Lap Joint Flange

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$USD 30 $USD 28

Size Range: 1/2" - 24" / DN15 - DN600 Pressure Rating: Class 150, 300, 600, 900, 1500, 2500 Standard : ASME B16.5

SKU: ZZ106 Category:

Classification of Forged Steel Flange

Flange is one of the most commonly used connection part in a pipeline system and valves or machine part. We major in producing the forged steel flange, which should be applied into the high pressure and temperature working environment. There are six types, welding neck, blind, slip on , socket weld , threaded and lap joint flange. 

What is the Lap Joint Flange

Lap joint flange is including two-parts: stub end and LAPJ flange. It’s very similar to a slip on flange, they both have a flat smooth face. The lap joint flange is usually used in places that require frequent disassembly for inspection. With the help of stub end , also known as collar some times, lap joint flange perform well in this situation.

Lap Joint Flange

The flange part and the stub end part are usually purchas respectively. So if you need them all in one together, please mention it in your description and unit of the items.

ASME B16.5 Lap Joint Flange Dimension

ASME B16.5 is a standard for pipe flanges and flange fittings, developed by the American Society of Mechanical Engineers . This standard specifies in detail the design, dimensions, material selection, manufacturing process, inspection methods, and marking requirements.

Dimension of ASME B16.5 blind flanges are in 1/2″ to 24″ nominal sizes. The pressure of Class 150#, 300#, 400#, 600#, 900#, 1500#, and 2500# .

 ASEM B16.9 Stub End Dimension

ASME B16.9 is one of the main manufacturing standards for stainless steel stub end. This standard specifies key parameters such as dimensions, tolerances, material requirements, and inspection methods for stub end. In specifications, the size range of stub end is from 1/2 “to 24”. It can meet the connection requirements of pipes with different diameters.

Lap Joint Flange End

DN NPS OD F R G
Max. Min. Long Type Short Type A Bmax
15 1/2 22.8 20.5 76 51 3 0.8 35
20 3/4 28.1 25.9 76 51 3 0.8 43
25 1 35.0 32.6 102 51 3 0.8 51
32 11/4 43.6 41.4 102 51 5 0.8 64
40 11/2 49.9 47.5 102 51 6 0.8 73
50 2 62.4 59.5 152 64 8 0.8 92
65 21/2 75.3 72.2 152 64 8 0.8 105
80 3 91.3 88.1 152 64 10 0.8 127
90 31/2 104.0 100.8 152 76 10 0.8 140
100 4 116.7 113.5 152 76 11 0.8 157
125 5 144.3 140.5 203 76 11 1.6 186
150 6 171.3 167.5 203 89 13 1.6 216
200 8 222.1 218.3 203 102 13 1.6 270
250 10 277.2 272.3 254 127 13 1.6 324
300 12 328.0 323.1 254 152 13 1.6 381
350 14 359.9 354.8 305 152 13 1.6 413
400 16 411.0 405.6 305 152 13 1.6 470
450 18 462.0 456.0 305 152 13 1.6 533
500 20 514.0 507.0 305 152 13 1.6 584
550 22 565.0 558.0 305 152 13 1.6 641
600 24 616.0 609.0 305 152 13 1.6 692

Features and Advantages

Convenient Connection

Good Sealing Performance

Strong Adaptability

Application and Precaution

ASME B16.5 lap joint flange is widely apply to pipeline systems in industries such as petroleum, chemical, and natural gas. Especially in situations that require frequent disassembly and maintenance, such as oil refineries, chemical plants, and natural gas transmission pipelines.

Choose the Appropriate Material

Pay Attention to Size Matching

Adhere to Manufacturing Standards

ASME B16.5 lap joint flange is an important type of pipeline connector, widely used in industries. Understanding its definition, classification, materials, specifications, manufacturing standards, and application precautions is of great significance for ensuring the safe operation of pipeline systems.

Specification of Forged Steel Flanges

Size Range 1/2″ – 24″ / DN15 – DN600
Pressure Rating Class 150, 300, 600, 900, 1500, 2500
Standard ASME B16.5, EN1092-1
Carbon Steel ASTM A105 / A105N
Low Temp Carbon Steel ASTM A350 LF2 / LF3
Pipeline Steel ASTM A694 F42 / 46 / 56 / 60 / 65
Alloy Steel ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Stainless Steel ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L
Duplex Stainless Steel ASTM A182 F51, F53, F44

ASME B16.5 Lap Joint Flange Dimension

Class 150 lb
Nominal
Pipe Size		 A B C D R F H I J Weight
mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 88.90 22.90 11.20 15.70 3.000 30.20 4 15.70 60.45 0.38
3/4 26.70 98.60 28.2 12.70 15.70 3.000 38.10 4 15.70 69.85 0.55
1 33.40 108.0 35. 10 14.20 17.50 3.000 49.30 4 15.70 79.25 0.76
11/4 42.20 117.3 43.70 15.70 20.60 4.800 58.70 4 15.70 88.90 1.01
11/2 48.30 127.0 50.00 17.50 22.40 6.400 65.00 4 15.70 98.60 1.30
2 60.30 152.4 62.50 19. 10 25.40 7.900 77.70 4 19.10 120.7 2.03
21/2 73.00 177.8 75.40 22.40 28.40 7.900 90.40 4 19.10 139.7 3.25
3 88.90 190.5 91.40 23.90 30.20 9.700 108.0 4 19.10 152.4 3.81
31/2 101.6 215.9 104.1 23.90 31.75 9.700 122.2 8 19.10 177.8 4.76
4 114.3 228.6 116.8 23.90 33.30 11.20 134.9 8 19.10 190.5 5.25
5 141.3 254.0 114.5 23.90 36.60 11.20 163.6 8 22.40 215.9 6.02
6 168.3 279.4 171.5 25.40 39.6 12.70 192.0 8 22.40 241.3 7.40
8 219. 1 342.9 222.3 28.40 44.50 12.70 246. 1 8 22.40 298.5 12.1
10 273.0 406.4 277.4 30.20 49.30 12.70 304.8 12 25.40 362.0 16.4
12 323.8 482.6 328.2 31.75 55.60 12.70 365.3 12 25.40 431.8 26.1
14 355.6 533.4 360.2 35. 10 79.25 12.70 400. 1 12 28.40 476.3 34.5
16 406.4 596.9 411.2 36.60 87.40 12.70 457.2 16 28.4 539.8 44.6
18 457.2 635.0 462.3 39.60 96.80 12.70 505.0 16 31.75 577.9 48.7
20 508.0 698.5 514.4 42.90 103.1 12.70 558.8 20 31.75 635.0 61.6
24 609.6 812.8 616.0 47.80 111.3 12.70 663.4 20 35.10 749.3 86.6
Class 300 lb
Nominal
Pipe Size		 A B C D R F H I J Weight
mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 95.20 22.90 14.20 22.30 3.000 38.10 4 15.70 66.55 0.62
3/4 26.70 117.3 28.20 15.70 25.40 3.000 47.70 4 19.00 82.50 1.10
1 33.40 123.9 35.10 17.50 26.90 3.000 53.80 4 19.0 88.90 1.33
11/4 42.20 133.3 43.70 19.00 26.90 4.800 63.50 4 19.00 98.50 1.65
11/2 48.30 155.4 50.00 20.60 30.20 6.400 69.85 4 22.30 114.3 2.44
2 60.30 165.1 62.50 22.30 33.20 7.900 84.00 8 19.10 127.0 2.83
21/2 73.00 190.5 75.40 25.40 38.10 7.900 100.0 8 22.3 149.3 4.25
3 88.90 209.5 91.40 28.40 42.90 9.700 117.3 8 22.30 168.1 5.78
31/2 101.6 228.6 104.1 30.20 44.40 9.700 133.3 8 22.30 184.1 7.27
4 114.3 254.0 116.8 31.70 47.70 11.20 146.0 8 22.30 200.1 9.55
5 141.3 279.4 114.5 35.0 50.80 11.20 177.8 8 22.30 234.9 12.2
6 168.3 317.5 171.5 36.50 52.30 12.70 206.2 12 22.30 269.7 15.5
8 219.1 381.0 222.3 41. 10 61.90 12.70 260.3 12 25.40 330.2 24.1
10 273.0 444.5 277.4 47.70 95.20 12.70 320.5 16 28.40 387.3 34.4
12 323.8 520.7 328.2 50.80 101.6 12.70 374.6 16 31.70 450.8 50.4
14 355.6 584.2 360.2 53.80 111.2 12.70 425.4 20 31.70 514.3 70.9
16 406.4 647.7 411.2 57. 15 120.6 12.70 482.6 20 35.00 571.5 89.5
18 457.2 711.2 462.3 60.45 130.0 12.70 533.4 24 35.00 628.6 111
20 508.0 774.7 514.4 63.50 139.7 12.70 587.2 24 35.0 685.8 137
24 609.6 914.4 616.0 69.8 152.4 12.70 701.5 24 41.10 812.8 204
Class 400 lb
Nominal
Pipe Size		 A B C D R F H I J Weight
mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 95.30 22.90 14.20 22.40 3.000 38.10 4 15.70 66.55 0.72
3/4 26.70 117.3 28.20 15.70 25.40 3.000 47.80 4 19. 10 82.60 1.25
1 33.40 124.0 35.10 17.50 26.90 3.000 53.80 4 19. 10 88.90 1.50
11/4 42.20 133.4 43.70 20.60 28.40 4.800 63.50 4 19. 10 98.60 2.00
11/2 48.30 155.4 50.00 22.40 31.75 6.400 69.85 4 22.40 114.3 2.92
2 60.30 165.1 62.50 25.40 36.60 7.900 84.10 8 19. 10 127.0 3.55
21/2 73.00 190.5 75.40 28.40 41.10 7.900 100.1 8 22.40 149.4 5.23
3 88.90 209.6 91.4 31.75 46.00 9.700 117.3 8 22.40 168. 1 6.95
31/2 101.6 228.6 104.1 35.10 49.30 9.700 133.4 8 25.40 184.2 8.78
4 114.3 254.0 116.8 35.10 50.80 11.20 146.1 8 25.40 200.2 10.9
5 141.3 279.4 114.5 38.10 53.80 11.20 177.8 8 25.40 235.0 13.7
6 168.3 317.5 171.5 41.10 57.15 12.70 206.2 12 25.40 269.7 18.0
8 219.1 381.0 222.3 47.80 68.30 12.70 260.4 12 28.40 330.2 28.3
10 273.0 444.5 277.4 53.80 101.6 12.70 320.5 16 31.75 387.4 38.8
12 323.8 520.7 328.2 57.15 108.0 12.70 374.7 16 35. 10 450.9 56.6
14 355.6 584.2 360.2 60.45 117.3 12.70 425.5 20 35. 10 514.4 78.6
16 406.4 647.7 411.2 63.50 127.0 12.70 482.6 20 38. 10 571.5 100
18 457.2 711.2 462.3 66.55 136.7 12.70 533.4 24 38. 10 628.7 122
20 508.0 774.7 514.4 69.85 146.1 12.70 587.2 24 41. 10 685.8 145
24 609.6 914.4 616.0 76.20 158.8 12.70 701.5 24 47.80 812.8 217
Class 400 lb
Nominal
Pipe Size		 A B C D R F H I J Weight
mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 95.30 22.90 14.20 22.40 3.000 38.10 4 15.70 66.55 0.72
3/4 26.70 117.3 28.20 15.70 25.40 3.000 47.80 4 19. 10 82.60 1.25
1 33.40 124.0 35.10 17.50 26.90 3.000 53.8 4 19. 10 88.90 1.50
11/4 42.20 133.4 43.70 20.60 28.40 4.800 63.50 4 19. 10 98.60 2.00
11/2 48.30 155.4 50.00 22.40 31.75 6.400 69.85 4 22.40 114.3 2.92
2 60.30 165.1 62.50 25.40 36.60 7.900 84.1 8 19. 10 127.0 3.55
21/2 73.00 190.5 75.40 28.40 41. 10 7.900 100.1 8 22.40 149.4 5.23
3 88.90 209.6 91.40 31.75 46.00 9.700 117.3 8 22.40 168.1 6.95
31/2 101.6 228.6 104.1 35.10 49.30 9.700 133.4 8 25.40 184.2 8.78
4 114.3 273.1 116.8 38.10 53.80 11.20 152.4 8 25.40 215.9 14.4
5 141.3 330.2 114.5 44.50 60.45 11.20 189.0 8 28.40 266.7 24.3
6 168.3 355.6 171.5 47.80 66.55 12.70 222.3 12 28.40 292.1 28.5
8 219.1 419.1 222.3 55.60 76.20 12.70 273.1 12 31.75 349.3 43.1
10 273.0 508.0 277.4 63.50 111.3 12.70 342.9 16 35. 10 431.8 70.5
12 323.8 558.8 328.2 66.55 117.3 12.70 400.1 20 35. 10 489.0 86.1
14 355.6 603.3 360.2 69.85 127.0 12.70 431.8 20 38. 10 527.1 100
16 406.4 685.8 411.2 76.20 139.7 12.70 495.3 20 41. 10 603.3 145
18 457.2 743.0 462.3 82.60 152.4 12.70 546.1 20 44.50 654.1 177
20 508.0 812.8 514.4 88.90 165.1 12.70 609.6 24 44.50 723.9 225
24 609.6 939.8 616.0 101.6 184.2 12.70 717.6 24 50.80 838.2 318
Class 900 lb
Nominal
Pipe Size		 A B C D R F H I J Weight
mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 120.6 22.90 22.30 31.70 3.000 38.10 4 22.30 82.50 1.71
3/4 26.70 130.0 28.20 25.40 35.00 3.000 44.40 4 22.30 88.90 2.30
1 33.40 149.3 35.10 28.40 41.10 3.000 52.30 4 25.40 101.6 3.40
11/4 42.20 158.7 43.70 28.40 41.10 4.800 63.50 4 25.40 111.2 3.85
11/2 48.30 177.8 50.00 31.70 44.40 6.400 69.85 4 28.40 123.9 5.28
2 60.30 215.9 62.50 38.10 57.15 7.900 104.6 8 25.40 165. 1 9.78
21/2 73.00 244.3 75.40 41.10 63.50 7.900 123.9 8 28.40 190.5 13.6
3 88.90 241.3 91.40 38.10 53.80 9.700 127.0 8 25.40 190.5 11.3
4 114.3 292.1 116.8 44.40 69.85 11.20 158.7 8 31.70 234.9 19.2
5 141.3 349.2 114.5 50.80 79.25 11.20 190.5 8 35.00 279.4 31.20
6 168.3 381.0 171.5 55.60 85.80 12.70 234.9 12 31.70 317.5 40.50
8 219.1 469.9 222.3 63.50 114.3 12.70 298.4 12 38.10 393.7 71.5
10 273.0 546.1 277.4 69.85 127.0 12.70 368.3 16 38.10 469.9 104
12 323.8 609.6 328.2 79.25 142.7 12.70 419.1 20 38.10 533.4 139
14 355.6 641.3 360.2 85.80 155.4 12.70 450.8 20 41.10 558.8 161
16 406.4 704.8 411.2 88.90 165.1 12.70 508.0 20 44.40 615.9 194
18 457.2 787.4 462.3 101.6 190.5 12.70 565.1 20 50.80 685.8 267
20 508.0 857.2 514.4 107.9 209.5 12.70 622.3 20 53.80 749.3 334
24 609.6 1041.4 616.0 139.7 266.7 12.70 749.3 20 66.55 901.7 618
Class 1500 lb
Nominal
Pipe Size		 A B C D R F H I J Weight
mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 120.6 22.90 22.30 31.70 3.000 38.10 4 22.30 82.50 1.71
3/4 26.70 130.0 28.20 25.40 35.00 3.000 44.40 4 22.30 88.90 2.30
1 33.40 149.3 35. 10 28.40 41.10 3.000 52.30 4 25.40 101.6 3.40
11/4 42.20 158.7 43.70 28.40 41.10 4.800 63.50 4 25.40 111.2 3.85
11/2 48.30 177.8 50.00 31.70 44.40 6.400 69.85 4 28.40 123.9 5.28
2 60.30 215.9 62.50 38.10 57.15 7.900 104.6 8 25.40 165.1 9.78
21/2 73.00 244.3 75.40 41.10 63.50 7.900 123.9 8 28.40 190.5 13.6
3 88.90 266.7 91.40 47.70 73.15 9.700 133.3 8 31.70 203.2 17.8
4 114.3 311.1 116.8 53.80 90.40 11.20 162.0 8 35.00 241.3 27.5
5 141.3 374.6 114.5 73.15 104.60 11.20 196.8 8 41.10 292.1 51.5
6 168.3 399.7 171.5 82.50 119. 1 12.70 228.6 12 38.10 317.5 62.0
8 219. 1 482.6 222.3 91.90 142.7 12.70 292.1 12 44.40 393.7 105
10 273.0 584.2 277.4 107.9 177.8 12.70 368.3 12 50.80 482.6 179
12 323.8 673.1 328.2 123.9 218.9 12.70 450.8 16 53.80 571.5 269
14 355.6 749.3 360.2 133.3 241.3 12.70 495.3 16 60.45 635.0 365
16 406.4 825.5 411.2 146.0 260.3 12.70 552.4 16 66.55 704.8 459
18 457.2 914.4 462.3 162.0 276.3 12.70 596.9 16 73.15 774.7 598
20 508.0 984.2 514.4 177.8 292.1 12.70 641.3 16 79.25 831.8 712
24 609.6 1168.4 616.0 203.2 330.2 12.70 762.0 16 91.90 990.6 1090
Class 2500 lb
Nominal
Pipe Size		 A B C D R F H I J Weight
mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 133.4 22.90 30.20 39.60 3.000 42.90 4 22.40 88.90 2.92
3/4 26.70 139.7 28.20 31.75 42.90 3.000 50.80 4 22.40 95.30 3.40
1 33.40 158.8 35. 10 35.10 47.80 3.000 57. 15 4 25.40 108.0 4.77
11/4 42.20 184.2 43.70 38.10 52.30 4.800 73. 15 4 28.40 130.0 7.08
11/2 48.30 203.2 50.00 44.50 60.45 6.400 79.25 4 31.75 146.1 9.93
2 60.30 235.0 62.50 50.80 69.85 7.900 95.30 8 28.40 171.5 14.7
21/2 73.00 266.7 75.40 57.15 79.25 7.900 114.3 8 31.75 196.9 21.3
3 88.90 304.8 91.40 66.55 91.90 9.700 133.4 8 35.10 228.6 32.3
4 114.3 355.6 116.8 76.20 108.0 11.20 165.1 8 41.10 273.1 52.5
5 141.3 419.1 114.5 91.90 130.0 11.20 203.2 8 47.80 323.9 82.6
6 168.3 482.6 171.5 4.250
108.0		 152.4 12.70 235.0 8 53.80 368.3 127
8 219. 1 552.5 222.3 5.000
127.0		 177.8 12.70 304.8 12 53.80 438.2 186
10 273.0 673.1 277.4 165.1 228.6 12.70 374.7 12 66.55 539.8 352
12 323.8 762.0 328.2 184.2 254.0 12.70 441.5 12 73.15 619.3 501

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