Long Stub End
What is a Long Stub End?
A Long Stub End is a type of buttweld fitting used in conjunction with lap joint flanges. It consists of a short piece of pipe with a flared end that sits inside a lap joint flange. Only the stub end is in contact with the fluid, while the flange provides mechanical strength. This makes it highly economical in corrosive environments, as the flange can be carbon steel while the stub end is stainless or alloy.
Long stub ends are commonly used in food processing, chemical handling, water treatment, and marine systems where frequent flange disassembly is required.
Key Features
- Enables Easy Disassembly – No need to remove welds during maintenance.
- Cost-Effective Design – Only stub end requires corrosion resistance.
- Pattern Options – Available in long and short styles.
- Lap Joint Compatible – Works seamlessly with lap joint flanges.
- Perfect for Temporary Joints – Ideal for non-permanent connections.
Types of Stub Ends
- Long Pattern Stub End (Type A & B)
- Short Pattern Stub End
- Custom Dimensions Available
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Details |
|---|---|
| Sizes | ½" to 24" (DN15 – DN600) |
| Wall Thickness | SCH 10 to SCH XXS |
| Material Options | SS 304/316, Duplex, Alloy Steel, CS (for flange) |
| Standards | ASME B16.9, MSS-SP-43, DIN 2642 |
| Manufacturing | Seamless / Welded, Machined Ends |
| Property | Typical Value |
|---|---|
| Tensile Strength | 485 – 750 MPa |
| Yield Strength | 205 – 450 MPa |
| Elongation | ≥ 20% |
| Hardness | 120 – 250 HB |
| Temperature Range | -46°C to +650°C |
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 – 0.35 |
| Manganese (Mn) | 0.60 – 1.65 |
| Silicon (Si) | 0.15 – 0.80 |
| Chromium (Cr) | 16.0 – 20.0 |
| Nickel (Ni) | 8.0 – 14.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Iron (Fe) | Balance |
| Standard | Equivalent Grades |
|---|---|
| ASTM | A403 WP304/316 (SS), A815 UNS S31803/S32750 |
| ASME | B16.9, B16.5 (for lap joint compatibility) |
| MSS-SP | SP-43 |
| DIN | 2642 |
| EN | EN 1092-1 (for flange compatibility) |
| Stub End Type | Size (inches) | Weight per 100 pcs (kg) |
|---|---|---|
| Long Stub End | 2" | 95 |
| Long Stub End | 4" | 160 |
| Long Stub End | 6" | 220 |
Applications of Long Stub End
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is the benefit of using a long stub end with a lap joint flange?
It offers cost efficiency and flexibility—only the stub end contacts the fluid, while the flange can be carbon steel.
Are both long and short stub ends available?
Yes, we supply long pattern (Type A/B) and short pattern stub ends.
Are stub ends used in high-pressure systems?
Yes, when paired with compatible flanges and schedules, they perform reliably in high-pressure applications.
Can stub ends be custom-machined?
Absolutely. We provide stub ends with custom bevels, face types, and lengths.
