S-91257A965 1"-8 x 5" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex 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 load-bearing capacity with 150,000 psi tensile strength and Rockwell C33 hardness for reliable performance in high-stress applications.
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial environments.
- Optimized for heavy-duty assembly through coarse UNC threading and partial threading design, ensuring secure fastening and reduced installation time.
- Precise thread engagement with Class 2A thread fit, minimizing cross-threading risks and improving assembly reliability.
- High-torque installation capability due to the external hex drive and hex head design, allowing for efficient tightening with standard tools.
- Compliance with rigorous industry standards including ASME B18.2.1 and SAE J429, guaranteeing consistent quality and interchangeability.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substances.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, this Grade 8 hex head screw delivers robust performance where failure is not an option. The zinc yellow-chromate plated steel construction combats oxidation and chemical exposure, making it ideal for outdoor machinery, construction equipment, and automotive assemblies. Its 1"-8 UNC coarse thread and partial threading enhance grip in brittle materials and reduce stress concentration, while the external hex drive ensures straightforward installation even in confined spaces. By meeting ASME B18.2.1 and SAE J429 specifications, it provides dependable fastening in structural applications, minimizing downtime and maintenance costs.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances for consistent engagement and is manufactured in accordance with ASME B18.2.1 and SAE J429 standards. It fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from restricted hazardous substances. The 1"-8 UNC coarse thread and 5" length provide precise dimensional accuracy for reliable industrial use.
