Three Components Pre-Assembled as One Unit
The screw, spring washer, and flat washer are assembled together during production. The complete fastener can be installed directly without placing two separate washers onto the screw on the production line, helping simplify the assembly process.
Flat Washer Helps Distribute Fastening Pressure
The flat washer increases the contact area between the screw head and the workpiece, allowing fastening force to be distributed more evenly. This helps reduce indentation or localized deformation caused by the screw head pressing directly around the mounting hole.
Actual performance will still depend on the workpiece material, thickness, hole diameter, and tightening torque.
Spring Washer Provides Auxiliary Anti-Loosening Performance
After the screw is tightened, the spring washer provides a certain degree of elastic pressure and frictional resistance, helping reduce the possibility of rotational loosening caused by general vibration or equipment operation.
For high-vibration, repeated-impact, or safety-critical applications, additional anti-loosening methods should still be evaluated.
Reduces the Risk of Missing Washers
Because both washers are retained on the screw, the risk of missing washers, incorrect assembly order, or washers falling off during manual assembly can be reduced. This helps maintain assembly consistency in high-volume production.
Improves Production-Line Assembly Efficiency
Operators only need to handle one complete fastener assembly, eliminating the need to separately pick up the screw, flat washer, and spring washer. This makes W/SPW & FLT/W. suitable for mass production and assembly lines with demanding cycle-time requirements.
Simplifies Purchasing and Inventory Management
Integrating three individual components 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. It also helps reduce the risk of mixing washers of different sizes or running short of individual components.
Suitable for Automated Feeding and Fastening
The pre-assembled structure helps reduce problems such as loose washers jamming, overlapping, or becoming incorrectly oriented in vibratory bowls, feeding tracks, or fastening equipment, making it suitable for automated assembly systems.
Actual automated feeding performance should still be tested according to the screw head type, screw length, and washer outside diameter.
Multiple Screw and Washer Specifications Available
Different screw head types, drive styles, thread specifications, and washer dimensions can be selected according to installation space, assembly tools, contact surfaces, and fastening requirements.
Customization Based on Drawings and Samples
W/SPW & FLT/W. products can be customized according to customer engineering drawings or physical samples, including screw head type, drive type, thread diameter, thread pitch, length, flat washer dimensions, spring washer type, materials, tolerances, and surface treatments.
Common Applications
W/SPW & FLT/W. is commonly used in:
- Electronic and electrical equipment
- Machinery and automation equipment
- Automotive and motorcycle components
- Enclosures, cabinets, and sheet metal structures
- Home appliances and consumer products
- Telecommunications and information equipment
- Instruments and precision equipment
- Furniture and general hardware assemblies
- Mass-production and automated fastening lines
Key Considerations When Selecting W/SPW & FLT/W.
When selecting W/SPW & FLT/W., first confirm the screw thread diameter, thread pitch, length, head type, and drive type. The inner diameter, outside diameter, and thickness of both the flat washer and spring washer should also be checked against the available installation space.
The flat washer should provide sufficient contact area without interfering with surrounding components. If the installation space is limited, the washer outside diameter and screw head dimensions should be confirmed in advance.
The spring washer is an auxiliary anti-loosening component and does not guarantee that screw loosening will be completely prevented in every vibration environment. For high-vibration, high-impact, or safety-critical applications, thread-locking compounds, lock nuts, mechanical locking structures, or other suitable anti-loosening methods should also be evaluated.
After repeated disassembly, the spring washer should be inspected for flattening, deformation, cracking, or reduced elasticity. If the washer can no longer return to its original shape, replacement with a new component is recommended.
