S-99926A105 4-40 x 1/2" Stainless Steel Hex Drive Flat Head Screws
Stainless Steel Hex Drive Flat Head 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 thanks to 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Exceptional thread reliability with Class 3A fit ensuring precise, secure fastening in demanding applications
- Optimized flush mounting featuring a 100° countersink angle and undercut flat head profile for seamless surface integration
- High mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for durable, long-lasting performance
- Efficient installation with 1/16" hex drive providing positive torque transmission and reduced cam-out risk
- Versatile partial threading allowing for controlled clamping force and secure engagement in various material thicknesses
- Full regulatory compliance meeting RoHS 3 and REACH standards for safe use in global industrial markets
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering solutions where corrosion resistance and precision threading are paramount. The 18-8 stainless steel material combined with passivated finish provides exceptional protection against oxidation and chemical exposure in manufacturing equipment, electronic enclosures, and marine applications. The Class 3A thread fit ensures vibration-resistant fastening in machinery subject to dynamic loads, while the undercut flat head design with 100° countersink angle prevents surface protrusion in precision assemblies. The coarse thread spacing and partial threading configuration offer superior pull-out resistance in softer materials and allow for precise tension control across various joint thicknesses.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit precision and UNC coarse thread specifications. These 1/2" length screws feature right-hand threading and maintain dimensional accuracy per industry standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial distribution worldwide.
