The lap joint system splits the flange into two parts with two different jobs. The stub end provides the sealing face and the weld to the pipe. The backing flange provides the clamping force and the bolt holes — and because it never touches the medium and never gets welded, it can be carbon steel even on a stainless line, and it can spin freely to line up with the mating flange. Our catalogue includes a long-pattern stub end execution: 2 inch, 150 lb, flat face (125–250 AARH finish) in the EEMUA 146 pattern, Wrought S 90 Cu/10 Ni, THK 3 wall.
Stub ends are ordered by size, schedule (which sets the wall at the weld end), pattern (long or short) and material — each confirmed for the specific product at enquiry.
| Item | Range / Options |
|---|---|
| Types | Long pattern stub ends (catalogue example below) |
| Catalogue example | Long-pattern stub end, 2 inch, 150 lb, flat face (125–250 AARH), EEMUA 146 pattern, Wrought S 90 Cu/10 Ni, THK 3 |
| Size range | Confirmed per product at enquiry |
| Wall thickness | Confirmed per product at enquiry — state the schedule of the connecting pipe on the enquiry |
| Materials | The material of the pipe the stub end is welded to; the grade is confirmed per product at enquiry |
| Partner part | Lap joint (loose) backing flanges — see flange range |
Why Buyers Choose Stub Ends
- Material saving on alloy lines — only the stub end needs the expensive grade; the loose flange can be carbon steel.
- Alignment — the backing flange rotates, so bolt holes line up without twisting the pipe.
- Dismantling — joints can be broken and remade for cleaning or inspection without cutting welds.
- Face replacement — a damaged sealing face means replacing a stub end, not a length of pipe.
Long or Short Pattern?
Long pattern stub ends are the standard choice and match standard lap joint flanges. Short pattern stub ends have a shorter lap and are used with specific flange types and in tight assemblies. If the drawing does not say, long pattern is the safe default — and the matching lap joint flange must be ordered for the same size and class.
Made With the Line
Stub ends are welded fittings, so they are normally ordered together with the other fittings of the line they serve. State the pipe schedule on the enquiry: the stub end wall and bevel for a specific product are confirmed against that schedule before order. The catalogue example on this page is the long-pattern 2 inch, 150 lb, flat face execution in the EEMUA 146 pattern, in Wrought S 90 Cu/10 Ni at THK 3.
Frequently Asked Questions
Do stub ends come with the lap joint flange included?
They are separate parts and are priced separately, but they should be ordered together so sizes, class and lap pattern match. Say on the enquiry whether you need stub ends only, flanges only, or the pair.
Which material should the stub end be?
The pipe material — the stub end is welded to the pipe and its flare forms the sealing face, so its grade follows the pipe; the grade for a specific product is confirmed at enquiry. The backing flange, which touches nothing, is the part that can be a lower-cost grade.
What standard governs stub end dimensions?
State the pattern standard your specification calls up on the enquiry. The stub end and its mating lap joint flange are confirmed together for the specific product, so lap length, flare diameter and pattern match as a pair.
Related Products
Butt Weld Elbows
Elbow executions in A234 WPB and A403 WP304L, each listed on its own page.
Send Your Specification
Tell us the size, schedule or pressure class, material grade and quantity for the stub ends you need. MOQ and lead time are confirmed in the quotation for your exact specification.