S-90282A217 5/16"-18 x 2 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and torque application with a fully knurled 1 1/8" diameter head for secure hand-tightening in industrial settings.
• Reduced surface damage and marring thanks to the permanent swivel tip, which accommodates a 7.5° maximum angle for misalignment compensation.
• Superior corrosion resistance and durability provided by the black-oxide steel finish, extending the component's service life.
• High mechanical strength for demanding applications, with a tensile strength of 80,000 psi and a Rockwell B85 hardness rating.
• Reliable and fast assembly ensured by the 5/16"-18 UNC coarse thread with a Class 2A fit for consistent engagement.
• Space-saving low-profile design with a round head height of just 7/16", ideal for compact assemblies.
• Compliance with major environmental regulations, including RoHS 3 and REACH, for use in regulated industries.

Professional Applications & Engineering Value

This black-oxide steel thumb screw is engineered to solve common industrial fastening challenges. The low-profile round head with a knurled texture provides exceptional manual grip, eliminating the need for tools in frequent adjustment scenarios such as panel access, machinery guards, and electronic enclosures. The integrated permanent swivel tip is critical for applications where perpendicular alignment is difficult, preventing cross-threading and damage to sensitive surfaces. Manufactured from high-strength steel with an 80,000 psi tensile strength and a Rockwell B85 hardness, it withstands repeated use and high-stress conditions. The 5/16"-18 UNC coarse thread ensures quick installation and robust holding power, making it a reliable choice for maintenance, manufacturing, and OEM equipment.

Specification Summary & Compliance

This thumb screw features a 2 1/2" length and is fully threaded with a 5/16"-18 UNC coarse thread and a Class 2A thread fit for standard tolerance and reliable performance. The right-hand thread direction is standard for most applications. It is compliant with RoHS 3 (2015/863/EU) under exemption 6(a)-I and is REACH (EC 1907/2006) compliant, ensuring it meets stringent environmental and safety regulations for industrial components.