Lap Joint Flanges
What are Lap Joint Flanges?
Lap Joint Flanges are two-piece pipe connection components consisting of a flange and a stub end. The flange slides freely over the pipe and is positioned behind the stub end, which is welded to the pipe. This design allows for easy alignment and rotation of the flange, making it ideal for piping systems that require frequent disassembly or realignment.
Asiad Steel Industries is a leading manufacturer and exporter of high-quality Lap Joint Flanges in stainless steel, carbon steel, and special alloys for diverse industries worldwide.
Key Features
- Two-Piece Design – Offers flexibility in bolt alignment and ease of maintenance.
- Ideal for Corrosive Media – Stub end material can differ from the flange to reduce corrosion costs.
- Reusable Flanges – Flanges are not welded and can be reused across multiple installations.
- Rotatable – Enables easy alignment of bolt holes during assembly.
- Standard Compliant – Manufactured as per ASME B16.5, EN 1092-1, and DIN standards.
Types of Lap Joint Flanges
- Raised Face Lap Joint Flanges
- Flat Face Lap Joint Flanges
- Stub End with Lap Joint Flange
- Custom Bore Lap Joint Flanges
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Description |
|---|---|
| Size Range | ½” to 24” (DN15 – DN600) |
| Pressure Class | ANSI 150#, 300#, 600# |
| Flange Face | RF (Raised Face), FF (Flat Face) |
| Standards | ASME B16.5, EN 1092-1, DIN 2641 |
| Materials (Flange) | CS, SS 304/316, Duplex, Alloy Steel |
| Materials (Stub End) | SS 304/316, Alloy 20, Inconel, Hastelloy |
| Manufacturing | Forged, Heat Treated, CNC Machined |
| Property | Value |
|---|---|
| Tensile Strength | 485 – 700 MPa |
| Yield Strength | 240 – 450 MPa |
| Elongation | 20% – 30% |
| Hardness | 120 – 250 HB |
| Operating Temp | -29°C to +550°C |
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 – 0.25 |
| Manganese | 0.60 – 1.65 |
| Silicon (Si) | 0.15 – 0.60 |
| Chromium | 17.0 – 20.0 (SS) |
| Nickel | 8.0 – 10.5 (SS) |
| Molybdenum | 2.0 – 3.0 (in F316) |
| Phosphorus | ≤ 0.035 |
| Sulfur | ≤ 0.030 |
| Standard | Equivalent Grade |
|---|---|
| ASTM | A182 F304/F316 (SS), A105 (CS) |
| EN | 1.4301, 1.4401, 1.4571 |
| DIN | C22.8, X5CrNi18-10 |
| JIS | SUS304, SUS316 |
| Size (inches) | Pressure Class | Approx Weight (kg) |
|---|---|---|
| 1” | 150# | 1.15 kg |
| 2” | 150# | 2.85 kg |
| 3” | 300# | 6.20 kg |
| 4” | 600# | 10.50 kg |
| 6” | 150# | 14.80 kg |
Applications of Lap Joint Flanges
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
Why choose a Lap Joint Flange over other types?
Lap Joint Flanges are preferred for applications requiring frequent disassembly, easy alignment, or where stub ends are made from corrosion-resistant materials.
Can Lap Joint Flanges handle high-pressure environments?
They are best suited for low to medium-pressure applications. For high-pressure systems, weld neck or socket weld flanges are recommended.
Are Lap Joint Flanges reusable?
Yes. Since the flange isn’t welded, it can be reused with new stub ends or in different piping assemblies.
Do you offer stub ends along with the flanges?
Absolutely. We provide a complete set – stub end and Lap Joint Flange – in matching or different materials based on your project requirements.
