S-92949A904 4-48 x 3/16" 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 environments
- Exceptional holding power with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term fastening
- Precise thread engagement through Class 3A thread fit and UNF fine threads, minimizing vibration loosening
- Easy installation and removal with 1/16" hex drive and fully threaded design for consistent torque application
- Low-profile rounded button head provides a finished appearance while reducing snagging risks
- Compliance with industry standards including ASME B18.3, ensuring consistent quality and interchangeability
- Environmental regulation adherence with RoHS 3 and REACH compliance for global supply chain compatibility
Professional Applications & Engineering Value
These 4-48 UNF fine thread rounded button head screws deliver critical performance in precision assemblies where vibration resistance and corrosion protection are paramount. The 18-8 stainless steel material combined with passivated finish creates a durable barrier against chemical exposure and oxidation, extending service life in industrial equipment, electronics enclosures, and marine components. The Class 3A thread fit ensures tighter tolerances than standard fasteners, preventing backlash in sensitive instrumentation while the fully threaded design maximizes engagement in thin materials. With their low-profile rounded head and hex drive, these screws provide flush mounting solutions where clearance is limited, making them ideal for OEM manufacturing and maintenance applications requiring reliable, precision fastening.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit for superior dimensional accuracy. Features UNF fine threads (4-48) with right-hand orientation and fully threaded construction. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
