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Phone Number : 0086-21-31261985
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MSS SP-43 Stainless Steel Stub Ends Short Pattern Lap Joint 316L

  • MSS SP-43 Stainless Steel Stub Ends Short Pattern Lap Joint 316L
  • MSS SP-43 Stainless Steel Stub Ends Short Pattern Lap Joint 316L
  • MSS SP-43 Stainless Steel Stub Ends Short Pattern Lap Joint 316L
  • MSS SP-43 Stainless Steel Stub Ends Short Pattern Lap Joint 316L
  • MSS SP-43 Stainless Steel Stub Ends Short Pattern Lap Joint 316L
Place of Origin Shanghai,China
Brand Name TOBO
Certification ISO/TUV/SGS
Model Number Stainless Steel Stub Ends
Minimum Order Quantity 1PC
Price Negotiable
Packaging Details Standard Shipping Package
Delivery Time 15-30 Workdays
Payment Terms T/T, Western Union
Supply Ability 10 Ton/Month
Product Details
Product Name MSS SP-43 Stainless Steel Stub Ends Short Pattern Lap Joint 316L Standard ASME B16.9 / MSS SP-43
Material Grrade UNSS31803 Email Andyhuang@cnjdgy.com
Corrosion Resistance Excellent Ends Beveled, Plain
Surface Pickling Solution Material Stainless Steel (commonly SS304, SS316, SS316L)
Technics Cold Formed Model Numb 1/2
Pressure Class 150#, 300#, 600#, 900#, 1500#, 2500# Endtype Butt Weld End
Packing Wooden Case Standards ASME B16.9, MSS SP-43
Types Seamless Form Long Radius, Short Radius, Reducing
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Product Description

MSS SP-43 Stainless Steel Stub Ends Short Pattern Lap Joint 316L

 

1.Product Description

Stainless Steel Stub Ends (also known as lap joint stub ends) are pipe fittings that convert pipe ends into flanged connection faces. They consist of a straight pipe section and a flared lap at one end. The lap face serves as the sealing surface, while the back shoulder bears the fastening load from the lap joint flange. The product does not include a flange and must be paired with Lap Joint Flanges. Materials include 304/304L, 316/316L, duplex stainless steel, and nickel-based alloys. Based on the back contour, they are classified as Type A (straight neck transition), Type B (curved transition), and Type C (forged thickened), suitable for different pressure classes and wall thickness requirements. They offer an economical and flexible connection solution for piping systems.

2.Product Applications

  1. Used with Lap Joint Flanges to form complete flanged connection assemblies for various steel piping systems.

  2. Corrosive media transmission lines: The stub end contacts the media with stainless steel, while the flange ring can be carbon steel, enabling zoned material selection.

  3. Large-diameter piping systems: The independently rotating flange ring solves alignment difficulties where rotating large-diameter pipes is impractical.

  4. Pipe sections requiring regular maintenance: Such as pump suction lines, heat exchanger channels, and reactor discharge nozzles that require frequent cleaning.

  5. Lines subject to vibration or thermal displacement: The fit clearance dampens vibration and absorbs minor axial thermal expansion.

  6. Key downstream sectors: Petroleum refining, offshore engineering, natural gas processing, food processing, semiconductors, and air separation units.

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​3.Product Advantages

Comparison Dimension SS Stub End + Lap Joint Flange Traditional Weld Neck Flange (Integral)
Material Cost Only the stub end uses SS; the flange ring can be CS, offering significant savings Entire flange is SS; very costly in large diameters
Installation Ease Flange ring rotates freely; bolt alignment is easy; one worker can do it Requires rotating the entire flange or pipe; difficult installation
Maintenance/Disassembly Loosen bolts to separate; no hot work required Requires cutting off welded flange; difficult and not reusable
Number of Welds Only 1 butt weld required Requires 2 fillet welds (flange neck to pipe)
Stress Distribution Weld is far from sealing face; thermal stresses do not overlap Weld is adjacent to flange neck; higher stress concentration risk
Nozzle Loads No bending moment transmitted; protects equipment nozzles Rigid connection; pipe bending moment transfers directly to equipment
Spare Parts Commonality Flange rings are interchangeable across materials; fewer spare part types Each material and size is dedicated; complex spare parts inventory

 

 

MSS SP-43 Stainless Steel Stub Ends Short Pattern Lap Joint 316L

4.Key Technical Specifications

Parameter Specification Details
Applicable Standards ASME B16.9 / B16.28, MSS SP-43, DIN 2616 / EN 12560, JIS B2311, GB/T 12459
Common Materials 304/304L, 316/316L, 321, 347, Duplex S31803/S32205, 904L, Alloy 625, etc.
Size Coverage Seamless: DN15～DN600; Welded: DN15～DN1800
Wall Thickness Schedules Sch 5S, Sch 10S, Sch 20S, Sch 40S, Sch 80S, Sch 160, STD, XS, XXS
Pressure Class Match Class 150 ～ Class 2500 (depending on mating flange rating)
Lap Type Selection Long Pattern (longer straight neck, for Sch 40S and above); Short Pattern (compact, for Sch 5S/10S thin-wall)
Lap Structure Type Type A (with straight neck transition), Type B (curved transition, no straight neck), Type C (integral forged thickened)
Sealing Face Finish Concentric or spiral serrations, Ra ≤ 6.3μm; Precision grade Ra ≤ 3.2μm
Bevel Form Butt-weld end per ASME B16.25, V or U bevel, angle 30°～37.5°
Recommended Mating Flange Lap Joint Flange, available in carbon steel, galvanized carbon steel, or SS matching the stub end
Factory Inspections Full dimensional inspection, visual inspection; PT/MT dye penetrant; RT sampling (welded type); intergranular corrosion testing (as required)

FAQ

1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.

2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.

4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.

Tags:

Stub End Fittings

Lap Joint Stub End

SS Stub End