S-91251A933 1"-8 x 18" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket 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 tensile strength (170,000 psi) for reliable performance in high-stress applications, reducing failure risks.
- Corrosion-resistant black-oxide coating on alloy steel extends service life in demanding industrial environments.
- Class 3A thread fit ensures precise, secure fastening with minimal play, ideal for critical assemblies.
- 3/4" hex drive allows for high-torque installation with standard tools, speeding up assembly processes.
- Partially threaded design provides unthreaded shank for shear resistance and accurate clamping.
- 1"-8 UNC coarse threads enable quick engagement and reduced cross-threading in coarse-alignment scenarios.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global supply chains.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening and corrosion in heavy machinery. The 1"-8 UNC coarse thread and Class 3A fit deliver superior clamping force and alignment ease, minimizing assembly errors in equipment like presses, conveyors, and structural frames. With a Rockwell C37 hardness and robust 170,000 psi tensile strength, it withstands dynamic loads and harsh conditions, reducing maintenance downtime. The partially threaded rod design enhances shear strength, making it a reliable choice for bolted connections in construction and manufacturing sectors where durability and precision are paramount.
Specification Summary & Compliance
This screw adheres to inch system dimensions with a 1"-8 UNC coarse thread and Class 3A thread fit for high precision. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent mechanical properties. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable industrial use.
