S-95030A120 1/4"-28 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through the reliable cotter pin locking mechanism, preventing loosening in high-stress environments
• Enhanced corrosion protection with zinc-plated steel construction, extending service life in demanding industrial conditions
• Precise thread engagement with Class 2B fit and UNF fine threads, ensuring secure fastening and reduced risk of cross-threading
• Easy installation and removal using standard wrenches on the external hex drive, saving maintenance time and labor costs
• Optimized slot dimensions (0.072" min. depth, 0.07" min. width) for secure 1/16" cotter pin retention, maintaining locking integrity under dynamic loads
• Regulatory compliance assurance meeting REACH and RoHS 3 standards, supporting responsible sourcing and environmental regulations
• Durable standard hex profile with 7/16" width for reliable torque application and consistent performance in repetitive assembly operations

Professional Applications & Engineering Value

This zinc-plated steel castle locknut delivers critical safety and reliability in applications where vibration-induced loosening poses significant operational risks. The cotter pin locking mechanism provides permanent mechanical security, making it ideal for heavy machinery, automotive steering systems, agricultural equipment, and industrial rotating assemblies. The UNF fine thread configuration offers superior resistance to vibrational loosening compared to coarse threads, while the Class 2B thread fit ensures consistent engagement without binding. The zinc plating creates a sacrificial barrier against corrosion, extending service intervals in outdoor or harsh environments. Engineered for high-stress applications requiring fail-safe fastening solutions, this locknut combines traditional reliability with modern manufacturing precision.

Specification Summary & Compliance

This castle locknut features 1/4"-28 UNF fine threads with Class 2B thread fit for precise dimensional accuracy. The external hex drive measures 7/16" across flats with a 7/32" height, designed for standard wrench applications. The locking slot accommodates 1/16" diameter cotter pins with minimum slot dimensions of 0.072" depth and 0.07" width. Manufacturing complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) standards, ensuring environmental regulatory compliance for industrial use.