Lap Joint Stub End Supplier & Exporter in Colombo, Sri Lanka

ANSI B16.9 Stub Ends for Lap Joint Flanges – Stainless Steel, Carbon Steel, Alloy Grades

Prime Steel Corporation is a prominent supplier of Lap Joint Stub Ends for industrial piping systems across Colombo, with supply capabilities extended to Gampaha, Katunayake, Kandy, Trincomalee, Hambantota, and Jaffna. These fittings are engineered to work in combination with Lap Joint Flanges, allowing easy alignment and disassembly of piping sections, especially where space constraints or corrosion-resistant materials are a concern. The Lap Joint Stub End acts as a welded extension of the pipe, while the backing flange remains loose, enabling cost-effective flange reuse and reducing material wastage in high-alloy systems. Ideal for low-pressure, non-critical, or frequently dismantled systems, they are widely used in chemical processing, water treatment, pharmaceuticals, oil & gas, and marine applications. All our Lap Joint Stub Ends are manufactured according to ASME B16.9 and MSS SP-43 standards, with stringent dimensional accuracy and metallurgical integrity.

Features of Lap Joint Stub Ends:

  • Designed for use with Lap Joint (Loose) Flanges
  • Offers rotational alignment and ease of disassembly
  • Reduces overall cost in high-alloy piping systems
  • Minimizes corrosion in flange areas as only the stub end contacts the fluid

Dimensional Range – Lap Joint Stub End Specifications:

  • Size Range: ½” NB to 24” NB
  • Wall Thickness: SCH 10S to SCH XXS
  • Stub End Types:
    • Type A – Suitable for standard lap joint flanges
    • Type B – Compatible with slip-on flanges
  • Face Finish: Standard machined finish for sealing with gasket
  • Ends: Beveled ends as per ASME B16.25

All sizes are available in Short Stub End and Long Stub End configurations.

Applicable Standards for Lap Joint Stub Ends:

  • ASME B16.9 – Factory-made wrought buttwelding fittings
  • MSS SP-43 – Light-weight stub ends for corrosion-resistant applications
  • DIN / EN Norms – For custom projects upon request

Material Grades Available:

  • Stainless Steel: A403 WP304, WP316, WP316L, WP321, WP904L
  • Carbon Steel: A234 WPB, WPC
  • Alloy Steel: A234 WP11, WP22, WP5
  • High Nickel Alloys: Inconel 600 / 625, Monel 400, Hastelloy C276, Alloy 20
  • Duplex & Super Duplex: UNS S31803, S32750, S32760

Each stub end is thoroughly tested for dimensional accuracy, pressure handling, and corrosion resistance.

Industries in Sri Lanka Using Lap Joint Stub Ends:

  • Desalination & Water Plants – Flanged joints for anti-corrosive pipelines
  • Pharmaceutical & Food Industry – Sanitary systems that require regular cleaning
  • Petrochemical Facilities – Corrosion-prone areas in low-pressure systems
  • Offshore & Marine Engineering – For easy maintenance of saltwater lines
  • Breweries & Dairy Plants – For hygienic and non-contaminating installations

Need a quote or have a technical query? Contact our export team at:
sales@primesteelcorp.com