S-92245A963 1/2"-20 x 2 1/2" FF-S-85, MS35308-417 Mil. Spec. 18-8 Stainless Steel Hex Head Screws
Mil. Spec. 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 passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- High tensile strength of 70,000 psi ensures reliable performance in demanding heavy-duty applications
- Precise Class 2A thread fit guarantees smooth assembly and secure fastening with reduced risk of cross-threading
- External hex drive design provides excellent torque transmission and easy installation with standard tools
- Fine UNF thread spacing delivers superior vibration resistance and improved load distribution
- Partially threaded shank allows for controlled clamping force and prevents loosening under dynamic loads
- Rockwell B74 hardness maintains thread integrity and durability through repeated use
Professional Applications & Engineering Value
This 1/2"-20 UNF hex head screw delivers exceptional engineering value in industrial settings where corrosion resistance and mechanical reliability are critical. The passivated 18-8 stainless steel construction provides superior protection against rust and chemical degradation, making it ideal for marine, chemical processing, and outdoor applications. The fine UNF thread spacing and Class 2A thread fit ensure precise engagement with mating components, reducing the risk of vibration-induced loosening in machinery and structural assemblies. With its external hex drive and partially threaded design, this fastener offers optimal torque transmission and controlled clamping force for heavy equipment, manufacturing systems, and infrastructure projects requiring long-term fastening integrity.
Specification Summary & Compliance
This hex head screw features Class 2A thread fit with 1/2"-20 UNF fine threads and meets Fed. Spec. FF-S-85 (MS35308-417) manufacturing standards. The fastener complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring material safety and regulatory compliance for industrial applications worldwide.
