S-92245A755 1/2"-20 x 1 1/2" FF-S-85, MS35308-413 Mil. Spec. 18-8 Stainless Steel Hex Head Screws

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 load-bearing capacity and joint integrity under stress
• Fine UNF thread with Class 2A fit provides precise engagement and vibration resistance in critical assemblies
• Partially threaded design allows for secure clamping while minimizing thread damage during installation
• External hex drive with 3/4" head width delivers high torque transmission and easy installation with standard tools
• Compliance with Fed. Spec. FF-S-85 (MS35308-413) guarantees consistent quality and interchangeability
• RoHS 3 and REACH compliance ensures environmental safety and regulatory acceptance in global markets

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this 1/2"-20 UNF hex head screw combines passivated 18-8 stainless steel with a fine thread design to solve common fastening challenges. The material's inherent corrosion resistance protects against chemical exposure and moisture, extending service life in machinery, structural frames, and outdoor equipment. The partially threaded shank concentrates clamping force precisely where needed, preventing loosening from vibration—a critical advantage in automotive, aerospace, and heavy machinery assemblies. With a 70,000 psi tensile strength and Rockwell B74 hardness, it maintains integrity under dynamic loads, while the external hex drive ensures efficient installation in confined spaces. Ideal for OEM and MRO applications requiring Class 2A thread fit and regulatory compliance.

Specification Summary & Compliance

This hex head screw adheres to Class 2A thread tolerances for consistent fit and UNF fine thread standards (1/2"-20). Manufacturing follows Fed. Spec. FF-S-85 (MS35308-413) for dimensional accuracy, with a minimum thread length of 1 1/4" and overall length of 1 1/2". The product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for industrial use.