ASME/ANSI B16.5 300 Class Lap Joint Flange/Standards, Dimensions & Weight

Lap Joint Flanges, also known as Loose flanges, are utilized in piping systems where lapped pipes or lap joint stub ends are fitted. These items come with a higher initial cost when compared to welding neck flanges, but their combined cost is only approximately one-third higher. Their pressure-holding ability is similar to slip-on flanges and their fatigue life is much less than that of welding neck flanges.heir ability to swivel flanges and align bolt holes considerably simplifies the erection of large diameter or rigid piping. Lap Joint flanges have some unique benefits. The ability to swivel around the pipe enables the opposing flange bolt holes to be lined up easily. Furthermore, the lack of contact with fluid in the pipe often permits the use of inexpensive carbon steel flanges with corrosion-resistant pipes. In systems that corrode or erode quickly, these flanges can be salvaged for reuse.

  • Our company is a manufacturer of ASME/ANSI B16.5 300LB Lap Joint Flange, which is precisely engineered in accordance with international quality standards. For detailed dimensions of 300 Class Lap Joint flange, kindly check the table below. Also, you can download the datasheet.
300 Class Lap Joint Flange Drawing ASME/ANSI B16.5
Product Lap Joint Flange
Pressure Rating 300 lb, 300 Class
Dimensional Specification ASME/ANSI B16.5
Size 1/2″ to 24″
Surface Treatment Anti-rust Oil, Paint, Zinc, Hot Dipped Galvanized
Grades 304, 304L, 316L, 321, 347, 904L, Duplex, Carbon Steel, Nickel Alloys
Test Certificates As per EN 10204 3.1
Inspection Videos, Pictures, Inspection Report with Goods
Pipe Normal Diam. O.D. Flange Thk. Of Flange Min Diam.
of
Hub
Diameter of Raised Face Length Hub.Y Bore Corner
Radius
of Bore
Diam.
of Bolt
Circle
Diam.
of Bolt
Holes
Number
of Bolts
Diam. of
Bolts
(inch)
Approx. Weight
inch dn O C X G Y B R BC BH BN BD KG/PCS LB/PCS
1/2″ 15 95.5 14.2 38.1 35.1 22.4 22.9 3 66.5 15.7 4 1/2″ 0.7 1.5
3/4″ 20 117. 5 15.7 47.8 42.9 25.4 28.2 3 82.6 19.1 4 5/8″ 1.2 2.6
1″ 25 124. 0 17.5 53.8 50.8 26.9 35.1 3 88.9 19.1 4 5/8″ 1.4 3.1
1-1/4″ 32 133. 5 19.1 63.5 63.5 26.9 43.7 4.8 98.6 19.1 4 5/8″ 1.8 4
1-1/2″ 40 155. 5 20.6 69.9 73.2 30.2 50 6.4 114.3 22.4 4 5/8″ 2.7 6
2″ 50 165. 0 22.4 84.1 91.9 33.3 62.5 7.9 127 19.1 8 5/8″ 3.2 7
2-1/2″ 65 190. 5 25.4 100.1 104.6 38.1 75.4 7.9 149.4 22.4 8 3/4″ 4.5 9.9
3″ 80 209. 5 28.4 117.3 127 42.9 91.4 9.7 168.1 22.4 8 3/4″ 5.9 13
3-1/2″ 90 228. 5 30.2 133.4 139.7 44.5 104. 1 9.7 184.2 22.4 8 3/4″ 7.5 16.5
4″ 100 254. 0 31.8 146.1 157.2 47.8 116. 8 11.2 200.2 22.4 8 3/4″ 10 22
5″ 125 279. 5 35.1 177.8 185.7 50.8 144. 5 11.2 235 22.4 8 3/4″ 12.5 27.5
6″ 150 317. 5 36.6 206.2 215.9 52.3 171. 5 12.7 269.7 22.4 12 3/4″ 16.5 36.4
8″ 200 381. 0 41.1 260.4 269.7 62 222. 3 12.7 330.2 25.4 12 7/8″ 25.5 56
10″ 250 444. 5 47.8 320.5 323.9 95.3 277. 4 12.7 387.4 28.4 16 1″ 35 77
12″ 300 520. 5 50.8 374.7 381 101. 6 328. 2 12.7 450.9 31.8 16 1 1/8″ 62 137
14″ 350 584. 0 53.8 425.5 412.8 111. 3 360. 2 12.7 514..4 31.8 20 1 1/8″ 86 190
16″ 400 647. 5 57.2 482.6 469.9 120. 7 411. 2 12.7 571.5 35.1 20 1 1/4″ 113 249
18″ 450 711. 0 60.5 533.4 533.4 130. 0 462. 3 12.7 628.7 35.1 24 1 1/4″ 134 295
20″ 500 774. 5 63.5 587.2 584.2 139. 7 514. 4 12.7 685.8 35.1 24 1 1/4″ 167 368
24″ 600 914. 5 69.9 701.5 692.2 152. 4 616. 0 12.7 812.8 41.1 24 1 1/2″ 240 549