S-92620A128 1/2"-28 x 2" 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
- Maximum load-bearing capacity with 150,000 psi tensile strength and Grade 8 classification for critical heavy-duty applications
- Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh industrial environments
- Precise thread engagement with UNEF extra fine thread spacing and Class 2A fit for vibration-resistant connections
- Enhanced installation control via external hex drive and 3/4" head width for secure tool engagement
- Optimized strength-to-weight ratio through Rockwell C33 hardness and partial threading design
- Reliable standardization meeting ASME B18.2.1 and SAE J429 specifications for quality assurance
- Versatile application compatibility with right-hand thread direction and 2" length for various assembly requirements
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value in demanding applications where vibration resistance and high tensile strength are critical. The UNEF extra fine thread (1/2"-28) provides superior thread engagement in thin materials and precision components, while the zinc yellow-chromate plating offers enhanced protection against corrosion in industrial environments. The partially threaded design concentrates strength where needed most, making these heavy-duty screws ideal for construction equipment, machinery assembly, and structural applications requiring reliable Class 2A thread fit. The external hex drive ensures secure tool engagement during installation, preventing stripping and maintaining 150,000 psi tensile strength under extreme loads.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 and SAE J429 standards, these hex head screws feature Class 2A thread fit for precise dimensional accuracy and UNEF extra fine thread spacing (28 TPI). The Grade 8 classification ensures consistent 150,000 psi tensile strength and Rockwell C33 hardness throughout production. Compliance with industry specifications guarantees reliable performance in critical applications requiring zinc yellow-chromate plating for corrosion resistance and partial threading for optimized strength distribution.
