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Stainless Lap-Joint Flange

A stainless steel lap joint flange, compliant with ASME B16.5 standard, is a versatile and efficient choice for systems requiring frequent disassembly or where alignment ease is important. While not as strong as other stainless steel flange types, the flexibility, reusability, and cost-effectiveness of stainless steel lap-joint flange make it ideal for many industrial applications, especially where maintenance and inspection are regular requirements.

Catalogue
Stainless steel lap joint flange, meeting ASME B16.5 standard, available in 304 and 316L material.

Understanding Essential Dimensions for Lap Joint Flanges

Looking for precise stainless steel lap joint flange dimensions? S&S Stainless International offers a detailed dimension guide for ASME B16.5 stainless steel lap joint flanges, covering sizes from DN15 to DN600 and various pressure classes. These flanges are designed to be used with stub ends, allowing easy alignment and disassembly—ideal for systems requiring frequent maintenance. Engineered with accuracy and manufactured to meet ASME standards, our lap joint flanges ensure proper fit, corrosion resistance, and dependable performance across a wide range of industrial piping applications.

Product Specification

ASME B16.5
Class 150-600

ASME B16.5 stainless steel lap joint flange dimension chart, covering pressure classes from 150 to 600.

ASME B16.5 Class 150

Nominal Diameter Pipe Diameter O.D.of Flange Diameter of Raised Face Diameter of Bolt Holes Circle Diameter of Bolt Holes Numbers of Bolt Holes Diameter of Bolt Holes(inch) Flange Thickness Hub Diameter Through Hub Length (H)
DN NPS ID D G, R K L B1-B4 A H1 H2 H3
15 ½’’ 21.3 90 35 60.5 16 4 M14 11.5 30 48 16 16
20 ¾’’ 26.9 100 43 70 16 4 M14 13 38 52 16 16
25 1’’ 33.7 110 51 79.5 16 4 M14 14.5 49 56 17 17
32 1 ¼’’ 42.4 120 63.5 89 16 4 M14 16 59 57 21 21
40 1 ½’’ 48.3 130 73 98.5 16 4 M14 17.5 65 62 22 22
50 2’’ 60.3 150 92 120.5 18 4 M16 19.5 78 64 25 25
65 2 ½’’ 76.1 180 105 139.5 18 4 M16 22.5 90 70 29 29
80 3’’ 88.9 190 127 152.5 18 4 M16 24 108 70 30 30
90 3 ½’’ 101.6 216 140 178 18 8 M20 24 122 71 – 32
100 4’’ 114.3 230 157.5 190.5 18 8 M20 24 135 76 33 33
125 5’’ 139.7 255 186 216 22 8 M20 24 164 89 36 36
150 6’’ 168.3 280 216 241.5 22 8 M20 25.5 192 89 40 40
200 8’’ 219.1 345 270 298.5 22 8 M20 29 246 102 44 45
250 10’’ 273 405 324 362 26 12 M24 30.5 305 102 49 49
300 12’’ 323.9 485 381 432 26 12 M24 32 365 114 56 56
350 14’’ 355.6 535 413 476 29.5 12 M27 35 400 127 57 79
400 16’’ 406.4 600 470 540 29.5 16 M27 37 457 127 64 87
450 18’’ 457 635 533.5 578 32.5 16 M30 40 505 140 68 97
500 20’’ 508 700 584 635 32.5 20 M30 43 559 145 73 103
550 22’’ 559 750 641 692 35.5 20 M33 46 610 149 – –
600 24’’ 610 816 692 749.5 35.5 20 M33 48 664 152 83 111

ASME B16.5 Class 300

Nominal Diameter Pipe Diameter O.D. of Flange Diameter ofRaised Face Diameter of Bolt Holes Circle Diameter ofBolt Holes Numbers ofBoltHoles Diameter of Bolt Holes(inch) Flange Thickness Hub Diameter Through Hub Length
DN NPS ID D G, R K L B1-B4 A H1 H2 H3
15 ½’’ 21.3 95 35 66.5 16 4 M14 14.5 38 52 22 22
20 ¾’’ 26.9 120 43 82.5 18 4 M16 16 48 57 25 25
25 1’’ 33.7 125 51 89 18 4 M16 17.5 54 62 27 27
32 1 ¼’’ 42.4 135 63.5 98.5 18 4 M16 19.5 64 65 27 27
40 1 ½’’ 48.3 155 73 114.5 22 4 M20 21 70 68 30 30
50 2’’ 60.3 165 92 127 18 8 M16 22.5 84 70 33 33
65 2 ½’’ 76.1 190 105 149 22 8 M20 25.5 100 76 38 38
80 3’’ 88.9 210 127 168.5 22 8 M20 29 118 79 43 43
90 3 ½’’ 101.6 229 140 184 22 8 M20 30 140 81 45 45
100 4’’ 114.3 255 157.5 200 22 8 M20 32 146 86 48 48
125 5’’ 139.7 280 186 235 22 8 M20 35 178 98 51 51
150 6’’ 168.3 320 216 270 22 12 M20 37 206 98 52 52
200 8’’ 219.1 380 270 330 26 12 M24 41.5 260 111 62 62
250 10’’ 273 445 324 387.5 29.5 16 M27 48 321 117 67 95
300 12’’ 323.9 520 381 451 32.5 16 M30 51 275 130 73 102
350 14’’ 355.6 585 413 514.5 32.5 20 M30 54 426 143 76 111
400 16’’ 406.4 650 470 571.5 32.5 20 M33 57.5 483 146 83 121
450 18’’ 457 710 533.5 628.5 32.5 24 M33 60.5 533 159 89 130
500 20’’ 508 775 584 686 32.5 24 M33 63.5 587 162 95 140
550 22’’ 559 840 641 743 42 24 M39 66.5 640 165 – –
600 24’’ 610 915 692 813 42 24 M39 70 702 168 104 152

ASME B16.5 Class 600

Nominal Diameter Pipe Diameter O.D. of Flange Diameter of Raised Face Diameter of Bolt Holes Circle Diameter of Bolt Holes Numbers of Bolt Holes Diameter of Bolt Holes(inch) Flange Thickness Hub Diameter Through Hub Length
DN NPS ID D G, R K L B1-B4 A H1 H2 H3
15 ½’’ 21.3 95 35 66.5 16 4 M14 14.5 38 52 22 22
20 ¾’’ 26.9 120 43 82.5 18 4 M16 16 48 57 25 25
25 1’’ 33.7 125 51 89 18 4 M16 17.5 54 62 27 27
32 1 ¼’’ 42.4 135 63.5 98.5 18 4 M16 21 64 67 29 29
40 1 ½’’ 48.3 155 73 114.5 22 4 M20 22.5 70 70 32 32
50 2’’ 60.3 165 92 127 18 8 M16 22.5 84 73 37 37
65 2 ½’’ 76.1 190 105 149 22 8 M20 29 100 79 41 41
80 3’’ 88.9 210 127 168.5 22 8 M20 32 117 83 46 46
90 3 ½’’ 101.6 229 140 184 26 8 M24 35 133 86 49 49
100 4’’ 114.3 275 157.5 216 26 8 M24 38.5 152 102 54 54
125 5’’ 139.7 330 186 267 29.5 8 M27 44.5 189 114 60 60
150 6’’ 168.3 355 216 292 29.5 12 M27 48 222 117 67 67
200 8’’ 219.1 420 270 349 32.5 12 M30 55.5 273 133 76 76
250 10’’ 273 510 324 432 35.5 16 M33 63.5 343 152 86 111
300 12’’ 323.9 560 381 489 35.5 20 M33 67 400 156 92 117
350 14’’ 355.6 605 413 527 39 20 M36 70 432 165 94 127
400 16’’ 406.4 685 470 603 42 20 M39 76.5 495 178 106 140
450 18’’ 457 745 533.5 654 45 20 M42 83 546 184 117 152
500 20’’ 508 815 584 724 45 24 M42 89 610 190 127 165
550 22’’ 559 870 641 778 48 24 M45 95 665 197 – –
600 24’’ 610 940 692 838 51 24 M48 102 718 203 140 184

Navigating Our Stainless Steel Lap Joint Flange Dimension Table

This table provides detailed measurements for selecting the correct stainless steel lap joint flange. You will find dimensions for:

  • Nominal Pipe Size (NPS): The standard pipe size for which the flange is designed.
  • Outside Diameter (OD) of Flanges: The total diameter of the flange itself.
  • Raised Face (RF) Height: The height of the raised portion of the flange sealing surface (if applicable).
  • Bolt Circle Diameter (BCD): The diameter on which the centers of the bolt holes lie.
  • Number of Bolts & Bolt Hole Diameter: Specifies the quantity and size of bolts required for connection.
  • Flange Thickness (T): The overall thickness of the flange.
  • Hub Diameter: The diameter of the cylindrical or tapered projection from the flange.
  • Through Hub Length: The length of the hub from the flange face to its end, indicating how far the pipe will extend into the flange.

Carefully match these dimensions to your project’s requirements to ensure a secure and leak-proof connection.

Engineered to Precision: Compliant with ASME B16.5 Standards

S&S Stainless International supplies high-quality stainless steel lap joint flanges manufactured in strict compliance with ASME B16.5 standards for pipe flanges and flanged fittings. Each lap joint flange is precision-crafted to meet industry specifications for dimensions, tolerances, and structural integrity. Designed for use with stub ends, our ASME B16.5 lap joint flanges allow for easy alignment, disassembly, and reassembly, making them ideal for piping systems that require frequent maintenance. With excellent corrosion resistance and reliable performance, these flanges are a dependable solution for industrial applications demanding flexibility, durability, and standard compatibility.

Key Features of Lap Joint Flange

Lap Joint Flange Dimension

  • Ease of Installation: The ability to rotate the stainless steel lap-joint flange simplifies alignment, especially in systems where precise bolt alignment is difficult.
  • Reusability: The backing stainless steel flange can be reused if the piping system is dismantled, reducing costs.
  • Reduced Stress: The lap joint design of the stainless steel flange reduces stress at the welding point compared to other flange types.

S&S Stainless Steel Flanges

ASME B16.5 stainless steel lap joint flange with stub end by S&S Stainless, designed for industrial piping systems with sizes up to DN 600.
ASME B16.5/ B16.47 stainless steel weld neck flange by S&S Stainless, available in sizes from 1/2'' to 60''.
ASME B16.5 stainless steel slip-on flange by S&S Stainless, available in sizes ranging from 1/2'' to 24'' for various industrial applications.
ASME B16.5/ B16.47 stainless blind flange, available in sizes from 1/2'' to 60'' with pressure classes from 150 to 2500.
High-quality ASME B16.5 socket weld flanges in pressure classes from 150 to 900, suitable for piping systems.
Premium 304 and 316L stainless steel blind flanges, meeting ASME 16.5 and 16.47 standards.

Lap Joint Flange Dimension