Product Overview
The eight-shaped (figure-eight) bearing housing carries two parallel bearing bores in a single cast body, supporting paired shafts or a shaft-and-idler arrangement while keeping center distance precisely fixed. Casting the two bores into one integrated structure, rather than bolting two separate housings to a frame, removes cumulative alignment error, improves rigidity, and reduces assembly labor on the production line.
Each housing is produced by investment casting (lost wax casting), then finished by precision CNC machining of the bore diameters, mounting faces, and fastener holes. The result combines the complex contours and material soundness of a casting with the dimensional accuracy a bearing seat requires. All parts are manufactured to customer drawings or supplied samples, so center distance, bore tolerance, wall thickness, and mounting pattern match your existing design rather than a generic catalogue part.
Technical Parameters
|
Item |
Specification |
|
Casting process |
Water glass investment casting / silica sol lost wax casting |
|
Secondary process |
CNC turning, milling, drilling, tapping |
|
Material |
304, 316, 316L, CF8M, WCB, 20#, 45#, 42CrMo, A356 |
|
Single part weight |
0.05 kg–50 kg |
|
Max casting dimension |
Up to 600 mm |
|
Casting tolerance |
±0.2 mm (CT4–CT8) |
|
Machining tolerance |
±0.02 mm on bores and locating faces |
|
Surface roughness |
Ra 3.2–6.3 μm as cast; Ra 1.6 μm or better after machining |
|
Surface treatment |
Shot blasting, passivation, painting, powder coating, zinc plating, electropolishing |
|
Inspection |
Spectrometer, CMM, hardness test, dimensional report, PT/UT/X-ray on request |
|
Quality standard |
ISO 9001, ASTM / DIN / GB / JIS |
|
Production capacity |
500 tons per year |
|
Customization |
Fully to customer drawing or sample |
Figures above reflect our general casting and machining capability range. Exact parameters for your part are confirmed against your drawing during engineering review.
Typical Materials
Housing alloy is selected according to load, operating temperature, and corrosion exposure:
- Stainless steel: 304, 316, 316L, CF8M
- Carbon steel: WCB, 20#, 45#
- Alloy steel: 42CrMo
- Aluminum alloy: A356
For food-processing and washdown environments we typically recommend 316 or 316L; for high-load gearbox and drivetrain duty, 42CrMo with appropriate heat treatment; and A356 aluminum where weight reduction matters more than peak strength. Alternative grades can be sourced or qualified on request.
Engineering Review
Before kicking-off tooling, our engineers provide a free technical review of your drawing and return DFM (Design for Manufacturing) feedback within 48 hours. For twin-bore housings, this review focuses on the areas that most often cause defects: wall thickness transitions at the waist between the two bosses, rib placement for stiffness, shrinkage risk at thick sections, and parting-line position. The goal is to optimize castability and reduce unit cost without weakening the structure that carries your bearing loads.
FAQ
|
Q1: |
How tightly can you hold the center distance between the two bores? |
|
A1: |
Standard casting tolerance is ±0.2mm. Because the bores are finish-machined after casting, center distance and bore diameter can be held significantly tighter, tell us your required tolerance and we will confirm feasibility during engineering review. |
|
Q2: |
Which material should I choose? |
|
A2: |
It depends on your operating environment. 316 or 316L suits washdown, food-processing, and corrosive conditions; 42CrMo with heat treatment suits high-load gearbox and drivetrain duty; A356 aluminum is used where weight matters more than peak strength. Our engineers will recommend a grade based on your load, speed, and temperature data. |
|
Q3: |
Can you supply the housing painted, plated, or otherwise surface-treated? |
|
A3: |
Yes. Shot blasting, passivation, powder coating, painting, zinc plating, and other finishes are available. Specify the finish on your drawing or in your inquiry. |
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