067…….1.9391.939…….…….…….1.6871.503
2 ½2.8752.635…….…….2.4692.469…….2.3232.323…….…….…….2.1251.771
33.53.26…….…….3.0683.068…….2.92.9…….…….…….2.6242.3
3 ½43.76…….…….3.5483.548…….3.3643.364…….…….…….…….2.728
44.54.26…….…….4.0264.026…….3.8263.826…….3.624…….3.4383.152
55.5635.295…….…….5.0475.047…….4.8134.813…….4.563…….4.3134.063
66.6256.357…….…….6.0656.065…….5.7615.761…….5.501…….5.1874.897
88.6258.3298.1258.0717.9817.9817.8137.6257.6257.4377.1877.0016.8136.875
1010.7510.4210.2510.13610.0210.029.759.759.5629.3129.0628.758.58.75
1212.7512.3912.2512.091211.93811.62611.7511.37411.06210.7510.510.12610.75
141413.513.37613.2513.2513.12412.8121312.512.12411.81211.511.188…….
161615.515.37615.2515.251514.6881514.31213.93813.56213.12412.812…….
181817.517.37617.12417.2516.87616.51716.12415.68815.2514.87614.438…….
202019.519.251919.2518.81218.3761917.93817.4381716.516.062…….
222221.5…….…….21.25…….…….21…….…….…….…….…….…….
242423.523.2522.87623.2522.62422.0622321.56220.93820.37619.87619.312…….
2626…….…….…….25.25…….…….25…….…….…….…….…….…….
303029.3762928.7529.25…….…….29…….…….…….…….…….…….
363635.3763534.7535.2534.5…….35…….…….…….…….…….…….
4040…….…….…….39.25…….…….39…….…….…….…….…….…….
4242…….…….…….41.25…….…….41…….…….…….…….…….…….
4848…….…….…….47.25…….…….47…….…….…….…….…….…….

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