S-99926A101 4-40 x 3/16" 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 with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
- Precision thread engagement through Class 3A thread fit ensuring secure fastening and vibration resistance
- Optimized head design featuring undercut flat head profile with 100° countersink angle for flush mounting and reduced stress concentration
- Easy installation and removal with 1/16" hex drive providing positive torque transmission
- Versatile partial threading allowing precise clamp control in various material thicknesses
- Full regulatory compliance meeting RoHS 3 and REACH standards for global industrial applications
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical performance advantages in precision assembly applications. The 18-8 stainless steel material combined with passivated finish provides excellent corrosion resistance for demanding environments including marine, chemical processing, and outdoor equipment. The Class 3A thread fit ensures superior engagement with mating components, reducing the risk of cross-threading while maintaining consistent clamping force. The undercut flat head profile with 100° countersink angle enables flush mounting in precision machinery, electronic enclosures, and aerospace components where surface protrusion is unacceptable. The coarse thread spacing facilitates quick assembly in production environments while the partial threading allows engineers to optimize grip length for specific material stack-ups.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit tolerance and UNC thread form. The screw features a flat head with undercut profile and 100° countersink angle, 1/16" hex drive, and right-hand thread direction. Mechanical properties include 70,000 psi tensile strength and Rockwell B70 hardness. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial applications worldwide.
