S-92949A849 1/4"-28 x 3" ASME B18.3, ASTM F879 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 and passivated finish, ideal for harsh industrial environments.
- High tensile strength of 70,000 psi ensures reliable load-bearing capacity and durability in demanding applications.
- Precise Class 3A thread fit provides secure, vibration-resistant connections with minimal risk of loosening.
- Hex drive design (5/32") allows for easy installation and high torque application without slipping.
- Fine UNF threading (1/4"-28) offers better adjustment control and stronger holding power compared to coarse threads.
- Rounded button head profile delivers a low-profile, finished appearance while reducing snagging risks.
- Full compliance with ASME B18.3, RoHS 3, and REACH guarantees industry-standard quality and environmental safety.
Professional Applications & Engineering Value
This 1/4"-28 x 3" stainless steel rounded head screw is engineered to address critical industrial challenges, such as vibration-induced loosening and corrosion in machinery, electronics, and structural assemblies. The 18-8 stainless steel material combined with a passivated finish significantly extends service life by resisting oxidation and chemical exposure. Its UNF fine thread and Class 3A precision fit ensure tight, reliable fastening in high-stress applications, reducing maintenance needs. The hex drive facilitates quick, secure installation with standard tools, enhancing workflow efficiency. Ideal for precision equipment, automotive components, and marine fixtures, this screw delivers consistent performance where corrosion resistance and thread accuracy are paramount.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit tolerances per UNF standards, ensuring precise engagement and reliability. It meets ASME B18.3 specifications for dimensional consistency and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances. Manufactured with a Rockwell B55 hardness and 70,000 psi tensile strength, it supports rigorous industrial demands while maintaining full threading for uniform load distribution.
