S-92949A552 1/4"-20 x 2 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 for long-lasting performance in harsh environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness to withstand heavy-duty applications
- Precise thread engagement with Class 3A UNC coarse threads ensuring reliable fastening and vibration resistance
- Optimized drive efficiency featuring hex drive design for secure tool engagement and reduced cam-out during installation
- Full thread coverage along the entire 2-1/2" length provides maximum grip and load distribution
- Rounded head design offers improved aesthetics and reduced risk of snagging in assembled applications
- Regulatory compliance meets ASME B18.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
This 18-8 stainless steel rounded head screw delivers critical performance advantages in demanding industrial settings where corrosion resistance and mechanical reliability are paramount. The combination of 70,000 psi tensile strength and Rockwell B55 hardness ensures structural integrity under sustained loads, while the passivated finish provides enhanced protection against chemical exposure and oxidation. The UNC coarse threading with Class 3A fit enables rapid installation and superior vibration resistance in machinery, equipment assembly, and structural applications. The hex drive configuration allows for high-torque installation without stripping, making it ideal for maintenance-intensive environments where repeated disassembly may be required.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit tolerance for precision engagement. Features 1/4"-20 UNC coarse threads with right-hand orientation and full threading along the 2-1/2" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring suitability for regulated industries and international markets.
