#400 Flange Bolt Chart

400 Class Flanges

Nominal Pipe SizeWrench Size (inches)Number of StudsDiameter of Studs (inches)Length of Stud - RF (inches)Length of Stud - RTJ (inches)
1/27/841/233
3/41-1/1645/83-1/23-1/2
11-1/1645/83-1/23-1/2
1-1/41-1/1645/83-3/43-3/4
1-1/21-1/443/44-1/44-1/4
21-1/1685/84-1/44-1/4
2-1/21-1/483/44-3/44-3/4
31-1/483/455
3-1/21-7/1687/85-1/25-1/2
41-7/1687/85-1/25-1/2
51-7/1687/85-3/45-3/4
61-7/16127/866
81-5/81216-3/46-3/4
101-13/16161-1/87-1/27-1/2
122161-1/488
142201-1/48-1/48-1/4
162-3/16201-3/88-3/48-3/4
182-3/16241-3/899
202-3/8241-1/29-1/29-3/4
222-9/16241-5/81010-1/4
242-3/4241-3/410-1/211

Source: "ASME B16.5-2020 Table 13C Templates for Drilling Class 400 Pipe Flanges"


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