NPT Black Union Class 300 Pipe Fittings
2.Removable connector for easy pipeline installation & maintenance .
3.Widely applied in water, gas, oil and industrial fluid pipelines .
4.High-strength black malleable iron, durable & anti-deformation .
5.Precision threading, perfect match for NPT/BSPT standard pipes .
6.Class 300 pressure grade, reliable tight seal under working pressure .
7.Industrial-grade threaded pipe union for quick disassembly .
8.Removable threaded pipeline connection fitting
Description
Black Malleable Iron Union Class 300 NPT/BSPT Thread Pipe Fittings
Black Malleable Iron Union Class 300 NPT/BSPT Thread Pipe Fittings are heavy-duty detachable pipe connectors designed for industrial pipeline systems. Manufactured from premium black malleable iron, this fitting enables easy disassembly and maintenance of liquid, gas and oil pipelines. Equipped with precision NPT/BSPT dual standard threads, it delivers stable sealing performance for rigorous industrial scenarios that demand reliable pressure resistance.
The black anti-rust coating provides excellent corrosion resistance for long-term indoor and outdoor use. Its smooth rounded edge design eliminates sharp burrs, ensuring even stress distribution without leakage risks. This union solves core pipeline pain points: it prevents medium spillage under high vibration, allows convenient pipe separation in narrow installation spaces, and maintains tight sealing under Class 300 working pressure.
Our Factory
We are a professional manufacturer specializing in malleable iron pipe fittings, supporting OEM & ODM customization, strict quality inspection, fast delivery and 3-year warranty for all products.
Technical Specifications
Our fittings meet the most elevated industry guidelines. The pliable press development takes after ASTM A197 determinations, guaranteeing ideal ductility and quality. You get precision-machined NPT strings that acclimate to ASME B1.20.1 benchmarks for solid fixing performance.
The fabric composition incorporates 2.0-3.0% carbon and 1.0-1.8% silicon, giving the idealize adjust of quality and adaptability. These fittings accomplish a least malleable quality of 40,000 psi (276 MPa) and surrender quality of 30,000 psi (207 MPa). This prevalent quality avoids fragile break beneath stress.
Key Features
- Detachable Union Structure: Easy disassembly for pipeline inspection and maintenance
- Dual NPT/BSPT Precision Threads: Tight fit to achieve reliable pressure-proof sealing
- Black Malleable Iron Body: Absorbs thermal expansion & mechanical vibration without cracking
- Black Anti-rust Coating: Excellent corrosion resistance to extend service life
- Strict Precision Manufacturing: Full quality inspection to guarantee stable sealing performance
- Class 300 Pressure Rating: Designed for high-pressure industrial pipeline working conditions
Dimensions and Specifications Table
| Size (inches) | Thread Type | Pressure Rating | Weight (lbs) | Length (mm) | Height (mm) |
|---|---|---|---|---|---|
| 1/8 | NPT/BSPT | 300 PSI | 0.15 | 28 | 22 |
| 1/4 | NPT/BSPT | 300 PSI | 0.25 | 32 | 26 |
| 3/8 | NPT/BSPT | 300 PSI | 0.35 | 36 | 30 |
| 1/2 | NPT/BSPT | 300 PSI | 0.55 | 42 | 35 |
| 3/4 | NPT/BSPT | 300 PSI | 0.85 | 48 | 40 |
| 1 | NPT/BSPT | 150 PSI | 1.25 | 55 | 48 |
| 1-1/4 | NPT/BSPT | 150 PSI | 1.85 | 65 | 55 |
| 1-1/2 | NPT/BSPT | 150 PSI | 2.45 | 72 | 62 |
| 2 | NPT/BSPT | 150 PSI | 3.85 | 85 | 75 |
Materials and Surface Treatment
We adopt premium black malleable iron conforming to ASTM A197 standard. The material features excellent ductility while maintaining sufficient mechanical strength. Our exclusive black anti-rust coating is made of anti-corrosive varnish, which passes strict salt spray testing.
This surface coating provides reliable protection during transportation and installation. The black finish is a standard mark for oil, gas and industrial fluid pipelines, making it easy to distinguish from ordinary water pipeline fittings.
Standards and Certifications
Our Black Malleable Iron Class 300 Union Pipe Fittings comply with:
- ASME B16.3 dimensional standards
- ASTM A197 malleable iron material specifications
- ANSI/ASME B1.20.1 NPT thread standards
- ISO9001 quality management system certification
Application Areas
These detachable union fittings deliver reliable performance across multiple industrial mechanical systems. Widely applied in:
- Industrial Steam Systems Suitable for low & medium pressure steam delivery up to 300 PSI. Malleable iron structure withstands thermal cycling without losing sealing performance.
- Natural Gas & Propane Pipelines Standard fitting for commercial HVAC and gas supply pipelines. The removable design allows easy disassembly for pipeline maintenance.
- Oil & Gas Facilities Stable performance for non-corrosive fluid transfer systems, featuring high rigidity and excellent vibration resistance.
- Mechanical Manufacturing Equipment Ideal for oil circuits and pneumatic systems in heavy-duty industrial equipment environments.
Installation Instructions
- Thoroughly clean all pipe threads before assembly
- Apply thread sealant or PTFE tape evenly on threads
- Hand-tighten the union until it sits snugly
- Use a pipe wrench to tighten 1–3 additional turns moderately
- Do not over-tighten to prevent thread damage
- Conduct full pressure testing of the pipeline system after installation
Packaging and Shipping
Each union fitting is individually packaged to prevent scratches and damage during transit. We adopt standard export cartons that fit all available sizes perfectly. For bulk orders, we provide optimized bulk packaging solutions to cut down your shipping cost while fully protecting the products.
Quality Control
Every union fitting undergoes strict inspection before shipment. Our quality control process includes dimension verification, thread inspection and weight testing. We maintain complete traceability records for all products.
OEM and Customization Services
With over 26 years of manufacturing experience, we provide full customization services. Our production team can adjust sizes, materials and surface coatings to meet your unique demands. Minimum order quantities apply for customized specifications.
Frequently Asked Questions
Q: What’s the difference between round face and square face fittings?
A: Round face fittings adopt smooth curved edge design for even stress distribution without sharp edges, while square face fittings feature angular flat edges.
Q: Can these union fittings be used with potable water?
A: Our black malleable iron union is coated for oil, gas and steam working conditions. If you need fittings for drinking water, please choose our galvanized malleable iron series.
Q: What torque specifications should I use?
A: Please follow standard NPT torque values according to the union size; small sizes usually require 15–30 ft-lbs of torque.
Contact Us
Ready to discuss your Black Malleable Iron Class 300 Union Pipe Fitting demands? Our professional technical team can assist you in selecting the right specifications to match your working conditions. Feel free to email us at q1236800000@gmail.com for quotations, technical support or customized solutions.
As a manufacturer from Shanxi Taigu Zhiyuan, we stick to strict quality standards and thoughtful after-sales service, to be your reliable partner for all pipeline projects.
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