OEM manufacturer ASME B16.9 · MSS SP-43 · ASME B16.25
Stub Ends — Long Pattern (ASME B16.9) & Short Pattern (MSS SP-43)
A stub end is a short pipe piece with a flared lap on one end, used with a lap joint flange to make a flanged joint that can be rotated and dismantled. Teshi Group manufactures long pattern stub ends to ASME B16.9 and short pattern stub ends to MSS SP-43, mainly in stainless steel, and supplies the matching lap joint flanges.
Also called: lap joint stub end, lap joint stub, stub end long pattern, stub end short pattern, MSS stub end, ASA stub end
What is a Stub End?
A stub end is butt welded to the pipe; a loose lap joint flange slides over it and the lap face carries the gasket. Only the stub end touches the process fluid, so the flange can be in carbon steel while the stub end is in stainless or alloy — a cost saving in corrosive service. Long pattern (ASA) stub ends follow ASME B16.9 lengths; short pattern (MSS) stub ends follow MSS SP-43, which covers stainless steel butt-welding fittings for Sch 5S and 10S pipe (its stub ends are also made for Sch 40S), Type A (for lap joint flanges) and Type B (for use with slip-on flanges).
Key features
- Long pattern to ASME B16.9 and short pattern to MSS SP-43
- MSS SP-43 Type A (lap joint flange) and Type B (slip-on flange backing)
- Lets a carbon steel backing flange be used with a stainless or alloy line
- Flange can be rotated to align bolt holes during erection
- Lap face finished for the specified gasket
Specification
| Supply | OEM manufacturer — Teshi Group, India |
|---|---|
| Standards | ASME B16.9 (long pattern); MSS SP-43 (short pattern, NPS ½"–24") |
| Types | Type A for lap joint flanges; Type B for slip-on backing flanges |
| Wall thickness | Matched to the pipe — Sch 5S, 10S, 40S, 80S and others as specified |
| Materials — carbon steel | ASTM A234 WPB, WPC (seamless and welded WPB-W) |
| Materials — high-yield carbon steel | ASTM A860 WPHY 42, 46, 52, 56, 60, 65, 70 (MSS SP-75) |
| Materials — low-temperature carbon steel | ASTM A420 WPL3, WPL6, WPL8, WPL9 |
| Materials — alloy steel (Cr-Mo) | ASTM A234 WP1, WP5, WP9, WP11 Cl 1 / 2 / 3, WP12 Cl 1 / 2, WP22 Cl 1 / 3, WP91, WP92 |
| Materials — stainless steel | ASTM A403 WP304, WP304L, WP304H, WP309, WP310S, WP316, WP316L, WP316H, WP316Ti, WP317, WP317L, WP321, WP321H, WP347, WP347H (seamless S, welded W / WX) |
| Materials — 904L and 6Mo | 904L (UNS N08904, ASTM A403 / B366); 254 SMO / 6Mo (ASTM A403 WPS31254); AL-6XN (UNS N08367, ASTM B366) |
| Materials — duplex stainless steel | ASTM A815 WPS31803, WPS32205 (2205) |
| Materials — super duplex stainless steel | ASTM A815 WPS32750 (2507), WPS32760, WPS32550 |
| Materials — nickel alloys | ASTM B366: Nickel 200 / 201 (N02200 / N02201), Monel 400 (N04400), Inconel 600 (N06600), Inconel 625 (N06625), Incoloy 800 / 800H / 800HT (N08800 / N08810 / N08811), Incoloy 825 (N08825), Hastelloy C276 (N10276), Hastelloy C22 (N06022), Hastelloy B2 / B3 (N10665 / N10675), Alloy 20 (N08020) |
| Materials — titanium | ASTM B363 WPT1, WPT2, WPT7, WPT12; Grade 5 (Ti-6Al-4V) against order |
| Materials — copper-nickel | Cu-Ni 90/10 (UNS C70600) and 70/30 (UNS C71500), made from ASTM B466 / B467 pipe (EEMUA 146 dimensions on request) |
| Grade availability | Every grade listed is made or supplied against order, with EN 10204 3.1 certificates (3.2 / third-party inspection when specified) and PMI on alloy, stainless, duplex and nickel grades. |
| Backing flanges | Lap joint flanges to ASME B16.5 in ASTM A105 or stainless |
| Ends | Bevelled for butt welding per ASME B16.25 |
| Testing | Visual and dimensional inspection; PMI on alloy and stainless grades; hardness check; RT, UT, MPI or DPT and IGC tests when specified |
| Documents | EN 10204 3.1 mill test certificate; 3.2 / third-party inspection when the order specifies; dimensional inspection report; IBR certification for boiler/steam service when specified |
Applications
- Stainless and duplex process piping in chemical plants
- Water treatment and desalination piping
- Food, pharma and pulp & paper lines
- Lines that need frequent dismantling for cleaning or inspection
- Corrosive services using carbon steel backing flanges
Long pattern vs short pattern stub end
Long pattern (ASA) stub ends to ASME B16.9 have a longer body, giving more length between the lap and the butt weld to the pipe. Short pattern (MSS) stub ends to MSS SP-43 are shorter and lighter, mainly in Sch 5S and 10S stainless, and suit compact layouts. Both work with the same lap joint flange; the length must match the isometric.
Technical data sheets
Dimensions & weights
FAQ
Stub End: common questions
What is the difference between MSS and ASA stub ends?
MSS (short pattern) stub ends follow MSS SP-43 and are shorter. ASA (long pattern) stub ends follow ASME B16.9 lengths. The lap diameter is the same, so both fit the same lap joint flange.
What are Type A and Type B stub ends?
Type A is made for use with standard lap joint flanges. Type B is made for use with standard slip-on flanges as backing flanges. Both are covered by MSS SP-43.
Can I use a carbon steel flange with a stainless stub end?
Yes. The backing flange does not contact the fluid, so a carbon steel ASTM A105 lap joint flange is commonly used with a stainless steel stub end.
Do you supply 904L stub ends?
Yes. Stub ends in UNS N08904 (904L) are supplied in long and short pattern with EN 10204 3.1 certificates and PMI reports, together with backing lap joint flanges if required.
What do I need to send for a quotation?
Send size, schedule, pattern (long or short), type (A or B), material and quantity, and say whether backing flanges are needed. We quote within 24–48 hours.
Need a size or grade not listed here?
Our engineering team manufactures against your drawing or datasheet, with dimensional sign-off before dispatch.
Send us your specificationTraceability
From mill heat to your site
- 01
Approved mill material
Received against the mill certificate; heat number registered.
- 02
Forging & machining
Heat number carried through every stage in our Indian works.
- 03
PMI, dimensional & NDT
Every lot inspected to the governing standard; TPI witness on request.
- 04
Stamped & certified dispatch
Hard-stamped pieces with EN 10204 3.1 / 3.2 certificates.
Quick RFQ
Quote for Stub End in 24–48 hours
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