TOBO STEEL GROUP CHINA
| Surface | Pickling Solution |
| Standards | ASME B16.9, MSS SP-43 |
| Payment Terms | T/T, Western Union |
| Standard | ASME B16.9 / MSS SP-43 |
| Corrosion Resistance | Excellent |
| Material Grrade | UNSS31803 |
| Supply Ability | 10 Ton/Month |
| Product Name | MSS SP-43 Stainless Steel Stub Ends Short Pattern Lap Joint 316L |
| Material | Stainless Steel (commonly SS304, SS316, SS316L) |
| Delivery Time | 15-30 Workdays |
| Ends | Beveled, Plain |
| Types | Seamless |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Packaging Details | Standard Shipping Package |
| Endtype | Butt Weld End |
| Packing | Wooden case |
| andyhuang@cnjdgy.com | |
| Form | Long Radius, Short Radius, Reducing |
| Technics | cold formed |
| Model Numb | 1/2 |
| Model Number | Stainless Steel Stub Ends |
| Brand Name | TOBO |
| Certification | ISO/TUV/SGS |
| Place of Origin | Shanghai,China |
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Product Specification
| Surface | Pickling Solution | Standards | ASME B16.9, MSS SP-43 |
| Payment Terms | T/T, Western Union | Standard | ASME B16.9 / MSS SP-43 |
| Corrosion Resistance | Excellent | Material Grrade | UNSS31803 |
| Supply Ability | 10 Ton/Month | Product Name | MSS SP-43 Stainless Steel Stub Ends Short Pattern Lap Joint 316L |
| Material | Stainless Steel (commonly SS304, SS316, SS316L) | Delivery Time | 15-30 Workdays |
| Ends | Beveled, Plain | Types | Seamless |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# | Packaging Details | Standard Shipping Package |
| Endtype | Butt Weld End | Packing | Wooden case |
| andyhuang@cnjdgy.com | Form | Long Radius, Short Radius, Reducing | |
| Technics | cold formed | Model Numb | 1/2 |
| Model Number | Stainless Steel Stub Ends | Brand Name | TOBO |
| Certification | ISO/TUV/SGS | Place of Origin | Shanghai,China |
| High Light | MSS SP-43 stainless steel stub ends ，316L lap joint stub ends ，short pattern stainless stub ends | ||
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
Used with Lap Joint Flanges to form complete flanged connection assemblies for various steel piping systems.
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.
Large-diameter piping systems: The independently rotating flange ring solves alignment difficulties where rotating large-diameter pipes is impractical.
Pipe sections requiring regular maintenance: Such as pump suction lines, heat exchanger channels, and reactor discharge nozzles that require frequent cleaning.
Lines subject to vibration or thermal displacement: The fit clearance dampens vibration and absorbs minor axial thermal expansion.
Key downstream sectors: Petroleum refining, offshore engineering, natural gas processing, food processing, semiconductors, and air separation units.
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 |
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.
Company Details
Business Type:
Manufacturer,Agent,Importer,Exporter,Trading Company,Seller
Year Established:
1998
Total Annual:
100000-100000000
Employee Number:
200~300
Ecer Certification：
Verified Supplier
TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ... TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ...
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