S-92949A343 1/4"-20 x 4 1/2" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding, high-stress applications.
- Precise and secure fastening ensured by Class 3A thread fit and UNC coarse threading, providing reliable vibration resistance.
- Efficient installation and removal with a 5/32" hex drive and rounded button head design, allowing for high torque application in confined spaces.
- Full-length threading offers maximum grip and holding power along the entire 4-1/2" shank for robust assemblies.
- Guaranteed quality and interchangeability through compliance with the rigorous ASME B18.3 standard.
- Safe for regulated industries as it is fully compliant with RoHS 3 and REACH environmental regulations.
Professional Applications & Engineering Value
This 1/4"-20 UNC hex drive rounded head screw is engineered to solve critical fastening challenges in industrial settings. The 18-8 stainless steel material, enhanced by a passivated finish, provides excellent resistance to corrosion and oxidation, making it suitable for outdoor machinery, food processing equipment, and marine applications where moisture is a concern. The combination of coarse threading and a Class 3A thread fit ensures a tight, secure connection that resists loosening under vibration, a common failure point in heavy machinery and automotive assemblies. The rounded button head and hex drive design facilitate quick installation with standard tools, even in recessed or hard-to-reach areas, reducing assembly time and labor costs while maintaining a clean, low-profile appearance.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with a Class 3A precision fit for superior dimensional accuracy. It is manufactured in full compliance with the ASME B18.3 standard, ensuring consistent quality and performance. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.
