S-91286A151 1/4"-28 x 3" 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 tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness (Rockwell C33) provides excellent wear resistance, maintaining thread integrity through repeated use.
- Class 2A thread fit offers consistent assembly with standard nuts, improving installation efficiency and reducing cross-threading risks.
- Partially threaded design allows for precise clamping force control, ideal for applications requiring specific grip lengths.
- External hex drive enables easy installation with common tools, speeding up assembly in time-sensitive operations.
- Compliance with ASME B18.2.1 and SAE J429 ensures dimensional accuracy and interoperability, supporting quality assurance in regulated industries.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors where high tensile strength and durability are paramount. The zinc-flake coated steel construction combats corrosion in outdoor or chemically exposed settings, while the fine UNF threads and Class 2A fit provide secure, vibration-resistant connections. Its partially threaded shank allows for optimal load distribution, preventing joint loosening under dynamic stresses. By meeting ASME B18.2.1 standards, it ensures compatibility with existing components, reducing downtime and enhancing operational reliability in industrial fastening applications.
Specification Summary & Compliance
This screw features a 1/4"-28 UNF fine thread with Class 2A dimensional tolerance per inch system requirements, ensuring precise thread engagement. It complies with ASME B18.2.1 and SAE J429 specifications for mechanical properties and design. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for hazardous substances.
