S-91241A412 4-40 x 1/4" ASME B18.13 Stainless Steel Pan Head Phillips Screws with Spring Lock Washer
Stainless Steel Pan Head Phillips Screws with Spring Lock Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh environments and extended service life.
- Reliable vibration resistance thanks to the integrated 410 Stainless Steel Spring Lock Washer, preventing loosening in dynamic applications.
- High mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for demanding assembly requirements.
- Effortless installation with the Phillips No. 1 drive and standard pan head profile, compatible with common tools.
- Precise and secure fastening ensured by the coarse UNC 4-40 thread with Class 2A fit for consistent engagement.
- Versatile fully threaded design allowing for maximum adjustability and holding power along the entire 1/4" length.
- Compliance and quality assurance meeting ASME B18.13, RoHS 3, and REACH standards for reliable and safe use.
Professional Applications & Engineering Value
This 4-40 UNC Rounded Head Phillips Screw is engineered to address critical challenges in industrial assembly, such as vibration-induced loosening and corrosion. The combination of 18-8 Stainless Steel and a passivated finish provides exceptional resistance to rust and chemical exposure, making it suitable for electronics, machinery, and outdoor equipment. The integrated Spring Lock Washer, made from 410 Stainless Steel, actively counters vibrational stresses, maintaining clamp load in high-cycle applications. With a coarse thread and Class 2A fit, it ensures quick, reliable installation and reduces cross-threading risks, enhancing assembly efficiency and reducing maintenance downtime in industrial screw applications.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 2A thread fit for standard dimensional accuracy. It is manufactured in compliance with ASME B18.13 specifications and is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations. The assembly includes a fully threaded 1/4" length and a spring lock washer with precise dimensions (0.25" OD, 0.015" thickness), providing consistent performance in various fastening scenarios.
