Pre-Assembled Screw and Conical Washer
The conical washer is installed and retained on the screw during production, eliminating the need to prepare or position the washer separately during assembly. This helps reduce assembly steps and improve operating efficiency.
Conical Structure Provides Elastic Preload
When compressed by the screw head, the conical washer generates an elastic reaction force that provides continuous axial preload at the joint, helping maintain the clamping condition between the screw and workpiece.
The actual spring force depends on washer material, thickness, outside diameter, curvature, and compression amount, and should be selected according to the actual loading conditions.
Helps Compensate for Changes in Fastening Preload
When the workpiece undergoes small dimensional changes caused by thermal expansion and contraction, material settling, surface compression, or prolonged loading, the conical washer can use its elasticity to compensate for part of the displacement and help reduce rapid loss of screw preload.
Provides Auxiliary Anti-Loosening Performance
The elastic reaction force of the conical washer helps maintain pressure at the joint and can reduce the possibility of rotational loosening under general vibration and dynamic-load conditions.
The conical washer is an auxiliary anti-loosening feature. For applications involving severe vibration, heavy impact, or safety-critical equipment, additional locking measures should still be considered.
Suitable for Assemblies Requiring Elastic Support
Compared with a standard flat washer, a conical washer provides elastic deformation and is suitable for mechanisms and equipment that require compensation for slight displacement, tolerance variation, or maintenance of contact pressure.
Reduces the Risk of Missing or Dropped Washers
Because the washer is retained on the screw, it helps reduce missing washers, dropped parts, incorrect orientation, or specification mix-ups during manual assembly, supporting greater consistency in high-volume production.
Improves High-Volume Assembly Efficiency
Operators only need to handle one complete fastener assembly and do not need to separately pick up the screw and conical washer. This helps reduce handling steps and shorten assembly time.
Suitable for Automated Feeding and Fastening
The pre-assembled structure helps reduce problems such as loose washers overlapping, flipping over, jamming, or falling off in vibratory bowls, feeding tracks, or automatic fastening equipment, making it suitable for automated assembly processes.
Actual feeding stability should still be tested according to the screw head type, screw length, washer outside diameter, and washer curvature.
Simplifies Purchasing and Inventory Management
Integrating the screw and conical washer into a single part number can reduce the number of items that need to be managed during purchasing, receiving, material issuing, and production-line preparation, helping lower the risk of washer specification mix-ups or shortages.
Customization Based on Drawings and Samples
W/COM.WAS. products can be customized according to customer engineering drawings or physical samples, including screw head type, drive type, thread diameter, thread pitch, length, washer inner and outside diameters, thickness, curvature, elasticity, materials, tolerances, and surface treatments.
Common Applications
W/COM.WAS. is commonly used in:
- Electronic and electrical equipment
- Machinery and automation equipment
- Automotive and motorcycle components
- Motors, fans, and transmission mechanisms
- Enclosures, cabinets, and sheet metal structures
- Home appliances and consumer products
- Telecommunications and information equipment
- Instruments and precision equipment
- Joints exposed to temperature changes or slight displacement
- Mass-production and automated fastening lines
Key Considerations When Selecting W/COM.WAS.
Before selection, confirm the screw thread diameter, thread pitch, length, head type, and drive type. The inner diameter, outside diameter, thickness, curvature, and installation orientation of the conical washer should also be checked against the design requirements.
Conical washers should be used within an appropriate compression range. If compression is insufficient, the washer may not generate enough elastic preload. If the screw is overtightened and the washer is completely flattened, its elastic compensation capability may be reduced and permanent deformation may occur.
The concave and convex orientation of the washer affects its loading behavior and elastic performance. Installation direction should therefore be confirmed according to the product drawing, screw head geometry, and workpiece contact conditions rather than being reversed arbitrarily.
For applications involving high temperatures, corrosive environments, repeated vibration, or high loads, the washer material, temperature resistance, fatigue life, and surface treatment should also be confirmed.
After repeated assembly and disassembly, the conical washer should be inspected for flattening, cracking, warping, or reduced elasticity. If it can no longer return to its original conical shape, replacement with a new component is recommended.
