Standard's Reference's Chart Size Holes D. S. Drg. St d. (in) Std(mm) D.S. Drg. St d.(i n) Std(mm) D.S. Dr g. St d.(i n) St d( mm) D.S. Drg. Std. (in) Std(mm) Drg. Std. (in) Std(mm) 2" 6 152.4 121 4.75 120.65 19 0.62 15.74 178 7 178 19 0.75 19.05 4 3" 191 191 7.5 190.5 152 6 152.4 20 20 0.75 19.05 203 203 7.99 203 19 0.75 19.05 4 4" 229 228.6 9 228.6 190.56 191 7.5 190.5 25 25 0.94 23.876 229 229 9 229 19 0.75 19.05 8 6" 279 279.4 11 279.4 241.3 241 9.5 241.3 27 27 1 25.4 267 267 10.5 267 22.2 0.88 22.35 8 8" 343 343 13.5 342.9 298.45 298 11.75 298.45 29 29 1.12 28.448 292 292 11.5 292 22.2 0.88 22.35 8 10" 406 406 16 406.4 361.95 362 14.25 361.95 31 31 1.19 30.226 330 330 12.99 330 25.4 1 25.4 12 12" 483 483 19 482.6 431.8 432 17 431.8 33 33 1.25 31.75 356 356 14 356 25.4 1 25.4 12 14" 532.9 533 21 533.4 475.99 476 18.75 476.25 35.56 35.5 1.38 35.052 380 381 15 381 29 1.12 28.45 12 16" 596.9 597 23.5 596.9 539.75 540 21.25 539.75 36.58 36.5 1.44 36.576 406.4 406 15.98 406 28.8 1.12 28.45 16 18" 635 635 25 635 577.85 578 22.75 577.85 39.6 1.56 39.6 431.8 432 17 431.8 33 1.25 31.75 16 20" 698.5 699 27.5 698.5 635 635 25 635 43 1.69 42.926 457.2 457 17.99 457 33 1.25 31.75 20 24" 812.8 813 32 812.8 749.3 749 29.5 749.3 48 1.88 47.75 508 508 20 508 36 1.38 35.05 20 Abbreviation : DS-Data Sheet in mm ASME/ANSI B16.42/B16.5 +1.52mm 4"-8" +1.5. 10"-12",16" +0/-3 ASME/ANSI B16.42/B16.5 +1.52mm 3"-16" +/-1.5 ASME/ANSI B16.42/B16.5 Up to 18" +3.05mm, -0 14"-16" +3/-0. 20"-24" +4.8/-0 20" and above +4.83mm, -0 ASME/ANSI B16.10 Up to 10" 1.52mm 2"+2, 3"-10"+1.6 12" and above 3.05mm 12"-16"+3.2, 18"-24"+4 3"-16" + 1.5/-0 Note : Fl. Thickness 2"-0.62in (15.74mm); 3" -0.75in (19.05mm) as per ANSI B16.1, CL.125 STD. Ref. : 1) ASME/ANSI B16.1 C.I. Pi pe Fl anges & Flanged fit ti ngs CI. 25,125 and 250 2) ASME/ANSI B16.42 D.I . Pipe Flanges & Flanged fi tt ings CI .150 and 300 3) ASME/ANSI B16.5 Pi pe Flanges & Flanged fi tt ings NPS 1/2 Through NPS 24 4) ASME/ANSI B16.10 Face t o Face and End t o End Di mensions of Valves Bolt Hole Drg-Drawing in mm Fl. Dia PCD FL. Thickness FTF Bolt Hole Dia. ITEM STD'S TOLERANCE TOL.IN DRG. Fl. Dia PCD Flange Thickness FTF
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