S-91249A111 4-40 x 1/2" 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
- Exceptional corrosion resistance with Black-Oxide coated 18-8 Stainless Steel for long-lasting performance in harsh environments
- Superior holding power thanks to fully threaded UNC coarse design and 70,000 psi tensile strength for reliable fastening
- Optimized for high-torque applications with Phillips No. 1 drive and Rockwell B70 hardness preventing stripping
- Precise thread engagement with Class 2A fit ensuring consistent installation and vibration resistance
- Broad industrial compliance meeting ASME B18.6.3 standards plus RoHS 3 and REACH environmental regulations
- Easy installation in confined spaces with rounded pan head profile and standard 0.219" diameter
- Reliable right-hand threading providing secure fastening in standard assembly applications
Professional Applications & Engineering Value
These Black-Oxide 18-8 Stainless Steel Rounded Head Screws deliver critical corrosion protection and mechanical strength for demanding industrial environments. The 4-40 UNC coarse threading combined with fully threaded design ensures maximum thread engagement in thin materials and soft substrates, preventing pull-out failures. The Phillips No. 1 drive provides secure torque transmission while the rounded pan head offers a low-profile finish suitable for electronics enclosures, machinery panels, and automotive components. Engineered to withstand vibration and exposure to moisture, chemicals, and temperature variations, these screws solve common fastening challenges in industrial assembly where reliability and regulatory compliance are paramount.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent performance. The 4-40 UNC coarse thread (0.112" diameter) provides reliable fastening in various materials. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use in regulated industries. Dimensions include 1/2" length, 0.219" head diameter, and standard right-hand threading for universal compatibility.
