Lap Joint Flange is a loose plate type flange with center bore equal to the pipe diameter. Lap Joint Flange do not have any hub or any flange facing. However the Lap Joint Flanges are coupled with a Stub End Component with serration bearing flat disc & a beveled pipe shaped hub used to weld the corresponding Stub End.

Why Lap Joint Flanges?

Lap Joint Flanges are special purpose flanges designed with primary purpose of reducing the overall Pipeline Cost. Lap Joint Flange assembly consist of 2 parts; A Loose Plate Flange which when assembled over a pipeline will not be in contact with the process fluid; & a Stub End which forms the internal part of the pipeline & its inner wall comes in direct contact with the Process Fluid. Lap Joint assembly can be manufactured in two different materials. For e.g., Low cost Carbon Steel A105 Flange coupled with Stainless Steel A403 WP316 Stub End.

Manufacturing Lap Joint Flange
Lap Joint Plate Flange can be manufactured as forged or directly machined from plates. Whereas Stub has to be manufactured as wrought from parent Pipe, seamless or welded by cold press or hot press method.

Material for Lap Joint Flanges
Lap Joint Flanges & Stub End are manufactured in almost all known ferrous & non-ferrous alloys.

Carbon Steel:
A105 / A105N / A181 / A350 LF2 / LF3 / LF6 / A694 F52 / F60 / F65 / F70 .

Chrome Moly Steel:
A182 F5  /  F9  /  F11  /  F12 /  F22  /  F91  /  F92 .

Stainless Steel:
304 / 304L / 304H / 309 / 309S / 310 / 310S / 316 / 316L / 316H / 316Ti / 317 / 317L / 321 / 321H / 347 / 347H / 348 / 348H .

Duplex Steel:
S31803 / F51 /  S32205 / F60 / 1.4462 .

Super Duplex:
S32750 / F53 / 1.4410 /  S32760 / F55  / 1.4501 .

Nickel:
N02200  /  N02201

Inconel:
600 ( N06600 ) / 601 ( N06601 ) / 625( N06625 ) / 718( N07718 ) / 800 ( N08800 ) / 800H ( N08810 ) / 800HT ( N08811 ) .

Monel:
Monel 400 (UNS N04400) / Monel 400 (Din N2.4360) / Monel K500 (UNS N0550) / Monel K500(Din 2.4375) .
lapjoint-flange-01
lapjoint-flange-02
lapjoint-flange-03
lapjoint-flange-04

Hastelloy:
B2 ( N010665 ) / C22 ( N06022 ) / C276 ( N10276 ) / C200 ( N06200 ) / X ( N06002 ) .

Nimonic:

Nimonic 80a / Nimonic 90 / Nimonic 263 .

Titanium
Grade 1  /  Grade 2  /  Grade 4  /  Grade 5  /  Grade 7  /  Grade 9  /  Grade 12 .

Tantalum:
R05200  /  R05252  /  R05255 /  R5400 .

Zirconium:
R60702 /  R60705 .

Aluminum:
Alloy 5022  /  Alloy 5083  /  Alloy 5086  /  Alloy 6061   /  Alloy 6066 .

Copper Nickel:
C71500 (70:30) / C70600 (90:10)

Applications of Lap Joint Flange

lap Joint Flanges are preferred for low cost pipeline projects specially civil water pipeline projects, Chemical Processing, Paint & Food Processing units & some sector of Oil Transportation pipelines.

Dimensions Lap Joint Flanges, ANSI CLASS 150, ASME B16.5 (IN) DATASHEET

Dimensions shown are for Raised Face and Flat Faced Flanged Datasheets

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • 1/4″ raised face is not included in dimension “C” and “M”.

data ljf b16.5 150 2500data ljf b16.5

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

F

Diameter of Hub at Base

J

Length of Hub

M

Radius


R

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

Approx Weight

 

1/2 3 1/2 7/16 0.90 1 3/16 5/8 1/8 4 5/8 2 3/8 2
3/4 3 7/8 1/2 1.11 1 1/2 5/8 1/8 4 5/8 2 3/4 2
1 4 1/4 9/16 1.38 1 15/16 11/16 1/8 4 5/8 3 1/8 2
1 1/4 4 5/8 5/8 1.72 2 5/16 13/16 3/16 4 5/8 3 1/2 3
1 1/2 5 11/16 1.97 2 9/16 7/8 1/4 4 5/8 3 7/8 3
2 6 3/4 2.46 3 1/16 1 5/16 4 3/4 4 3/4 5
2 1/2 7 7/8 2.97 3 9/16 1 1/8 5/16 4 3/4 5 1/2 7
3 7 1/2 15/16 3.60 4 1/4 1 3/16 3/8 4 3/4 6 8
3 1/2 8 1/2 15/16 4.10 4 13/16 1 1/4 3/8 8 3/4 7 11
4 9 15/16 4.60 5 5/16 1 5/16 7/16 8 3/4 7 1/2 13
5 10 15/16 5.69 6 7/16 1 7/16 7/16 8 7/8 8 1/2 15
6 11 1 6.75 7 9/16 1 9/16 1/2 8 7/8 9 1/2 19
8 13 1/2 1 1/8 8.75 9 11/16 1 3/4 1/2 8 7/8 11 3/4 30
10 16 1 3/16 10.92 12 1 15/16 1/2 12 1 14 1/4 43
12 19 1 1/4 12.92 14 3/8 2 3/16 1/2 12 1 17 64
14 21 1 3/8 14.18 15 3/4 3 1/8 1/2 12 1 1/8 18 3/4 99
16 23 1/2 1 7/16 16.19 18 3 7/16 1/2 16 1 1/8 21 1/4 128
18 25 1 9/16 18.20 19 7/8 3 13/16 1/2 16 1 1/4 22 3/4 146
20 27 1/2 1 11/16 20.25 22 4 1/16 1/2 20 1 1/4 25 185
22 29 1/2 1 13/16 22.25 24 4 1/4 1/2 20 1 3/8 27 1/4 245
24 32 1 7/8 24.25 26 1/8 4 3/8 1/2 20 1 3/8 29 1/2 260

Dimensions Lap Joint Flanges, ANSI CLASS 300, ASME B16.5 (IN) DATASHEET

Dimensions shown are for Raised Face and Flat Faced Flanged Datasheets

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • 1/4″ raised face is not included in dimension “C” and “M”.

data ljf b16.5 150 2500data ljf b16.5

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

F

Diameter of Hub at Base

J

Length of Hub

M

Radius


R

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

Approx Weight

 

1/2 3 3/4 9/16 0.90 1 1/2 7/8 1/8 4 5/8 2 5/8 3
3/4 4 5/8 5/8 1.11 1 7/8 1 1/8 4 3/4 3 1/4 3
1 4 7/8 11/16 1.38 2 1/8 1 1/16 1/8 4 3/4 3 1/2 3
1 1/4 5 1/4 3/4 1.72 2 1/2 1 1/16 3/16 4 3/4 3 7/8 4
1 1/2 6 1/8 13/16 1.97 2 3/4 1 3/16 1/4 4 7/8 4 1/2 6
2 6 1/2 7/8 2.46 3 5/16 1 5/16 5/16 8 3/4 5 7
2 1/2 7 1/2 1 2.97 3 15/16 1 1/2 5/16 8 7/8 5 7/8 10
3 8 1/4 1 1/8 3.60 4 5/8 1 11/16 3/8 8 7/8 6 5/8 13
3 1/2 9 1 3/16 4.10 5 1/4 1 3/4 3/8 8 7/8 7 1/4 17
4 10 1 1/4 4.60 5 3/4 1 7/8 7/16 8 7/8 7 7/8 22
5 11 1 3/8 5.69 7 2 7/16 8 7/8 9 1/4 28
6 12 1/2 1 7/16 6.75 8 1/8 2 1/16 1/2 12 7/8 10 5/8 39
8 15 1 5/8 8.75 10 1/4 2 7/16 1/2 12 1 13 58
10 17 1/2 1 7/8 10.92 12 5/8 3 3/4 1/2 16 1 1/8 15 1/4 91
12 20 1/2 2 12.92 14 3/4 4 1/2 16 1 1/4 17 3/4 139
14 23 2 1/8 14.18 16 3/4 4 3/8 1/2 20 1 1/4 20 1/4 189
16 25 1/2 2 1/4 16.19 19 4 3/4 1/2 20 1 3/8 22 1/2 240
18 28 2 3/8 18.20 21 5 1/8 1/2 24 1 3/8 24 3/4 305
20 30 1/2 2 1/2 20.25 23 1/8 5 1/2 1/2 24 1 3/8 27 375
22 33 2 5/8 22.25 25 1/4 5 3/4 1/2 24 1 5/8 29 1/4 435
24 36 2 3/4 24.25 27 5/8 6 1/2 24 1 5/8 32 530

Dimensions Lap Joint Flanges, ANSI CLASS 400, ASME B16.5, (IN) DATASHEET

Dimensions shown are for Raised Face and Flat Faced Flanged Datasheets

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • 1/4″ raised face is not included in dimension “C” and “M”.

data ljf b16.5 150 2500data ljf b16.5

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

F

Diameter of Hub at Base

J

Length of Hub

M

Radius


R

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

Approx Weight

 

1/2 3 3/4 9/16 0.90 1 1/2 7/8 1/8 4 5/8 2 5/8 3
3/4 4 5/8 5/8 1.11 1 7/8 1 1/8 4 3/4 3 1/4 3
1 4 7/8 11/16 1.38 2 1/8 1 1/16 1/8 4 3/4 3 1/2 4
1 1/4 5 1/4 13/16 1.72 2 1/2 1 1/8 3/16 4 3/4 3 7/8 6
1 1/2 6 1/8 7/8 1.97 2 3/4 1 1/4 1/4 4 7/8 4 1/2 7
2 6 1/2 1 2.46 3 5/16 1 7/16 5/16 8 3/4 5 9
2 1/2 7 1/2 1 1/8 2.97 3 15/16 1 5/8 5/16 8 7/8 5 7/8 12
3 8 1/4 1 1/4 3.60 4 5/8 1 13/16 3/8 8 7/8 6 5/8 15
3 1/2 9 1 3/8 4.10 5 1/4 1 15/16 3/8 8 1 7 1/4 20
4 10 1 3/8 4.60 5 3/4 2 7/16 8 1 7 7/8 25
5 11 1 1/2 5.69 7 2 1/8 7/16 8 1 9 1/4 29
6 12 1/2 1 5/8 6.75 8 1/8 2 1/4 1/2 12 1 10 5/8 42
8 15 1 7/8 8.75 10 1/4 2 11/16 1/2 12 1 1/8 13 64
10 17 1/2 2 1/8 10.92 12 5/8 4 1/2 16 1 1/4 15 1/4 112
12 20 1/2 2 1/4 12.92 14 3/4 4 1/4 1/2 16 1 3/8 17 3/4 152
14 23 2 3/8 14.18 16 3/4 4 5/8 1/2 20 1 3/8 20 1/4 210
16 25 1/2 2 1/2 16.19 19 5 1/2 20 1 1/2 22 1/2 280
18 28 2 5/8 18.20 21 5 3/8 1/2 24 1 1/2 24 3/4 345
20 30 1/2 2 3/4 20.25 23 1/8 5 3/4 1/2 24 1 5/8 27 420
22 33 2 7/8 22.25 25 1/4 6 1/2 24 1 3/4 29 1/4 455
24 36 3 24.25 27 5/8 6 1/4 1/2 24 1 7/8 32 615

Dimensions Lap Joint Flanges, ANSI CLASS 600, ASME B16.5, (IN) DATASHEET

Dimensions shown are for Raised Face and Flat Faced Flanged Datasheets

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • 1/4″ raised face is not included in dimension “C” and “M”.

data ljf b16.5 150 2500data ljf b16.5

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

F

Diameter of Hub at Base

J

Length of Hub

M

Radius

R

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

Approx Weight

 

1/2 3 3/4 9/16 0.90 1 1/2 7/8 1/8 4 5/8 2 5/8 3
3/4 4 5/8 5/8 1.11 1 7/8 1 1/8 4 3/4 3 1/4 3
1 4 7/8 11/16 1.38 2 1/8 1 1/16 1/8 4 3/4 3 1/2 4
1 1/4 5 1/4 13/16 1.72 2 1/2 1 1/8 3/16 4 3/4 3 7/8 6
1 1/2 6 1/8 7/8 1.97 2 3/4 1 1/4 1/4 4 7/8 4 1/2 7
2 6 1/2 1 2.46 3 5/16 1 7/16 5/16 8 3/4 5 9
2 1/2 7 1/2 1 1/8 2.97 3 15/16 1 5/8 5/16 8 7/8 5 7/8 12
3 8 1/4 1 1/4 3.60 4 5/8 1 13/16 3/8 8 7/8 6 5/8 15
3 1/2 9 1 3/8 4.10 5 1/4 1 15/16 3/8 8 1 7 1/4 20
4 10 3/4 1 1/2 4.60 6 2 1/8 7/16 8 1 8 1/2 36
5 13 1 3/4 5.69 7 7/16 2 3/8 7/16 8 1 1/8 10 1/2 61
6 14 1 7/8 6.75 8 3/4 2 5/8 1/2 12 1 1/8 11 1/2 78
8 16 1/2 2 3/16 8.75 10 3/4 3 1/2 12 1 1/4 13 3/4 112
10 20 2 1/2 10.92 13 1/2 4 3/8 1/2 16 1 3/8 17 195
12 22 2 5/8 12.92 15 3/4 4 5/8 1/2 20 1 3/8 19 1/4 240
14 23 3/4 2 3/4 14.18 17 5 1/2 20 1 1/2 20 3/4 290
16 27 3 16.19 19 1/2 5 1/2 1/2 20 1 5/8 23 3/4 400
18 29 1/4 3 1/4 18.20 21 1/2 6 1/2 20 1 3/4 25 3/4 469
20 32 3 1/2 20.25 24 6 1/2 1/2 24 1 3/4 28 1/2 604
22 34 1/4 3 3/4 22.25 26 1/2 6 7/8 1/2 24 1 7/8 30 5/8 670
24 37 4 24.25 28 1/4 7 1/4 1/2 24 2 33 866

Dimensions Lap Joint Flanges, ANSI CLASS 900, ASME B16.5 (IN) DATASHEET

Dimensions shown are for Raised Face and Flat Faced Flanged Datasheets

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • 1/4″ raised face is not included in dimension “C” and “M”.

data ljf b16.5 150 2500data ljf b16.5

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

F

Diameter of Hub at Base

J

Length of Hub

M

Radius

R

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

Approx Weight

 

1/2 4 3/4 7/8 0.90 1 1/2 1 1/4 1/8 4 7/8 3 1/4 9
3/4 5 1/8 1 1.11 1 3/4 1 3/8 1/8 4 7/8 3 1/2 9
1 5 7/8 1 1/8 1.38 2 1/16 1 5/8 1/8 4 1 4 9
1 1/4 6 1/4 1 1/8 1.72 2 1/2 1 5/8 3/16 4 1 4 3/8 10
1 1/2 7 1 1/4 1.97 2 3/4 1 3/4 1/4 4 1 1/8 4 7/8 14
2 8 1/2 1 1/2 2.46 4 1/8 2 1/4 5/16 8 1 6 1/2 25
2 1/2 9 5/8 1 5/8 2.97 4 7/8 2 1/2 5/16 8 1 1/8 7 1/2 35
3 9 1/2 1 1/2 3.60 5 2 1/8 3/8 8 1 7 1/2 30
3 1/2
4 11 1/2 1 3/4 4.60 6 1/4 2 3/4 7/16 8 1 1/4 9 1/4 51
5 13 3/4 2 5.69 7 1/2 3 1/8 7/16 8 1 3/8 11 81
6 15 2 3/16 6.75 9 1/4 3 3/8 1/2 12 1 1/4 12 1/2 105
8 18 1/2 2 1/2 8.75 11 3/4 4 1/2 1/2 12 1 1/2 15 1/2 188
10 21 1/2 2 3/4 10.92 14 1/2 5 1/2 16 1 1/2 18 1/2 277
12 24 3 1/8 12.92 16 1/2 5 5/8 1/2 20 1 1/2 21 371
14 25 1/4 3 3/8 14.18 17 3/4 6 1/8 1/2 20 1 5/8 22 397
16 27 3/4 3 1/2 16.19 20 6 1/2 1/2 20 1 3/4 24 1/4 488
18 31 4 18.20 22 1/4 7 1/2 1/2 20 2 27 670
20 33 3/4 4 1/4 20.25 24 1/2 8 1/4 1/2 20 2 1/8 29 1/2 868
22
24 41 5 1/2 24.25 29 1/2 10 1/2 1/2 20 2 5/8 35 1/2 1659

Dimensions Lap Joint Flanges, ANSI CLASS 1500, ASME B16.5 (IN) DATASHEET

Dimensions shown are for Raised Face and Flat Faced Flanged Datasheets

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • 1/4″ raised face is not included in dimension “C” and “M”.

data ljf b16.5 150 2500data ljf b16.5

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

F

Diameter of Hub at Base

J

Length of Hub

M

Radius


R

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

Approx Weight

 

1/2 4 3/4 7/8 0.90 1 1/2 1 1/4 1/8 4 7/8 3 1/4 9
3/4 5 1/8 1 1.11 1 3/4 1 3/8 1/8 4 7/8 3 1/2 9
1 5 7/8 1 1/8 1.38 2 1/16 1 5/8 1/8 4 1 4 9
1 1/4 6 1/4 1 1/8 1.72 2 1/2 1 5/8 3/16 4 1 4 3/8 10
1 1/2 7 1 1/4 1.97 2 3/4 1 3/4 1/4 4 1 1/8 4 7/8 14
2 8 1/2 1 1/2 2.46 4 1/8 2 1/4 5/16 8 1 6 1/2 25
2 1/2 9 5/8 1 5/8 2.97 4 7/8 2 1/2 5/16 8 1 1/8 7 1/2 35
3 10 1/2 1 7/8 3.60 5 1/4 2 7/8 3/8 8 1 1/4 8 47
3 1/2
4 12 1/4 2 1/8 4.60 6 3/8 3 9/16 7/16 8 1 3/8 9 1/2 75
5 14 3/4 2 7/8 5.69 7 3/4 4 1/8 7/16 8 1 5/8 11 1/2 138
6 15 1/2 3 1/4 6.75 9 4 11/16 1/2 12 1 1/2 12 1/2 170
8 19 3 5/8 8.75 11 1/2 5 5/8 1/2 12 1 3/4 15 1/2 286
10 23 4 1/4 10.92 14 1/2 7 1/2 12 2 19 485
12 26 1/2 4 7/8 12.92 17 3/4 8 5/8 1/2 16 2 1/8 22 1/2 749
14 29 1/2 5 1/4 14.18 19 1/2 9 1/2 1/2 16 2 3/8 25 890
16 32 1/2 5 3/4 16.19 21 3/4 10 1/2 1/2 16 2 5/8 27 3/4 1150
18 36 6 3/8 18.20 23 1/2 10 7/8 1/2 16 2 7/8 30 1/2 1475
20 38 3/4 7 20.25 25 1/4 11 1/2 1/2 16 3 1/8 32 3/4 1775
22
24 46 8 24.25 30 13 1/2 16 3 5/8 39 2825

Dimensions Lap Joint Flanges, ANSI CLASS 2500, ASME B16.5 (IN) DATASHEET

Dimensions shown are for Raised Face and Flat Faced Flanged Datasheets

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • 1/4″ raised face is not included in dimension “C” and “M”.

data ljf b16.5 150 2500data ljf b16.5

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

F

Diameter of Hub at Base

J

Length of Hub

M

Radius


R

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

Approx Weight

 

1/2 5 1/4 1 3/16 0.90 1 11/16 1 9/16 1/8 4 7/8 3 1/2 7
3/4 5 1/2 1 1/4 1.11 2 1 11/16 1/8 4 7/8 3 3/4 8
1 6 1/4 1 3/8 1.38 2 1/4 1 7/8 1/8 4 1 4 1/4 12
1 1/4 7 1/4 1 1/2 1.72 2 7/8 2 1/16 3/16 4 1 1/8 5 1/8 17
1 1/2 8 1 3/4 1.97 3 1/8 2 3/8 1/4 4 1 1/4 5 3/4 24
2 9 1/4 2 2.46 3 3/4 2 3/4 5/16 8 1 1/8 6 3/4 37
2 1/2 10 1/2 2 1/4 2.97 4 1/2 3 1/8 5/16 8 1 1/4 7 3/4 53
3 12 2 5/8 3.60 5 1/4 3 5/8 3/8 8 1 3/8 9 80
3 1/2
4 14 3 4.60 6 1/2 4 1/4 7/16 8 1 5/8 10 3/4 122
5 16 1/2 3 5/8 5.69 8 5 1/8 7/16 8 1 7/8 12 3/4 204
6 19 4 1/4 6.75 9 1/4 6 1/2 8 2 1/8 14 1/2 314
8 21 3/4 5 8.75 12 7 1/2 12 2 1/8 17 1/4 471
10 26 1/2 6 1/2 10.92 14 3/4 9 1/2 12 2 5/8 21 1/4 897
12 30 7 1/4 12.92 17 3/8 10 1/2 12 2 7/8 24 3/8 1262

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