Machined Housing with Large Circular Housing and Concentric Stepped Faces, Bolt Holes

Bore diameter tolerance and bolt hole true position are the primary control callouts for a large circular housing with concentric stepped faces; bore diameter outside H7 tolerance prevents the bearing or shaft from seating at the design depth in the largest stepped face and creates misalignment between the shaft centreline and the housing mounting face normal in pump, wind energy, and robotics drive housing applications. Bolt hole true position outside ±0.2 mm displaces the bolt circle and requires assembly force that generates bending moment in the flange bolts. Hangzhou Pengbo Precision Machinery (Hangzhou, Zhejiang, established 2009, ISO 9001 certified) bores and mills this large circular housing with concentric stepped faces and bolt holes at their approximately 20,000 m² Hangzhou facility using boring & milling, four-axis horizontal machining, gantry milling, and vertical turning, with bore diameter, bolt hole true position, and face flatness validated to your drawing requirements during first-piece verification. Pengbo serves pump & valve, machinery, wind energy, pressure vessel, and robotics large circular housing applications. We can quote once we have bore diameter, bolt hole true position, face flatness, and material from your drawing. For a machining project quote from our hangzhou team. Clients span semiconductor, shipbuilding, and drones sectors.