S-99926A135 1/4"-20 x 3/8" 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, long-term performance
- Precise Class 3A thread fit ensures secure, vibration-resistant fastening in demanding applications
- Efficient hex drive design (1/8") allows for high-torque installation and easy maintenance access
- Optimized flush seating with 100° countersink angle and undercut flat head profile for smooth, professional finishes
- Reliable partial threading provides controlled grip length and reduces risk of cross-threading during assembly
- Full regulatory compliance with RoHS 3 and REACH standards for safe, sustainable use in global markets
Professional Applications & Engineering Value
These 1/4"-20 UNC flat head screws deliver critical performance in industrial settings where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel material, combined with a passivated finish, provides excellent protection against chemical exposure and atmospheric corrosion. The Class 3A thread fit and coarse thread spacing ensure rapid assembly with minimal cross-threading risk, while the hex drive design accommodates high installation torque. The undercut flat head with 100° countersink angle creates flush surfaces in machinery, electronic enclosures, and structural components, preventing snagging and maintaining aerodynamic profiles. These partially threaded fasteners are engineered for applications requiring precise clamp load control without compromising joint integrity.
Specification Summary & Compliance
This flat head screw features 1/4"-20 UNC coarse threads with Class 3A precision tolerance for superior fit. Manufacturing adheres to inch system standards with right-hand thread direction and partial threading up to 0.24" minimum length. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and unrestricted use in industrial supply chains.
