Flanges MSS Standard
Size 1/2 3/4 1 11/4 11/2 2      
   
A 31/2 37/8 41/4 45/8 5 6      
B 1 3/16 1 1/2 1 15/16 2 5/16 2 9/16 31/16      
C 5/16 11/32 3/8 13/32 7/16 1/2      
D 19/32 5/8 11/16 13/16 7/8 1      
E 0.88 1.09 1.36 1.70 1.95 2.44      
G 1 7/8 21/16 23/16 21/4 27/16 21/2      
L 3/8 7/16 1/2 9/16 5/8 11/16      
Dia. of
Bolt
Circle		 23/8 23/4 31/8 31/2 37/8 43/4      
Dia. of
Bolt
Holes		 5/8 5/8 5/8 5/8 5/8 3/4      
No, of
Bolt
Holes		 4 4 4 4 4 4      

Screwed Slip-on Blind
Welding Neck and Socket Weld Cast (except as noted)

Flanges MSS Standard

Size 21/2 3 4 6 8 10 12    
A 7 71/2 9 11 131/2 16 19    
B 39/16 41/4 55/16 79/16 911/16 12 143/8    
C 9/16 5/8 11/16 13/16 15/16 1 11/16    
D 1 1/8 1 3/16 1 5/16 1 9/16 1 3/4 1 15/16 2 3/16    
E 2.94 3.57 4.57 6.72 8.72 10.88 12.88    
G 23/4 23/4 3 31/2 4 4 41/2    
L 3/4 13/16 - - - - -    
Dia. of
Bolt
Circle		 51/2 6 71/2 91/2 113/4 141/4 17    
Dia. of
Bolt
Holes		 3/4 3/4 3/4 7/8 7/8 1 1    
No, of
Bolt
Holes		 4 4 8 8 8 12 12    

Notes:

  1. General dimensions conform MSS-SP-51

  2. Bolt Hole and Circle Diameters correspond to ASME B16.5 Dimensions

  3. Faces of Flanges are flat and finished with serrated surface

  4. 2-1/2" through 4" MSS Flanges are Forged Material

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