Shaft Washer | Spring Steel Rotary Shim for Shaft Torque & Clearance Compensation
Shaft Washer is specially customized elastic shim exclusively for all kinds of rotating shaft assembly, completely different from conventional static flat washers used on PCB fixed terminals. Based on practical engineering experience , numerous electronic manufacturers encounter rotating jitter and loose terminals in mass production, mainly caused by replacing dedicated shaft shim with cheap SPCC/Q235 common washers.
With heat-treated 65Mn/SK5 spring steel raw material, this washer owns stable micro elasticity, core functions focus on filling tiny assembly tolerance gap and adjusting rotary friction torque instead of simply dispersing bolt pressure.
Core Technical Specifications
| Item | Parameter Details |
|---|
| Raw Material | 65Mn / SK5 Heat Tempered Spring Steel |
| Hardness | HRC44~52 with stable elastic property |
| Available Thickness | 0.08mm ~ 1.2mm ultra-thin series |
| Dimensional Tolerance | ±0.02mm precision control |
| Surface Treatment | Black Oxide / Chemical Nickel / Zinc-Nickel Alloy |
| Core Function | Shaft gap compensation | Rotary damping adjustment | Eliminate axial shaft wobble |
Precision Electronic Industry Application Scenarios
Notebook & Foldable Product Hinge Shaft: Stack different thickness shaft washers to fine-tune screen opening damping, fix too loose or tight rotation caused by machining error;
Smartwatch & TWS Earphone Inner Rotary Module: Black oxide finish avoids plating debris dropping to pollute built-in PCB and sensing chips inside sealed casing;
Micro DC Motor for Handheld Beauty Tools: Installed on rotor shaft to reduce eccentric shake, stabilize driving PCB working current and lower abnormal running noise;
Surveillance Mini Camera Lens Rotation Structure: Compensate assembly clearance to prevent picture jitter after long-time temperature alternation.
Industrial Automation & Precision Equipment Applications
Small Servo Motor & Gear Reducer End Shaft: Fill bearing installation gap to avoid axial shift under high-speed continuous rotation;
3D Printer Transmission Roller: Keep consistent rolling tightness to prevent uneven feeding of printing consumables;
Portable Medical Diagnostic Instrument Rotary Knob: Anti-corrosion nickel plated version adapts damp medical workshop environment, maintain stable twisting torque;
Automotive Electronic Control Adjustment Shaft: Resist long-term vehicle vibration, prevent knob loosening after thousands of operation.
Essential Difference From Regular Mild Steel Washer
Common Mild Steel Washer (/flat-washer/21): Static only
Used for PCB terminal fixed assembly, only disperse screw pressure to protect circuit board, no elasticity, cannot adapt rotary working condition.
Shaft Washer: Rotary only
Spring steel with elastic deformation characteristic, specially developed for rotating shaft clearance & torque control, cannot be substituted by ordinary flat washers in any rotary design.
Engineer & Buyer FAQ
Q1: Can SPCC/Q235 washer replace shaft washer for rotary parts? +
No. Low hardness ordinary steel will creep compression under repeated rotation and temperature cycle, shaft clearance will reappear within 1~3 months and cause rotation failure.
Q2: Best surface finish for fully sealed wearable electronics? +
Black oxide treatment is the optimal option without flaking metal powder, no contamination to internal PCB and precision electronic components.
Q3: Custom non-standard ID/OD/thickness available? +
We support OEM customized production according to customer engineering drawings for special automation equipment and new electronic prototype development.
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