S-91241A420 4-40 x 1/2" 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 from 18-8 stainless steel with passivated finish, ideal for harsh environments.
- Reliable vibration resistance with an integrated 410 stainless steel spring lock washer to prevent loosening.
- High tensile strength of 70,000 psi ensures durability and load-bearing capability in demanding applications.
- Easy installation and removal with a Phillips No. 1 drive and standard pan head design.
- Precise thread fit (Class 2A) and coarse UNC threading for quick assembly and secure fastening.
- Fully threaded 1/2" length provides maximum grip and adjustability across the entire shank.
- Consistent performance backed by Rockwell B80 hardness and compliance with ASME B18.13 standards.
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 offers excellent resistance to rust and chemicals, making it suitable for outdoor equipment, marine hardware, and electronic enclosures. The integrated spring lock washer, made from 410 Stainless Steel, provides persistent locking force, eliminating the need for separate washers and reducing assembly time. With a coarse thread and Class 2A fit, it ensures quick, reliable fastening in materials like metal and plastic, enhancing productivity in manufacturing and maintenance operations.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with a Class 2A thread fit for standard tolerance and ease of use. It is fully threaded and right-hand oriented, with a length of 1/2 inch. The product complies with ASME B18.13 specifications for dimensional accuracy and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it meets environmental and safety regulations for global industrial use.
