#900 Flange Bolt Chart

Warning: For reference only

Bolt lengths are sourced from the ASME standard listed at bottom. Exact bolt lengths will vary based on inputs. For more detailed calculations we recommend using the app.

900 Class Flanges

Nominal Pipe SizeWrench Size (inches)Number of StudsDiameter of Studs (inches)Length of Stud - RF (inches)Length of Stud - RTJ (inches)
1/21.2540.754.254.25
3/41.2540.754.54.5
11.43840.87555
1-1/41.43840.87555
1-1/21.625415.55.5
21.43880.8755.755.75
2-1/21.625816.256.25
31.43880.8755.755.75
41.81381.1256.756.75
5281.257.57.5
61.813121.1257.57.75
82.188121.3758.758.75
102.188161.3759.259.25
122.188201.3751010
142.375201.510.7511
162.563201.62511.2511.5
182.938201.87512.7513.25
203.12520213.7514.25
243.875202.517.2518

Source: "ASME B16.5-2020 Table 17C Templates for Drilling Class 900 Pipe Flanges and Flanged Fittings"


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