TOBO STEEL GROUP CHINA
| Delivery Time | 15-30 Workdays |
| Grade | 304, 316, 316L |
| Type | Butt Weld |
| Shape | Lapped |
| Connectiontype | Welded |
| Payment Terms | T/T, Western Union |
| Certifications | ISO 9001, CE, API |
| Form | Long Radius, Short Radius, Reducing |
| Port | Shanghai, Tianjin, Qingdao |
| Supply Ability | 10 Ton/Month |
| Product Name | Stainless Steel Stub Ends 304/316L Butt Weld Fittings ASME B16.9 |
| Material Grrade | UNSS31803 |
| Productname | Stainless Steel Stub Ends |
| Color | Sliver |
| Outer Diameter | 6-813mm |
| Material Grade | 904L |
| Lead Time | 7-15 Days |
| Packaging Details | Standard Shipping Package |
| Manufacturing Process | Forging, Casting, Etc. |
| Types | Seamless |
| Model Number | Stainless Steel Stub Ends |
| Brand Name | TOBO |
| Certification | ISO/TUV/SGS |
| Place of Origin | Shanghai,China |
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Product Specification
| Delivery Time | 15-30 Workdays | Grade | 304, 316, 316L |
| Type | Butt Weld | Shape | Lapped |
| Connectiontype | Welded | Payment Terms | T/T, Western Union |
| Certifications | ISO 9001, CE, API | Form | Long Radius, Short Radius, Reducing |
| Port | Shanghai, Tianjin, Qingdao | Supply Ability | 10 Ton/Month |
| Product Name | Stainless Steel Stub Ends 304/316L Butt Weld Fittings ASME B16.9 | Material Grrade | UNSS31803 |
| Productname | Stainless Steel Stub Ends | Color | Sliver |
| Outer Diameter | 6-813mm | Material Grade | 904L |
| Lead Time | 7-15 Days | Packaging Details | Standard Shipping Package |
| Manufacturing Process | Forging, Casting, Etc. | Types | Seamless |
| Model Number | Stainless Steel Stub Ends | Brand Name | TOBO |
| Certification | ISO/TUV/SGS | Place of Origin | Shanghai,China |
| High Light | Stainless Steel Stub Ends 304/316L ，Butt Weld Stub Ends ASME B16.9 ，316L Stainless Steel Stub Ends | ||
Stainless Steel Stub Ends 304/316L Butt Weld Fittings ASME B16.9
1.Product Description
Stainless Steel Stub Ends are pipe fittings used for pipe termination connections. One end is flared to form a sealing face, and they are used together with Lap Joint Flanges to form detachable flanged connections. Made of high-quality stainless steel grades such as 304/304L and 316/316L, they are available in seamless or welded forms. Structurally divided into Long Stub Ends and Short Stub Ends, they comply with ASME, DIN, and JIS standards to meet global piping project requirements.
2.Product Applications
Used with Lap Joint Flanges for flanged connections in piping systems.
Suitable for pipe sections requiring frequent disassembly for cleaning, inspection, or replacement.
Used for corrosive media transport – the stub end is made of stainless steel while the flange ring can be carbon steel to reduce costs.
Particularly suitable for large-diameter pipelines, as the lap joint flange rotates freely for easy bolt hole alignment.
Widely used in petrochemical, natural gas, pharmaceutical, food and beverage, shipbuilding, and vacuum systems industries.
3.Product Advantages
Excellent Corrosion Resistance: Stainless steel provides outstanding durability in acid, alkali, salt, and humid environments. 316/316L offers enhanced resistance due to molybdenum content.
Significant Cost Savings: Only the stub end requires stainless steel; the mating flange ring can be carbon steel. Cost advantages are particularly notable in large-diameter, high-pressure applications.
Time- and Labor-Saving Installation: The lap joint flange rotates freely, allowing bolt alignment without rotating the pipe. A single worker can complete the task.
Efficient and Convenient Maintenance: Disconnecting the flange exposes the pipe opening. Cleaning, inspection, or pipe replacement requires no hot work or cutting.
Stress-Isolation Design: The weld is located away from the lap sealing area. Welding heat effects and pipe vibration do not directly act on the sealing face, ensuring high connection reliability.
Full Range of Specifications: Available in seamless and welded processes, covering sizes from DN15 to DN1200 and above, meeting diverse engineering selection needs.
4.Key Technical Specifications
| Parameter | Specification Details |
| Manufacturing Standards | ASME B16.9 / B16.28, MSS SP-43, DIN 2616, JIS B2311, GB/T 12459 |
| Material Grades | ASTM A403 WP304/304L, WP316/316L, WP321, WP347, Duplex, 904L, etc. |
| Size Range (NPS) | Seamless DN15~DN600; Welded DN15~DN1200 (up to DN1800 max) |
| Wall Thickness Schedules | Sch 5S, 10S, 20S, 40S, 80S, STD, XS, XXS |
| Pressure Rating Match | Class 150 ~ Class 2500 / PN 6 ~ PN 400 |
| Lap Type | Long Stub End, Short Stub End |
| Structure Classification | Type A (straight neck), Type B (curved transition), Type C (forged thickened) |
| Sealing Face Finish | Ra ≤ 6.3μm (standard); Ra ≤ 3.2μm (precision-finish grade) |
| End Type | Butt-weld end, beveled per ASME B16.25 |
| Surface Treatment | Pickling & passivation, mechanical polishing, electro-polishing |
| Inspection Methods | Dimensional inspection, PT/MT/RT non-destructive testing, hardness testing, 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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