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A custom bearing unit assembly is more than a housing with a bearing installed. It is the interface between a rotating shaft and the machine frame — the component that determines alignment, vibration, sealing integrity, and maintenance intervals。This page covers the assembly built under part reference PD161629038, and the engineering process behind it at Metalkeen.
What We Deliver
Metalkeen is not a casting foundry. We sit between the foundry and your machining line as an engineering translator — one point of accountability for material, machining, assembly, and dimensional verification。For this custom assembly, that means:
Machinability-driven process design. Parting lines, riser placement, and machining allowance are reviewed from the perspective of your fixture and cutting conditions — not just casting yield.
Application-driven bore control. Bearing bore geometry and mounting-face flatness are defined by the final equipment’s load, speed, and alignment requirements, not by a generic tolerance band.
One-window supply. Casting, heat treatment, CNC machining, bearing installation, and inspection are integrated under a single responsibility chain。
The table below follows the manufacturing capability framework Metalkeen applies to custom bearing housing assemblies。Deploy it as a visible HTML table and mirror the same values in Product Schema.
Parameter | Capability / Standard |
|---|---|
Product type | Custom bearing unit / bearing housing assembly |
Housing materials | Grey iron, ductile iron, cast steel, carbon steel, stainless steel 304 / 316 |
Bearing types accommodated | Ball bearing, roller bearing, spherical roller bearing, tapered roller bearing |
Manufacturing route | Casting or steel fabrication → CNC turning / milling → precision boring → bearing-seat machining → assembly |
Housing configurations | Pillow block, flange housing, split housing, cartridge, take-up, custom CNC |
Bore tolerance | Per drawing (typically IT6–IT7 for bearing seats) |
Coaxiality / flatness | Per drawing; CMM-verified on critical features |
Lubrication | Grease or oil; automatic lubrication ports available |
Sealing | Labyrinth seal, contact seal, oil seal, end covers |
Surface finish | Painting, powder coating, black oxide, zinc plating, passivation |
Inspection | CMM dimensional report, bore measurement, runout test |
Custom bearing units under this capability profile are typically specified in:
Conveyor systems — head and tail pulley support, where misalignment tolerance and sealing against dust are decisive.
Mining and aggregate equipment — shock-loaded pillow block positions requiring ductile iron or cast steel housings.
Paper and pulp machinery — wet-end and dryer sections where corrosion resistance and relubrication access drive material and seal selection.
Gearboxes and pumps — bearing seats where bore geometry directly governs gear mesh and shaft runout。
For washdown or chemical-exposure positions, stainless steel 304/316 housings are selected over painted cast iron; for high-impact loads, ductile iron or cast steel replaces grey iron。
Most sourcing conversations start with “can you make this casting?” The more consequential question is whether the casting will machine cleanly and hold bore geometry after installation. Metalkeen structures the entire process around that second question:
Risk in a casting-only supply chain | Metalkeen control point |
|---|---|
Local hard spots → tool breakage | Pattern and gating reviewed for machining-zone cleanliness |
Shrinkage porosity exposed on final pass → part scrapped | Casting simulation and process control on thick-section zones |
Bore distortion after machining → assembly precision lost | Stress-relief and post-machining dimensional verification |
Multiple suppliers → unclear accountability | Single point of responsibility from pattern to shipment |
These controls are built around the end-use application of the bearing unit, not around a foundry’s internal “casting acceptance” definition。
Can Metalkeen manufacture a custom bearing unit from a drawing or sample?
Yes. OEM manufacturing is based on customer drawings, 3D CAD models, or physical samples, covering casting or fabrication, CNC machining, bearing installation, and inspection under one order。
What materials are available for the housing?
Grey cast iron, ductile iron, cast steel, carbon steel, and stainless steel 304/316. Grey iron is the default for rigid general industrial duty; ductile iron or cast steel is selected for shock and impact loads; stainless steel for corrosive or washdown environments。
How is bearing bore quality verified?
Bearing bores, mounting faces, and seal grooves are machined to drawing tolerances and checked with CMM dimensional inspection, bore measurement, and runout testing before assembly。
What is the difference between a bearing housing and a bearing unit assembly?
A bearing housing is the structural body alone. A bearing unit assembly integrates the housing, bearing, seals, covers, fasteners, and lubrication features into one system that locates and protects the rotating shaft。
