S-91150A130 0.768" ID x 1.26" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth that bite into mating surfaces to prevent loosening under extreme dynamic loads
• Exceptional durability provided by Grade 8 strength classification and Rockwell C44 hardness for long service life in demanding applications
• Enhanced corrosion protection through zinc plating that extends component lifespan in industrial environments
• Precision dimensional fit with 3/4" screw size compatibility and carefully controlled ID/OD specifications for reliable installation
• Regulatory compliance assurance meeting both RoHS 3 and REACH environmental standards for safe industrial use
• Proven performance reliability manufactured to ASME B18.21.1 specifications for consistent quality and performance
• Optimized load distribution with precise thickness control (0.073-0.083") that maintains clamping force without compromising assembly integrity

Professional Applications & Engineering Value

This Grade 8 zinc-plated steel tooth lock washer delivers critical vibration resistance in heavy machinery, construction equipment, and automotive assemblies where dynamic loads threaten fastener integrity. The internal tooth design creates multiple biting points that dig into both the fastener head and base material, creating mechanical interference that counters rotational loosening. Engineered with Rockwell C44 hardness, these washers maintain their spring tension and tooth sharpness through repeated stress cycles, unlike conventional washers that may deform under heavy loads. The zinc-plated steel construction provides essential corrosion protection while maintaining the electrical conductivity often required in grounding applications. For industrial maintenance teams and OEM manufacturers, this washer solves the persistent challenge of fastener loosening in high-vibration environments, reducing maintenance frequency and preventing equipment downtime.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 specifications with inch system dimensions: 0.768" ID, 1.26" OD, and thickness range of 0.073-0.083" for 3/4" screw applications. The Grade 8 classification ensures high tensile strength and reliability in demanding fastening systems. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental and safety standards for industrial components. The internal tooth configuration provides consistent locking performance across various material surfaces while maintaining dimensional precision for reliable installation.