304 Stainless Steel Threaded Flange Class150 NPT Standard, Low Pressure Threaded Pipe Flange Without Welding

304 stainless steel NPT threaded flange Class150 is a widely used non-welding pipe fitting for low-pressure industrial pipeline systems, manufactured in strict accordance with ASME B16.5 standards and forged from ASTM A240 304 austenitic stainless steel. The biggest advantage of this threaded flange is welding-free installation by thread screwing, perfectly solving construction restrictions such as no open fire, no welding and narrow installation space. Adopting standard NPT tapered pipe thread with precise tooth profile and uniform pitch, the flange achieves excellent tightness and zero leakage with standard gaskets. Integral forging ensures dense metallographic structure without pores, sand holes or loose structure, providing higher pressure resistance and stability than plate-machined flanges. 304 stainless steel features excellent oxidation resistance and atmospheric corrosion resistance, suitable for conveying water, air, common oil and neutral fluid without rusting or peeling. Class150 low-pressure rating fits most civil and general industrial pipelines. The flange is easy to install, disassemble and maintain, reusable for long-term cost saving. Flat flange face and accurate bolt holes ensure strong interchangeability with global standard pipes and valves. All products are acid-passivated and deburred for better anti-corrosion performance. Widely used in water supply, HVAC, industrial fluid pipelines and fire protection systems. As a professional threaded flange manufacturer, we strictly inspect thread precision for every product to avoid thread slipping and defective teeth, providing stable stock and fast delivery for global orders.

Core Selling Points：

1. Welding-free installation for no-fire construction sites; 2. Standard NPT taper thread for tight sealing and zero leakage; 3. 304 stainless steel for rust and oxidation resistance; 4. Integral forging for dense structure and deformation resistance; 5. Class150 universal low-pressure grade for general pipelines; 6. Reusable design for low maintenance cost; 7. High-precision thread processing avoids defective teeth; 8. International standard size for global interchangeability.

Application Scenarios：

Municipal water supply and drainage, industrial HVAC systems, common oil transmission pipelines, low-pressure fire protection pipelines, mechanical equipment auxiliary connections, factory ventilation fluid pipes, neutral medium pipelines, light environmental protection fluid equipment.

Why Choose Us：

We have 15 years of experience in manufacturing stainless steel threaded flanges. All threads are precisely CNC machined with standard tooth profile and perfect fitting. All products are forged from solid billets instead of low-quality plate cutting to avoid structural defects. Full inspection of thread precision, dimension and appearance is conducted before delivery. We provide MTR certificates and factory qualification documents, supporting bulk export and engineering orders with sufficient stock and factory direct price.

Customization Ability:

Custom NPT/BSPP/BSPT/G thread types; non-standard bore, outer diameter and thickness; extended thread and deep tooth customization; mirror polishing and enhanced passivation; laser marking of logo, standard and heat number; thickened flange for special low-pressure conditions; fumigated wooden case and vacuum anti-rust export packaging.

FAQ:1:How long is the custom lead time for stainless steel flanges in Wenzhou?

— 8 to 10 working days

2:What is the fastest delivery time?

— 3 working days

3:Do you support non-standard custom flanges?

— Yes, we do.

4:Can you process special sizes?

— Yes. Max processing size: 4000 mm, Min processing size: 30 mm.

5:Do you have stainless steel flanges of standard sizes in stock?

— Yes.

6:Can we customize flanges based on customer drawings or samples?

— Yes.

7:Will material test certificates and inspection reports be provided for the purchased flanges?

— Yes, they will.

8:Is there a quality warranty for the flange products?

— Yes.

9:How to handle quality defects if they occur?

— Product return and exchange available.

10:What is the minimum order quantity for flange pipe fittings? Can small-batch orders be accepted?

— We support small-batch orders and sample orders with no mandatory high minimum order quantity. We accept orders starting from 1 piece for regular specifications. As an original manufacturer, we are equipped with flexible digital production lines that enable quick production changeovers between different specifications. We are willing to fulfill trial orders or urgent scattered repair orders for just 1 or 2 pieces. Meanwhile, we carry out full quality control procedures including spectrum testing and dimensional inspection, without lowering quality control standards due to small order volumes.

11:Do flange products come with a quality warranty? How do you handle quality defects?

—All our products are covered under warranty and manufactured in strict accordance with criteria specified in contracts and technical agreements. If quality issues arise solely from our manufacturing faults, we offer unconditional return and replacement and bear corresponding liabilities. Supported by a full-process digital traceability system, we can accurately pinpoint problematic batches and working procedures to thoroughly investigate risks and prevent recurring similar defects. Our after-sales team provides 24-hour response to guarantee speedy resolution of all issues.