HOME / FASTENER SOLUTIONS / WASHERS / LOCK WASHERS / HI COLLAR SPLIT LOCK WASHER PLAIN

Hi Collar Thru Hardened Split Lock Washer Plain Finish

Narrow Your Results By:

Hi-Collar Thru-Hardened Split Lock Washer with Plain Finish – Compact Strength for Precision Fastening

When assemblies demand maximum locking power in confined spaces, the hi-collar thru-hardened split lock washer with a plain finish delivers unmatched performance. Designed with a reduced outside diameter, this washer is specifically engineered to fit under socket head cap screws and other precision fasteners where space is limited and accuracy is critical.

Engineered for High-Torque, High-Precision Applications

Thru-Hardened for Uniform Strength

Manufactured from premium medium carbon steel, these hi-collar split lock washers undergo a full thru-hardening heat treatment process. Unlike surface-hardened alternatives, the entire washer cross-section is hardened to ensure consistent strength, superior fatigue resistance, and protection against crushing under extreme clamp loads. This makes them ideal for high-torque assemblies where maintaining preload is essential.

Narrow Profile for Tight Clearances

The hi-collar design features a smaller outer diameter compared to standard split lock washers. This allows the washer to seat properly within tight design envelopes and countersunk areas without interfering with surrounding components. It is particularly effective when paired with socket head cap screws in precision-machined equipment.

Plain Finish for Clean, Controlled Environments

The plain, uncoated finish provides a natural steel surface suited for indoor and dry applications. Without added plating, the washer ensures optimal metal-to-metal contact, improving friction and enhancing locking performance. It is a cost-effective solution for environments where corrosion resistance is not a primary concern.

Specifications & Standards

Material: Medium carbon steel
Hardening: Fully thru-hardened
Finish: Plain (uncoated)
Sizes: Fractional sizes from #4 to 1/2" and metric equivalents
Compliance: ASME B18.21.1 and DIN 7980

For aerospace assemblies, robotics, motorsports, electronics, and high-precision machinery, hi-collar thru-hardened split lock washers provide compact, vibration-resistant fastening you can trust.