S-94444A111 5/16"-18 x 1 1/4" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws
18-8 Stainless 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 corrosion resistance with Black-Oxide 18-8 Stainless Steel construction, ideal for harsh industrial environments and outdoor applications.
- High tensile strength of 80,000 psi ensures reliable load-bearing capacity and prevents failure under heavy mechanical stress.
- Rockwell B70 hardness provides excellent wear resistance and maintains thread integrity during repeated installations.
- Fully threaded design offers maximum grip and uniform clamping force along the entire length for secure fastening.
- Coarse UNC threads with Class 2A fit enable quick assembly, reduce cross-threading risks, and ensure consistent performance.
- External hex drive and hex head allow for easy installation with standard tools, speeding up maintenance and repair tasks.
- Compliance with ASME B18.2.1, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety regulations.
Professional Applications & Engineering Value
This 5/16"-18 UNC hex head screw is engineered to address critical challenges in industrial settings, such as vibration loosening and corrosion-induced failures. The Black-Oxide 18-8 Stainless Steel material provides a durable barrier against moisture and chemicals, extending service life in demanding applications like machinery assembly, structural frameworks, and outdoor equipment. The coarse thread design enhances engagement in softer materials or where rapid installation is essential, while the fully threaded body distributes stress evenly, reducing the risk of shear under high loads. Ideal for use in construction, automotive, and manufacturing industries, this screw ensures reliable performance where high tensile strength and regulatory compliance are non-negotiable.
Specification Summary & Compliance
This screw features precise Class 2A thread fit and UNC coarse threads with a diameter of 0.3125" and length of 1-1/4", manufactured to ASME B18.2.1 specifications for dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial use.
