304 Stainless Steel Threaded Blind Flange, Weld-Free Plug Flange for Pipeline Plugging And Pressure Testing

304 threaded blind flange, also known as threaded plug flange, is a special welding-free fitting for pipeline plugging, pressure testing, pipe isolation and idle port sealing. It realizes complete pipeline blocking by bolt locking without welding, widely used in pipeline pressure test, sectional isolation and equipment port sealing. Forged from solid 304 stainless steel billets, the thick solid structure prevents end bulging, deformation and leakage during pressure testing. Flat flange face and accurate bolt holes ensure tight sealing to meet water and air pressure test standards. 304 stainless steel provides excellent rust and corrosion resistance for indoor and outdoor long-term blocking service without oxidation or falling off. Welding-free installation suits pressure test projects, old pipeline renovation and fire-prohibited areas. Reusable design improves engineering flexibility. Manufactured per ASME B16.5 standards with precise tolerance for perfect interchangeability. Deburred and passivated finish ensures stable quality. An essential fitting for water supply, HVAC, fire protection and industrial pipeline pressure testing and isolation.

Core Selling Points

1. Solid integral forging for thick pressure-resistant blocking without deformation;

2. Welding-free bolt locking for fast no-fire plugging;

3. 304 rust and corrosion resistance for long-term indoor and outdoor service;

4. Flat sealing surface ensures zero leakage during pressure testing;

5. Reusable for flexible pressure test and isolation work;

6. Standard size for full compatibility with threaded fittings;

7. No bulging deformation for high safety pressure test;

8. Full-size stock for urgent engineering delivery.

   
   

Application Scenarios

Industrial pipeline water and air pressure testing, sectional pipe isolation, equipment spare port sealing, old pipeline renovation plugging, fire protection pipe pressure test, HVAC temporary blocking, municipal pipeline maintenance sealing, light equipment port closure.

Why Choose Us

All our threaded blind flanges are solid forged without plate splicing and stamping, ensuring high safety pressure resistance. Flatness, thickness and bolt spacing are strictly inspected to avoid leakage and deformation rework. Full size stock supports bulk pressure test engineering orders

Customization Ability

Custom thickened high-pressure threaded blind flanges, non-standard large-bore threaded plugs, NPT/BSP multi-thread blind flanges, high-strength pressure test blocking flanges, mirror polished sanitary blind flanges, project laser marking, export anti-rust packaging, special pressure grade customization.

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.