S-97181A103 4-40 x 1/2" ASME B18.6.3 Stainless Steel Pan Head Combination Phillips/Slotted Screws
Stainless Steel Pan Head Combination Phillips/Slotted 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 in harsh environments thanks to 316 Stainless Steel construction with passivated finish
- Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable load-bearing performance
- Optimized drive engagement through Phillips/Slotted No. 1 drive combination preventing cam-out during installation
- Precision thread fit with Class 2A UNC coarse threads ensuring consistent clamping force and vibration resistance
- Full-length threading provides maximum grip length and flexibility in material thickness applications
- Standardized pan head profile offers clean appearance and increased bearing surface for secure fastening
- Regulatory compliance meets critical industry standards including ASME B18.6.3, RoHS 3, and REACH
Professional Applications & Engineering Value
These 316 Stainless Steel rounded head screws deliver exceptional performance in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The passivated finish enhances the natural corrosion resistance of 316 stainless, making these 4-40 UNC coarse thread fasteners ideal for chemical processing equipment, marine applications, and food processing machinery where exposure to moisture and aggressive substances is common. The combination of Phillips/Slotted drive provides installation flexibility while the Class 2A thread fit ensures consistent clamping force in vibration-prone assemblies. The fully threaded design allows for maximum engagement in various material thicknesses, while the rounded pan head profile distributes pressure evenly without marring surfaces.
Specification Summary & Compliance
This 4-40 UNC screw features precision Class 2A thread fit with coarse thread spacing, manufactured to exacting ASME B18.6.3 specifications. The fastener maintains dimensional accuracy with 1/2" length, 0.219" head diameter, and standard pan head profile. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety standards are met for global industrial applications.
