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A lap joint flange (LJF flange) is also called loose flange, it has two components, a stub end and a loose backing flange. Stub end is butt welded to the pipe and backing flanges freely moves over the pipe. LJF flange is particularly used for frequent dismantling or hard-to-adjust pipe connection.
Fabriquées avec des équipements CNC avancés et des processus éprouvés, nos brides, cintres de tuyaux et raccords offrent des dimensions précises, des performances d'étanchéité stables et une installation fiable dans des applications industrielles exigeantes.
Is a solid manufacturer, supplier, stockiest of steel Flanges in China. We can manufacture high quality blind flanges according to international standards, such as ASME/ ANSI B16.5 flanges, ASME/ ANSI B16.47 flanges, JIS flanges, DIN flanges, EN 1092-1 flanges, AWWA flanges, BS 4504 flanges, SABS/ ASNA 1123 flanges, etc., We are an ISO, KR, KS and PED/AD 2000 certified factory and can meet the demanding requirements of the most critical industries.
Dimensions of carbon steel lap joint flanges:
ASME/ANSI : DN 1/2” DN 24”
DIN : DN 15 2000
EN1092: DN 15 – DN 2000
JIS : 15A-1500A
UNI : DN 10 2000 DN
SABS : DN 10-DN 600
GOST : DN 10 1600 DN
Pressure of carbon steel lapped flanges:
ASME/ANSI : Classe 150, 300, 600, 900, 1 500 2 500 livres
DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
EN1092: PN6, PN10, PN16, PN25, PN40, PN64, PN100
JIS : 1K,2K,5K,10K,16K,20K,30K,40K
UNI : PN6, PN10, PN16, PN25, PN40
SABS : 600 KPA, 1 000, 1 600, 2 500, 4 000
GOST : PN6, PN10, PN16, PN25
Material of steel lap joint flanges:
Carbon steel lapped flanges: A105, SS400, SF440 RST37.2, S235JRG2, P250GH, C22.8, etc.
Stainless Steel lapped flanges: ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
DIN2642 Vorschweißflansche/Lose Flange

| DIN 2641 PN 6 Lose Flansche Glatte Bunde | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rohranschlussmaße | Flansch | Schrauben | Bund und Bördel | Gewicht KG | |||||||||||||||
| d1 | D | d6 | b | k | e | Anzahl | Gewinde | d2 | d5 | h3 | d4 | h4 | s1 | s2 | r | ||||
| DN | Reihe 1 | Reihe 2 | max. | min. | min. | min | Flansch | Bund | |||||||||||
| 10 | 14,0 | 75 | 16 | 10 | 50 | 2 | 4 | M10 | 11 | 14,5 | 8 | 35 | 9 | 1,8 | 3,0 | 2 | 0.298 | 0.051 | |
| 10 | 17,2 | 75 | 19 | 10 | 50 | 2 | 4 | M10 | 11 | 17,7 | 8 | 35 | 9 | 1,8 | 3,0 | 2 | 0.298 | 0.051 | |
| 15 | 20,0 | 80 | 22 | 10 | 55 | 2 | 4 | M10 | 11 | 21,0 | 8 | 40 | 9 | 2,0 | 3,0 | 2 | 0.337 | 0.063 | |
| 15 | 21,3 | 80 | 24 | 10 | 55 | 2 | 4 | M10 | 11 | 22,0 | 8 | 40 | 9 | 2,0 | 3,0 | 2 | 0.337 | 0.063 | |
| 20 | 25,0 | 90 | 28 | 10 | 65 | 2 | 4 | M10 | 11 | 26,0 | 10 | 50 | 12 | 2,0 | 3,0 | 2 | 0.418 | 0.116 | |
| 20 | 26,9 | 90 | 30 | 10 | 65 | 2 | 4 | M10 | 11 | 27,6 | 10 | 50 | 12 | 2,0 | 3,0 | 2 | 0.418 | 0.116 | |
| 25 | 30,0 | 100 | 33 | 12 | 75 | 3 | 4 | M10 | 11 | 31,0 | 10 | 60 | 15 | 2,0 | 3,0 | 3 | 0.620 | 0.166 | |
| 25 | 33,7 | 100 | 36 | 12 | 75 | 3 | 4 | M10 | 11 | 34,4 | 10 | 60 | 15 | 2,0 | 3,0 | 3 | 0.620 | 0.166 | |
| 32 | 38,0 | 120 | 42 | 12 | 90 | 3 | 4 | M12 | 14 | 39,0 | 10 | 70 | 15 | 2,6 | 3,5 | 3 | 0.874 | 0.213 | |
| 32 | 42,4 | 120 | 46 | 12 | 90 | 3 | 4 | M12 | 14 | 43,1 | 10 | 70 | 15 | 2,6 | 3,5 | 3 | 0.874 | 0.213 | |
| 40 | 44,5 | 130 | 50 | 12 | 100 | 3 | 4 | M12 | 14 | 45,5 | 10 | 80 | 17 | 2,6 | 3,5 | 3 | 1.01 | 0.273 | |
| 40 | 48,3 | 130 | 54 | 12 | 100 | 3 | 4 | M12 | 14 | 49,0 | 10 | 80 | 17 | 2,6 | 3,5 | 3 | 1.01 | 0.273 | |
| 50 | 57,0 | 140 | 62 | 12 | 110 | 3 | 4 | M12 | 14 | 58,1 | 12 | 90 | 23 | 2,6 | 3,5 | 3 | 1.12 | 0.359 | |
| 50 | 60,3 | 140 | 65 | 12 | 110 | 3 | 4 | M12 | 14 | 61,1 | 12 | 90 | 23 | 2,6 | 3,5 | 3 | 1.12 | 0.359 | |
| 65 | 76,1 | 160 | 81 | 12 | 130 | 3 | 4 | M12 | 14 | 77,1 | 12 | 110 | 23 | 2,6 | 3,5 | 3 | 1.35 | 0.468 | |
| 80 | 88,9 | 190 | 94 | 14 | 150 | 3 | 4 | M16 | 18 | 90,3 | 14 | 128 | 23 | 3,2 | 4,0 | 3 | 2.24 | 0.730 | |
| 100 | 108,0 | 210 | 113 | 14 | 170 | 3 | 4 | M16 | 18 | 109,6 | 14 | 148 | 28 | 3,2 | 4,0 | 3 | 2.59 | 0.884 | |
| 100 | 114,3 | 210 | 119 | 14 | 170 | 3 | 4 | M16 | 18 | 115,9 | 14 | 148 | 28 | 3,2 | 4,0 | 3 | 2.59 | 0.884 | |
| 125 | 133,0 | 240 | 138 | 14 | 200 | 3 | 8 | M16 | 18 | 134,8 | 14 | 178 | 30 | 3,2 | 4,0 | 3 | 3.10 | 1.21 | |
| 125 | 139,7 | 240 | 145 | 14 | 200 | 3 | 8 | M16 | 18 | 141,6 | 14 | 178 | 30 | 3,2 | 4,0 | 3 | 3.10 | 1.21 | |
| 150 | 159,0 | 265 | 164 | 14 | 225 | 3 | 8 | M16 | 18 | 161,1 | 14 | 202 | 30 | 3,2 | 4,0 | 3 | 3.52 | 1.34 | |
| 150 | 168,3 | 265 | 173 | 14 | 225 | 3 | 8 | M16 | 18 | 170,5 | 14 | 202 | 30 | 3,2 | 4,0 | 3 | 3.52 | 1.34 | |
| 200 | 219,1 | 320 | 225 | 16 | 280 | 3 | 8 | M16 | 18 | 221,8 | 16 | 258 | 30 | 3,2 | 4,0 | 3 | 4.98 | 2 | |
| 250 | 267,0 | 375 | 273 | 20 | 335 | 3 | 12 | M16 | 18 | 270,2 | 18 | 312 | 30 | 4,0 | 5,0 | 3 | 7.67 | 2.89 | |
| 250 | 273,0 | 375 | 279 | 20 | 335 | 3 | 12 | M16 | 18 | 276,2 | 18 | 312 | 30 | 4,0 | 5,0 | 3 | 7.67 | 2.89 | |
| 300 | 323,9 | 440 | 329 | 24 | 395 | 4 | 12 | M 20 | 22 | 327,6 | 18 | 365 | 35 | 4,0 | 5,0 | 4 | 12.3 | 3.56 | |
| 350 | 355,6 | 490 | 362 | 26 | 445 | 4 | 12 | M 20 | 22 | 359,7 | 18 | 415 | 4 | 15.1 | 4.08 | ||||
| 350 | 368,0 | 490 | 374 | 26 | 445 | 4 | 12 | M 20 | 22 | 372,2 | 18 | 415 | 4 | 15.1 | 4.08 | ||||
| 400 | 406,4 | 540 | 413 | 28 | 495 | 4 | 16 | M 20 | 22 | 411,0 | 20 | 465 | 4 | 17.7 | 4.91 | ||||
| 400 | 419,0 | 540 | 426 | 28 | 495 | 4 | 16 | M 20 | 22 | 423,7 | 20 | 465 | 4 | 17.7 | 4.91 | ||||
| 500 | 508,0 | 521,0 | 645 | 517 | 32 | 600 | 4 | 20 | M 20 | 22 | 513,6 | 22 | 570 | 4 | 25.4 | 7.39 | |||
| 600 | 610,0 | 620,0 | 755 | 618 | 36 | 705 | 4 | 20 | M24 | 26 | 616,6 | 22 | 670 | 4 | 36.3 | 8.60 | |||
| 700 | 711,0 | 720,0 | 860 | 721 | 40 | 810 | 4 | 24 | M24 | 26 | 718,6 | 24 | 775 | 4 | 48.1 | 14 | |||
| 800 | 813,0 | 820,0 | 975 | 824 | 44 | 920 | 4 | 24 | M27 | 30 | 821,5 | 24 | 880 | 4 | 66.5 | 16.8 | |||
| 900 | 914,4 | 1075 | 926 | 48 | 1020 | 4 | 24 | M27 | 30 | 923.5 | 26 | 980 | 4 | 81.3 | 20.1 | ||||
| 1000 | 1016 | 1175 | 1028 | 52 | 1120 | 4 | 28 | M27 | 30 | 1026.7 | 26 | 1080 | 4 | 96.4 | 21.5 | ||||
| 1200 | 1220 | 1405 | 1232 | 60 | 1340 | 5 | 32 | M30 | 33 | 1232.7 | 28 | 1295 | 6 | 158 | 32.6 | ||||
| DIN 2642 PN 10 Lose Flansche Glatte Bunde | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rohranschlussmaße | Flansch | Schrauben | Bund und Bördel | Gewicht KG | |||||||||||||||
| d1 | D | d6 | b | k | e | Anzahl | Gewinde | d2 | d5 | h3 | d4 | h4 | s1 | s2 | r | ||||
| DN | Reihe 1 | Reihe 2 | max. | min. | min. | min | Flansch | Bund | |||||||||||
| 10 | 14,0 | 90 | 16 | 14 | 60 | 3 | 4 | M12 | 14 | 14,5 | 10 | 40 | 9 | 1,8 | 3,0 | 3 | 0.559 | 0.087 | |
| 10 | 17,2 | 90 | 19 | 14 | 60 | 3 | 4 | M 12 | 14 | 17,7 | 10 | 40 | 9 | 1,8 | 3,0 | 3 | 0.559 | 0.087 | |
| 15 | 20,0 | 95 | 22 | 14 | 65 | 3 | 4 | M12 | 14 | 21,0 | 10 | 45 | 9 | 2,0 | 3,0 | 3 | 0.689 | 0.105 | |
| 15 | 21,3 | 95 | 24 | 14 | 65 | 3 | 4 | M 12 | 14 | 22,0 | 10 | 45 | 9 | 2,0 | 3,0 | 3 | 0.689 | 0.105 | |
| 20 | 25,0 | 105 | 28 | 14 | 75 | 3 | 4 | M12 | 14 | 26,0 | 12 | 58 | 12 | 2,0 | 3,0 | 3 | 0.806 | 0.203 | |
| 20 | 26,9 | 105 | 30 | 16 | 75 | 3 | 4 | M 12 | 14 | 27,6 | 12 | 58 | 12 | 2,0 | 3,0 | 3 | 0.806 | 0.203 | |
| 25 | 30,0 | 115 | 33 | 16 | 85 | 4 | 4 | M 12 | 14 | 31,0 | 12 | 68 | 15 | 2,0 | 3,0 | 4 | 1.110 | 0.276 | |
| 25 | 33,7 | 115 | 36 | 16 | 85 | 4 | 4 | M12 | 14 | 34,4 | 12 | 68 | 15 | 2,0 | 3,0 | 4 | 1.110 | 0.276 | |
| 32 | 38,0 | 140 | 42 | 16 | 100 | 4 | 4 | M 16 | 18 | 39,0 | 12 | 78 | 15 | 2,6 | 3,5 | 4 | 1.640 | 0.343 | |
| 32 | 42,4 | 140 | 46 | 16 | 100 | 4 | 4 | M16 | 18 | 43,1 | 12 | 78 | 15 | 2,6 | 3,5 | 4 | 1.640 | 0.343 | |
| 40 | 44,5 | 150 | 50 | 16 | 110 | 4 | 4 | M16 | 18 | 45,5 | 12 | 88 | 17 | 2,6 | 3,5 | 4 | 1.860 | 0.426 | |
| 40 | 48,3 | 150 | 54 | 16 | 110 | 4 | 4 | M16 | 18 | 49,0 | 12 | 88 | 17 | 2,6 | 3,5 | 4 | 1.860 | 0.426 | |
| 50 | 57,0 | 165 | 62 | 16 | 125 | 5 | 4 | M 16 | 18 | 58,1 | 18 | 102 | 23 | 2,6 | 3,5 | 5 | 2.200 | 0.618 | |
| 50 | 60,3 | 165 | 65 | 16 | 125 | 5 | 4 | M16 | 18 | 61,1 | 18 | 102 | 23 | 2,6 | 3,5 | 5 | 2.200 | 0.618 | |
| 65 | 76,1 | 185 | 81 | 16 | 145 | 5 | 4 | M16 | 18 | 77,1 | 18 | 122 | 23 | 2,6 | 3,5 | 5 | 2.620 | 0.786 | |
| 80 | 88,9 | 200 | 94 | 18 | 160 | 5 | 8 | M16 | 18 | 90,3 | 18 | 138 | 23 | 3,2 | 4,0 | 5 | 3.320 | 1.100 | |
| 100 | 108,0 | 220 | 113 | 18 | 180 | 5 | 8 | M 16 | 18 | 109,6 | 18 | 158 | 28 | 3,2 | 4,0 | 5 | 3.670 | 1.310 | |
| 100 | 114,3 | 220 | 119 | 18 | 180 | 5 | 8 | M16 | 18 | 115,9 | 18 | 158 | 28 | 3,2 | 4,0 | 5 | 3.670 | 1.310 | |
| 125 | 133,0 | 250 | 138 | 18 | 210 | 5 | 8 | M16 | 18 | 134,8 | 18 | 188 | 30 | 3,2 | 4,0 | 5 | 4.540 | 1.960 | |
| 125 | 139,7 | 250 | 145 | 18 | 210 | 5 | 8 | M 16 | 18 | 141,6 | 18 | 188 | 30 | 3,2 | 4,0 | 5 | 4.540 | 1.960 | |
| 150 | 159,0 | 285 | 164 | 18 | 240 | 5 | 8 | M 20 | 22 | 161,1 | 22 | 212 | 30 | 3,2 | 4,0 | 5 | 5.600 | 2.180 | |
| 150 | 168,3 | 285 | 173 | 18 | 240 | 5 | 8 | M 20 | 22 | 170,5 | 22 | 212 | 30 | 3,2 | 4,0 | 5 | 5.600 | 2.180 | |
| 200 | 219,1 | 340 | 225 | 20 | 295 | 5 | 8 | M 20 | 22 | 221,8 | 22 | 268 | 30 | 3,2 | 4,0 | 5 | 7.460 | 3.100 | |
| 250 | 267,0 | 395 | 273 | 22 | 350 | 5 | 12 | M 20 | 22 | 270,2 | 22 | 320 | 30 | 4,0 | 5,0 | 5 | 10.300 | 4.220 | |
| 250 | 273,0 | 395 | 279 | 22 | 350 | 5 | 12 | M 20 | 22 | 276,2 | 22 | 320 | 30 | 4,0 | 5,0 | 5 | 10.300 | 4.220 | |
| 300 | 323,9 | 445 | 329 | 26 | 400 | 5 | 12 | M 20 | 22 | 327,6 | 22 | 370 | 35 | 4,0 | 5,0 0 | 5 | 14.000 | 4.850 | |
| 350 | 355,6 | 505 | 362 | 28 | 460 | 6 | 16 | M 20 | 22 | 359,7 | 22 | 430 | 35 | 6 | 18.500 | 6.710 | |||
| 350 | 368,0 | 505 | 374 | 28 | 460 | 6 | 16 | M 20 | 22 | 372,2 | 22 | 430 | 35 | 6 | 18.500 | 6.710 | |||
| 400 | 406,4 | 565 | 413 | 32 | 515 | 6 | 16 | M 24 | 26 | 411,0 | 26 | 482 | 40 | 6 | 25.000 | 8.280 | |||
| 400 | 419,0 | 565 | 426 | 32 | 515 | 6 | 16 | M 24 | 26 | 423,7 | 26 | 482 | 40 | 6 | 25.000 | 8.280 | |||
| 500 | 508,0 | 521,0 | 670 | 517 | 38 | 620 | 6 | 20 | M 24 | 26 | 513,6 | 26 | 585 | 45 | 6 | 37.000 | 11.500 | ||
| 600 | 610,0 | 620,0 | 780 | 618 | 44 | 725 | 7 | 20 | M 27 | 30 | 616,6 | 30 | 685 | 45 | 7 | 56.300 | 15.600 | ||
| 700 | 711,0 | 720,0 | 895 | 721 | 50 | 840 | 7 | 24 | M27 | 30 | 718,6 | 30 | 800 | 45 | 7 | 80.400 | 23.200 | ||
| 800 | 813,0 | 820,0 | 1015 | 824 | 56 | 950 | 7 | 24 | M 30 | 33 | 821,5 | 33 | 905 | 45 | 7 | 113.200 | 29.200 | ||
| 900 | 914,4 | 1005 | 45 | ||||||||||||||||
| 1000 | 1016 | 1105 | 45 | ||||||||||||||||