S-91257A628 3/8"-16 x 1 1/2" 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
- Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh environments, minimizing maintenance and replacement costs.
- High hardness rating (Rockwell C33) provides excellent wear resistance, maintaining thread integrity and drive engagement over repeated use.
- Precise Class 2A thread fit with UNC coarse threading allows for easier assembly and secure fastening, even in vibration-prone settings.
- Partially threaded design offers optimal clamping force distribution, ideal for applications requiring precise joint control.
- External hex drive with standard head dimensions ensures compatibility with common tools, speeding up installation and reducing labor time.
- Compliance with major industry standards including ASME B18.2.1 and SAE J429 guarantees consistent quality and interchangeability.
Professional Applications & Engineering Value
Engineered for demanding environments, these Grade 8 hex head screws deliver robust performance in heavy machinery, construction equipment, and automotive assemblies. The steel construction combined with a zinc yellow-chromate finish effectively combats rust and chemical exposure, addressing common corrosion-related failures. The 3/8"-16 UNC coarse thread and partial threading enhance grip in brittle materials and distribute stress evenly, reducing the likelihood of loosening under dynamic loads. With a 1-1/2" length and external hex drive, they provide secure fastening in confined spaces, making them a reliable choice for structural frameworks, engine components, and industrial fixtures where vibration resistance and long-term durability are critical.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit tolerances and UNC coarse thread standards, ensuring precise dimensional accuracy. It meets ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners, with verified RoHS 3 and REACH compliance, confirming it is free from hazardous substances and suitable for regulated industries.
