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Stainless Steel Lap Joint Flanges



Stainless steel lap joint flanges specification

Size Range Types Of Face Range Of Names
  • DN15 - DN1200
  • 1/2" to 24"
  • PN 2.5 - PN 400
  • RTJ lap joint flange
  • Flat face lap joint flange
  • Raised face lap joint flange
  • Back Up flanges
  • Loose Ring flanges
  • Loose Hubbed flanges
  • Van Stone flanges
  • Lapped flange
  • Loose flange
Two Elements of Stainless Steel Lap Joint Flange Sealing Face Surface
  • Stub end
  • Lap-joint ring flange
Lapped flange has no sealing face Carbon steel lap joint flange always have a flat face (FF) with a smooth surface
Sealing Face of A Lap Joint Stub End Lengths of stub end with lap joint flange Welding
  • Plain
  • Serrated
  • Grooved
  • Short lengths
  • Long lengths
  • Arc-welding (MIG)
  • Inert tungsten gas (TIG ) welding
Manufacturing Method Of Stainless Steel Vanstone Flange Threads Types Surface
  • Cast
  • Forged
  • Plate
No Threads
  • Stock finish
  • Serrated finish
  • Spiral serrated
  • Concentric serrated
  • Smooth finish
Bolt Hole Application Buying Tips
4 To 24
  • Refinery industry
  • Gas & Oil applications
  • Nuclear power
  • Industrial piping connection
  • Petrochemical plants
  • Size
  • End Type
  • Tested
  • Style
  • O.D.
  • Type
  • Thickness
  • Materials
  • Length
  • Mass
  • Pressure Rating
Bolt Circle Services Inspection Criteria
2-1/4 To 32 (Inch)
  • Cutting
  • MTR certification
  • Coating
  • Polishing
  • Beveling end
  • Marking tagging
  • Tensile test
  • PMI test
  • Visual inspection
  • Material inspection
  • Impact test
  • Hardness test
Markings On Backing Flange and Stub End Types Of Coating Process Of Machining
  • Grade
  • Heat Number
  • Country origin
  • Manufacturer name
  • Size
  • Schedule
  • ASTM material
  • Pressure rating
  • Face type
  • Yellow paint
  • Hot dip galvanized
  • Anti-rust oil
  • Oil black paint
  • Zinc plated
  • Heat treatment
  • Forming
  • Material selection
  • Quality control
  • Forging
  • Machining
  • Surface finish
  • Material cutting
  • Shaping
  • Inspection
DIN & AME Standard Thickness Temperature
  • DIN 2642 lap joint flange
  • ASME B16.5
  • ANSI B16.5
  • SCH 20
  • SCH 40
  • SCH 80
  • SCH 100
  • SCH 120
  • SCH 160
-20 To 1500
Production Way Pressure Manufacturing Origin & Standards
  • Raw Material
  • Inspection
  • Cutting
  • Forging
  • Heat Treatment
  • Forging Rolling
  • Final Inspection
  • Rust Prevention
  • Marking
  • Heat Number
  • Packaging
  • 150 LB
  • 300 LB
  • 600 LB
  • 900 LB
  • 1500 LB
  • 2500 LB
  • MSS SP44 - USA
  • DIN- Germany
  • API-605 - USA
  • PN 10 to PN400- Europe
  • BS 10- Australia and UK
  • UNI 2276/ 6091 - Italy
  • AWWA - USA
  • ANSI B16.5 - USA
  • ASME B16.5- USA
  • Ghost - Russia
  • BS EN 1092-1 - Europe
  • JIS - Japan


We offer 3LPE coating for the lapped flange, and stub end lap joint flange available in schedule 20/ 40/ 80/ 120

Common coating types of carbon steel lap joint flange

  • Hot dip galvanized
  • Oil black paint
  • Anti-rust oil
  • Yellow paint
  • 3LPE coating
  • FBE Coating


Loose flange schedule chart

Normal Size Of Steel Pipe Schedule 10 Schedule 40 Schedule 80 Schedule 120 Schedule 180
½ 0.08 0.10 0.14 ... 0.18
¾ 0.08 0.11 0.15 ... 0.21
1 0.10 0.13 0.17 ... 0.25
1 ¼ 0.10 0.14 0.19 ... 0.25
1 ½ 0.10 0.14 0.20 ... 0.28
2 0.10 0.15 0.21 ... 0.34
3 0.12 0.21 0.30 - 0.43
4 0.12 0.23 0.33 0.43 0.53
5 0.13 0.25 0.37 0.50 0.62
6 0.13 0.28 0.43 0.56 0.71
8 0.14 0.32 0.50 0.71 0.90
10 0.16 0.36 0.59 0.84 1.12
12 0.18 0.40 0.68 1 1.31
14 0.25 0.43 0.75 1.09 1.40
16 0.25 0.50 0.84 1.21 1.59
18 0.25 0.56 0.93 1.37 1.78
20 0.25 0.59 1.03 1.5 1.96
22 0.25 - - - -
24 0.25 0.68 1.21 1.81 2.34

SS lap joint flange price

Buy vanstone flange with leak-proof test reports, check the difference between LJ flange and rolled angle rings

SS lap joint flange price

( Grade : 310S, Class 300) Price per piece in US Dollar

  • 1/2", SCH 40, RF
  • 3/4", SCH 40, RF
  • 1", SCH 40, RF
  • 1 1/2", SCH 40, RF
  • 2", RF, SCH 40
  • 2 1/2", RF, SCH 40
  • 3", RF, SCH 40
  • 4", RF, SCH 40
  • US $1.06
  • US $1.44
  • US $2.40
  • US $3.10
  • US $4.14
  • US $5.24
  • US $6.41
  • US $7.89


Difference between rolled angle rings and LJRF flange

Difference between rolled angle rings and LJRF flange


Benefits of using raised face lap joint flange and back up flanges in petrochemical applications


Benefits of using lapped flange

Benefits of using lapped flange

Types Of ASME B16.5 lap joint flange

Loose flange

Loose flange

Lapped flange

Lapped flange

LJ flange

LJ flange

Vanstone flange

Vanstone flange

Stub end lap joint flange

Stub end lap joint flange

Raised face lap joint flange

Raised face lap joint flange

Back up flanges

Back up flanges

RFLJ Flange

RFLJ Flange

Pressed loose flange

Pressed loose flange

stainlessSsteel vanstone flange

Stainless steel vanstone flange

Lapped joint flange

Lapped joint flange

Lap joint flange with stub end

Lap joint flange with stub end

Stub end with backing flange

Stub end with backing flange

Loose ring flange

Loose ring flange

Loose hubbed flanges

Loose hubbed flanges



Don't forget to check ASME B16.5 lap joint flange dimensions in RTJ/ RF/ FF face type, learn about the pressed loose flange pressure rating in class 150 to 2500


Stainless steel lap joint flanges dimensions

Stainless steel lap joint flanges dimensions
Normal Pipe Size I.D. (MM) O.D. (MM) RA B(Bolt Hole) Bolt Holes Number BC (Bolt Circle ) H Thickness1 (T1) In MM Thickness2 (T2) In MM
1/2 22.35 88.9 .12 .62 4 2.38 1.19 11.17 15.74
3/4 27.68 98.55 .12 .62 4 2.75 1.50 12.7 15.74
1 34.54 107.95 .12 .62 4 3.12 1.94 14.22 17.52
1-1/4 43.18 117.34 .19 .62 4 3.50 2.31 15.74 20.57
1-1/2 50.03 127 .25 .62 4 3.88 2.56 17.52 22.35
2 61.97 152.4 .31 .75 4 4.75 3.06 19.05 25.4
2-1/2 74.67 177.8 .31 .75 4 5.50 3.56 22.35 28.44
3 90.67 190.5 .38 .75 4 6.00 4.25 23.87 30.22
3-1/2 103.37 215.9 .38 .75 8 7.00 4.81 23.87 31.75
4 116.07 228.6 33.27 .44 .75 8 7.50 5.31 23.87
5 143.76 254 .44 .88 8 8.50 6.44 23.87 36.57
6 170.68 279.4 .50 .88 8 9.50 7.56 25.4 39.62
8 221.48 342.9 .50 .88 8 11.75 9.69 28.44 44.45
10 276.35 406.4 .50 1.00 12 14.25 12.00 30.22 49.27
12 327.15 482.6 .50 1.00 12 17.00 14.38 31.75 55.62
14 359.15 533.4 .50 1.12 12 18.75 15.75 35.05 79.24
16 410.46 596.9 .50 1.12 16 21.25 18.00 36.57 87.37
18 461.77 635 .50 1.25 16 22.75 19.88 39.62 96.77
20 513.0 698.5 .50 1.25 20 25.00 22.00 42.92 103.12
22 564.38 749.3 .50 1.38 20 27.25 24.25 45.97 107.95
24 615.95 812.8 .50 1.38 20 29.50 26.12 47.75 111.25


300# lap joint flange dimensions

300# lap joint flange dimensions
Normal Pipe Size I.D. (MM) O.D. (MM) RA B(Bolt Hole) Bolt Holes Number BC (Bolt Circle ) H Thickness1 (T1) In MM Thickness2 (T2) In MM
1/2 22.86 95.25 .12 0.62 4 2.62 1.50 14.22 22.35
3/4 28.19 117.34 .12 0.75 4 3.25 1.88 15.74 25.4
1 35.05 123.95 .12 0.75 4 3.50 2.12 17.52 26.92
1-1/4 43.68 133.35 .19 0.75 4 3.88 2.50 19.05 26.92
1-1/2 50.03 155.44 .25 0.88 4 4.50 2.75 20.57 30.22
2 62.4 165.1 .31 0.75 8 5.00 3.31 22.35 33.27
2-1/2 75.43 190.5 .31 0.88 8 5.88 3.94 25.4 38.1
3 91.44 209.55 .38 0.88 8 6.62 4.62 28.44 42.92
3-1/2 104.14 228.6 .38 0.88 8 7.25 5.25 30.22 44.45
4 116.84 254 .44 0.88 8 7.88 5.75 31.75 47.75
5 144.52 279.4 .44 0.88 8 9.25 7.00 35.05 50.8
6 171.45 317.5 .50 0.88 12 10.62 8.12 36.57 52.32
8 222.25 381 .50 1.00 12 13.00 10.25 41.14 61.97
10 277.36 444.5 .50 1.12 16 15.25 12.62 47.75 95.25
12 328.16 520.7 .50 1.25 16 17.75 14.75 50.8 101.6
14 360.17 584.2 .50 1.25 20 20.25 16.75 53.84 111.25
16 411.22 647.7 .50 1.38 20 22.50 19.00 57.15 120.65
18 462.28 711.2 .50 1.38 24 24.75 21.00 60.45 130.04
20 514.35 774.7 .50 1.38 24 27.00 23.12 63.5 139.7
22 565.15 838.2 .50 1.63 24 29.25 25.25 66.80 146.0
24 615.95 914.4 .50 1.62 24 32.00 27.62 69.85 152.4


Lap joint flange weight in KG

NPS Class 150 Lap
Joint
Class 300 Lap
Joint
Class 600 Lap
Joint
Class 900 Lap
Joint
Class 1500 Lap
Joint
1/2 0.5 0.9 0.9 2.7 2.7
3/4 0.9 1.4 1.4 2.7 2.7
1 0.9 1.4 1.8 3.4 3.6
1.4 2.1 2.3 4.5 4.5
1.4 2.9 3.2 6.3 6.3
2 2.3 3.2 4.1 9.5 11.3
3.6 4.5 5.4 11.3 15.8
3 4.1 6.5 6.8 13.0 21.2
4 7.7 9 - -
4 5.9 10.8 16.2 22 33.8
5 6.8 12.6 28.4 36.5 63
6 8.6 17.6 35.1 47.3 76.5
8 13.5 26.1 50.4 85.5 128.7
10 19.4 40 87.8 124.7 218.3
12 28.8 63 108 166 337.1
14 47.3 85.5 130.5 186.8 400.5
16 63 105.3 180 219.6 562.5
18 72 137.3 211.1 301.5 787.5
20 87.8 168.8 271.8 390.6 798.8
22 110.3 195.8 301.5 - -
24 123.8 247.5 389.7 746.6 1271


LJ flange pressure rating

Temperature °F (Fahrenheit) 150 LBS 300 LBS 600 LBS 900 LBS 1500 LBS 2500 LBS
-20 to 100 275 720 1440 2160 3600 6000
200 235 620 1240 1860 3095 5160
300 215 560 1120 1680 2795 4660
400 195 515 1025 1540 2570 4280
500 170 480 955 1435 2390 3980
600 140 450 900 1355 2255 3760
700 110 430 870 1305 2170 3620
800 80 420 845 1265 2110 3520
900 50 415 830 1245 2075 3460
1000 20 350 700 1050 1750 2915
1100 20 305 610 915 1525 2545
1200 20 185 370 555 925 1545
1300 20 115 235 350 585 970
1400 20 75 150 225 380 630
1500 20 40 85 125 205 345

Advantages of raised face lap joint flange

  • Easy disassembly and assembly
  • Flexibility alignment
  • Cost effective solution
  • Corrosion resistance

Non-Destructive testing for vanstone flange

  • MPI (Magnetic particle inspection)
  • DPI (Dye penetrant inspection)
  • RT (Radiographic testing)
  • UT (Ultrasonic testing)

Material of stub end lap joint flange

Inconel Lap Joint Flanges Incoloy Lap Joint Flanges Hastelloy Lap Joint Flanges
  • Inconel 600 : ASTM B564 UNS N06600 lapped flange
  • Inconel 625 : ASTM B564 UNS N06625 LJ flange
  • Inconel 601 : ASTM B564 UNS N06601 vanstone flange
  • Inconel 617 : ASTM B564 UNS N06617 stub end lap joint flange
  • Inconel 686 : ASTM B564 UNS N06686 raised face lap joint flange
  • Inconel 690 : ASTM B564 UNS N06690 back up flanges
  • Inconel 725 : ASTM B564 UNS N07725 RFLJ Flange
  • 693, MA754, 751, 706, 718, 601GC, MA758, 783, X-750, 602CA, 603XL, 718SPF
  • Incoloy 800 : ASTM B407 UNS N08800 pressed loose flange
  • Incoloy 800H : ASTM B407 UNS N08810 vanstone flange
  • Incoloy 800HT : ASTM B407 UNS N08811 joint flange
  • Incoloy 825 : ASTM B407 UNS N08825 lapped joint flange
  • 903, 907, 945, 925, 926, 832, 330, 25-6HN, DS, 028, 020,909, 945X, MA956, 908, A-286, 27-7MO, 864, 890
  • Hastelloy C22 : ASTM B366 UNS N06022 lap joint flange with stub end
  • Hastelloy C276 : ASTM B366 UNS N10276 lap joint pipe flanges
  • Hastelloy C2000 : ASTM B366 UNS N06200 backing flange and stub end
  • B-2, B, B-3, C, C-4, G-35, G-30, N, G-3, S, W, X
Monel Lap Joint Flanges Nickel Alloy Lap Joint Flanges Copper Nickel Lap Joint Flanges
  • Monel 400 : ASTM B564 UNS N04400 loose type flange
  • Monel 401 : ASTM B564 UNS N04401 stub end with backing flange
  • Monel K500 : ASTM B564 UNS N05500 loose ring flange
  • Nickel Alloy 200 : ASTM B564 UNS N02200 flange lapped
  • Nickel Alloy 201 : ASTM B564 UNS N02201 loose ring flanges
  • Copper Nickel 90/10 : ASTM B151 UNS C70600 loose hubbed flanges
  • Copper Nickel 70/30 : ASTM B151 UNS C71500 lap joint flange stub end
Stainless Steel Lap Joint Flanges Carbon Steel Lap Joint Flanges Alloy Steel Lap Joint Flanges
  • ASTM A105/N
  • ASTM A350 LF2
  • Low Temperature Carbon Steel
  • ASTM A694 Gr F42
  • Grade F46
  • High Yield F52
  • ASME SA694 Grade F56
  • Carbon steel F60
  • SA 694 F70 F65
  • Alloy Steel F1
  • A182 Gr F5
  • ASME SA182 F9
  • ASTM A182 F11
  • F22 Alloy Steel
  • SA 182 Grade F91
Super Duplex Lap Joint Flanges Duplex Lap Joint Flanges Titanium Lap Joint Flanges
  • A182 Grade F53
  • Super Duplex F55
  • ASTM A182 F60
  • ASME SA182 Gr F61
  • ASTM/ ASME SA182 F51
  • ASTM/ ASME SA182 F44
  • Titanium Grade 2 : ASTM B381 UNS R50400 loose flange
  • Titanium Grade 5 : ASTM B381 USN R56400 lap joint flange


LJRF Flange bolt chart

NPS Diameter(MM) Bolt Holes Diameter(MM) Bolt Circle (inches) Number Bolts Bolts Diameter(MM)
1/4 76.2 15.74 2-1/4 4 12.7
1/2 76.4 15.74 2-5/8 4 12.7
3/4 101.6 19.05 3-1/4 4 15.87
1 101.78 19.05 3-1/2 4 15.87
1-1/4 127 19.05 3-7/8 4 15.87
1-1/2 152.4 22.35 4-1/2 4 19.05
2 152.87 19.20 5 8 15.87
2-1/2 177.8 22.35 5-7/8 8 19.05
3 203.2 22.35 6-5/8 8 19.05
3-1/2 228.6 22.35 7-1/4 8 19.05
4 254 22.35 7-7/8 8 19.05
5 279.4 22.35 9-1/4 8 19.05
6 304.8 22.35 10-5/8 12 19.05
8 381 25.4 13 12 22.22
10 431.8 28.44 15-1/4 16 25.4
12 508 31.75 17-3/4 16 25.4
14 584.2 31.75 20-1/4 20 25.4
16 635 35.05 22-1/2 20 25.4
18 711.2 35.05 24-3/4 24 25.4
20 762 35.05 27 24 25.4
24 914.4 41.14 32 24 25.50