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Slip on flange dimensions are covered in ASME B16.5 – which covers Pipe Flanges and Flanged Fittings for size NPS ½” to 24” for above NPS 26” to 60” it should be as per ASME B16.47.

During a dimensional inspection of slip on flange, you should check for

  • Outer & Inner Diameter of body
  • Bolt Circle & Bolt Hole Diameter
  • Length of the Hub
  • Straightness and alignment of the bolt hole
slip on flange dimensions

Class 150 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC Machine Bolt Length RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 90 9.6 30 14 34.9 2 60.3 22.2 4 1/2 50 55 5/8 M14 0.8
3/4 20 100 11.2 38 14 42.9 2 69.9 27.7 4 1/2 50 65 5/8 M14 0.9
1 25 110 12.7 49 16 50.8 2 79.4 34.5 4 1/2 55 65 5/8 M14 0.9
1 1/4 32 115 14.3 59 19 63.5 2 88.9 43.2 4 1/2 55 70 5/8 M14 1.4
1 1/2 40 125 15.9 65 21 73 2 98.4 49.5 4 1/2 65 70 5/8 M14 1.4
2 50 150 17.5 78 24 92.1 2 120.7 61.9 4 5/8 70 85 3/4 M16 2.3
2 1/2 65 180 20.7 90 27 104.8 2 139.7 74.6 4 5/8 75 90 3/4 M16 3.2
3 80 190 22.3 108 29 127 2 152.4 90.7 4 5/8 75 90 3/4 M16 3.7
3 1/2 90 215 22.3 122 30 139.7 2 177.8 103.4 8 5/8 75 90 3/4 M16 5
4 100 230 22.3 135 32 157.2 2 190.5 116.1 8 5/8 75 90 3/4 M16 5.9
5 125 255 22.3 164 35 185.7 2 215.9 143.8 8 3/4 85 95 7/8 M20 6.8
6 150 280 23.9 192 38 215.9 2 241.3 170.7 8 3/4 85 100 7/8 M20 8.6
8 200 345 27 246 43 269.9 2 298.5 221.5 8 3/4 90 110 7/8 M20 13.7
10 250 405 28.6 305 48 323.8 2 362 276.2 12 7/8 100 115 1 M24 19.5
12 300 485 30.2 365 54 381 2 431.8 327 12 7/8 100 120 1 M24 29
14 350 535 33.4 400 56 412.8 2 476.3 359.2 12 1 115 135 1 1/8 M27 41
16 400 595 35 457 62 469.9 2 539.8 410.5 16 1 115 135 1 1/8 M27 54
18 450 635 38.1 505 67 533.4 2 577.9 461.8 16 1 1/8 125 145 1 1/4 M30 59
20 500 700 41.3 559 71 584.2 2 635 513.1 20 1 1/8 140 160 1 1/4 M30 75
24 600 815 46.1 663 81 692.2 2 749.3 616 20 1 1/4 150 170 1 3/8 M33 100

Class 300 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC Machine Bolt Length RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 95 12.7 38 21 34.9 2 66.7 22.2 4 1/2 55 65 5/8 M14 1.2
3/4 20 115 14.3 48 24 42.9 2 82.6 27.7 4 5/8 65 75 3/4 M16 1.4
1 25 125 15.9 54 25 50.8 2 88.9 34.5 4 5/8 65 75 3/4 M16 1.4
1 1/4 32 135 17.5 64 25 63.5 2 98.4 43.2 4 5/8 70 85 3/4 M16 1.8
1 1/2 40 155 19.1 70 29 73 2 114.3 49.5 4 3/4 75 90 7/8 M20 2.7
2 50 165 20.7 84 32 92.1 2 127 61.9 8 5/8 75 90 3/4 M16 3.2
2 1/2 65 190 23.9 100 37 104.8 2 149.2 74.6 8 3/4 85 100 7/8 M20 4.6
3 80 210 27 117 41 127 2 168.3 90.7 8 3/4 90 110 7/8 M20 5.9
3 1/2 90 230 28.6 133 43 139.7 2 184.2 103.4 8 3/4 95 110 7/8 M20 7.7
4 100 255 30.2 146 46 157.2 2 200 116.8 8 3/4 95 115 7/8 M20 10
5 125 280 33.4 178 49 185.7 2 235 144.4 8 3/4 110 120 7/8 M20 12.7
6 150 320 35 206 51 215.9 2 269.9 171.4 12 3/4 110 120 7/8 M20 17.7
8 200 380 39.7 260 60 269.9 2 330.2 222.2 12 7/8 120 140 1 M24 26
10 250 445 46.1 321 65 323.8 2 387.4 277.4 16 1 140 160 1 1/8 M27 36
12 300 520 49.3 375 71 381 2 450.8 328.2 16 1 1/8 145 170 1 1/4 M30 52
14 350 585 52.4 425 75 412.8 2 514.4 360.2 20 1 1/8 160 180 1 1/4 M30 75
16 400 650 55.6 483 81 469.9 2 571.5 411.2 20 1 1/4 165 190 1 3/8 M33 86
18 450 710 58.8 533 87 533.4 2 628.6 462.3 24 1 1/4 170 195 1 3/8 M33 113
20 500 775 62 587 94 584.2 2 685.8 514.4 24 1 1/4 185 205 1 3/8 M33 143
24 600 915 68.3 702 105 692.2 2 812.8 616 24 1 1/2 205 230 1 5/8 M39 216
Piping Courses

Class 400 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thickness Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 95 14.3 38 22 34.9 7 66.7 22.2 4 1/2 75 5/8 M14 1.3
3/4 20 115 15.9 48 25 42.9 7 82.6 27.7 4 5/8 90 3/4 M16 1.5
1 25 125 17.5 54 27 50.8 7 88.9 34.5 4 5/8 90 3/4 M16 1.8
1 1/4 32 135 20.7 64 29 63.5 7 98.4 43.2 4 5/8 95 3/4 M16 2.3
1 1/2 40 155 22.3 70 32 73 7 114.3 49.5 4 3/4 110 7/8 M20 3.2
2 50 165 25.4 84 37 92.1 7 127 61.9 8 5/8 110 3/4 M16 4.1
2 1/2 65 190 28.6 100 41 104.8 7 149.2 74.6 8 3/4 120 7/8 M20 5.9
3 80 210 31.8 117 46 127 7 168.3 90.7 8 3/4 125 7/8 M20 7.3
4 100 255 35 146 51 157.2 7 200 116.1 8 7/8 140 1 M24 11.8
5 125 280 38.1 178 54 185.7 7 235 143.8 8 7/8 145 1 M24 14.1
6 150 320 41.3 206 57 215.9 7 269.9 170.7 12 7/8 150 1 M24 20
8 200 380 47.7 260 68 269.9 7 330 221.5 12 1 170 1 1/8 M27 31
10 250 445 54 321 73 323.8 7 387.4 276.2 16 1 1/8 190 1 1/4 M30 42
12 300 520 57.2 375 79 381 7 450.8 327 16 1 1/4 205 1 3/8 M33 59
14 350 585 60.4 425 84 412.8 7 514.4 359.2 20 1 1/4 210 1 3/8 M33 82
16 400 650 63.5 483 94 469.9 7 571.5 410.5 20 1 3/8 220 1 1/2 M36 107
18 450 710 66.7 533 98 533.4 7 628.6 461.8 24 1 3/8 230 1 1/2 M36 130
20 500 775 69.9 587 102 584.2 7 685.8 513.1 24 1 1/2 240 1 3/4 M39 157
24 600 915 76.2 702 114 692.2 7 812.8 616 24 1 3/4 265 1 7/8 M45 232

Class 600 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thickness Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 95 14.3 38 22 34.9 7 66.7 22.2 4 1/2 75 5/8 M14 1.3
3/4 20 115 15.9 48 25 42.9 7 82.6 27.7 4 5/8 90 3/4 M16 1.4
1 25 125 17.5 54 27 50.8 7 88.9 34.5 4 5/8 90 3/4 M16 1.8
1 1/4 32 135 20.7 64 29 63.5 7 98.4 43.2 4 5/8 95 3/4 M16 2.3
1 1/2 40 155 22.3 70 32 73 7 114.3 49.5 4 3/4 110 7/8 M20 3.2
2 50 165 25.4 84 37 92.1 7 127 61.9 8 5/8 110 3/4 M16 4.1
2 1/2 65 190 28.6 100 41 104.8 7 149.2 74.6 8 3/4 120 7/8 M20 5.9
3 80 210 31.8 117 46 127 7 168.3 90.7 8 3/4 125 7/8 M20 7.3
4 100 275 38.1 152 54 157.2 7 215.9 116.1 8 7/8 145 1 M24 16.8
5 125 330 44.5 189 60 185.7 7 266.7 143.8 8 1 165 1 1/8 M27 29
6 150 355 47.7 222 67 215.9 7 292.1 170.7 12 1 170 1 1/8 M27 36
8 200 420 55.6 273 76 269.9 7 349.2 221.5 12 1 1/8 190 1 1/4 M30 52
10 250 510 63.5 343 86 323.8 7 431.8 276.2 16 1 1/4 215 1 3/8 M33 77
12 300 560 66.7 400 92 381 7 489 327 20 1 1/4 220 1 3/8 M33 91
14 350 605 69.9 432 94 412.8 7 527 359.2 20 1 3/8 235 1 1/2 M36 105
16 400 685 76.2 495 106 469.9 7 603.2 410.5 20 1 1/2 255 1 5/8 M39 150
18 450 745 82.6 546 117 533.4 7 654 461.8 20 1 5/8 275 1 3/4 M42 182
20 500 815 88.9 610 127 584.2 7 723.9 513.1 24 1 5/8 285 1 3/4 M42 232
24 600 940 101.6 718 140 692.2 7 838.2 616 24 1 7/8 330 2 M48 332

Class 900 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thickness Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 120 22.3 38 32 34.9 7 82.6 22.2 4 3/4 110 7/8 M20 1.8
3/4 20 130 25.4 44 35 42.9 7 88.9 27.7 4 3/4 115 7/8 M20 2.3
1 25 150 28.6 52 41 50.8 7 101.6 34.5 4 7/8 125 1 M24 3.6
1 1/4 32 160 28.6 64 41 63.5 7 111.1 43.2 4 7/8 125 1 M24 4.1
1 1/2 40 180 31.8 70 44 73 7 123.8 49.5 4 1 140 1 1/8 M27 5.5
2 50 215 38.1 105 57 92.1 7 165.1 61.9 8 7/8 145 1 M24 11.5
2 1/2 65 245 41.3 124 64 104.8 7 190.5 74.6 8 1 160 1 1/8 M27 16.5
3 80 240 38.1 127 54 127 7 190.5 90.7 8 7/8 145 1 M24 12
4 100 290 44.5 159 70 157.2 7 235 116.1 8 1 1/8 170 1 1/4 M30 24
5 125 350 50.8 190 79 185.7 7 279.4 143.8 8 1 1/4 190 1 3/8 M33 38
6 150 380 55.6 235 86 215.9 7 317.5 170.7 12 1 1/8 190 1 1/4 M30 50
8 200 470 63.5 298 102 269.9 7 393.7 221.5 12 1 3/8 220 1 1/2 M36 78
10 250 545 69.9 368 108 323.8 7 469.9 276.2 16 1 3/8 235 1 1/2 M36 112
12 300 610 79.4 419 117 381 7 533.4 327 20 1 3/8 255 1 1/2 M36 148
14 350 640 85.8 451 130 412.8 7 558.8 359.2 20 1 1/2 275 1 5/8 M39 182
16 400 705 88.9 508 133 469.9 7 616 410.5 20 1 5/8 285 1 3/4 M42 193
18 450 785 101.6 565 152 533.4 7 685.8 461.8 20 1 7/8 325 2 M48 258
20 500 855 108 622 159 584.2 7 749.3 513.1 20 2 350 2 1/8 M52 317
24 600 1040 139.7 749 203 692.2 7 901.7 616 20 2 1/2 440 2 5/8 M64 608

Class 1500 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thickness Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 120 22.3 38 32 34.9 7 82.6 22.2 4 3/4 110 7/8 M20 1.8
3/4 20 130 25.4 44 35 42.9 7 88.9 27.7 4 3/4 115 7/8 M20 2.3
1 25 150 28.6 52 41 50.8 7 101.6 34.5 4 7/8 125 1 M24 3.7
1 1/4 32 160 28.6 64 41 63.5 7 111.1 43.2 4 7/8 125 1 M24 4.1
1 1/2 40 180 31.8 70 44 73 7 123.8 49.5 4 1 140 1 1/8 M27 5.5
2 50 215 38.1 105 57 92.1 7 165.1 61.9 8 7/8 145 1 M24 9.8
2 1/2 65 245 41.3 124 64 104.8 7 190.5 74.6 8 1 160 1 1/8 M27 16.4

Disclaimer –  Please check with ASME B16.5 Before using.