S-91253A009 10-32 x 7/8" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws
Alloy 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
- Exceptional strength and durability with 130,000 psi tensile strength and Rockwell C39 hardness, ideal for high-stress industrial environments.
- Precise, reliable fastening due to Class 3A thread fit, ensuring tight tolerances and reduced risk of loosening under vibration.
- Corrosion-resistant black-oxide finish on alloy steel extends service life and maintains performance in demanding conditions.
- Optimal flush mounting with an 82° countersink angle and standard flat head profile for seamless integration into assemblies.
- Easy installation and removal using a standard 1/8" hex drive, saving time and reducing tooling complexity.
- Full threading for maximum grip along the 7/8" length, providing uniform clamping force and stability.
- Compliance with major industry standards including ASME B18.3 and ASTM F835, guaranteeing quality and interoperability.
Professional Applications & Engineering Value
These 10-32 UNF flat head screws are engineered to address critical challenges in precision assembly and machinery. The black-oxide alloy steel construction resists corrosion and wear, making them suitable for automotive, aerospace, and heavy equipment applications where exposure to oils and moisture is common. The fine thread spacing and Class 3A thread fit deliver superior vibration resistance and holding power, minimizing maintenance needs in dynamic systems. With a fully threaded design and 82° countersink angle, they ensure a secure, flush fit in countersunk holes, enhancing structural integrity and aesthetic finish. Ideal for use in industrial screws and flat head cap screws scenarios, they provide reliable performance in high-tensile and fatigue-prone environments.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit precision with UNF fine threads and a right-hand thread direction. It meets ASME B18.3 and ASTM F835 specifications for dimensional accuracy and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence for global supply chains.
