The lap joint flange derived it name lap joint as it is to be joint with a joint stub end. The flange has curved radius at its bore to accommodate a lap joint stub. A lap joint flange is similar in some ways as slip-on flange as a stub end is slipped on the flange having slightly larger radius then the stub end joint. lap joint stub and flange are joint together to make a assembly. Thus lap joint flange allows easy dismantling of system assembly. We manufacture lap joint flange in different sizes and standards.
| DIMENSIONS OF CLASS 300 FLANGES (ANSI B 16.5) (in mm) | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal Pipe Size |
Flange Dia 'O' |
Dia of Bolt Circle 'A' |
Dia of Bolt Holes 'D' |
No. of Holes |
Thk of Flange 'C' |
Diameter at Weld Bevel | Dia of Hub 'E' |
Length Through Hub | Bore 'B' | Dia of R/F R |
Depth of Socket F |
Length of Threading |
||||
| S/O & S/W Y |
W/N Y |
L/J Y |
S/O & S/W B |
L/J B |
||||||||||||
| 1/2'' | 15 | 95.2 | 66.7 | 15.9 | 4 | 14.3 | 21.3 | 38.1 | 22.2 | 52.4 | 22.2 | 22.3 | 22.9 | 34.9 | 9.5 | 15.9 |
| 3/4'' | 20 | 117.5 | 82.5 | 19.0 | 4 | 15.9 | 26.7 | 47.6 | 25.4 | 57.1 | 25.4 | 27.7 | 28.2 | 42.9 | 11.1 | 15.9 |
| 1'' | 25 | 123.8 | 88.9 | 19.0 | 4 | 17.5 | 33.5 | 54.0 | 27.0 | 61.9 | 27.0 | 34.5 | 35.0 | 50.8 | 12.7 | 17.5 |
| 1 ¼'' | 32 | 133.3 | 98.4 | 19.0 | 4 | 19.0 | 42.2 | 63.5 | 27.0 | 65.1 | 27.0 | 43.2 | 43.7 | 63.5 | 14.3 | 20.6 |
| 1 ½'' | 40 | 155.6 | 114.3 | 22.2 | 4 | 20.6 | 48.3 | 69.8 | 30.2 | 68.3 | 30.2 | 49.5 | 50.0 | 73.0 | 15.9 | 22.2 |
| 2'' | 50 | 165.1 | 127.0 | 19.0 | 8 | 22.2 | 60.4 | 84.1 | 33.3 | 69.8 | 33.3 | 62.0 | 62.5 | 92.1 | 17.5 | 25.4 |
| 2 ½'' | 65 | 190.5 | 149.2 | 22.2 | 8 | 25.4 | 73.1 | 100.0 | 38.1 | 76.2 | 38.1 | 74.7 | 75.4 | 104.8 | 19.0 | 28.6 |
| 3'' | 80 | 209.5 | 168.3 | 22.2 | 8 | 28.6 | 88.9 | 117.5 | 42.9 | 79.4 | 42.9 | 90.7 | 91.4 | 127.0 | 20.6 | 30.2 |
| 3 ½'' | 90 | 228.5 | 184.2 | 22.2 | 8 | 30.2 | 101.6 | 133.4 | 44.5 | 81.0 | 44.5 | 103.4 | 104.1 | 140.0 | 20.6 | 31.7 |
| 4'' | 100 | 254.0 | 200.0 | 22.2 | 8 | 31.8 | 114.3 | 146.0 | 47.6 | 85.7 | 47.6 | 116.1 | 116.8 | 157.2 | 23.8 | 33.3 |
| 5'' | 125 | 279.4 | 234.9 | 22.2 | 8 | 34.9 | 141.2 | 177.8 | 50.8 | 98.4 | 50.8 | 143.8 | 144.5 | 185.7 | - | 36.5 |
| 6'' | 150 | 317.5 | 269.9 | 22.2 | 12 | 36.5 | 168.4 | 206.4 | 52.4 | 98.4 | 52.4 | 170.7 | 171.4 | 215.9 | - | 39.7 |
| 8'' | 200 | 381.0 | 330.2 | 25.4 | 12 | 41.3 | 219.2 | 260.3 | 61.9 | 111.1 | 61.9 | 221.5 | 222.2 | 269.9 | - | 44.4 |
| 10'' | 250 | 444.5 | 387.3 | 28.6 | 16 | 47.6 | 273.0 | 320.7 | 66.7 | 117.5 | 95.2 | 276.3 | 277.4 | 323.8 | - | 49.2 |
| 12'' | 300 | 520.7 | 450.8 | 31.7 | 16 | 50.8 | 323.8 | 374.6 | 73.0 | 130.2 | 101.6 | 327.1 | 328.2 | 381.0 | - | 55.6 |
| 14'' | 350 | 584.2 | 514.3 | 31.7 | 20 | 54.0 | 355.6 | 425.4 | 76.2 | 142.9 | 111.1 | 359.1 | 360.2 | 412.7 | - | 57.1 |
| 16'' | 400 | 647.7 | 571.5 | 34.9 | 20 | 57.2 | 406.4 | 482.6 | 82.5 | 146.0 | 120.6 | 410.5 | 411.2 | 469.9 | - | 63.5 |
| 18'' | 450 | 711.2 | 628.5 | 34.9 | 24 | 60.3 | 457.2 | 533.4 | 88.9 | 158.7 | 130.2 | 461.8 | 462.3 | 533.4 | - | 68.3 |
| 20'' | 500 | 774.7 | 685.8 | 34.9 | 24 | 63.5 | 508.0 | 587.4 | 95.2 | 161.9 | 139.7 | 513.1 | 514.3 | 584.2 | - | 73.0 |
| 24'' | 600 | 914.4 | 812.8 | 41.3 | 24 | 69.8 | 609.6 | 701.7 | 106.4 | 168.3 | 152.4 | 615.9 | 615.9 | 692.1 | - | 82.5 |
Note : Thickness 'C' is inclusive of Raised Face Thickness of 1.65 MM. For Class 300
