FAQs of Stainless Steel Tee joint

1. How to choose the materials for stainless steel tee joints?

304 material contains chromium 18%-20%, nickel 8%-12%. Neutral medium corrosion resistance, suitable for normal temperature tap water, residential water supply, drainage, and other conventional scenarios. Cost-effective;316L molybdenum 2%-3%, acid and alkali resistance, and chloride ion resistance is stronger. High temperature resistance ≤450℃, suitable for coastal high salt fog environment, chemical industry park, and commercial high temperature drainage system. Plumberstar can provide suggestions for selection according to specific scenarios.

2. How is the machining accuracy of the inner wall of the joint?

The inner wall is manufactured using a CNC turning + precision polishing process, achieving a surface roughness of Ra ≤ 0.8 μm. The surface is free from burrs, pits, or uneven defects, resulting in 15% lower flow resistance than the industry average. Plumberstar optimizes the internal structure based on fluid mechanics analysis. Ensuring smooth media flow and effectively reducing fouling and deposition risks. Production is carried out on CNC machining centers with a positioning accuracy of ±0.005 mm and repeat positioning accuracy of ±0.003 mm. Ensuring high-dimensional consistency. Thread machining complies fully with ANSI B1.20.1 standards, featuring a 60° thread angle and a pitch tolerance of ≤ ±0.01 mm.

3. What are the custom proportions and pressure loss control of the reducing tee joint?

Support reducing ratio 1:0.5-1:2 (such as DN50×DN25, DN100×DN200), eccentric design to reduce pressure loss; under rated flow, reducing tee pressure loss ≤0.03MPa, far lower than the industry standard 0.05MPa.

4. What is the forming process of a stainless steel tee joint?

Adopt integral forging or precision casting technology, no weld dead angle, uniform metallographic structure, tensile strength ≥ 515MPa, yield strength ≥ 205MPa. Plumberstar’s forging process enables the joint body to be free of sand holes and pores, and it can withstand mechanical shocks in construction.

5. How to ensure the sealing performance of the Stainless Steel Tee joint?

Stainless steel tee joints‘ sealing surface features a conical or flat surface sealing design, which is combined with a fine-machined thread corresponding to the ANSI B1.20.1 standard or the flange surface with the GB/T 9119 standard. Before leaving the factory, it is tested at 1.5 times the rated pressure for 30 minutes.

6. How to control the weld quality of the tee joint?

Automatic argon arc welding is adopted, the weld seam is beautiful, the height of the weld leg is ≥6mm, and the qualified rate is 100% after X-ray nondestructive testing (RT) or ultrasonic testing (UT).

7. What are the MOQ requirements for bulk purchases of the tee joint?

Regular product MOQ: 1000 pieces/model. Customized product MOQ: 300 pieces/model. Plumberstar is the source factory, with no intermediate links, and can provide competitive wholesale prices. The larger the purchase volume, the greater the discount, which helps customers expand their profit margin.

8. What is the Special angle tee processing technology and accuracy?

Custom die forging + CNC machining, angle tolerance ±0.5°, verticality error between branch pipe and main pipe ≤0.03mm/m; eccentric design of flow channel, local resistance coefficient ≤0.6, 10% lower than conventional right-angle tee. Plumberstar’s technical team can optimize the flow channel structure according to customer drawings to ensure smooth flow of media, with a custom cycle of 7-15 days.

9. Custom process and adaptation standards for non-standard threaded joints?

You provide the thread standard, such as BSPP, G, or R thread, or the drawings. Our technical team will finish the thread parameter conversion within 24 hours. We’ll also custom-make special taps and dies. The production cycle takes 3 to 5 days.
After thread processing, we use customized gauges for inspection. The threads must screw smoothly with no stuck points. We also test the sealing performance. We hold the pressure at 1.5 times the rated pressure. Only after passing all tests can we start mass production. The minimum order quantity is 500 pieces.

10. Can stainless steel tee joints support system expansion?

Multiple Specifications Compatible, Fits Different Expansion Scenarios
Plumberstar stainless steel tees cover common pipe diameters, ranging from DN15 to DN100. They also support international standard thread interfaces, including BSPP, BSPT, NPT, and others.
You can connect them directly to pipes of different brands and materials. Stainless steel pipes, copper pipes, and PPR pipes all work. Whether you’re adding a new branch to a domestic water supply system, expanding an industrial fluid pipeline branch, or doing local renovation and expansion of a municipal pipe network, you can quickly match the right tee joint based on your existing pipeline specs. No need for large-scale transformation of the original system.
High-Strength Structure Ensures System Stability After Expansion
Our tees are made of high-quality 304/316L stainless steel. We use precision casting and seamless welding processes. The pressure rating can reach 1.6–2.5MPa. Tensile strength is significantly higher than that of ordinary carbon steel tees.
After system expansion, fluid pressure and flow in the pipeline increase. Our tees can effectively resist impact and vibration. This eliminates hidden dangers, such as joint leakage and cracking.
At the same time, the inner wall of the product is electrolytically polished. The flow channel is smooth. It won’t generate eddy currents or resistance loss due to increased flow after expansion. This ensures the overall operational efficiency of the system.

11. Why are stainless steel tee joints a reliable long-term solution?

Integrated Structure Design, Strong Pressure & Impact Resistance
The product is made in one piece. We use precision casting or the seamless welding process. The transition between the tee’s branch pipe and main pipe is smooth. No weld defects. No stress concentration points.
Pressure rating can reach 1.6–2.5MPa. It can stably stand pressure changes in pipeline systems. Things like hydraulic impact and fluid pulsation are no problem. Even in high-pressure scenarios — high-rise water supply, industrial fluid transmission — there’s no risk of joint leakage or cracking.
At the same time, the inner wall is electrolytically polished. The flow channel is smooth and won’t scale up. It avoids pipeline blockage caused by impurity buildup. This ensures the system runs stably for a long time.
Standardized Production Process, Stable Quality, No Hidden Risks
Plumberstar strictly follows the ISO 9001 quality management system. Every batch of stainless steel tees goes through three checkpoints: incoming material inspection, process inspection, and finished product inspection.
Raw materials are confirmed by spectral analysis.
Size tolerance is strictly controlled during production. Pipe diameter and wall thickness deviation are ≤±0.02mm.
Finished products pass pressure tests, air tightness tests, and other core checks.
Standardized quality control ensures every product has consistent performance. No quality fluctuations between batches. It eliminates system failures caused by product defects at the root.