S-91133A193 1.312" ID Square Washers

Key Features & Benefits at a Glance

• Superior load distribution with a 4" square design that minimizes surface pressure and prevents material damage in heavy-duty applications
• Enhanced corrosion resistance thanks to the galvanized steel construction, ensuring long-term durability in harsh industrial environments
• Precise fit for 1 1/4" screws with a 1.312" inner diameter, providing secure fastening and reducing installation errors
• Exceptional mechanical strength backed by Rockwell B40 hardness, maintaining structural integrity under high stress and vibration
• Reliable thickness range of 0.220-0.280" for consistent performance and compatibility with standard inch-system components
• Full regulatory compliance with RoHS 3 and REACH standards, ensuring environmental safety and global market acceptance
• Versatile industrial application in construction and machinery where heavy load-bearing and corrosion protection are critical

Professional Applications & Engineering Value

This heavy-duty square washer addresses common engineering challenges in industrial settings, such as uneven load distribution and fastener loosening under dynamic loads. The galvanized steel material provides a robust barrier against moisture and chemicals, significantly extending service life in outdoor construction, structural steelwork, and machinery assembly. Its 4" width and 0.220-0.280" thickness ensure optimal surface contact, reducing point stress on soft materials like wood or composite panels. Designed for 1 1/4" screws with a precise 1.312" ID, it minimizes play and enhances joint stability in high-vibration environments, making it ideal for bridge construction, heavy equipment manufacturing, and infrastructure projects where reliability is non-negotiable.

Specification Summary & Compliance

This washer conforms to inch system measurement standards with critical dimensions including 1.312" inner diameter, 4" width, and 0.220-0.280" thickness range. Manufactured from galvanized steel with a Rockwell B40 hardness rating, it meets industrial-grade mechanical requirements. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and REACH (EC 1907/2006) regulations as of January 17, 2023, ensuring adherence to environmental and safety protocols for global industrial use.