Size & Pressure Ratings for Malleable Iron and Grooved Fittings

FURDFITTINGS™ supplies malleable iron pipe fittings and ductile iron pipe fittings in sizes that meet the commercial needs of our partners, with pressure ratings that comply with standard requirements. This helps our partners to quickly and easily select products that align with their business models.

Malleable Iron Threaded Fittings - Precision Sized for Reliable Connections

Our ASME B16.3 Class 150 certified malleable iron pipe fittings feature standardized NPT thread dimensions from DN15 to DN100, engineered for optimal pressure performance in low-to-medium pressure systems.

ll fittings comply with ASTM A197 material standards and feature pressure-temperature derating coefficients for high-temperature applications up to 120°C. Ideal for plumbing systems, HVAC installations, and fire sprinkler networks requiring threaded connections.

Ductile Iron Grooved Fittings - Superior Pressure Performance

Engineered to exceed industry standards, our AWWA C606 compliant grooved pipe fittings deliver unmatched 2.5 MPa (362 PSI) working pressure across all sizes (OD 76mm to 219mm) – significantly surpassing the 1.2 MPa minimum requirement.

Uniform pressure rating maintained from OD 76mm (DN65) to OD 219mm (DN200)
Class 300 equivalent performance without size-dependent derating
Victaulic-style grooves ensuring leak-proof connections
Temperature resistance up to 80°C with EPDM gaskets

Certified to ISO 8180 standards, these couplings and grooved fittings are the optimal solution for high-pressure fire protection systems, industrial process piping, and commercial HVAC applications requiring rapid installation.

Class 150 malleable iron fitting dimensions

Malleable iron pipe fittings – 90-degree elbow, sizes
DN15-DN100 (½”-4″)

Malleable iron pipe fittings – Reducing Elbow, sizes
DN20*DN15-DN100*DN80

Malleable iron pipe fittings – Tee Equal , sizes
DN15-DN100 (½”-4″)

Malleable iron pipe fittings – Reducing Tee, sizes
DN20*DN15-DN100*DN80

Malleable iron pipe fittings – 4 Way Pipe Fitting Equal Cross, sizes
DN15-DN100 (½”-4″)

Malleable iron pipe fittings – Reducing Cross, sizes
DN20*DN15-DN100*DN80

Malleable iron pipe fittings – Socket , sizes
DN15-DN100 (½”-4″)

Malleable iron pipe fittings – Square Edge PlugSquare Edge Plug, sizes
DN15-DN100 (½”-4″)

grooved pipe fittings dimensions

grooved pipe joint – 90-degree elbow, sizes
OD76-OD219 (3″-6.8″)

grooved pipe joint – 22.5 ° Elbow, sizes
OD76-OD219 (3″-6.8″)

grooved pipe joint – Tee Equal , sizes
OD76-OD219 (3″-6.8″)

grooved pipe joint – Grooved Reducing Tee, sizes
OD76*OD33-OD140*OD114

grooved pipe joint – Cross sizes
OD76-OD219 (3″-6.8″)

grooved pipe joint – Grooved Reducing Cross, sizes
OD114*OD76-OD219*OD114

grooved pipe joint – Mechanical Tee Threacled Outlet , sizes
OD76*OD33-OD219 *OD114

grooved pipe joint – Adaptor Flange, sizes
OD76-OD219

Material Treatment of Malleable Iron Fittings and grooved pipe fittings

Malleable iron is a type of cast iron that is treated to impart malleability and toughness.

Casting

Fittings are first cast from white iron, which is hard and brittle. The chemical composition is carefully controlled, typically with around 2.5% carbon and 1.5% silicon.

Annealing

This is the critical heat treatment process. The white iron castings are heated to high temperatures (around 900-970°C or 1650-1780°F) for an extended period (often 20-100 hours) in a controlled atmosphere. During this process, the hard iron carbides in the white iron decompose into graphite nodules (temper carbon) within a softer ferrite or pearlite matrix. This transformation significantly improves ductility and machinability.

Grooved Pipe Fittings: Understanding Material, Size, and Pressure Capabilities

Grooved pipe fittings represent a modern and efficient method for joining pipes, offering advantages in speed of installation, flexibility, and maintenance. Their characteristics are defined by the robust materials used, extensive size availability, and reliable pressure performance.

Material Treatment of Grooved Pipe Fittings

Malleable iron is a type of cast iron that is treated to impart malleability and toughness. The process typically involves

Material Composition

Our groove pipe fittings are made of ductile iron, using materials with tensile strength and corrosion resistance no lower than ductile iron QT450-12, in compliance with the relevant standards

Casting and Machining

Fittings are precision cast and then machined to create the groove that accommodates the coupling gasket and housing.

Surface Coatings

The coating on groove fittings is designed to prevent corrosion and is suitable for use in fire sprinkler systems, building water supply systems, HVAC systems, etc.

Side-by-Side Comparison: Malleable Iron vs. Grooved Fittings

Feature	Malleable Iron Fittings	Grooved Pipe Fittings
Primary Material	Malleable Cast Iron	Ductile Iron
Key Material Property	Good strength, machinability, moderate ductility	Higher strength, excellent ductility, impact resistance
Common Surface Treatments	Hot-Dip Galvanized	Painted
Typical Size Range	1/2" - 4" (DN15 - DN100)	OD76-OD219
Common Pressure Classes/Ratings	Class 150 up to 300 PSI	Class 150 up to 300 PSI
Connection Method	Threaded (NPT, BSPT)	Grooved (Mechanical joint with couplings and gaskets)
Installation Speed	Slower, requires threading, sealing compounds/tape	Faster, no threading or welding, simple bolt tightening
Flexibility/Vibration Dampening	Rigid connection	Can offer flexibility (with flexible couplings), good vibration/noise dampening
Maintenance & Modification	More labor-intensive to disassemble/modify	Easier to disassemble, modify, and expand
Cost (Initial Fitting Cost)	Generally lower per fitting	Higher per fitting/coupling assembly
Cost (Installed Cost)	Can be higher due to labor	Often lower due to reduced labor time
Common Applications	Plumbing, gas lines, oil, general industrial	Fire protection, HVAC, industrial process piping, water/wastewater

Standard Certifications & Approvals

Our pipe fittings are manufactured in accordance with industry standards and are certified by certification bodies, demonstrating our commitment to the quality and safety of our pipe connection solutions. Common certifications include:

UL Listed / ULC Listed

FURDFITTINGS™ supplies pipe fittings that comply with the strict safety and performance standards established by Underwriters Laboratories for firefighting equipment and other applications in North America.

FM Approved

Our ductile iron fittings comply with FM standards and are particularly suitable for fire protection systems.

VdS Approved (Europe)

FURDFITTINGS™ complies with European VdS certification, confirming the superiority of our grooved joints for fire safety and security technology in terms of reliability and quality.

ASTM, AWWA, ISO

Our products adhere to relevant ASTM, AWWA, and ISO standards for materials, dimensions, and performance of mechanical pipe joining components.

Applications Industries

Fire Protection Systems

In fire sprinkler systems and indoor fire hydrant systems, malleable iron fittings ranging from DN15 to DN100 are widely used to connect sprinkler heads, fire hydrant boxes, alarm valve assemblies, and branch pipes. Their threaded connection method is mature and reliable.

HVAC Systems

In the water and steam piping systems of heating, ventilation, and air conditioning (HVAC) systems, malleable iron fittings with nominal diameters (DN) ranging from DN15 to DN100 are used to connect radiators, fan coils, small boilers, and pipe branches.

Gas Pipelines

In the use and installation of gas fittings for home use, malleable iron pipe fittings such as elbows and tees play an important role. Galvanized treatment provides excellent corrosion resistance, ensuring safety and pipeline integrity during long-term use.

Building plumbing system

In water supply and drainage systems for residential, commercial, office, and small industrial buildings, malleable cast iron fittings ranging from DN15 to DN100 are an economical and reliable choice.

Supplier of Malleable Iron Pipe Fittings and Grooved Pipe Fittings

FURDFITTINGS™ is a modern production enterprise engaged in casting production, mechanical processing to plastic coating packaging and sales. The main production and operation of Magang pipe fittings, groove pipe fittings, lining plastic pipe fittings and other related casting products, and is widely used in fire, gas, construction, water supply and drainage and other pipeline projects.