S-91247A024 1/4"-28 x 3" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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
- Superior tensile strength - 120,000 psi rating ensures reliable performance in high-stress industrial applications
- Enhanced corrosion resistance - Zinc plating provides durable protection against environmental elements
- Precision thread engagement - Class 2A thread fit and UNF fine thread design deliver consistent, vibration-resistant connections
- Optimized load distribution - Partially threaded design with 3/4" minimum thread length concentrates strength where needed most
- High-grade material performance - Grade 5 steel with Rockwell C25 hardness maintains integrity under repeated use
- Industry-standard compatibility - Meets ASME B18.2.1 and SAE J429 specifications for reliable interchangeability
- Easy installation and removal - External hex drive and 7/16" head width allow for standard tool access
Professional Applications & Engineering Value
These Grade 5 hex head screws deliver exceptional engineering value in demanding industrial environments where vibration resistance and structural integrity are critical. The UNF fine thread configuration provides superior holding power compared to coarse threads, making them ideal for machinery assembly, automotive components, and equipment manufacturing where precise torque requirements and secure fastening are essential. The zinc plated finish extends service life in moderately corrosive conditions, while the partially threaded design ensures optimal clamp load distribution. With 3/4" minimum thread length and external hex drive, these screws offer reliable installation in confined spaces and high-torque applications across various industrial sectors.
Specification Summary & Compliance
This 1/4"-28 hex head screw features precision Class 2A thread fit tolerance with UNF fine thread spacing and right-hand thread direction. Manufactured to exacting ASME B18.2.1 and SAE J429 standards, ensuring dimensional consistency and mechanical performance. The fastener maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring verified material safety and environmental responsibility.
