S-90275A552 1/4"-20 x 2 1/2" ASME B18.6.3 Steel Slotted Flat Head Screws
Steel Slotted 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 zinc-plated steel construction for extended service life in demanding environments
- Exceptional 60,000 psi tensile strength ensures reliable performance under heavy loads and vibration
- Precision Class 2A thread fit provides smooth installation and consistent clamping force
- 82° countersink angle allows for flush mounting in standard countersunk applications
- Fully threaded design maximizes engagement length and pull-out resistance
- Rockwell B70 hardness maintains thread integrity and prevents stripping during installation
- Slotted drive compatibility with standard tools for convenient installation and maintenance
Professional Applications & Engineering Value
This zinc-plated steel flat head screw with 1/4"-20 UNC coarse thread delivers critical performance advantages for industrial assembly applications. The combination of 60,000 psi tensile strength and Rockwell B70 hardness provides exceptional resistance to shear forces and vibration-induced loosening, making it ideal for machinery, equipment manufacturing, and structural applications. The fully threaded design ensures maximum thread engagement while the 82° countersink angle creates a flush surface finish, preventing snagging and maintaining aerodynamic profiles. These flat head slotted screws solve common fastening challenges by offering reliable performance in high-stress environments where corrosion resistance and mechanical strength are paramount.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent performance. Features UNC coarse threading with right-hand direction and standard flat head profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. All dimensions conform to inch system measurements with precise thread spacing and diameter control.
