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Stub Ends for Flanged Joints

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What is a stub end and why should it be used? Stub ends are buttweld fittings that can be used (in combination with a lap joint flange) alternatively to welding neck flanges to make flanged connections. The use of stub ends has two advantages: it can reduce the total cost of flanged joints for piping systems in high material grades (as the lap joint flange does not need to be of the same material of the pipe and the stub end but can be a lower grade); it speeds up the installation process, as the lap joint flange can be rotated to facilitate the alignment of the bolt holes. Stub ends are available in short and long pattern (ASA and MSS stub ends), in sizes up to 80 inches.

STUB END APPLICATION

A stud end and a lap joint flange can be used together as an alternative way to make a flanged connection than welding neck flanges.

The two devices to be combined, in this case, are:

  • The stub end, which is essentially a piece of pipe, with one end flared outwards and the other prepared to be welded to a pipe of the same bore size (NPS = nominal pipe size), material and wall thickness. The most widely used fabrication tool for stub ends is the flaring machine, which is able to flare the end of the pipe and then cuts it to length.
  • A Lap Joint Flange, which is used to actually bolt the two lengths of pipe together.

flanged joint with stub end

 BENEFITS OF LAP JOINT STUB ENDS

The use of stub ends has these two advantages:

Reduces the overall cost of the flanged joint

Generally, the lap joint flange is of a lower grade than the material of the stub end and the pipework, thus saving the total weight of high-grade material used for the flanged joint.

Example:

For an SS316 pipe, instead of using a full 316 welding neck flange, a combination of an SS316 stub end and a carbon steel lap joint flange would do the same exact job, but the total weight of SS316 material would be lower, and the cost as well.

Essentially, stub ends allow to minimize the weight of high-grade material in stainless, duplex, and nickel alloy piping, saving costs. Of course, the bigger the diameter and the class of the flanges, the higher the saving!

Facilitates the installation of the flange

The lap joint flange can be rotated on the pipe and simplify the alignment of the bolt holes of the mating flanges

It shall be noted that stud ends are becoming popular also in high-pressure applications (whereas they were used for low-pressure applications only in the past).

Stub end with lap joint flange

STUB END TYPES

Stub ends are available in three different types, named “Type A”, “Type B” and “Type C”:

  • The first type (A) is manufactured and machined to match standard lap joint backing flange (the two products have to be used in combination). The mating surfaces have an identical profile to permit a smooth loading of the flare face
  • Stub ends type B are have to be used with standard slip-on flanges
  • Type C stub ends can be used either with lap joint or slip-on flanges and are manufactured from pipes

Stub end types

SHORT/LONG PATTERN STUB ENDS (ASA/MSS)

Stub ends are available in two different patterns:

  • the short pattern, called MSS-A stub ends
  • the long pattern, called ASA-A stub ends (or ANSI length stub end)
Short and long pattern stub ends
Short pattern (MSS) and long pattern stub ends (ASA)

STUB END FINISH

Stub ends can be ordered with different ends finishing:

  • Beveled Ends
  • Squared Ends
  • Flanged Ends
  • Grooved Ends
  • Threaded Ends (Male Only)

STUB END MATERIALS

ASTM Grade UNS Equivalent
A234 WPB Carbon Steel B K03006
A403 Stainless Steel 304/304L S30403
304H S30409
316/316L S31603
316H S31609
317L S31703
904L N08904
309S/H S30908
310S S31008
321 S32100
6XN N08367
20CB N08020
347 S34709
254SMO S31254
A815 Duplex /Super Duplex 2205 S31803/S32205
Zeron 100 S32760
2507 S32750
410 S41000
A366 Nickel Alloys HC22 N06022
HB-3 N10675
HG3 N06985
HX N06002
HC2000 N06200
HC276 N10276
NCI N06600
NC N04400
N N02200
NL N02201
NCMC N06625
NICMC N08825
NIC10 N08810
NIC11 N08811

STUB ENDS DIMENSIONS

The chart shows the MSS and ANSI stub end dimensions in inches.

MSS Stub EndANSI Stub EndPipe ODPipe WTLap ODRadiusFlange thk
NPSSchMinNomMaxMinNomMaxMinNomMaxMinNomMaxMinMaxMinNomMinMax
1/2″05S1.9422.062.9433.060.8090.840.8960.0570.0650.0731.351.383/321/80.0650.127
10S0.0730.0830.0930.0830.145
40S0.0950.1090.1230.1090.171
80S0.1290.1470.1650.1470.209
3/4″05S1.9422.062.9433.061.0191.051.1060.0570.0650.0731.661.693/321/80.0650.127
10S0.0730.0830.0930.0830.145
40S0.0990.1130.1270.1130.175
80S0.1350.1540.1730.1540.216
105S1.9422.063.9444.061.2841.3151.3760.0570.0650.0731.723/321/80.0650.127
10S0.0950.1090.1230.1090.171
40S0.1160.1330.150.1330.195
80S0.1570.1790.2010.1790.241
1 1/405S1.9422.063.9444.061.6291.661.7160.0570.0650.0732.472.55/323/160.0650.127
10S0.0950.1090.1230.1090.171
40S0.1230.140.1580.140.202
80S0.1670.1910.2150.1910.253
1 1/205S1.9422.063.9444.061.8691.91.9650.0570.0650.0732.852.887/321/40.0650.127
10S0.0950.1090.1230.1090.171
40S0.1270.1450.1630.1450.207
80S0.1750.20.2250.20.262
205S2.442.52.565.9466.062.3442.3752.4560.0570.0650.0733.593.629/325/160.0650.127
10S0.0950.1090.1230.1090.171
40S0.1350.1540.1730.1540.216
80S0.1910.2180.2450.2180.28
2 1/205S2.442.52.565.9466.062.8442.8752.9660.0730.0830.0933.94.129/325/160.0830.145
10S0.1050.120.1350.120.182
40S0.1780.2030.2280.2030.265
80S0.2420.2760.3110.2760.338
305S2.442.52.565.9466.063.4693.53.5960.0730.0830.0934.97511/323/80.0830.145
10S0.1050.120.1350.120.182
40S0.1890.2160.2430.2160.278
80S0.2630.30.3380.30.362
3 1/205S2.9433.065.9466.063.96944.0960.0730.0830.0935.475.511/323/80.0830.145
10S0.1050.120.1350.120.182
40S0.1980.2260.2540.2260.238
80S0.2780.3180.3580.3180.38
405S2.9433.065.9466.064.4694.54.5930.0730.0830.0936.166.193/87/160.0830.145
10S0.1050.120.1350.120.182
40S0.2070.2370.2670.2370.299
80S0.2950.3370.3790.3370.399
505S2.9433.067.9488.065.5325.5635.6830.0950.1090.1237.287.313/87/160.1090.171
10S0.1170.1340.1510.1340.196
40S0.2260.2580.290.2580.32
80S0.3280.3750.4220.3750.437
605S3.443.53.567.9488.066.5946.6256.7430.0950.1090.1238.478.57/161/20.1090.171
10S0.1170.1340.1510.1340.196
40S0.2450.280.3150.280.342
80S0.3780.4320.4860.4320.494
805S3.9444.067.9488.068.5948.6258.7430.0950.1090.12310.5910.627/161/20.1090.171
10S0.130.1480.1670.1480.21
40S0.2820.3220.3620.3220.384
80S0.4380.50.5630.50.562
1005S4.9155.099.911010.0910.71910.7510.9130.1170.1340.15112.6912.757/161/20.1340.196
10S0.1440.1650.1860.1650.227
40S0.3190.3650.4110.3650.427
80S0.4380.50.5630.50.562
1205S5.9166.099.911010.0912.71912.7512.9130.1370.1560.17614.94157/161/20.1560.218
10S0.1580.180.2030.180.242
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
1405S5.9166.0911.911212.0913.9691414.170.1370.1560.17616.1916.257/161/20.1560.218
10S0.1650.1880.2120.1880.25
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
1605S5.9166.0911.911212.0915.9691616.180.1440.1650.17618.4418.57/161/20.1650.227
10S0.1650.1880.2120.1880.25
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
1805S5.9166.0911.911212.0917.9691818.190.1440.1650.17620.94217/161/20.1650.227
10S0.1650.1880.2120.1880.25
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
2005S5.9166.0911.911212.0919.9692020.240.1650.1880.21222.94237/161/20.1880.25
10S0.1910.2180.2450.2180.28
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
2405S5.8166.1911.911212.0923.9692424.240.1910.2180.24527.1927.257/161/20.2180.28
10S0.2190.250.2810.250.312
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
2605S5.8166.1911.811212.1925.9692626.2429.1929.257/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
2805S5.8166.1911.811212.1927.9692828.2431.6931.757/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
3005S5.8166.1911.811212.1929.9693030.2433.6933.757/161/2
10S0.2730.3120.3510.3120.374
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
3205S5.8166.1911.811212.1931.9693232.2435.94367/161/2
10S
40S0.3280.3750.4220.3750.422
80S0.4380.50.5630.50.563
3405S5.8166.1911.811212.1933.9693434.2437.94387/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
3605S5.8166.1911.811212.1935.9693636.2440.1940.257/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
3805S5.8166.1911.811212.1937.9693838.2442.6942.757/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
4005S5.8166.18611.811212.1939.9694040.2444.6944.757/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
4205S5.8166.18611.811212.1941.9694242.2446.94477/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
4405S5.8166.18611.811212.1943.9694444.2449.1919.257/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
4605S5.8166.1911.811212.1945.9694646.2451.1951.257/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.5630.50.562
4805S5.8166.1911.811212.1947.9694848.2453.1953.257/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
5005S5.8166.1911.811212.1949.9695050.2455.1955.257/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
5205S5.8166.1911.811212.1951.9695252.2457.1957.257/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562
5405S5.8166.1911.811212.1953.9695454.2459.4459.57/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.5630.50.562
6005S5.8166.1911.811212.1959.9696060.2465.4465.57/161/2
10S
40S0.3280.3750.4220.3750.437
80S0.4380.50.5630.50.562

8 Responses

  1. It’s great to know that rotating the lap joint flange on the pipe makes it easier to line up the bolt holes on the matching flanges. My husband is an industrial worker. He wants to acquire a piece of machinery for his project that can be utilized to fortify the tube’s end. I’ll advise him to acquire rotating tube beading for the pipe for his project.

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