Class 300 Black Coated Malleable Iron Cap

Class 300 Black Malleable Iron Threaded Pipe Cap

When you need to seal off pipeline ends for temporary or permanent closure, our Class 300 Black Malleable Iron Pipe Cap is your reliable plumbing accessory. This fitting comes with internal female threads to cap pipe ends directly without extra adapters, efficiently blocking fluid outflow. Constructed from high-toughness malleable cast iron, it delivers stable mechanical performance and reliable pressure resistance that fully meets Class 300 industry standards. The uniform black anti-rust coating forms a dense protective layer to resist oxidation and extend the service life of the fitting. Precision NPT & BSPT dual-standard internal threads create tight, leak-proof sealing, perfectly matching fire protection, natural gas, water supply and industrial fluid piping systems.

 

Product Details

 

Class 300 Black Coated Malleable Iron Cap 1

Class 300 Black Coated Malleable Iron Cap 2

Class 300 Black Coated Malleable Iron Cap 3

Technical Specifications

Key Features

1.Excellent Corrosion Resistance The black anti-rust coating effectively isolates oxidation and moisture. It delivers stable rust-proof performance for long-term use in water, gas and indoor concealed piping systems.

2.Precise Thread Sealing Standard NPT & BSPT internal female threads are machined with high precision, enabling tight leak-free sealing without extra sealant for most pipeline projects.

3.Easy & Quick Installation Single female thread design directly blocks pipe ends without extra adapters; compatible with standard pipe wrenches for fast assembly and pipeline closure.

4.Stable Structural Strength Made of high-quality malleable iron, the pipe cap boasts outstanding mechanical toughness and impact resistance, certified for Class 300 rated working pressure.

5.Wide Compatibility & Cost-Efficient Suitable for plumbing, fire protection, gas and light industrial pipelines; offers reliable sealing performance with more competitive cost compared to alloy fittings.

Dimensions and Specifications

Our pipe caps 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"
• Custom size requests are acceptable

Every pipe cap is manufactured with precise dimensional tolerance. Solid one-piece casting structure greatly prevents deformation or loosening under normal working pressure.

Materials and Surface Treatments

1.Main Body Raw Material

High-quality malleable iron (ANSI B16.3 compliant) features high toughness, strong impact resistance and stable mechanical performance under Class 300 pressure rating.

2.Surface Finish

Black anti-rust raw finish forms a natural protective film on the fitting surface, effectively slowing oxidation and rust formation for long-term indoor pipeline use.

3.Thread Processing

Precision CNC machined NPT & BSPT single internal female threads ensure tight, leakproof fit to seal the end of standard threaded pipes.

Standards and Certifications

Our products comply with rigorous international industry standards:

• Compliant with ANSI B16.3 (Malleable Iron Threaded Pipe Fittings)
• ISO9001 quality management system certified

All pipe caps are fully tested for pressure resistance, thread precision and sealing performance prior to packaging.

Applications

1.Residential & Commercial Plumbing For domestic cold/hot water pipelines, temporary end sealing of restroom and kitchen pipes.

2.Gas Pipeline Systems Ideal for sealing off idle natural gas and LPG pipe ends, with tight NPT & BSPT dual standard thread sealing.

3.Fire Protection Piping Suitable for closing spare branch pipe ends of fire sprinkler systems.

4.Light Industrial Fluid Delivery Used for end blockage of compressed air and low-pressure liquid industrial pipelines.

Installation Instructions

1. Thread Preparation: Clean male pipe threads and the cap’s internal female threads, apply PTFE tape evenly if needed.
2. Hand Screw Alignment: Rotate the pipe cap by hand to align threads without forced twisting.
3. Tool Tightening: Use a pipe wrench to tighten the cap evenly, avoid over-tightening to prevent thread damage.
4. Leak Test: Complete pressure test after installation to confirm zero leakage at the joint.
5. Post-Check: Inspect the sealed connection regularly for long-term stable sealing.

Follow local plumbing, gas and fire safety codes during all installation work.

Packaging and Shipping

Each malleable iron pipe cap is wrapped with anti-collision protective packaging to avoid scratches and abrasion during shipment. Moisture-resistant packaging materials are used to keep the black anti-rust finish 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 malleable iron raw material is inspected for chemical composition and mechanical toughness.

2.Pressure Burst Test Random pipe cap samples are subjected to hydrostatic pressure testing matching Class 300 working pressure rating.

3.NPT & BSPT Thread Precision Check CNC thread gauges inspect thread accuracy to guarantee tight leak-free sealing for pipe end closure.

4.Surface Anti-Rust Inspection Black anti-rust surface finish is fully checked to avoid oxidation defects 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 malleable iron pipe cap be buried underground?

A: We do not recommend direct underground burial; for underground use, please select specialized anti-corrosion coated fittings.

Q: What is the correct installation method for this pipe cap?

A: Wrap PTFE tape evenly on NPT & BSPT threads, tighten with one pipe wrench steadily; do not over-torque to avoid thread damage.

Q: Can it cope with pipeline thermal expansion?

A: As rigid threaded fitting, we suggest installing expansion joints for long pipelines with obvious temperature variation.

Q: Can it connect different material pipes like PVC and steel?

A: It can seal standard NPT & BSPT threaded pipes of different materials, ensure thread specification matches before assembly.

Q: Why choose black malleable iron instead of stainless steel?

A: It features high mechanical toughness, stable pressure resistance up to Class 300, and offers great cost performance for plumbing, gas and light industrial piping.

Contact Us

Want to pick the suitable Class 300 Black Malleable Iron Pipe Cap 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 malleable iron pipe caps for global pipeline projects.