S-95331A300 4.3 mm ID x 9 mm OD DIN 125 Plastic Washers

Key Features & Benefits at a Glance

• Exceptional thermal stability with a wide operating range from -30°F to 450°F, ideal for high-temperature environments without performance degradation.
• Superior mechanical strength due to Ultem PEI plastic construction, offering Rockwell M114 hardness for reliable load distribution and vibration resistance.
• Precision dimensional accuracy with 4.3 mm ID, 9 mm OD, and 0.7-0.9 mm thickness, ensuring perfect fit and alignment for M4 screws in metric assemblies.
• Compliance with DIN 125 standards guarantees consistent quality, interchangeability, and reliability in industrial applications.
• Enhanced chemical and environmental resistance from Ultem PEI material, reducing wear and extending service life in harsh conditions.
• Eco-friendly and safe design with RoHS 3 and REACH compliance, meeting stringent regulatory requirements for hazardous substance control.
• Lightweight and non-corrosive properties minimize assembly weight and prevent galvanic corrosion, suitable for electrical and sensitive equipment.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these M4 metric flat washers made from Ultem PEI plastic address critical challenges like thermal expansion, chemical exposure, and mechanical stress. The high-temperature resistance up to 450°F ensures stable performance in automotive, aerospace, and electronics applications, where heat can compromise metal components. With a precision flat design per DIN 125, they provide uniform clamping force, prevent loosening under vibration, and protect surfaces from damage. The Rockwell M114 hardness and tight dimensional tolerances (e.g., 4.3 mm ID for M4 screws) enable easy integration into metric systems, reducing assembly errors and maintenance costs. Ideal for electrical insulation and corrosive environments, these washers deliver long-term reliability without the weight or conductivity issues of metals.

Specification Summary & Compliance

This flat washer adheres to DIN 125 specifications for dimensional accuracy, with an inner diameter of 4.3 mm, outer diameter of 9 mm, and thickness ranging from 0.7 to 0.9 mm, designed for M4 screw sizes in metric systems. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no restricted substances are used. The material, Ultem PEI plastic, meets hardness standards (Rockwell M114) and operates within a temperature range of -30°F to 450°F, supporting applications requiring high thermal and mechanical performance.