S-92245A545 1/4"-20 x 1 3/8" FF-S-85, MS35307-311 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
• Rockwell B74 hardness provides excellent wear resistance and durability for repeated use
• Partially threaded UNC coarse design offers faster installation and improved vibration resistance
• External hex drive with 7/16" head width enables secure tool engagement and high-torque applications
• Precision Class 2A thread fit guarantees consistent mating with nuts and threaded holes
• Compliance with Fed. Spec. FF-S-85, RoHS 3, and REACH ensures regulatory adherence for global industrial applications

Professional Applications & Engineering Value

This 1/4"-20 x 1-3/8" partially threaded hex head screw delivers exceptional engineering value in demanding applications where corrosion resistance and mechanical strength are critical. The passivated 18-8 stainless steel material provides superior protection against rust and chemical exposure, making it ideal for marine, chemical processing, and outdoor equipment assemblies. The UNC coarse threading combined with partial threading design prevents loosening under vibration while facilitating quicker installation in production environments. With its external hex drive and substantial 1-3/8" length, this fastener offers optimal clamping force distribution in machinery, structural frameworks, and heavy-duty equipment where 70,000 psi tensile strength ensures long-term reliability and safety.

Specification Summary & Compliance

This hex head screw features precision Class 2A thread fit with 1/4"-20 UNC coarse threads and 3/4" minimum thread length. Manufactured to exacting standards including Fed. Spec. FF-S-85 (MS35307-311) with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The combination of Rockwell B74 hardness and controlled dimensional tolerances ensures consistent performance across industrial applications.