Precision Bushing Inner Tubes
Precision Bushing Inner Tubes function as the rigid metal core within elastomeric suspension bushings, bearing the structural clamping force of chassis mounting bolts while maintaining controlled radial compliance for suspension joints. Procurement engineers source these components to prevent structural crushing during high-torque assembly and to ensure precise rotational freedom under dynamic multi-axial vehicle loads.
Product Design and Features
Controlled Inner Diameter: Machined to exact clearance dimensions for smooth mounting bolt installation without binding.
Tight Outer Diameter Tolerance: Precision-ground to maintain consistent press-fit interference inside elastomer bodies.
Chamfered End Faces: Deburred and chamfered edges eliminate sharp corners to prevent internal cutting of surrounding rubber during assembly.
High Radial Concentricity: Strict wall thickness uniformity ensures balanced load distribution across the entire joint.
Precise Overall Length: Controlled cut-to-length dimensions prevent axial pre-load distortion when tightening frame brackets.
Material and Manufacturing
Available Materials: Seamless carbon steel tubing, alloy steel, stainless steel, and cold-drawn DOM steel tubes.
Manufacturing Operations: High-precision CNC cutting, precision turning, chamfering, centerless grinding, and optional induction hardening or carburizing.
Surface Treatments: Trivalent zinc electroplating, zinc-nickel alloy coating, black oxide, and corrosion-inhibiting preservation oil.
Technical Specifications
|
Parameter |
Specification Range |
|
Product Name |
Precision Bushing Inner Tubes |
|
Inner Diameter |
Custom per drawing |
|
Outer Diameter |
Custom per drawing |
|
Overall Length |
Custom per drawing |
|
Wall Thickness |
1.5 mm - 6.0 mm |
|
Concentricity |
Within 0.05 mm total indicator reading |
|
Material Grades |
SAE 1010, SAE 1020, STKM11A, E235, 20MnCr5 |
|
Surface Roughness |
Ra 1.6 μm - 3.2 μm |
|
Salt Spray Resistance |
96 h - 720 h neutral salt spray |
|
Standard Compliance |
Produced strictly to customer engineering drawings |
Customization Options
Drawing Review: Technical evaluation of 2D and 3D CAD files for dimensional feasibility and cost optimization.
Prototype Sampling: Sample production available for functional testing, push-out force validation, and dimensional verification.
Dimensional Customization: Variable inner and outer diameter combinations, custom wall thicknesses, and specialized end profiles.
Volume Scalability: Flexible batch production ranging from pilot runs to high-volume automotive schedules.
Quality Inspection
Dimensional Verification: Batch inspection utilizing digital micrometers, air gauges, height gauges, and optical comparators.
Geometrical Control: Regular monitoring of concentricity, straightness, and cylindrical form deviation.
Visual Inspection: Continuous checks for surface cracks, burrs, inclusion defects, and plating uniformity.
Documentation Support: Material test reports and initial sample inspection packages provided upon request.
Our Certificate
FAQ
Q: What tolerances can be achieved for the inner and outer diameters?
A: Diametrical tolerances are maintained within ± 0.015 mm to ± 0.03 mm through precision cold-drawing and centerless grinding processes, securing accurate press-fit performance.
Q: What surface plating options prevent corrosion in chassis environments?
A: Standard treatments include trivalent zinc electroplating and zinc-nickel alloy coatings, engineered to meet automotive salt spray endurance standards from 96 to over 720 hours without red rust.
Q: How are custom inner tube designs evaluated for manufacturing?
A: Evaluation begins with engineering drawing review, material analysis, and sample fabrication. Upon approval, production tooling and process parameters are locked under formal quality control plans.
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