Black Malleable Iron Coupling Class 300
2.Straight pipe connector for stable pipeline connection .
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 coupling for straight pipe connection .
8.Threaded pipeline straight connecting fitting
Description
Black Malleable Iron Coupling Class 300 NPT/BSPT Thread Pipe Fittings
Black Malleable Iron Coupling Class 300 NPT/BSPT Thread Pipe Fittings are heavy-duty straight pipe connectors designed for industrial pipeline systems. Manufactured from premium black malleable iron, this fitting firmly connects two pipes for stable transmission of liquid, gas and oil. Equipped with precision NPT/BSPT dual standard threads, it delivers stable sealing performance for rigorous industrial scenarios that demand reliable pressure resistance.
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 coupling fittings comply with top-tier industrial standards. Manufactured in accordance with ASTM A197 malleable iron standard, they deliver excellent ductility and stable mechanical performance. Precision-machined NPT/BSPT threads conform to ASME B1.20.1 standard, ensuring tight, leak-proof connection.
The malleable iron material contains 2.0–3.0% carbon and 1.0–1.8% silicon, striking an ideal balance of strength and flexibility. These pipe couplings achieve a minimum tensile strength of 40,000 psi (276 MPa) and yield strength of 30,000 psi (207 MPa). Superior mechanical strength prevents brittle fracture under working pressure and mechanical stress.
Key Features
- Straight Coupling Structure: Realize stable straight connection of two pipes
- 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 Coupling 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 straight coupling 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, realizing stable straight pipe connection.
- 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 coupling 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 coupling 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 coupling 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 coupling fittings be used with potable water?
A: Our black malleable iron coupling 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 coupling size; small sizes usually require 15–30 ft-lbs of torque.
Contact Us
Ready to discuss your Black Malleable Iron Class 300 Coupling 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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