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Type A Stainless Steel Butt Weld Lap Joint Flanges Stub Ends custom

Type A Stainless Steel Butt Weld Lap Joint Flanges Stub Ends Manufacturers

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Precision Stainless Steel Stub Ends

In piping systems that require frequent disassembly for cleaning or inspection, the combination of a stub end and a lap joint flange is the preferred engineering solution. Our Type A Stainless Steel Butt Weld Stub Ends are manufactured to provide a high-integrity flared face that works in conjunction with a backing flange. As a specialized manufacturer, we offer Type A stub ends with a radiused corner that perfectly matches the bore of the lap joint flange. These components are cold-formed or forged from premium 304L or 316L stainless steel, ensuring that the wetted surface is entirely corrosion-resistant. The butt-weld end is precision-beveled for a seamless transition to the pipe, while the lap face is machine-finished to ensure a leak-proof seal with the gasket. This configuration allows for the use of lower-cost carbon steel flanges on the exterior, significantly reducing the total cost of stainless steel piping systems.

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Stub End Specification Details

Parameter Type A Specification Detail
Material Grades ASTM A403 WP316L, WP304L, WP321
Manufacturing Standard ASME B16.9, MSS SP-43
Configuration Type A (Long Pattern and Short Pattern)
Size Range 1/2" to 24" (DN15 - DN600)
Wall Thickness Schedule 10S, 40S, 80S
Face Finish Stock Finish, Smooth Finish (125-250 AARH)

Versatile Modular Piping Applications

Type A stub ends are the industry standard for modular piping systems in the chemical and food processing industries where sections of the pipe must be regularly rotated or removed. They are essential in brewery and dairy pipelines to facilitate Clean-In-Place (CIP) inspections. In the water treatment sector, they allow for the easy replacement of valves and specialized equipment without the need for extensive field welding. They are also widely used in large-diameter industrial ducting and process exhausts. Because the backing flange can rotate freely, these stub ends are ideal for applications where bolt-hole alignment is difficult, such as on large skid-mounted equipment or in cramped offshore platform environments. Any system utilizing exotic materials like 316L or Nickel alloys often uses stub ends to save on flange costs.

Design & Cost Advantages

  • Significant Cost Savings: Allows the use of carbon steel backing flanges while only the wetted stub end is made of expensive stainless steel.
  • Easy Installation: The free-rotating flange simplifies bolt-hole alignment, speeding up site assembly and maintenance.
  • High Salvage Value: Flanges can be easily reused or replaced without cutting the stainless steel pipe.
  • Reliable Sealing: The machine-finished lap face provides a consistent surface for gaskets, ensuring a tight seal under pressure.

Commercial Support & Shipping

We accept payments via T/T, PayPal, and Irrevocable L/C. Since the lap face finish is critical for sealing, we apply protective plastic caps to every stub end to prevent damage during transit. We offer both short and long patterns (per ASME B16.9) from stock for common sizes. Small orders are shipped via express courier, while bulk orders are packed in seaworthy plywood cases. Every shipment includes a 3.1 Mill Test Certificate ensuring compliance with material and dimensional standards. Our technical team can assist you in selecting the correct stub end pattern (Type A, B, or C) for your specific flange type. We prioritize rapid lead times to support your maintenance schedules and project deadlines.

  • Q: What is the difference between Type A and Type B stub ends?
  • A: Type A is designed to work specifically with standard lap joint flanges and has a radiused corner. Type B is intended for use with standard slip-on flanges acting as lap joint flanges.
  • Q: Do you offer "Short Pattern" stub ends?
  • A: Yes, we manufacture both Long Pattern (standard) and Short Pattern (MSS SP-43) stub ends to accommodate different space requirements in your piping layout.
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Jiangyin Gaoxin Pipe Fittings Co., Ltd.
About Us
JIANGYIN GAOXIN PIPE FITTINGS CO.,LTD.
Our company is a professional manufacturer of pressure piping components. As Type A Stainless Steel Butt Weld Lap Joint Flanges Stub Ends Manufacturers，Our product range covers butt-weld, socket-weld, and threaded pipe fittings, including flanges and customized non-standard parts. These products are widely used in industries such as oil & gas, chemical processing, power generation, shipbuilding, papermaking, metallurgy, pharmaceuticals, and food processing. We manufacture according to standards such as ASME, EN,JIS,DIN,ANSI,GOST, MSS, GB/T,HG, DL, SH, SY,and have a complete range of inspection equipment, a strict quality control system, and various certifications（PED,AD2000,EAC, ABS,BV, DNV,NORSOK M650, ISO9001,ISO14001,ISO45001,etc.）, making us a leader in the industry.

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