S-97093A129 12.2 mm ID x 21.1 mm OD DIN 128A Split Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with a curved split design that maintains constant spring tension under dynamic loads, preventing fastener loosening in industrial machinery.
• Enhanced corrosion protection from zinc-plated steel construction, ensuring long-term durability in harsh or humid operating environments.
• Reliable hardness and strength with Rockwell C44 rating, providing consistent performance and resistance to deformation under high-stress conditions.
• Precise dimensional fit for M12 screws with 12.2mm ID and 21.1mm OD, ensuring easy installation and optimal contact surface for secure fastening.
• Compliance with DIN 128A standards guarantees interchangeability, quality consistency, and adherence to recognized engineering specifications.
• Environmental regulation compliance with RoHS 3 and REACH, making it safe for use in regulated industries and global supply chains.
• Cost-effective maintenance solution by reducing the need for frequent retightening, lowering downtime and labor costs in assembly operations.

Professional Applications & Engineering Value

This M12 split lock washer is engineered to address common industrial challenges such as vibration-induced fastener failure and corrosion in demanding applications. The curved locking design and zinc-plated steel material work synergistically to provide a robust spring action that compensates for thermal expansion, material relaxation, and dynamic stresses. It is ideal for use in automotive assemblies, heavy machinery, electrical enclosures, and construction equipment where vibration resistance is critical. By conforming to DIN 128A standards, it ensures reliable performance in metric-based systems, reducing the risk of assembly errors and enhancing the service life of connected components under cyclic loading conditions.

Specification Summary & Compliance

This washer features precise dimensions: 12.2mm ID, 21.1mm OD, 2.0mm thickness, and 3.4mm overall height, designed for M12 screw sizes. It meets DIN 128A specifications for split lock washers, ensuring dimensional accuracy and functional reliability. The product is manufactured from zinc-plated steel with a hardness of Rockwell C44 and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its suitability for environmentally conscious and regulated industrial markets.