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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 – Industrial-Grade Locking Strength for Demanding Applications

For high-strength assemblies that demand maximum locking performance, the thru-hardened heavy split lock washer with a plain finish is the rugged, no-nonsense choice. Built for extreme mechanical loads and vibration-prone environments, this washer is engineered to maintain bolt tension and resist loosening under dynamic stress.

Manufactured from high-quality medium carbon steel, these washers undergo a thru-hardening heat treatment process—not just surface hardening—ensuring that the entire body of the washer is hardened for maximum toughness and durability. The heavy-duty design features thicker cross-sections compared to standard split lock washers, making them ideal for use with high-strength bolts, including Grades 5, 8, and ASTM A325.

The plain finish provides a clean, uncoated surface ideal for dry indoor environments or applications where external coatings aren’t required. While it doesn’t offer corrosion resistance like plated washers, the plain finish makes this washer cost-effective and ideal for tightly controlled environments.

Material & Coating:

  • Material: Medium carbon steel

  • Hardening: Thru-hardened to meet or exceed performance standards

  • Finish: Plain (uncoated)

Dimensions & Tolerances:

  • Conforms to ASME B18.21.1 and SAE J489

  • Available in standard inch sizes from 1/4" to 1-1/2"

  • Precision tolerances ensure proper fit and function in high-load assemblies

Mechanical Properties:

  • Full-body hardness enhances resistance to crushing and deformation

  • Spring tension resists loosening under vibration and torque

  • Compatible with structural and heavy hex bolts

Applications:

  • Structural steel and construction

  • Heavy equipment and machinery

  • Automotive, railroad, and mining

  • Agricultural and industrial OEM assemblies

For jobs that demand uncompromising strength and locking power, thru-hardened heavy split lock washers with plain finish are the trusted, industrial-grade solution. Need help sourcing or selecting? Our fastening experts are here for you.