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BLIND FLANGES
U.S. STANDARDS
| NOM. DIA. |
OUTSIDE DIA. |
T H K. | BOLT CIRC. DIA. |
NUMBER OF BOLTS |
DIA. OF BOLT HOLES |
WEIGHT |
| O.D. | T. | B.C.D. | ||||
| 21/2 | 7.00 | .750 | 5.50 | 4 | .750 | 8.5 |
| 3 | 7.50 | .750 | 6.00 | 4 | .750 | 9.8 |
| 4 | 9.00 | .750 | 7.50 | 8 | .750 | 14.0 |
| 6 | 11.00 | .750 | .950 | 8 | .875 | 21.3 |
| 8 | 13.50 | .750 | 11.75 | 8 | .875 | 32.2 |
| 10 | 16.00 | 1.000 | 14.25 | 12 | 1.000 | 58.4 |
| 12 | 19.00 | 1.000 | 17.00 | 12 | 1.000 | 83.1 |
| 14 | 21.00 | 1.125 | 18.75 | 12 | 1.125 | 113.0 |
| 16 | 23.50 | 1.125 | 21.25 | 16 | 1.125 | 142.0 |
| 18 | 25.00 | 1.250 | 22.75 | 16 | 1.250 | 179.0 |
| 20 | 27.50 | 1.250 | 25.00 | 20 | 1.250 | 217.5 |
| 24 | 32.00 | 1.375 | 29.50 | 20 | 1.375 | 323.0 |
| 30 | 38.75 | 1.375 | 36.00 | 28 | 1.375 | 449.9 |
| 36 | 46.00 | 1.375 | 42.75 | 32 | 1.625 | 628.9 |
| 42 | 53.00 | 1.375 | 49.50 | 36 | 1.625 | 840.6 |
| 48 | 59.50 | 1.375 | 56.00 | 44 | 1.625 | 1060.6 |
| 54 | 66.25 | 1.375 | 62.75 | 44 | 1.875 | 1315.0 |
| 60 | 73.00 | 1.375 | 69.25 | 52 | 1.875 | 1598.1 |
Blind Flanges are available from stock in galvanized mild
steel with stainless steel 316, .078" thick cladding.
Also available upon request in solid stainless steel,
primed mild steel, various types of thicknesses of cladding,
flange thickness, and diameter.