Gasket Dimensions for Full Face Class 300
 
per MSS-SP44 and C207-55 AWWA  
Pipe Gasket Bolt Holes Pipe Gasket Bolt Holes  
Size O. D. No. Size B.C. Dia Size O.D. No. Size B.C. Dia.  
                     
1/4"         14" 23" 20 1 - 1/4" 20 - 1/4"  
3/8"         *15" 24 - 1/2" 20 1 - 3/8" 21 - 1/2"  
1/2" 3 - 3/4" 4 5/8" 2 - 5/8" 16" 25 - 1/2" 20 1 - 3/8" 22 - 1/2"  
3/4" 4 - 5/8" 4 3/4" 3 - 1/4" 18" 28" 24 1 - 3/8" 24 - 3/4"  
1"  4 - 7/8" 4 3/4" 3 - 1/2" 20" 30 - 1/2" 24 1 - 3/8" 27"  
1 - 1/4" 5 - 1/4" 4 3/4" 3 - 7/8" *22" 33" 24 1 - 5/8" 29 - 1/4"  
1 - 1/2" 6 - 1/8" 4 7/8" 4 - 1/2" 24" 36" 24 1 - 5/8" 32"  
2" 6 - 1/2" 8 3/4" 5" *26" 38 - 1/4" 28 1 - 7/8" 34 - 1/2"  
2 - 1/2" 7 - 1/2" 8 7/8" 5 - 7/8" *28" 40 - 3/4" 28 1 - 7/8" 37"  
3" 8 - 1/4" 8 7/8" 6 - 5/8" 30" 43" 28 2" 39 - 1/4"  
3 - 1/2" 9" 8 7/8" 7 - 1/4" *32" 45 - 1/4" 28 2 - 1/8" 41 - 1/2"  
4" 10" 8 7/8" 7 - 7/8" *34" 47 - 1/2" 32 2 - 1/8" 43 - 1/2"  
* 4 - 1/2" 10 - 1/2" 8 7/8" 8 - 1/2" 36" 50" 32 2 - 1/4" 46"  
5" 11" 8 7/8" 9 - 1/4" *38" 52 - 1/4" 36 2 - 1/4" 48"  
6" 12 - 1/2" 12 7/8" 10 - 5/8" *40" 54 - 1/2" 36 2 - 1/4" 50 - 1/4"  
* 7" 14" 12 1" 11 - 7/8" 42" 57" 36 2 - 1/4" 52 - 3/4"  
8" 15" 12 1" 13" *44" 59 - 1/4" 40 2 - 1/4" 55"  
* 9" 16 - 1/4" 12 1 - 1/8" 14" *46" 61 - 1/2" 40 2 - 1/4" 57 - 1/4"  
10" 17 - 1/2" 16 1 - 1/8" 15 - 1/4" 48" 65"     60 - 3/4"  
12" 20 - 1/2" 16 1 - 1/4" 17 - 3/4"            
                     
*Sizes marked are not in current flange standards but are still used.    
NOTE: Bolt Holes in Flanges 26" and larger may be specified 1/8" less in diameter  
All technical advice and recommendation are rendered by seller free of charge.  
While based on data believed to be reliable, seller assumes no responsibility.