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  ANSI Flange PCDs
The American National Standards Institute (ANSI) dimensions for pitch circle diameter of flange bolts, and the bolt sizes for common pipe sizes and flange ratings are shown in the tables below.
- All bolt holes are 1/8" larger than diameter of bolts.
 
See our page on Stud and Nut Sizes to determine the correct nut size.
 
ANSI 150#
Pipe NBBolt PCDNo. of BoltsBolt SizeFlange OD
1/2"2 3/8"41/2"3 1/2"
1"3 1/8"41/2"4 1/4"
2"4 3/4"45/8"6"
4"7 1/2"85/8"9"
6"9 1/2"83/4"11"
8"11 3/4"83/4"13 1/2"
10"14 1/4"127/8"16"
12"17 "127/8"19"
14"18 3/4"121"21"

 
ANSI 300#
Pipe NBBolt PCDNo. of BoltsBolt SizeFlange OD
1/2"2 5/8"41/2"3 3/4"
1"3 1/2"45/8"4 7/8"
2"5"85/8"6 1/2"
4"7 7/8"83/4"10"
6"10 5/8"123/4"12 1/2"
8"13"127/8"15"
10"15 1/4"161"17 1/2"
12"17 3/4"161 1/8"20 1/2"
14"20 1/4"201 1/8"23"

 
ANSI 600#
Pipe NBBolt PCDNo. of BoltsBolt SizeFlange OD
1/2"2 5/8"41/2"3 3/4"
1"3 1/2"45/8"4 7/8"
2"5"85/8"6 1/2"
4"8 1/2"87/8"10 3/4"
6"11 1/2"121"14"
8"13 3/4"121 1/8"16 1/2"
10"17"161 1/4"20"
12"19 1/4"201 1/4"22"
14"20 3/4"201 3/8"23 3/4"

 
ANSI 900#
Pipe NBBolt PCDNo. of BoltsBolt SizeFlange OD
2" *6 1/2"87/8"8 1/2"
4"9 1/4"81 1/8"11 1/2"
6"12 1/2"121 1/8"15"
8"15 1/2"121 3/8"18 1/2"
10"18 1/2"161 3/8"21 1/2"
12"21"201 3/8"24"
14"22"201 1/2"25 1/4"
* 2" Class 1500 is used for 2" Class 900

 
ANSI 1500#
Pipe NB Bolt PCD No. of Bolts Bolt Size Flange OD
2" 6 1/2" 8 7/8" 8 1/2"
4" 9 1/2" 8 1 1/4" 12 1/4"
6" 12 1/2" 12 1 3/8" 15 1/2"
8" 15 1/2" 12 1 5/8" 19"

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Further Reading
Flange Fittings and Piping Data
 
Pocket Guide to Flanges, Fittings & Piping Data
Piping Engineering Leadership for Process Plant Projects
 
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