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Lap Joint Flange Matching Stub End | Quick Disassembly

Lap joint stub end is a supporting pipe fitting used with lap joint flanges. It is welded to the pipe end, with the flange loosely sleeved behind the stub shoulder, enabling fast bolt hole alignment and frequent disassembly, ideal for pipelines requiring regular maintenance.

Built to ASME B16.9 standards, our lap joint stub ends are available in carbon steel for general piping and corrosion-resistant stainless steel variants, with customizable sizes and wall thicknesses to fit project requirements.

Core Advantages of Pengrun Lap Joint Stub End

Exclusive for lap joint flanges

Quick alignment & easy disassembly

Flexible material mix, cost-saving

Smooth bore, low flow loss

Multiple Materials Options

ASME B16.9 compliant

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    Main Classification

    • By form: Standard length stub end, short length stub end
    • By material: Carbon steel stub end, stainless steel stub end, alloy steel stub end
    • By matching flange: Compatible with Class150~Class600 lap joint flanges

    Application Limits

    Suitable for medium-low pressure pipelines with frequent disassembly. Not recommended for high-temperature, high-pressure or severe erosion working conditions; the flange only provides clamping force and does not contact the medium.

    Comparison Table
    Lap Joint Stub End Assembly VS Integral Weld Neck Flange

    Item Lap Joint Stub End + Loose Flange Integral Weld Neck Flange
    Installation Rotatable flange, easy bolt alignment Fixed flange, precise alignment required
    Disassembly Quick removal without cutting pipe Must cut weld to remove
    Cost Mixed material available, lower total cost Integral structure, higher cost
    Pressure rating Medium-low pressure (Class150~Class600) Full range up to Class2500
    Typical scenario Frequent maintenance piping Permanent high-pressure critical lines

    FAQs

    What flange does a lap joint stub end match with?

     It is exclusively used with lap joint flanges; the flange sleeves on the pipe behind the stub end shoulder.

    Why choose stainless stub end with carbon steel flange?

    Only the stub end contacts the medium; this combination ensures corrosion resistance while greatly reducing project cost.

    What pressure rating can it support?

    Normally Class150 to Class600, suitable for medium-low pressure pipeline systems.

    Can you customize stub end sizes and wall thicknesses?

    Yes, custom sizes DN15–DN600 and various wall schedules are available per requirements.

    Is lap joint stub end suitable for high temperature steam lines?

    Not recommended. The loose structure may cause sealing failure under continuous high temperature; weld neck flange is preferred.

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