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Cast Iron Flanges

Handling fluid connections in utility, irrigation, or drainage systems often leads to issues like gasket blowouts or brittle cracking under thermal changes. Our Cast Iron Flanges offer stability under load conditions and thermal cycling, keeping line integrity intact in both municipal and industrial installations. 

Standard Specification

ASTM A126 (Class A/B/C), EN 1092-2 (EN-GJL-250), IS 210 (FG 200/260)

Pressure Rating

Class 125/150 (PN6/PN10/PN16)

Material

Gray Iron (ASTM A48 Class 30), Ductile Iron (ASTM A536 65-45-12)

Nominal Size

½” to 24″ (DN15 to DN600)

Flange Type

Threaded (TH), Slip-On (SO), Blind (BL)
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Product Description

Sub-standard castings or inconsistent bolt alignment increase field fitment time. We provide flanges with matching bolt circles and flat-face finishing to simplify mounting in high-volume pipelines. 

Facing Type

Flat Face (FF) [Raised face requires reinforcement]

Dimensions

ASME B16.1 (Class 125/150)

Bolt Circle Diameter

Matches ASME B16.1 [±1.5mm tolerance]

Number & Size of Bolt Holes

Coarse thread bolts (UNC)

Surface Finish

As-cast (250-500 μin Ra), Machined (125-250 μin Ra)

Corrosion Resistance

Epoxy-coated (AWWA C110), Ni-Resist (for acids)

Temperature Rating

-10°C to +230°C

Material Certification

ASTM A395 (hydrostatic test), EN 10204 2.2

Gasket Compatibility

Full-face rubber/compressed fiber

Coating/Plating

Bituminous paint (AWWA C110), Fusion-bonded epoxy (FBE)

Manufacturing Method

Sand-cast (green/mold), Centrifugal-cast (for pipes)

Technical Advantages

Pipeline systems rely on flanges that maintain shape under pressure while resisting degradation. Our Cast Iron Flanges meet ASTM A126 and EN 1092-2, offering dependable performance across wide pressure and temperature ranges. 

Cracked faces or corroded threads can disrupt system uptime. These flanges come with fusion-bonded epoxy or bitumen coating options, and we offer ductile variants with higher impact and fatigue resistance. 

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Need reliable Flanges for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

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Industry Applications

Water Treatment Plants

Supports Class 125/150 line terminations, offering dimensional match with ductile iron pipe fittings.

Irrigation Channel Systems

Performs reliably in PN10-rated systems, connecting valves and riser lines with full-face gasket compatibility.

Fire Hydrant Assemblies

Integrates with standard hydrant tees, using epoxy-coated Cast Iron flanges for corrosion-resistance in city networks.

HVAC Ducting Installations

Matches fan coil units and heat exchangers in chilled water loops with FF flanges and UNC bolts.

Industrial Effluent Lines

Handles chemical drains using Ni-Resist coated ductile iron flanges, suited for mildly corrosive waste.

Sewage Pump Chambers

Works with slip-on connections for sludge discharge pipes where gasket sealing and bolt matching are critical.

cast iron flanges

Engineered to Hold Under Pressure

Utility networks need flanges that stay consistent over years of flow stress, thermal changes, and chemical contact. Our Cast Iron flanges support gasketed joints and match ASME B16.1 dimensions for easy integration across existing pipelines. 

Long procurement cycles can affect replacement or expansion plans. We offer standard and special-size flanges with material test certificates, helping procurement teams meet compliance and delivery targets with ease. 

cast iron flanges

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Having Doubts? Our FAQ

Check all our Frequently Asked Question

Can your cast iron flanges handle acidic or corrosive media?

Yes, we offer Ni-Resist grade options specifically for acidic and mildly corrosive fluids. These flanges resist chemical pitting and last longer than standard gray iron. You can request them with the same dimensional standards.

Do these flanges support frequent installation or dismantling?

Our face flanges maintain uniform sealing even after repeated tightening cycles. Ductile iron variants handle torque loads better during frequent assembly. Choose UNC-threaded holes for easier bolt engagement during routine work.

What coating options do you offer for extended outdoor exposure?

We supply bituminous paint as standard for buried or damp installations. For above-ground exposure, you can request fusion-bonded epoxy (FBE) coating. Both options meet AWWA C110 standards for long-term corrosion protection.

How do I confirm pressure compatibility across EN and ASME standards?

Our PN6 and PN10 models match Class 125/150 ratings for non-shock service. We provide pressure-temperature charts upon request for reference. You can align flange selection with both piping codes using these details.

Can these flanges be used with flexible rubber gaskets?

Yes, our flat face design supports full-face rubber or compressed fiber gaskets. This ensures even surface contact without gasket extrusion. Raised face types are not recommended unless reinforced.

How does Frigate ensure manufacturing consistency in CI flanges?
  • Controlled casting processes maintain uniform grain structure and strength 
  • Production aligned with ASTM, EN, and IS material standards 
  • Batch-level traceability ensures repeatable quality across orders 
  • Inspection protocols minimize risks of porosity, shrinkage, and misalignment 
What customization capabilities does Frigate offer for CI flanges?
  • Manufacturing support for non-standard dimensions and drilling patterns 
  • Adaptability to project-specific pipeline layouts and legacy systems 
  • Machined finishes delivered with tight tolerance control 
  • Technical validation ensures drawing-to-production accuracy 
What quality assurance standards are followed by Frigate during production?
  • Compliance with ASTM A126, EN 1092-2, and IS 210 specifications 
  • Dimensional and visual inspections conducted across each production batch 
  • Optional testing aligned with EN 10204 and hydrostatic validation standards 
  • Coating verification ensures long-term corrosion resistance performance 
How does Frigate support large-scale industrial flange requirements?
  • Manufacturing capacity aligned with bulk and project-based demand cycles 
  • Production planning supports staggered deliveries for EPC projects 
  • Consistent specifications maintained across high-volume output 
  • Capability to handle repeat production with identical tolerances 
What lead times can be expected from Frigate for CI flange manufacturing?
  • Standard flange sizes processed with optimized production turnaround 
  • Custom manufacturing timelines defined based on specification complexity 
  • Production scheduling aligned with project deadlines and dispatch planning 
  • Reliable delivery cycles supported by structured manufacturing workflows 
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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

Other Locations

  • Bhilai
  • Chennai
  • India
  • Germany
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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Other Locations

  • Bangalore
  • Chennai
  • India
  • Germany
Become a Frigatian
Become a Supplier

GENERAL ENQUIRIES

  • +91 96778 64606
  • manufacture@frigate.ai
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cast iron flanges

Cast Iron Flanges

Need reliable wires and cables for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

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cast iron flanges

Cast Iron Flanges

Need reliable Machining for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Get Latest Price

Get Price Form