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Product Overview
A Lap Joint Flange (LJ Flange) is used together with a Stub End to create a flanged connection. Unlike other flanges, the flange itself is not welded directly to the pipe. Instead, the stub end is welded to the pipe while the flange rotates freely around it. This design makes alignment of bolt holes simple and allows easy removal of piping components for maintenance or inspection.
At Moksh Tubes & Fittings LLP, we manufacture precision-engineered Lap Joint Flanges using high-quality forged materials and advanced CNC machining technology. Our flanges are available in a wide range of sizes, pressure classes, and material grades, making them suitable for corrosive environments, process piping, and systems that require regular maintenance.
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Specifications
| Specification | Details |
|---|---|
| Product | Lap Joint Flange |
| Standards | ASME B16.5, ASME B16.47, EN 1092-1, DIN, BS, JIS |
| Material | Stainless Steel, Carbon Steel, Alloy Steel, Duplex, Super Duplex, Nickel Alloys & Titanium |
| Size Range | ½" NB to 60" NB |
| Pressure Class | Class 150, 300, 600, 900, 1500 & 2500 |
| Facing Type | Raised Face (RF) & Flat Face (FF) |
| End | Used with Stub End |
| Surface Finish | Machined, Pickled, Polished or Anti-Rust Coated |
| Manufacturing | Forged & CNC Machined |
Size & Weight Chart
Lap Joint Flanges are manufactured in accordance with ASME B16.5 and ASME B16.47 standards and are available in a wide range of nominal pipe sizes and pressure classes.
| Nominal Pipe Size (NB) | Pressure Class | Outside Diameter (mm) | Thickness (mm) | Approx. Weight (kg) |
|---|---|---|---|---|
| ½" | 150 | 90 | 11 | 0.50 |
| ¾" | 150 | 100 | 12 | 0.70 |
| 1" | 150 | 108 | 14 | 0.95 |
| 1½" | 150 | 127 | 16 | 1.60 |
| 2" | 150 | 152 | 19 | 2.50 |
| 3" | 150 | 191 | 24 | 4.70 |
| 4" | 150 | 229 | 24 | 7.10 |
| 6" | 150 | 279 | 27 | 12.40 |
| 8" | 150 | 343 | 30 | 20.10 |
| 10" | 150 | 406 | 32 | 30.90 |
| 12" | 150 | 483 | 35 | 46.30 |
| 16" | 150 | 597 | 38 | 77.20 |
| 20" | 150 | 711 | 43 | 125.60 |
| 24" | 150 | 813 | 48 | 185.80 |
Note: Dimensions and weights are approximate and may vary depending on the pressure class (Class 150–2500), material grade, and ASME B16.5/B16.47 requirements. Custom sizes and specifications are available upon request.
Grades & Equivalent
Stainless Steel Grades
304 / 304L, 316 / 316L
Carbon & Alloy Steel
Carbon Steel ASTM A105,
Low Temp A350 LF2, Alloy A182
F11/F22/F91
Duplex & Super Duplex
UNS S31803 / S32205
UNS S32750 / S32760
High-Performance Alloys
Inconel®, Monel®, Hastelloy® & Titanium Grade 2
Applications
Lap Joint Flanges are widely used in:
Oil & Gas Pipelines
Petrochemical Plants
Chemical Processing Industries
Water & Wastewater Treatment
Pharmaceutical Industry
Food & Beverage Processing
Marine & Offshore Applications
Industrial Process Piping
Power Generation Plants
Features & Advantages
Rotating flange for easy bolt hole alignment
Simplifies installation and maintenance
Used with stub ends for flexible piping connections
Excellent corrosion and oxidation resistance
High mechanical strength and durability
Ideal for systems requiring frequent dismantling
Cost-effective solution for expensive alloy piping
Precision-machined sealing surface
Manufactured according to international quality standards
Mechanical Properties
The mechanical properties of Lap Joint Flanges depend on the selected material grade and comply with applicable ASTM and ASME standards. The table below shows the typical mechanical properties for commonly supplied stainless steel grades.
| Property | SS 304 / 304L | SS 316 / 316L |
|---|---|---|
| Tensile Strength (MPa) | 515 Min | 515 Min |
| Yield Strength (MPa) | 205 Min | 205 Min |
| Elongation (%) | 40 Min | 40 Min |
| Hardness (HB Max) | 201 | 217 |
Note: Mechanical properties for Carbon Steel, Alloy Steel, Duplex, Super Duplex, Nickel Alloy, and Titanium Lap Joint Flanges are available in accordance with their respective ASTM/ASME material specifications upon request.
Why Choose Moksh Tubes & Fittings LLP?
Frequently Asked Questions (FAQ)
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Looking for a trusted Lap Joint Flanges manufacturer and supplier? Contact Moksh Tubes & Fittings LLP for premium-quality forged lap joint flanges, competitive pricing, ready stock, technical support, and fast worldwide delivery. Request your free quotation today.
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