ASME B18.21.1 Spring Lock Washer CS Zinc Plated

ASME B18.21.1 Spring Lock Washer CS Zinc Plated is one of the most popular inch-size helical split lock washers for North American fastening markets. Fabricated from premium carbon steel substrate and finished with zinc plating, it balances low cost and dependable anti-vibration locking performance. When compressed during installation, the split ends of the washer create sustained spring pressure against bolt and nut bearing surfaces, which effectively stops self-loosening caused by recurring vibration and mechanical shock. It is engineered to perfectly cooperate with standard UNC threaded bolts and nuts, becoming a fundamental locking part for a huge variety of industrial assembly jobs.

Key Features

- High quality carbon steel raw material ensures stable hardness and spring retention after repeated compression

- Zinc plated finish offers reliable protection against mild rust and oxidation for indoor and sheltered outdoor environments

- Manufactured strictly following ASME B18.21.1 dimensional requirements to guarantee interchangeability

- Easy installation without special tools, suitable for automated assembly lines as well as manual field installation

- Full inch size range in stock, flexible for small trial orders and large bulk distribution orders alike

Technical Specification

Typical Application Scenarios

Many machinery OEMs, construction contractors and fastener wholesalers keep ASME B18.21.1 Spring Lock Washer CS Zinc Plated in regular inventory. It is widely adopted on agricultural machinery, conveyor system frames, light steel structures, water pump assemblies, truck body components and general equipment maintenance projects. It is frequently bundled together with hex bolts and hex nuts to form complete fastening kits for distributors. For equipment working under continuous vibration, this washer is a simple and economical anti-loose solution compared to expensive locking nuts.

Production & Quality Control

Our production line follows standardized manufacturing workflow from raw material cutting, stamping, heat treatment to surface plating. Each production batch will undergo random sampling inspection covering dimension tolerance, hardness, spring performance and coating integrity. Full batch trace records are reserved for quality review. Besides zinc plating, we also support alternative finishes such as hot dip galvanized and black oxide. If your project has special inspection reports or packaging requirements, our engineering team can arrange customized production accordingly.

Assembly Reminder

When assembling bolted connections, installers should note that ASME B18.21.1 Spring Lock Washer CS Zinc Plated belongs to inch series fastener components. It is not designed to match metric thread bolts, and mismatched threads will lead to assembly failure and poor locking effect.

Packing Solution

Standard export carton packing is adopted for bulk shipment to prevent collision, scratch and deformation damage during long ocean transit and multi-step handling. Heavy loads can choose sturdy wooden case packing for extra protection. We also support mixed-size packing service for fastener distributors who manage mixed SKU inventory and need flexible stock combinations.

FAQ

Q: How does this split lock washer achieve anti-loose effect?

A: The split helical structure generates continuous spring force after compression, resisting rotation loosening under vibration.

Q: Are other surface treatments available?

A: Yes, hot dip galvanized, black oxide finishes are available upon your request.

Q: Can samples be arranged for your project test?

A: Samples can be provided, buyers only need to bear the freight cost.

Q: What is the difference between spring lock washer and flat washer?

A: Flat washers mainly spread pressure, while this spring lock washer focuses on anti-loosening by spring tension.

Selection Tips

For heavy corrosion exposure such as coastal open-air projects, hot dip galvanized finish is recommended instead of regular zinc plating. If your design needs both pressure dispersion and anti-loosening, you can combine flat washer and ASME B18.21.1 Spring Lock Washer CS Zinc Plated in one bolt joint.