304 Stainless Steel NPT Threaded Flange Class150, ASME Standard Low Pressure Weld-Free Pipe Flange

304 stainless steel NPT threaded flange Class150 is the most widely used weld-free pipe fitting for industrial low-pressure pipeline systems, manufactured in strict accordance with ASME B16.5 standards and integrally forged from solid ASTM A240 304 austenitic stainless steel billets. Different from welding-type flanges, this threaded flange adopts internal thread screwing structure without open-fire welding, perfectly solving construction restrictions in flammable and explosive areas and narrow installation spaces. It is the preferred fitting for pipeline renovation, equipment connection and temporary pipeline layout in civil and light industrial projects. Adopting high-precision CNC machined standard NPT tapered thread with uniform pitch and accurate taper, the flange features excellent self-locking sealing performance, effectively avoiding micro-leakage and loosening under low-pressure and normal-temperature working conditions. Integral forging ensures dense and uniform metallographic structure without pores, sand holes or loose layers, providing higher structural strength, pressure resistance and deformation resistance than ordinary plate-cut threaded flanges. 304 stainless steel delivers outstanding oxidation resistance, rust resistance and atmospheric corrosion resistance, suitable for long-term transmission of clean water, compressed air, common oil and neutral process fluids without rusting or peeling. Class150 low-pressure rating fits most HVAC, water supply, drainage, fire protection and light industrial fluid pipelines. The flange is easy to install, disassemble and maintain, reusable for long-term cost reduction. Flat flange face and accurate bolt holes ensure excellent interchangeability with global standard pipes and valves. All products are acid-passivated, deburred and fully inspected dimensionally with thread fitting tests before delivery. As a direct factory supplier, we provide full-size in-stock products, complete MTR certificates and test reports for global low-pressure engineering and export orders.

Core Selling Points

1. Welding-free installation for fire-prohibited, explosion-proof and narrow spaces;

2.  Standard NPT taper thread self-locking design for zero leakage;

3.  Genuine 304 stainless steel for rust and oxidation resistance;

4.  Solid integral forging for dense structure and deformation resistance;

5.  Class150 universal rating for most low-pressure pipelines;

6.  Reusable structure reduces long-term maintenance cost;

7.  CNC precision thread machining avoids defective threads;

8.  Global standard dimension for full interchangeability.

   
   

Application Scenarios

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

Why Choose Us

With 15 years of manufacturing experience, we only adopt solid integral forging instead of low-quality plate cutting to eliminate structural defects. All threads are double CNC precision machined for standard tooth profile and tight fitting. 100% full inspection of dimension, thread and appearance is implemented before delivery, with complete PMI test reports and qualification certificates. Full-size stock, stable lead time and factory direct price support long-term global engineering and export cooperation with factory visit and sample testing available.

Customization Ability

Custom NPT/BSPP/BSPT/G thread types; non-standard bore, outer diameter and thickness; extended and deepened thread processing; mirror polishing and enhanced acid passivation; laser marking of logo, heat number and standard; thickened flange for upgraded pressure resistance; 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.