Our custom cast iron crankcases are engineered for twin-cylinder compressors and other reciprocating machinery. The housing features two symmetrical cylinder mounting bores and a reinforced central section designed to support the crankshaft, bearings, and internal transmission components.

Manufactured through sand casting followed by precision CNC machining, the component combines the vibration-damping characteristics of cast iron with the dimensional accuracy required for reliable compressor assembly. Cylinder mating faces, internal bores, threaded holes, bearing seats, and connecting surfaces can be machined to customer-specified tolerances.

The one-piece cast structure provides good rigidity and balanced load distribution, helping maintain accurate alignment between the two cylinder positions and the central drive mechanism. Reinforcing ribs and thickened mounting sections improve structural stability under repeated cyclic loads.

Unmachined surfaces can be treated with an industrial protective coating to improve corrosion resistance and provide a clean, durable finish. Coating color, machining areas, dimensional tolerances, and inspection requirements can all be customized according to different operating conditions.

Typical applications include twin-cylinder air compressors, reciprocating compressors, pneumatic equipment, industrial pumping equipment, and custom reciprocating machinery.

Key Features

One-piece twin-cylinder crankcase construction

High-strength cast iron body

Precision-machined cylinder mounting bores

Precision-machined bearing and shaft seats

Accurately positioned threaded holes and mounting patterns

Reinforced central housing for stable operation

Good vibration damping and dimensional stability

Protective corrosion-resistant outer coating

Full OEM customization based on drawings or samples

Material and Manufacturing Services

Available Cast Iron Materials

Gray cast iron

Ductile cast iron

Other cast iron grades upon technical review

Available Manufacturing Services

Sand casting

CNC boring and milling

Drilling and tapping

Precision bearing-seat machining

Dimensional inspection

Optional leakage or pressure testing when required

Industrial painting and protective coating

Customizable Specifications

Overall crankcase dimensions

Cylinder bore diameter

Bore center distance and parallelism tolerance

Bearing-seat dimensions

Crankshaft position and mounting-hole layout

Thread sizes and hole patterns

Machining tolerances

Cast iron material grade

Surface coating type and color

Inspection and testing requirements

We provide complete OEM manufacturing based on customer drawings, 3D models, physical samples, or existing components. Our services can cover casting, CNC machining, surface coating, dimensional inspection, and final quality control.