S-90121A540 1/4"-20 x 3/4" ASME B18.2.1 Stainless Steel Wire-Lockable Hex Head Screws
Stainless Steel Wire-Lockable 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 corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
- High tensile strength of 70,000 psi ensures secure, durable fastening under significant mechanical stress.
- Excellent thread engagement provided by UNC coarse threading and Class 2A fit, enabling quick assembly and reduced cross-threading risk.
- Easy installation and removal with an external hex drive and standard 7/16" head width, compatible with common wrenches.
- Full threading along the 3/4" length offers maximum grip and adjustability in various material thicknesses.
- Consistent performance and interchangeability guaranteed by compliance with ASME B18.2.1 standards.
- Environmentally safe usage with RoHS 3 compliance, free from hazardous substances.
Professional Applications & Engineering Value
This 18-8 stainless steel hex head screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and high-stress demands. The UNC coarse thread and Class 2A thread fit provide reliable fastening in metals, plastics, and assemblies, reducing installation time and improving joint integrity. With a Rockwell B70 hardness and 70,000 psi tensile strength, it withstands dynamic loads in machinery, automotive, and construction applications. The external hex drive ensures torque resistance, while the fully threaded design allows for versatile use in varying grip lengths, making it a go-to industrial fastener for durable, corrosion-resistant solutions.
Specification Summary & Compliance
This screw adheres to ASME B18.2.1 specifications, ensuring dimensional accuracy and performance. It features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for standard tolerance, a length of 3/4", and full threading. The product is compliant with RoHS 3 (2015/863/EU) regulations, confirming it is free from restricted hazardous substances, suitable for global industrial and electronic applications.
