Ningbo Fenghua Bolong Machinery Manufacturing Co., Ltd. is one of the leading manufacturers and suppliers of shock absorber spacer ring in China. Please feel free to buy durable shock absorber spacer ring made in China here from our factory. All customized products are with high quality and competitive price.
Core Advantages
Precision Thickness Control - Spacer rings are manufactured to exact thickness specifications with tolerances as tight as ±0.02mm. This precision ensures that the spacer delivers the exact axial clearance or bearing preload required for proper shock absorber function. Multiple spacers can be stacked to achieve total thickness not available as a single ring.
High-Strength Material Construction - Manufactured from carbon steel, alloy steel, or stainless steel grades selected for compressive strength, wear resistance, and dimensional stability under load. For heavy-duty truck and construction equipment applications, grade selection ensures the ring maintains thickness under sustained compressive loads - unlike inferior aftermarket alternatives that compress and alter preload settings.
Stamped & Ground Finishing - Parts are precision-stamped from steel strip, then surface-ground on both faces to achieve parallel faces within 0.01mm. The grinding process ensures even load distribution across the spacer face when compressed between mating components.
Corrosion-Resistant Finishes - Available with zinc plating, phosphate coating (black), or Dacromet - providing salt spray resistance up to 240 hours under ASTM B117 testing. Coating thickness is controlled to ensure it does not affect the spacer's critical thickness dimension.
Heavy-Duty Load Capacity - Constructed to withstand compressive loads without permanent deformation. Certified spacers maintain dimensional stability under loads exceeding 100kN, ensuring bearing preload and gear backlash settings remain within specification.
Complete Dimensional Verification - Thickness, outer diameter, inner diameter, parallelism, and flatness are verified on each production batch. 100% dimensional inspection is performed using precision gauging and CMM equipment. Inspection documentation accompanies each shipment with full traceability.
Technical Specifications
|
Parameter |
Details |
|
Product Name |
Shock Absorber Spacer Rings - Precision Spacers for Suspension & Axle Applications |
|
Materials |
Carbon steel, alloy steel, stainless steel (per application) |
|
Manufacturing Process |
Precision stamping, face grinding, deburring, coating |
|
Thickness Range |
0.5–5.0mm (customizable) |
|
Outer Diameter |
Application-specific (per customer drawing) |
|
Inner Diameter |
Application-specific (per customer drawing) |
|
Thickness Tolerance |
±0.02mm (precision-grade) |
|
Flatness |
≤0.02mm (ground faces) |
|
Surface Treatment |
Zinc plating, phosphate (black), Dacromet |
|
Applicable Standards |
ISO 4755, GB/T 97.1 |
|
Quality Systems |
IATF 16949 certified manufacturing |
Manufacturing Process
|
Stage |
Key Operations |
|
Stamping |
Precision blanking from steel strip |
|
Grinding |
Double-face surface grinding for thickness and parallelism |
|
Deburring |
Edge-breaking, chamfering to prevent seal damage |
|
Coating |
Zinc plating, phosphating, or Dacromet |
|
Inspection |
Thickness measurement, dimensional check, flatness verification |
Quality Control
Material Phase
Material certificates verify steel grade, chemical composition, and mechanical properties.
Grinding Phase
Spacer thickness, parallelism, and flatness are verified per batch. The precision grinding process ensures that faces are parallel to within 0.01mm and thickness tolerance is held to ±0.02mm. Evenly ground faces ensure load distribution is consistent across the entire contact surface.
Coating Phase
Coating thickness is measured to ensure it does not affect the critical dimension. Salt spray testing per ASTM B117 is performed on sample basis to verify corrosion protection.
Final Release
100% dimensional inspection of thickness, OD, and ID is performed. Flatness and parallelism are sample-checked. Complete inspection documentation accompanies each shipment with traceability to raw material and production parameters.
Application Scenarios
Passenger Car & Light Truck Shock Absorbers
Spacer rings in MacPherson strut and twin-tube shock absorber assemblies set the correct axial position of the piston on the rod and limit over-travel during rebound stroke. The spacer ring is typically located between the compression valve piston and the rod guide bushing, protecting the piston assembly from impact damage.
Heavy-Duty Truck Air Suspension
Spacer rings in air suspension shock absorbers require high corrosion resistance and dimensional stability under heavy loads. Thick-gauge steel spacer rings support the air spring upper mounting plate interface while maintaining precise alignment under varying payload conditions.
Construction Equipment Shock Absorber Axles
Spacer rings for motor grader axles, final drives, and differential assemblies set bearing preload and maintain accurate gear backlash. Precision grinding ensures consistent load distribution when multiple spacers are stacked to achieve the total thickness required.
Off-Highway Vehicle Suspension
Retaining and spacer rings in off-highway shock absorbers provide positive retention of spring retainers and stroke limiter members. Components are manufactured from spring steel or carbon steel with surface treatments selected for severe-duty corrosion exposure.
Custom Services
✔️ Thickness, OD, ID, and material grade per customer drawing
✔️ Finish selection - zinc plating, phosphating, Dacromet per corrosion requirements
✔️ Precision grinding for thickness and parallelism per application tolerances
✔️ Sample quantities for assembly fitment and preload validation
✔️ Production volume - from prototype to high-volume production with full PPAP documentation
Whether you need stamped metal shock absorber spacer rings for passenger vehicle suspensions, heavy-duty spacer rings for truck axle assemblies, or custom circular retaining rings for construction equipment shock absorbers - our engineering team provides full support from design review through stamping, grinding, surface treatment, and production delivery.
Contact Us for Your New Project
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