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                       | ITALIAN STANDARDS UNI 2276 PLATE FLANGE PN 6 |  
                       | Directions for the designation | d1 | a | b | D | f | Holes | Screws | Weight* Kg
 |  
                       | Rated Diameter
 | External diameter of the pipe
 | Nominal | Tolerance |  
                       | 15 | 20 | 20,5 | +0,5 | 55 | 10 | 80 | 11 | 4 | M 10 | 0,34 |  
                       | 21,3 | 22 | 0,33 |  
                       | 20 | 25 | 25,5 | 65 | 12 | 90 | 11 | 4 | M 10 | 0,51 |  
                       | 26,9 | 27,5 | 0,50 |  
                       | 25 | 30 | 30,5 | 75 | 12 | 100 | 11 | 4 | M 10 | 0,63 |  
                       | 33,7 | 34 | 0,61 |  
                       | 32 | 38 | 38,5 | 90 | 14 | 120 | 14 | 4 | M 12 | 1,09 |  
                       | 42,4 | 43 | 1,05 |  
                       | 40 | 44,5 | 45 | 100 | 14 | 130 | 14 | 4 | M 12 | 1,26 |  
                       | 48,3 | 49 | 1,23 |  
                       | 50 | 57 | 58 | 110 | 14 | 140 | 14 | 4 | M 12 | 1,38 |  
                       | 60,3 | 61,5 | 1,35 |  
                       | 65 | 76,1 | 77 | 130 | 14 | 160 | 14 | 4 | M 12 | 1,68 |  
                       | 80 | 88,9 | 90 | 150 | 16 | 190 | 18 | 4 | M 16 | 2,63 |  
                       | 100 | 108 | 109 | +1,0 | 170 | 16 | 210 | 18 | 4*** | M 16 | 3,05 |  
                       | 114,3 | 115,5 | 2,92 |  
                       | 125 | 133 | 134,5 | 200 | 18 | 240 | 18 | 8 | M 16 | 4,11 |  
                       | 139,7 | 141 | 3,90 |  
                       | 150 | 159 | 160,5 | 225 | 20 | 265 | 18 | 8 | M 16 | 5,16 |  
                       | 168,3 | 170 | 4,78 |  
                       | 175 | 193,7 | 195,5 | 255 | 22 | 295 | 18 | 8 | M 16 | 6,27 |  
                       | 200 | 219,1 | 221 | 280 | 22 | 320 | 18 | 8 | M 16 | 6,91 |  
                       | 250 | 267 | 269 | 335 | 24 | 375 | 18 | 12 | M 16 | 9,53 |  
                       | 273 | 275 | 9,04 |  
                       | 300 | 323,9 | 326 | 395 | 24 | 440 | 22 | 12 | M 20 | 12,1 |  
                       | 350 | 355,6 | 358 | 445 | 26 | 490 | 22 | 12 | M 20 | 17,0 |  
                       | 368 | 370,5 | 15,6 |  
                       | 400 | 406,4 | 409 | +1,5 | 495 | 28 | 540 | 22 | 16 | M 20 | 20,1 |  
                       | 419 | 422 | 18,3 |  
                       | 450 | 457,2 | 460,2 | ±5 | 550 | 28 | 595 | 22 | 16 | M 20 | 25,8 |  
                       | 500 | 508 | 511 | 600 | 30 | 645 | 22 | 20 | M 20 | 30,0 |  
                       | 600 | 609,6 | 612,6 | 705 | 30 | 755 | 25 | 20 | M 22 | 37,9 |  
                       | 700 | 711,2 | 714,2 | 810 | 32 | 860 | 25 | 24 | M 22 | 47,9 |  
                       | 800 | 812,8 | 815,8 | 920 | 34 | 975 | 30 | 24 | M 27 | 62,9 |  
                       | 900 | 914,4 | 917,4 | 1020 | 36 | 1075 | 30 | 24 | M 27 | 74,6 |  
                       | 1000 | 1016 | 1019 | 1120 | 36 | 1175 | 30 | 28 | M 27 | 81,9 |  
                       | * | The weight is approximate and calculated on base   7.85 Kg/dm3 |  
                       | ** | Raw hole to be worked again according to the real   external diameter of the pipe |  
                       | *** | For oil piping the flange should have 8 holes |  |