Hansheng Automation (Dongguan) Co., Ltd.

When off-the-shelf components fail to meet your complex mechanical requirements, we turn your engineering drawings into high-precision custom machined bushings with tight tolerances and specialized oil groove structures. Powered by multi-axis CNC turning and milling equipment, our OEM bushing manufacturing supports flexible production from single-piece prototypes to high-volume runs with zero MOQ restrictions.

【Custom Bushings Technical Specifications】

Metal Materials: Bronze (C93200 / SAE 660, C95400), Brass, Stainless Steel (304, 316), Carbon Steel, Aluminum
Engineering Plastics: PTFE (Teflon), PEEK, Delrin (POM), Nylon, UHMW-PE
Dimensional Range Outer : Diameter (OD): 2 mm – 500 mm Length: Up to 1,000 mm
Machining Tolerances:
• Standard CNC Turning & Milling: ±0.01 mm
• Precision Machining & Grinding: ±0.005 mm
• Super-Precision Mirror Finishing: ±0.002 mm (for high-speed spindle bushings)
Internal Features: Figure-8 oil grooves, spiral oil grooves, straight oil grooves, internal threads, splines
External Features: Flanges, chamfers, undercuts, split / slotted designs
Surface Treatments: Polishing, Anodizing, Zinc Plating, Black Oxide, Heat Treatment (Carburizing / Hardening)

【Custom Features for Your Specific Applications】

Custom Oil Groove Bushings
Under heavy-duty, continuous operations, standard smooth bushings suffer from oil starved friction and heat failure. We machine complex internal lubrication patterns—including figure-8, double loop, spiral, and straight oil grooves—to ensure uniform grease distribution and extended service life across heavy machinery shafts.

Custom Flanged Bushings
When machinery must support both radial and axial thrust loads, flanged bushings provide dual-directional support and precise axial positioning. We machine custom flanged bronze and metal bushings with tight flange thickness tolerances and mounting steps, eliminating the need for separate thrust washers.

Split & Slotted Bushings
For applications requiring rapid assembly in tight housings or accommodation for thermal expansion and contraction, we produce precision split and slotted bushings. Available with straight-cut, diagonal, or interlocking splits, these designs ensure reliable press-fit retaining forces without binding the inner shaft.

Self-Lubricating Plastic Bushings
In oil-free, food-processing, chemical, or medical environments where liquid lubricants cause contamination, we CNC machine self-lubricating bushings from engineering plastics including PTFE, PEEK, Delrin, and UHMW-PE.

【Strict Quality Control for Every Bushing】

Dimensional stability begins at the machine level. Our facility utilizes high-rigidity Brother and Taesin CNC turning centers alongside precision vertical and horizontal machining centers to eliminate vibration drift and enforce tight tolerances across continuous production runs.

Operating under an ISO 9001 certified quality management system, we enforce strict quality gates to guarantee material integrity and dimensional precision:
Certified Material Traceability: We provide official Material Test Certificates (MTC / EN 10204 3.1) with every shipment, verifying exact chemical composition and mechanical properties to eliminate material fraud.
Precision Metrology Inspection: Critical dimensions, concentricity, runout, and surface finishes are verified using Zeiss Coordinate Measuring Machines (CMM) and high-resolution optical profile projectors.
Full Pre-Shipment Inspection Reports: Detailed dimensional inspection reports are generated and provided prior to dispatch, ensuring 100% compliance with your CAD drawings.

Precision Manufacturing Process & Deformation Control
Precision bushing manufacturing is not just about metal removal—it requires strict thermal and mechanical control to prevent wall deformation, runout drift, and internal stress release. Our engineering team utilizes specialized fixture design and multi-stage grinding to achieve tight concentricity and sub-micron surface finishes.

Incoming Material Verification ➔ Rough Turning & Stress Relief ➔ CNC Precision Turning ➔ Feature & Grooving CNC Milling ➔ Custom-Fixtured Grinding (ID/OD) ➔ Deburring & Cleaning ➔ CMM & Bore Metrology ➔ Protective Packaging

【Key Stage Engineering Highlights】

Stress-Relief Annealing: After initial rough turning, bronze and steel blanks undergo controlled stress relief to release internal metallurgical forces. This prevents the bushing from warping during final finishing operations.
Anti-Deformation Fixture Grinding: To solve the common issue of thin-wall distortion caused by standard 3-jaw radial chucks, we utilize custom axial-clamping fixtures for internal grinding. For outer diameter grinding, precision expansion mandrels lock onto the datum bore, holding coaxial runout within ≤ 0.005 mm.
Integrated Grooving & Features: Oil grooves (figure-8, spiral, or straight), external flanges, and keyways are CNC-milled before final grinding, ensuring zero burr intrusion into the critical bearing bore.
Bore Metrology & Surface Finish: Critical internal diameters (down to ISO H6 tolerances) are verified using 3-point internal micrometers and CMM equipment. Mirror finishes down to Ra 0.4 µm are maintained to minimize shaft friction and wear.

【FAQ】

What is your Minimum Order Quantity (MOQ)?
We have no minimum order quantity. We support flexible production volumes ranging from single-piece functional prototypes to high-volume OEM production runs.

What drawing file formats do you require for a quick quotation?
Please provide a 3D CAD model (STEP, IGES, or X_T) along with a 2D PDF drawing that specifies critical tolerances, surface roughness limits, and material grades.

What if I am unsure which material to select for my application?
Our application engineers can recommend the optimal metal alloy or engineering plastic based on your operating parameters—including working load, rotational speed (RPM), operating temperature, and lubrication requirements.

What machining tolerances can you achieve?
• Standard CNC Turning & Milling: ±0.01 mm
• Precision Grinding & Turning: ±0.005 mm
• Super-Precision Mirror Finishing: ±0.002 mm
Exact achievable tolerances depend on component geometry, material hardness, and wall thickness. Our engineering team reviews feasibility during technical quotation.

What are your lead times for prototypes and mass production?
Standard prototype lead times are 7 to 10 calendar days. Mass production orders are typically fulfilled in 15 to 20 business days. Expedited production options are available for emergency machine down scenarios.