Class 300 Hot Dipped Galvanized Malleable Iron Equal Coupling
2.High Pressure Resistant for Fire Protection, Natural Gas & Indoor & Outdoor Industrial Plumbing Pipeline .
3.Dual NPT/BSPT Two-End Female Thread, Tight Sealing Without Leakage .
4.Thickened One-piece Solid Casting, High Structural Strength, Anti-crack & Impact Resistant .
5.Full Internal & External Hot Dipped Galvanized Anti-corrosion Zinc Coating, Stable Performance & Extra Long Service Life .
6.Class 300 Heavy Pattern Standard, High Pressure Resistant & Wear-proof .
7.Universal NPT & BSPT Dual Standard Two-End Internal Threads, Tight Sealing Effect Without Leakage .
8.Equal Galvanized Malleable Iron Coupling, Suitable for Indoor & Outdoor Fire Protection, Natural Gas, Water Supply and Industrial Straight Pipeline Projects
Description
Class 300 Hot Dipped Galvanized Malleable Iron Equal Coupling Pipe Fitting
When you need to connect two sections of straight pipeline and link two female threaded pipes, our Class 300 Hot Dipped Galvanized Malleable Iron Equal Coupling is your ideal plumbing solution. This standard coupling features double female threads on both two ends, realizing smooth straight pipeline connection without extra adapters. Made of thickened high-quality malleable cast iron, it boasts stable mechanical performance and excellent high pressure resistance fully compliant with Class 300 heavy standard. The full internal & external hot dipped galvanized zinc anti-rust coating forms a tough protective layer to isolate moisture & oxidation and extend long service life for indoor and outdoor projects. Precise NPT & BSPT dual standard threads ensure tight, leak-free connection for fire protection, natural gas, water supply and industrial fluid piping systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Equal Coupling (Double Female Thread) |
| Pressure Class | Class 300 (300# Heavy Pattern) |
| Raw Material | Thickened High-Quality Malleable Iron |
| Surface Finish | Full Internal & External Hot Dipped Galvanized Anti-Corrosion Zinc Coating |
| Thread Standard | NPT American Standard & BSPT British Standard Dual Thread |
| Working Temperature | -20℃ ~ 120℃ |
| Applicable Medium | Water, Natural Gas, Compressed Air, Light Industrial Fluid |
| Certification | Fully Compliant with ANSI B16.3 Standard |
| Application Scenario | Indoor & Outdoor Plumbing, Fire Protection, Gas Straight Pipeline, Industrial Piping |
Key Features
1.Excellent Corrosion Resistance
Full hot dipped galvanized zinc coating covers the fitting’s inner and outer surfaces, effectively isolating moisture, salt mist and weak chemical corrosion. It delivers stable anti-rust performance for long-term use in indoor concealed piping and outdoor exposed water, gas pipeline systems.
2.Precise Thread Sealing
Standard NPT & BSPT double female threads on both ends are machined with high precision, enabling tight leak-free straight connection without extra sealant in most scenarios.
3.Easy & Quick Installation
Double female thread design realizes direct straight pipeline butt joint, no extra adapters required; compatible with common pipe wrenches for fast on-site assembly.
4.Stable Structural Strength
Made of thickened high-quality malleable iron, the fitting boasts outstanding mechanical toughness and impact resistance, rated for Class 300 heavy working pressure.
5.Wide Compatibility & Cost-Efficient
Suitable for indoor & outdoor plumbing, fire protection, natural gas and light industrial straight pipelines; provides reliable high-pressure performance at a competitive cost vs premium alloy alternatives.
Dimensions and Specifications
Our Class 300 hot dipped galvanized equal couplings support a full range of standard inch sizes, mainstream options include:
- 1/8", 1/4", 3/8", 1/2", 3/4", 1"
- 1-1/4", 1-1/2", 2", 2-1/2", 3", 4"
- Custom size, logo and packaging requests are acceptable
Every coupling is manufactured with precise dimensional tolerance. Solid thickened one-piece casting structure greatly prevents deformation or loosening under normal Class 300 heavy working pressure.
Materials and Surface Treatments
1.Main Body Raw Material
High-quality thickened malleable iron (ANSI B16.3 compliant) features high toughness, strong impact resistance and stable mechanical performance under Class 300 heavy pressure rating.
2.Surface Finish
Full internal & external hot dipped galvanized zinc finish forms a uniform anti-corrosion protective film covering the whole fitting, effectively resisting rust, moisture and mild chemical erosion for long-term indoor concealed and outdoor exposed pipeline use.
3.Thread Processing
Precision CNC machined NPT & BSPT double female threads on both two ends ensure tight, leakproof straight connection fit when connecting standard threaded pipes.
Standards and Certifications
Our products comply with rigorous international industry standards:
- Compliant with ANSI B16.3 (Class 300 Heavy Malleable Iron Threaded Pipe Fittings)
- ISO9001 quality management system certified
All Class 300 hot dipped galvanized equal couplings are fully tested for pressure resistance, thread precision and straight pipeline sealing performance prior to packaging.
Applications
1.Residential & Commercial Plumbing
For indoor & outdoor domestic cold/hot water pipelines, commercial restroom and kitchen straight pipeline butt connections.
2.Gas Pipeline Systems
Ideal for natural gas and LPG straight pipeline extension connection, with tight NPT & BSPT dual standard thread sealing.
3.Fire Protection Piping
Suitable for small-bore fire sprinkler straight pipeline connecting joints.
4.Light Industrial Fluid Delivery
Used for compressed air, low-pressure liquid industrial straight pipeline extension conversion.
Installation Instructions
- Thread Preparation: Clean male and female threads of pipe and coupling, apply PTFE tape evenly if needed.
- Hand Screw Alignment: Rotate the equal coupling by hand to align threads without forced twisting.
- Tool Tightening: Use two pipe wrenches to secure both two ends evenly, avoid over-tightening to prevent thread damage.
- Leak Test: Complete pressure test after installation to confirm zero leakage at both connection joints.
- Post-Check: Inspect straight pipeline connection regularly for long-term stable sealing.
Follow local plumbing, gas and fire safety codes during all installation work.
Packaging and Shipping
Each hot dipped galvanized malleable iron equal coupling is wrapped with anti-collision protective packaging to avoid scratches and abrasion during shipment. Moisture-resistant packaging materials are used to fully protect the complete zinc anti-corrosion galvanized coating intact. Large bulk shipments are loaded on standard pallets for convenient handling and container loading.
Based in Taigu, Shanxi, we have mature, efficient logistics channels covering worldwide ports and markets, enabling fast, cost-effective delivery for all bulk orders.
Quality Control
1.Raw Material Inspection
Every batch of thickened malleable iron raw material is inspected for chemical composition and mechanical toughness to meet Class 300 heavy standard.
2.Pressure Burst Test
Random samples of equal couplings are subjected to hydrostatic pressure testing matching Class 300 high working pressure rating.
3.NPT & BSPT Thread Precision Check
CNC thread gauges inspect two-end thread accuracy to guarantee tight straight pipeline leak-free connection.
4.Surface Anti-Rust Inspection
Full hot dipped galvanized zinc coating surface is fully checked to avoid galvanization defects, bare iron spots and surface flaws.
OEM and Customization Services
With an annual production capacity of 30,000 tons, we support bulk OEM & customized orders. Our R&D team can customize sizes, logos and packaging to satisfy unique project demands. We store over 1,000 sets of malleable iron fitting molds for fast customization and short lead times.
FAQ
Q: Can this hot dipped galvanized malleable iron equal coupling be buried underground?
A: It can be buried underground with extra anti-corrosion wrapping protection; direct burial without additional coating is not recommended for long-term service life.
Q: What is the correct installation method for this Class 300 hot dipped galvanized equal coupling?
A: Wrap PTFE tape evenly on both two NPT & BSPT female ends, tighten each side with two pipe wrenches symmetrically; do not over-torque to avoid thread damage.
Q: Can it cope with pipeline thermal expansion?
A: As rigid two-end threaded fitting, we suggest installing expansion joints for long straight pipelines with obvious temperature variation.
Q: Can it connect different material pipes like PVC and steel?
A: It can connect standard NPT & BSPT threaded pipes of different materials, ensure thread specification matches before assembly on both ends.
Q: Why choose hot dipped galvanized malleable iron coupling instead of stainless steel?
A:It features thickened casting, high mechanical toughness, stable 300PSI high pressure resistance, full internal & external zinc anti-corrosion coating, and offers great cost performance for indoor & outdoor plumbing, gas and light industrial straight pipeline projects.
Contact Us
Want to pick the suitable Class 300 Hot Dipped Galvanized Malleable Iron Equal Coupling for your project? Our technical team will offer professional one-stop selection support.Email: q1236800000@gmail.com Get technical specs, bulk price and delivery timeline by contacting us. We always provide premium hot dipped galvanized malleable iron straight pipe couplings for global pipeline projects.
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