GOST / FLAT 12821-80 Flanges

GOST 12821-80, 12821-80 WELD NECK FLANGES
Weld Neck
DN15-DN1000 DN15-DN1000 DN15-DN1000 DN15-DN1000 DN15-DN800 DN15-DN600 DN15-DN500

aFlantsy flat steel welded to the connecting protrusion according to GOST 12820-80

Dimensions :
gost 12821 80 flanges dimensions


GOST 12821-80 Flange PN0.6MPa
Conditional pass Dy d1 b h4 Dm Dn Масса, кг
a coupling protrusion a protrusion Recessed with spike with pazom
10 8 10 27 22 15 0,34 0,34 0,32 0,34 0,33
15 12 28 28 19 0,40 0,40 0,38 0,40 0,40
20 18 30 36 26 0,53 0,53 0,50 0,53 0,52
25 25 12 42 33 0,76 0,77 0,72 0,75 0,75
32 31 33 50 39 1,10 1,08 1,04 1,08 1,08
40 38 35 60 46 1,36 1,37 1,28 1,30 1,34
50 49 70 58 1,53 1,51 1,44 1,46 1,47
65 66 88 77 1,97 2,06 1,83 1,72 1,75
80 78 13 37 102 90 2,76 2,76 2,80 2,65 2,72
100 96 38 122 110 3,35 3,04 3,03 3,03 3,04
125 121 15 40 148 135 4,66 4,24 3,66 4,50 4,55
150 146 43 172 161 5,37 5,85 4,93 5,29 5,35
(175) 177 17 47 210 196 7,32 8,10 6,92 7,11 7,16
200 202 50 235 222 8,37 9,35 7,75 7,98 8,05
(225) 226 260 248 9,45 9,25 8,72 8,98 9,06
250 254 18 288 278 10,99 10,69 10,14 12,20 12,30
300 303 340 330 14,82 14,28 14,10 13,81 14,11
350 351 390 382 17,69 18,65 17,64 16,35 16,72
400 398 440 432 20,55 19,69 19,30 18,83 19,31
(450) 450 494 484 23,63 23,60 21,90 21,62 22,24
500 501 19 545 535 26,63 29,10 25,90 24,44 25,10
600 602 55 650 636 35,79 35,60 33,40 37,49 33,67
(700) 692 740 726 44,31 44,10 41,10 40,60 41,86
800 792 60 844 826 56,17 55,20 52,20 51,67 53,36
(900) 892 21 944 926 66,79 - - - -
1000 992 1044 1028 73,51
1200 1192 23 70 1248 1228 111,43
1400 1392 27 85 1456 1428 156,58
1600 1592 32 95 1660 1628 218,57


Marking & Packing
Our products like flanges are packaged to make sure that there’s no damage throughout transit. Just in case of exports, customary export packaging is completed in wooden boxes or cases. All flanges are marked with Trademark (Company’s LOGO), Grade, Size and Lot No. On requests we can do custom marking on our products.

Test Certificates
Manufacturer Test Certificate as per EN 10204-3.1, EN 10204-3.2, Raw Materials Certificate, NABL approved Lab Test Report, 100% Radiography Test Report, Third Party Inspection Report etc.