S-90128A322 3/8"-16 x 1 5/8" ASME B18.3, ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket 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 170,000 PSI for reliable performance in high-stress applications and heavy machinery
- Superior corrosion resistance with zinc-plated alloy steel construction, extending service life in harsh industrial environments
- Precision Class 3A thread fit ensures secure, vibration-resistant fastening and reduces the risk of loosening
- Hex socket drive design allows for high-torque installation and removal in confined spaces with standard tools
- Coarse UNC threads provide faster assembly and better debris resistance compared to fine threads
- Partial threading offers optimal grip length control for precise clamping force distribution
- Full compliance with ASME B18.3 standards guarantees dimensional accuracy and interchangeability
Professional Applications & Engineering Value
This 3/8"-16 UNC Socket Head Cap Screw delivers critical engineering value where space constraints and high strength requirements intersect. The zinc-plated alloy steel construction provides excellent corrosion protection for outdoor equipment, automotive assemblies, and manufacturing machinery exposed to moisture and chemicals. The hex socket drive enables flush mounting and high-torque applications without protruding heads, while the coarse thread profile ensures rapid installation in production environments. With Rockwell C37 hardness and 170,000 PSI tensile strength, these screws maintain clamping force under extreme vibration and dynamic loads, preventing joint failure in critical connections. The partially threaded design allows precise positioning in tapped holes and structural components.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for superior dimensional accuracy. The UNC coarse thread (3/8"-16) follows standardized inch system requirements. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Meets ASTM A574 material specifications for alloy steel socket head cap screws, ensuring consistent mechanical properties and manufacturing quality.
