S-90306A224 1/4"-20 x 1" Left-Hand Threaded 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Corrosion-resistant 18-8 stainless steel construction ensures long-term durability in harsh environments, reducing maintenance costs and replacement frequency.
• Left-hand UNC coarse threading with Class 2A fit provides secure fastening in applications requiring reverse-thread engagement, preventing unintentional loosening under counter-clockwise motion.
• High tensile strength of 70,000 psi delivers reliable load-bearing capacity for heavy-duty industrial assemblies, minimizing risk of mechanical failure.
• Full threading along the 1" length maximizes grip range and distribution of clamping force, enhancing joint stability in varied material thicknesses.
• External hex drive design allows for high-torque installation with standard tools, speeding up assembly while reducing stripping risks.
• Rockwell B70 hardness rating offers excellent resistance to wear and deformation, maintaining thread integrity through repeated use.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and material traceability, supporting sustainable procurement policies.

Professional Applications & Engineering Value

Engineered for demanding scenarios where standard right-hand threads are unsuitable, this left-hand thread hex head screw solves critical reverse-rotation challenges in machinery, conveyor systems, and rotating equipment. The 18-8 stainless steel material inherently resists oxidation and chemical exposure, ideal for food processing, marine, or outdoor installations. Its UNC coarse threads and Class 2A fit facilitate quick alignment and robust engagement in metals or plastics, while the external hex drive head accommodates high wrenching torque without slippage. These attributes make it a preferred choice for maintenance-safe assemblies, preventing accidental disassembly in left-turning mechanisms and ensuring operational reliability under vibrational loads.

Specification Summary & Compliance

This screw adheres to Unified Coarse (UNC) thread standards with precision Class 2A tolerance for consistent fit and interchangeability. Dimensional accuracy includes a 1/4"-20 thread size, 1" length, and full threading per industrial norms. The product conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, verifying the absence of restricted hazardous substances and supporting compliance in global supply chains.