S-95318A122 20.95 mm ID x 40.64 mm OD ASME B18.2.6M; ASTM F959 Tension-Indicating Structural Washers

Key Features & Benefits at a Glance

• Visual tension verification through orange dye provides immediate confirmation of proper bolt preload, reducing installation errors and inspection time
• High 142,000 N load capacity ensures reliable performance in demanding industrial applications and heavy machinery assemblies
• Class 8.8 strength rating delivers superior mechanical properties for high-stress environments and critical connections
• Galvanized steel construction offers excellent corrosion resistance, extending service life in harsh operating conditions
• Precision metric dimensions (20.95mm ID, 40.64mm OD) ensure perfect fit with M20 fasteners and consistent performance
• Variable thickness design (3.600mm-6.000mm) accommodates different assembly requirements while maintaining tension indication accuracy
• Dual standard compliance with ASME B18.2.6M and ASTM F959 guarantees manufacturing consistency and engineering reliability

Professional Applications & Engineering Value

This M20 tension indicating washer solves critical bolting challenges in industrial applications where proper preload is essential for structural integrity. The galvanized steel material combined with Class 8.8 strength provides exceptional durability against vibration loosening and environmental factors. The innovative orange tension-indicating dye offers visual confirmation of correct installation, eliminating guesswork in critical assemblies like structural steel connections, heavy machinery, and construction equipment. Engineered to ASME B18.2.6M and ASTM F959 standards, these metric system washers deliver precise dimensional accuracy and reliable performance in high-load scenarios, making them ideal for maintenance, construction, and manufacturing applications where bolt tension verification is paramount for safety and operational reliability.

Specification Summary & Compliance

This tension indicating washer features precise metric dimensions with 20.95mm inner diameter and 40.64mm outer diameter, designed specifically for M20 screw applications. The washer maintains Rockwell C37 hardness and complies with ASME B18.2.6M and ASTM F959 manufacturing specifications. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting the latest environmental and safety regulations for industrial components. The tension indication system is calibrated to provide accurate visual confirmation at the specified 142,000 N load capacity, ensuring reliable performance in professional applications.