304 Stainless Steel Threaded Union
2.Made of Standard ASTM SS304 Stainless Steel with outstanding rust & corrosion resistance .
3.Precision matched conical metal-to-metal sealing, no additional gasket needed .
4.CNC precision machined NPT/BSPT taper threads for stable leak-proof connection .
5.Smooth inner cavity, effectively reducing medium flow resistance .
6.Simple assembly and disassembly, convenient for regular pipeline maintenance .
7.Suitable for water, gas, oil, weak acid and other industrial medium transportation .
8.Support customized laser logo, complete specifications for wholesale supply
Description
304 Stainless Steel Threaded Union Pipe Fitting
Designed for detachable connection of industrial piping systems, our ASTM SS304 threaded union is a reliable fitting for chemical, water supply, food and marine projects. It adopts precisely CNC-machined NPT/BSPT standard taper threads, cooperating with matched conical sealing surfaces to form tightly sealed zero-leak threaded joints and simplify on-site pipeline assembly, disassembly and maintenance.
It is manufactured from standard 304 stainless steel with uniform compact texture, delivering excellent rust resistance and anti-corrosion performance against water, oil, gas and weak acid media. Stable sealing performance can be maintained under long-term working conditions. Optional surface finishing improves appearance and extends service life for both indoor and outdoor piping systems.
Standard stocked sizes cover 1/2" to 4", supporting fast bulk delivery. Custom wall thickness, laser OEM logo engraving and special dimension machining services are available. These stainless steel threaded unions are widely applied in food processing, petrochemical plants, shipbuilding, heating networks and water treatment pipeline infrastructure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | 304 Stainless Steel Threaded Union Pipe Fitting |
| Pressure Class | Medium & High Pressure Grade |
| Raw Material | Standard ASTM SS304 stainless steel, uniform compact texture, excellent rust and corrosion resistance |
| Surface Finish | Optional treatments: natural polishing, pickling passivation; clean surface, stable anti-corrosion performance |
| Connection Type | Precision machined dual-standard NPT/BSPT tapered threads, matched conical metal-to-metal sealing for leak-free assembly |
| Working Temperature | -20℃ ~ 180℃ |
| Applicable Medium | Water, gas, oil, weak acid and weak alkaline industrial fluid |
| Certification Standard | Complies with international stainless steel pipe fitting processing standards |
| Application Scenario | Food industry, water treatment, chemical engineering, shipbuilding, heating pipeline projects |
Key Features
1.Superior Anti-corrosion & Rust-proof Performance
Standard ASTM SS304 stainless steel material features stable resistance to oxidation, fresh water, oil and weak acid erosion. The fitting maintains long service life whether deployed in food processing, water treatment or outdoor marine pipeline environments.
2.Leakproof Precision Tapered Thread & Conical Seal
Accurately machined NPT/BSPT dual-standard tapered threads deliver tight threaded meshing. Matched convex-concave conical surfaces realize metal-to-metal hard sealing without extra gaskets, achieving stable zero leakage under long-term pipeline operation.
3.Convenient Disassembly For Pipeline Maintenance
Modular union split structure allows quick separation of pipeline sections. Greatly facilitates system overhaul, component replacement and pipeline reconstruction, saving plenty of on-site construction time.
4.Smooth Inner Cavity To Reduce Medium Flow Resistance
Polished seamless inner surface avoids medium turbulence and flow loss. Compatible with standard threaded steel pipes, no extra transition fittings required to accelerate field installation.
5.Broad Usage Scenarios With Flexible OEM Options
Widely applicable for food industry, chemical facilities, water supply, shipbuilding and heating piping systems. Regular dimensions from 1/2" to 4" are stocked in bulk; customized wall thickness, laser logo engraving and bespoke dimension machining are all available.
Dimensions and Specifications
Our 304 stainless steel threaded unions support full standard inch sizes, mainstream options include:
- 1/2", 3/4", 1"
- 1-1/4", 1-1/2", 2", 2-1/2", 3", 4"
- Custom size, OEM laser logo engraving and special export packaging requests are acceptable
Every union is manufactured with tight dimensional tolerances. The split union structure with matched conical sealing surfaces effectively guarantees stable sealing performance and prevents medium leakage during long-term service under various operating environments.
Materials and Surface Treatments
1.Main Body Raw Material
Standard ASTM SS304 stainless steel features outstanding rust resistance and anti-corrosion capability against water, oil, gas and weak acid media. It delivers stable performance for food, chemical, water treatment and marine pipeline systems, perfectly fitting detachable pipeline connection layouts.
2.Surface Finish
Uniform pickling & passivation treatment forms a compact passive anti-corrosion layer to defend against rust, moisture and mild chemical media, granting dependable service for industrial pipelines both indoors and outdoors. Natural matte finish, mirror polishing are all available as per customer demands.
3.Connection Processing
Internal NPT/BSPT standard tapered threads are precision machined. The evenly cut thread profile enables tight threaded mating. Cooperated with precision conical metal-to-metal sealing structure, it forms leakproof connections for long-term fluid transport.
Standards and Certifications
Our products comply with rigorous international industry standards:
- Manufactured in accordance with stainless steel pipe fitting processing specifications
- ISO9001 quality management system certified
All 304 stainless steel threaded unions undergo comprehensive testing for sealing performance, thread dimensional accuracy and corrosion resistance before packaging and delivery.
Applications
1.Petrochemical & Industrial Pipeline
Fit for water, gas, oil and weak corrosive fluid pipelines in chemical plants, realizing convenient detachable connection for pipeline maintenance and reconstruction.
2.Shipbuilding & Marine Pipeline Systems
Applied to marine water supply, fuel and heating pipeline systems. Good rust and salt spray resistance adapts to humid and corrosive offshore working environments.
3.Food & Water Treatment Piping
Suitable for drinking water, beverage processing and water treatment pipeline systems. SS304 material meets hygienic requirements without medium contamination risk.
4.Heating & General Industrial Fluid Delivery
Used for central heating, compressed air and industrial fluid transfer pipelines. The split union design enables quick disassembly for system overhaul.
Installation Instructions
- Thread Pre-treatment: Clean NPT/BSPT threaded sections as well as mating pipe threads, get rid of rust, oil stains and burrs before assembly.
- Position Alignment: Apply proper thread sealant evenly, screw the union into matching pipe threads and keep it aligned without skew.
- Controlled Torque Fastening: Tighten the fitting with suitable torque. Avoid over-tightening that may cause thread deformation or sealing surface damage.
- Pressure Leak Test: Carry out pressure testing after installation to verify perfect sealing of threaded joints and conical mating surfaces.
- Periodic Inspection: Regularly check threaded connection areas to sustain long-term safety of piping networks.
Follow industrial threaded piping specifications and local safety standards during installation work.
Packaging and Shipping
Each 304 stainless steel threaded union is wrapped with anti-collision protective film to prevent scratches and thread deformation during transit. Moisture-proof packaging keeps the pickling passivated surface and precision machined threads intact. Bulk orders are loaded on standard export pallets for convenient handling and container shipment.
Our factory is located in Taigu, Shanxi. We cooperate with mature global logistics channels covering major overseas ports, providing fast, cost-effective mass delivery for all industrial pipeline projects.
Quality Control
1.Raw Material Spectral Composition & Mechanical Test
Every batch of ASTM SS304 stainless steel raw material will undergo full spectral analysis and mechanical performance testing to meet stainless steel pipe fitting technical standards.
2.Hydraulic Sealing Pressure Inspection
Random finished 304 stainless steel threaded unions are selected to conduct hydraulic sealing test according to rated working pressure, to verify stable zero-leakage performance of conical sealing surfaces.
3.Thread Dimension Precision Calibration
Special custom go-no-go gauges measure pitch, major diameter and thread tolerance of internal NPT/BSPT threads to ensure perfect meshing with standard steel pipes and reliable threaded sealing.
4.Full Surface Visual Defect Screening
100% manual visual inspection after pickling & passivation to remove burrs, stains, surface flaws on thread sections and outer surfaces, guarantee stable long-term anti-corrosion performance.
OEM and Customization Services
We reach stable annual production capacity and support large-volume OEM & ODM customized orders. Our professional engineering team provides one-stop customization solutions: custom wall thickness, non-standard sizes, laser engraving brand logos and exclusive export packaging for all kinds of industrial pipeline projects. We possess complete moulds covering 1/2"~4" specifications, which greatly shorten sample production and mass delivery lead time.
FAQ
Q:Can this 304 stainless steel threaded union be buried underground?
A: Extra external anti-corrosion protection is mandatory for underground buried installation. Direct burial without protective treatment will greatly shorten the service life of the union fitting. Custom anti-corrosion protection solutions can be provided on request.
Q: What is the standard installation method for this stainless steel threaded union?
A: Apply qualified thread sealant evenly on matching threads, screw the union onto corresponding pipes with proper torque. Avoid excessive tightening that may damage threads or conical sealing surfaces, so as to achieve long-term leakproof connection.
Q: Can it withstand pipeline thermal expansion?
A: This fitting is a rigid connection component. We recommend installing expansion joints for long-distance pipelines with large temperature fluctuation ranges to absorb thermal deformation stress.
Q: Is it compatible with different steel pipes?
A: It perfectly matches standard pipes with corresponding NPT/BSPT thread specifications. Please confirm matching thread sizes and pipe wall thickness prior to formal assembly work.
Q:Why choose 304 stainless steel threaded union instead of carbon steel pipe fittings?
A:ASTM SS304 material delivers excellent rust resistance and anti-corrosion capability against water, oil, gas and weak acid media. Precision matched conical sealing structure enables convenient repeated disassembly, making it ideal for food, water treatment, marine and corrosive medium piping systems.
Contact Us
Searching for dependable 304 stainless steel threaded unions to advance your industrial piping projects? Our seasoned technical team delivers end-to-end product selection guidance together with comprehensive technical backup support.Email:q1236800000@gmail.com We can furnish official full-version technical datasheets, affordable bulk wholesale quotations and dependable delivery timelines. Our premium stainless steel threaded union fittings are widely supplied to international projects across food processing, water treatment, petrochemical sectors, shipbuilding works and heating pipeline systems.
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