S-91358A502 0.657" ID x 1.323" OD ASME B18.2.6; ASTM F959 Type A490 Tension-Indicating Structural Washers

Key Features & Benefits at a Glance

• Orange tension-indicating dye provides clear visual confirmation of proper installation, reducing human error and ensuring consistent bolt tension in critical assemblies.
• High 24,000 lbs tension capacity delivers reliable performance for heavy-duty structural and industrial applications requiring superior load-bearing integrity.
• Durable steel construction with Rockwell C37 hardness ensures excellent wear resistance and long-term durability under high-stress conditions.
• Compliance with ASME B18.2.6 and ASTM F959 Type A490 standards guarantees dimensional accuracy, material quality, and performance consistency for engineering specifications.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for use in global markets and sensitive projects.
• Precise dimensions (0.657" ID, 1.323" OD) ensure a perfect fit for 5/8" screws, facilitating easy installation and optimal load distribution.
• Variable thickness (0.126-0.220") allows for minor adjustments in assembly, accommodating different gasket or surface requirements.

Professional Applications & Engineering Value

This 5/8" tension indicating washer is engineered to solve critical challenges in structural bolting and heavy machinery assembly, where precise bolt preload is essential for joint integrity. The orange tension-indicating dye provides an immediate visual cue when the specified 24,000 lbs tension is achieved, eliminating guesswork and preventing under or over-tightening that can lead to joint failure. Manufactured from high-strength steel with a Rockwell C37 hardness, it withstands vibrational loosening and dynamic loads in demanding environments like construction, bridgework, and industrial equipment. By integrating this inch system washer into your fastening strategy, you enhance safety, reduce maintenance costs, and ensure compliance with rigorous engineering standards.

Specification Summary & Compliance

This washer conforms to ASME B18.2.6 for dimensional standards and ASTM F959 Type A490 for material and performance requirements, ensuring precise fit for 5/8" screw sizes with an ID of 0.657" and OD of 1.323". The thickness range of 0.126-0.220" accommodates standard assembly tolerances. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and regulated industrial applications.