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Thru Hardened Heavy Split Lock Washer Plain Finish

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Thru-Hardened Heavy Split Lock Washer with Plain Finish – Maximum Locking Power for High-Load Assemblies

When your fastening system operates under extreme torque, vibration, and dynamic stress, the thru-hardened heavy split lock washer with plain finish delivers uncompromising performance. Engineered for industrial-grade applications, this heavy-duty lock washer is built to maintain clamp load and prevent fastener loosening in the most demanding environments.

Engineered for Strength and Durability

Thru-Hardened for Full-Body Toughness

Unlike standard surface-hardened washers, these heavy split lock washers undergo a complete thru-hardening heat treatment process. This ensures uniform hardness throughout the entire washer, significantly improving resistance to crushing, deformation, and embedding under high clamp loads. Manufactured from premium medium carbon steel, they are specifically designed for use with high-strength fasteners such as Grade 5, Grade 8, and ASTM A325 structural bolts.

Heavy-Duty Split Design

The thicker cross-section and reinforced helical split design provide enhanced spring tension compared to regular split lock washers. As torque is applied, the washer compresses and exerts continuous pressure against the nut or bolt head, helping resist loosening caused by vibration, impact, or thermal cycling. This makes them ideal for structural steel connections, heavy machinery, and industrial OEM assemblies.

Plain Finish – Cost-Effective Performance

The plain (uncoated) finish offers a clean, natural steel surface suitable for dry, indoor, or controlled environments. While it does not provide corrosion resistance like plated or galvanized options, it remains a cost-effective solution for applications where environmental exposure is minimal.

Specifications & Compliance

Material: Medium carbon steel
Hardening: Fully thru-hardened
Finish: Plain (uncoated)
Sizes: Fractional sizes from 1/4" to 1-1/2"
Standards: ASME B18.21.1 and SAE J489 compliant

For high-load, vibration-sensitive assemblies that require superior locking strength, thru-hardened heavy split lock washers with plain finish deliver the durability, reliability, and industrial performance professionals trust.