S-99607A251 5/16"-18 x 1 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Superior grip and tool-free operation with knurled head texture for easy hand tightening and loosening in tight spaces
• Excellent corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
• High tensile strength of 80,000 psi ensures reliable, durable fastening under heavy loads and vibration
• Easy installation and precise fit with Class 2A thread fit and coarse UNC threads for quick assembly
• Enhanced stability and load distribution from the flared collar design, reducing surface damage
• Full 1 1/4" threading provides maximum engagement and secure fastening across the entire length
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and global market suitability

Professional Applications & Engineering Value

This 18-8 stainless steel thumb screw is engineered to solve common industrial challenges, such as frequent adjustments and exposure to corrosive elements. The knurled head offers exceptional grip, enabling quick, tool-free operation in machinery, electrical enclosures, and assembly jigs where space is limited. Its coarse UNC threads and Class 2A fit ensure fast, accurate installation, reducing assembly time and minimizing cross-threading risks. The flared collar distributes clamping force evenly, protecting sensitive surfaces from damage. With high tensile strength and corrosion resistance, it delivers long-term reliability in demanding applications like automotive, HVAC, and manufacturing equipment.

Specification Summary & Compliance

This thumb screw features precise 5/16"-18 UNC coarse threads with Class 2A thread fit for consistent dimensional accuracy. It is manufactured from 18-8 stainless steel with a hardness of Rockwell B85 and tensile strength of 80,000 psi. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets strict environmental and safety standards for industrial use.