S-91735A109 4-40 x 5/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws
Stainless Steel Pan Head Phillips 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 extended service life
- High tensile strength of 80,000 PSI ensures reliable fastening under significant mechanical stress and vibration
- Excellent thread engagement with coarse UNC threads and Class 2A fit for quick assembly and reduced cross-threading risks
- Optimized drive performance featuring a Phillips No. 1 drive and rounded pan head for secure torque application and flush mounting
- Full threading along the 5/8" length provides maximum grip and adjustability in various material thicknesses
- Consistent hardness (Rockwell B85) maintains structural integrity and prevents stripping or deformation during installation
- Compliance with industry standards including ASME B18.6.3, RoHS 3, and REACH for guaranteed quality and environmental safety
Professional Applications & Engineering Value
Engineered for demanding industrial settings, this 4-40 UNC Rounded Head Screw addresses critical challenges in machinery, electronics, and marine applications where corrosion resistance and mechanical reliability are paramount. The 316 Stainless Steel material, combined with a passivated finish, effectively resists chlorides and acidic exposures, reducing maintenance costs and downtime. Its coarse thread design and Class 2A thread fit facilitate rapid installation in soft metals or plastics, while the Phillips drive and rounded pan head ensure uniform clamping force without protrusions. Ideal for assembly lines, outdoor equipment, and precision instruments, this screw delivers long-term performance by minimizing galling and ensuring consistent 80,000 PSI tensile strength across cyclic loads.
Specification Summary & Compliance
This screw maintains precise Class 2A thread fit per UNC standards, with a diameter of 0.112" and coarse thread spacing for optimal engagement. Manufacturing adheres to ASME B18.6.3 specifications, ensuring dimensional accuracy and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances for safe use in global markets.
