S-91268A107 1/4"-20 x 1 1/4" 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 industrial applications, reducing the risk of fastener failure.
- Grade 8 steel construction with Rockwell C33 hardness provides superior durability and resistance to wear, extending service life in demanding environments.
- Partial threading design allows for precise clamping force control and improved vibration resistance in assembled components.
- Coarse UNC thread spacing enables quick installation and removal, saving time in maintenance and assembly operations.
- Class 2A thread fit ensures consistent, reliable engagement with nuts and tapped holes, minimizing cross-threading issues.
- External hex drive offers easy tool access and high torque capability for secure fastening in confined spaces.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees interchangeability and quality consistency for engineering projects.
Professional Applications & Engineering Value
These Grade 8 hex head screws are engineered to address critical challenges in heavy machinery, automotive, and construction sectors where high tensile strength and vibration resistance are paramount. The 1/4"-20 UNC coarse thread design ensures rapid assembly while maintaining grip under dynamic loads, reducing downtime. Made from hardened steel with a Rockwell C33 rating, they resist deformation and shear forces in structural applications. The partial threading allows for optimized stress distribution along the shank, preventing joint loosening. Ideal for industrial fastening in equipment frames, engine components, and load-bearing assemblies, these screws deliver consistent performance where reliability cannot be compromised.
Specification Summary & Compliance
This 1/4"-20 UNC hex head screw adheres to Class 2A thread tolerance for precise fit and meets ASME B18.2.1 and SAE J429 manufacturing specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety. Dimensions include a 1 1/4" length with a minimum thread length of 3/4", providing reliable engagement in standardized applications.
