S-98164A209 1/4"-20 x 3/8" 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 316 stainless steel construction and passivated finish, ideal for harsh environments and chemical exposure
- Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under heavy loads
- Precise Class 3A thread fit ensures secure fastening with minimal backlash in critical assembly applications
- Optimized hex drive design with 5/32" drive size provides superior torque transmission and reduces stripping risk
- Full threading coverage along the 3/8" length enables maximum grip and adjustment flexibility
- Rounded button head profile creates a low-profile, aesthetically clean finish while minimizing snag hazards
- Regulatory compliance assurance with RoHS 3 and REACH standards for global market acceptance
Professional Applications & Engineering Value
These 316 stainless steel rounded head screws deliver critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The combination of UNC coarse threading and Class 3A fit provides excellent engagement in both metals and plastics, reducing cross-threading incidents during high-volume assembly. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, making these hex drive screws ideal for marine equipment, chemical processing installations, and food processing machinery where frequent washdowns occur. With 70,000 psi tensile strength maintained across the fully threaded design, engineers can specify these fasteners for structural applications requiring predictable clamp load retention in vibrating environments.
Specification Summary & Compliance
This 1/4"-20 x 3/8" rounded head screw features UNC coarse threads with precision Class 3A thread fit for superior engagement. Manufactured to ASME B18.3 specifications (ASTM F879) with complete RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. The fastener delivers consistent dimensional accuracy with 0.437" head diameter, 0.132" head height, and 5/32" hex drive configuration for reliable tool engagement across production environments.
