300lb. ASME B16.5 WELDING NECK FLANGE

Common Diameters and Wall Thicknesses

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RING JOINT FLANGES - CLASSES 300, 400, and 600 - ANSI B16.5 ASTM A105
Nominal pipe size Pitch diameter of ring and groove Width of Ring Height of Ring Width of flat on octagonal rings Width of groove Depth of groove(1) Diameter of raised face for ring joint or lapped Ring number Approx. distance between flanges of ring jints when ring is compressed (2)
Oval Octagonal
P A B H C D L R 300 CL. 400 CL. 600 CL.
1/2" 1.344 1/4 7/16 3/8 0.170 0.281 0.219 2.00 R 11 0.12 0.12 0.12
3/4" 1.688 5/16 9/16 1/2 0.206 0.344 0.250 2.50 R 13 0.16 0.16 0.16
1" 2.00 5/16 9/16 1/2 0.206 0.344 0.250 2.75 R 16 0.16 0.16 0.16
1-1/4" 2.375 5/16 9/16 1/2 0.206 0.344 0.250 3.12 R 18 0.16 0.16 0.16
1-1/2" 2.688 5/16 9/16 1/2 .206 .344 .250 3.56 R 20 0.16 0.16 0.16
2" 3.250 7/16 11/16 5/8 0.305 0.469 0.312 4.25 R 23 0.22 0.19 0.19
2-1/2" 4.00 7/16 11/16 5/8 0.305 0.469 0.312 5.00 R 26 0.22 0.19 0.19
3" 4.875* 7/16 11/16 5/8 0.305 0.469 0.312 5.75 R 31* 0.22 0.19 0.19
3-1/2" 5.188 7/16 11/16 5/8 0.305 0.469 0.312 6.25 R 34 0.22 0.19 0.19
4" 5.875 7/16 11/16 5/8 0.305 0.469 0.312 6.88 R 37 0.22 0.22 0.19
5" 7.125 7/16 11/16 5/8 0.305 0.469 0.312 8.25 R 41 0.22 0.22 0.19
6" 8.312 7/16 11/16 5/8 0.305 0.469 0.312 9.50 R 45 0.22 0.22 0.19
8" 10.625 7/16 11/16 5/8 0.305 0.469 0.312 11.88 R 49 0.22 0.22 0.19
10" 12.750 7/16 11/16 5/8 0.305 0.469 0.312 14.00 R 53 0.22 0.22 0.19
12" 15.000 7/16 11/16 5/8 0.305 0.469 0.312 16.25 R 57 0.22 0.22 0.19
14" 16.500 7/16 11/16 5/8 0.305 0.469 0.312 18.00 R 61 0.22 0.22 0.19
16" 18.500 7/16 11/16 5/8 0.305 0.469 0.312 20.00 R 65 0.22 0.22 0.19
18" 21.000 7/16 11/16 5/8 0.305 0.469 0.312 22.62 R 69 0.22 0.22 0.19
20" 23.000 1/2 3/4 11.16 0.341 0.531 0.375 25.00 R 73 0.22 0.22 0.19
24" 27.250 5/8 7/8 13/16 0.413 0.656 0.438 29.50 R 77 0.25 0.25 0.22

150 lb. and 300 lb. flanges have a 1/16" raised face which is included in the Thicknesses C and the Length Y.
400 lb. through 900 lb. flanges have a 1/4" raised face which is not included in C or Y.
Call Lynco at 1-800-749-5539 for further assistance.


  • Flange Bores & Dimensions Chart (1)
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