S-91251A189 8-32 x 3 1/4" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides consistent engagement and vibration resistance, enhancing assembly integrity.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining dimensional stability under repeated use.
- Partially threaded design allows for controlled clamping force and secure fastening in specific joint requirements.
- Coarse UNC threads enable quick installation and reduced cross-threading risks, saving time during assembly.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global supply chain integration.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these black-oxide alloy steel socket head cap screws address common challenges like corrosion and mechanical stress. The 8-32 UNC coarse thread design facilitates rapid installation in machinery, automotive, and equipment assembly, while the hex drive allows for high-torque application without slippage. With a partially threaded rod, they provide optimal grip in pre-tapped holes, preventing loosening from vibrations. The ASTM A574 compliance guarantees consistent material properties, making them ideal for high-strength fastening in construction, aerospace, and manufacturing sectors where durability and regulatory adherence are critical.
Specification Summary & Compliance
This screw features a Class 3A thread fit for tight tolerances, UNC coarse threads, and dimensions including a 3-1/4" length and 9/64" hex drive. It meets ASTM A574 specifications for material quality, and is certified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring no hazardous substances and adherence to international environmental standards.
