Custom cast iron flywheel housing
Our custom cast iron flywheel housings are precision sand-cast and CNC-machined for diesel engines, industrial generators, and power transmission systems. Serving as the critical structural interface between the engine block and gearbox or generator end, each flywheel housing is machined to your exact bolt circle diameter, register bore, PTO opening, and mounting face flatness requirements. Available in grey iron and ductile iron, with full OEM and ODM support and first article inspection before mass production sign-off.
*Provide your application requirements—such as stress conditions, materials, size range, and even product name. We are always available for customization, so please contact us directly.
Introduction
Why Choose Our Cast Iron Flywheel Housings?
Precision Register Bore Machining — The flywheel and gearbox register bores are line-bored to tight concentricity tolerances, ensuring accurate alignment between the engine crankshaft, flywheel, and transmission input shaft to eliminate vibration and premature bearing wear.
Custom Bolt Circle & PTO Opening — Engine-side and gearbox-side bolt circle diameters, bolt hole count, PTO aperture size, and starter motor opening position are all machined to your exact drawing, ensuring direct compatibility with your engine and drivetrain assembly.
SAE Standard & Custom Configurations — We manufacture to SAE J617 flywheel housing standards (SAE 0 through SAE 6) as well as fully custom configurations for non-standard engine-to-gearbox interfaces and generator set applications.
Grey Iron & Ductile Iron Options — Grey iron provides excellent vibration dampening and cost efficiency for standard engine applications, while ductile iron delivers higher tensile strength and impact resistance for heavy-duty truck, marine, and off-highway powertrain use.
Full Machining on All Mating Surfaces — Engine block mating face, gearbox bell face, register diameters, and all bolt hole positions are CNC-machined and inspected by CMM to ensure accurate assembly with zero rework at your engine assembly line.
Specifications
Category Specifications & Technical Details Product Name Custom cast iron flywheel housing Scope of Services • Custom Casting & High-Precision CNC Machining (OEM/ODM)
• Prototype Design & Full-Scale Production
• Technical Support for Flywheel-Transmission Integration
• Structural Rigidity & Weight Optimization Analysis
• Reverse Engineering based on samples or blueprintsMaterials • Grey Cast Iron (HT250, HT300 / GG25, GG30) – Superior damping properties
• Ductile/Nodular Iron (QT450, QT500, QT600 / GGG40, GGG50) – Higher tensile strength
• Special Alloy Iron for enhanced fatigue resistance
• Compacted Graphite Iron (CGI) for lightweight/high-strength requirementsMachining Processes • Large-scale CNC Horizontal & Vertical Milling
• Precision Boring for crank/transmission alignment (Tight concentricity control)
• Multi-axis Drilling & Tapping for complex mounting patterns
• Face Grinding for leak-proof mating surface finish
• Stress Relief Annealing & Shot PeeningTarget Industries • Automotive (Internal Combustion Engines)
• Heavy-Duty Trucks, Buses & Commercial Vehicles
• Construction Machinery (Excavators, Loaders)
• Agricultural Equipment (Tractors, Harvesters)
• Marine Engines & Naval Propulsion Systems
• Power Generation Sets (Diesel/Gas Gensets)Surface Treatment • Industrial-Grade Anti-rust Primer & Finish Painting
• Protective Oil/Wax Coating for international shipping
• Powder Coating for high-durability environments
• Shot Blasting & Surface Phosphating
• Precision Face Oiling to prevent oxidationInspection Facilities • Large-format CMM (Coordinate Measuring Machine) for geometric accuracy
• Concentricity & Parallelism Testing Systems
• Ultrasonic & X-Ray Casting Integrity Testing
• Spectrometer for chemical composition verification
• Surface Profilometer for sealing face roughness analysisOur Advantages 1. Superior Vibration Damping: Optimized grey iron grades ensure minimal engine noise/vibration.
2. Perfect Alignment: Micrometer-level concentricity control extends flywheel and bearing life.
3. Structural Stability: Advanced heat treatment prevents warping under extreme thermal cycles.
4. Precision Seating: Zero-leakage mating surfaces ensure perfect transmission seal.
5. Rapid Turnaround: Efficient mold creation and CNC programming for custom one-offs or batches.
Related Products
Let’s talk about your next project !
I don't have complete drawings, can I send inquiry?
Yes, we can help you analyze based on your description, samples and photos.
I am not sure if you can do my parts?
Most of our customers come to us because “others say they can’t do it”.
Are you a factory or a trader?
We are a factory and have a project management team that can handle the technology, cost and delivery at the same time.
Upload Your FilesGet a Quote NowSTEP STP SLDPRT IPT PRT SAT IGES IGS CATPART X_T OBJ STL files