When standard parts don't meet your project requirements,JIANZHI delivers high-quality custom black iron pipe fittings tailored for professional plumbing and industrial applications. With decades of manufacturing expertise in malleable iron, we provide OEM & ODM solutions with precise threading, high-pressure durability, and strict adherence to international standards.
Looking for standard sizes? Browse our complete catalog of Black Pipe Fittings.
Product Description
We understand that commercial plumbing, gas distribution, and industrial piping systems require absolute precision. Here is what sets our custom black iron fittings apart:
Precision Threading: We utilize advanced CNC machining to create exact NPT, BSPT, or DIN threads, ensuring a 100% leak-proof connection for your plumbing systems.
High-Pressure Durability: Manufactured from premium malleable iron, our fittings are built to withstand high pressure and heavy-duty industrial use.
Flexible Customization: From non-standard dimensions and specific angles to unique surface treatments, our engineering team can bring your CAD drawings to life.
Direct Factory Pricing: As a direct manufacturer, we offer competitive wholesale prices for bulk custom orders without compromising on quality.
◆ Tensile Strength: Our black steel pipe fittings have 10% higher tensile strength than industry standards.
◆ Elongation Rate: With an elongation rate 33% higher than the standard, our fittings provide superior flexibility and strength under pressure.
◆ Durability: Resistant to corrosion and wear, ensuring a long lifespan in both plumbing and industrial systems.
In Brazil, where the construction and plumbing industries are rapidly expanding, choosing high-quality black steel pipe fittings is essential. At JIANZHI, we provide custom OEM solutions tailored to meet the specific requirements of the Brazilian market.
We provide comprehensive OEM/ODM services for B2B clients, contractors, and distributors worldwide. Our custom manufacturing capabilities include:
Custom Sizes: Available from [1/8"] to [6"] (Custom dimensions upon request).
Thread Types: NPT, BSPT, DIN, or customized thread lengths.
Product Types: Custom Elbows, Tees, Crosses, Unions, Couplings, Nipples, and more.
Surface Treatments: Normal black, Anti-rust oil, Epoxy coating, or custom finishes based on your specific environment.
Design Support: Simply send us your 2D/3D CAD drawings or a physical sample, and our molding engineers will provide a fast prototype.
Our custom black iron pipe fittings are engineered for low-pressure gas and liquid conveyance. They are highly recommended for:
Gas Distribution Lines: The standard choice for natural gas and propane piping due to its extreme tightness and durability.
Heating Systems: Perfect for steam and hot water heating systems in commercial buildings.
Fire Sprinkler Systems: Reliable connections for high-demand fire protection setups.
Please Note: Black iron fittings are highly susceptible to rust and are not recommended for potable (drinking) water systems.
Every custom fitting that leaves our facility undergoes rigorous testing. We guarantee compliance with international industry standards:
Material Standard: ASTM A197 / EN 1562
Dimensions: ASME B16.3 / ISO 49 / DIN 2950
Testing: 100% Air pressure tested before shipment to guarantee zero leaks.
Certification: ISO 9001 Certified Manufacturing.
Product Dimensions
Q: What is the minimum order quantity (MOQ) for custom black iron fittings?
Our MOQ for custom OEM orders is typically 500 pieces, depending on the complexity of the mold and the size of the fitting. However, we are flexible and can provide sample production for your testing before mass production.
Q: Can you manufacture fittings according to our CAD drawings?
Yes, absolutely. We have a dedicated R&D team and in-house mold making facility. Just send us your drawings or technical specifications, and we will evaluate and provide a quote within 24 hours.
Q: What is the lead time for customized orders?
Typically, mold creation and sample production take about 10-15 days. Once the sample is approved, mass production usually takes 15 days, depending on the order volume.
Q: How do you ensure the threads won't leak in gas systems?
We strictly control the thread processing using CNC machines and verify every batch using standard thread plug and ring gauges. Additionally, all fittings pass a strict pressure test before packaging.
Q: Are black pipe fittings cast iron?
A: The black pipe fittings are classified according to the surface treatment method, and the material can be malleable iron, ductile iron, carbon steel, PVC, PPR, etc. The black pipe fittings of Jianzhi brand are mainly made of malleable iron and ductile iron.
Q: How to check the air tightness of the black pipe fittings?
A: For the air tightness of black pipe fittings, Jianzhi Group has more than 200 testing equipment. All products are 100% tested. Test standard: 0.7Mpa air pressure, no bubbles for more than 5 seconds.
Q: Are black pipe fittings weldable?
A3: For small OD pipe, we will connect fittings by threaded. The material of the black pipe fittings are malleable iron, stainess steel, etc. For big OD pipe, we will connect fittings through weld, the material usually is carbon steel.
Q: How are black pipe fittings measured?
A: For the measurement and inspection of black pipe fittings dimensions, there are several measuring tools for threaded pipe fittings. Vernier callipers are used for size measurement, electronic scales are used for weight measurement, and plug gauges and ring gauges are used for thread accuracy measurement. Then compare the corresponding production standards to confirm whether the product is qualified.
Q: Does black pipe fittings rust?
A: Compare black pipe fittings (black malleable iron pipe fittings) with galvanized pipe fittings, the black one is rust easier because the surface doesn't have any protection. Usually, the black pipe fittings will be used for the gas pipe system and petroleum pipe system. For the water system, galvanized pipe fittings are better.
Q: What are black steel pipe fittings used for?
A: Black steel pipe fittings are typically used in plumbing and industrial systems, offering durability and resistance to high pressures and temperatures.
Q: How does JIANZHI ensure the quality of its black steel pipe fittings?
A: JIANZHI’s black steel fittings are made from premium materials, with 10% higher tensile strength and 33% higher elongation rate than industry standards.
Q: Are JIANZHI's black steel fittings suitable for the Brazilian market?
A: Yes! JIANZHI’s high-strength black steel fittings are ideal for both residential plumbing and industrial applications in Brazil.
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Contact Us
E-mail: sales1@jianzhi-fitting.com
Tel: +86 15822792427
Office In Tianjin:
Heping District, Tianjin, China.
Production Base 1:
Chifeng, Inner Mongolia, China.
Production Base 2:
Tangshan City, Hebei Province, China.
Production Base 3:
Schelei Street,Baicoi City,Prahova County,Romania
