S-91882A430 1/4"-20 x 1 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Superior hand-tightening grip with a fully knurled round head, eliminating the need for tools in quick-adjustment scenarios.
• Enhanced corrosion resistance from the black-oxide steel finish, ensuring durability in various industrial environments.
• High tensile strength of 70,000 psi provides reliable clamping force and resistance to deformation under load.
• Coarse UNC 1/4"-20 threads with Class 2A fit allow for rapid installation and secure fastening in a wide range of materials.
• Fully threaded 1-1/4" length offers maximum engagement and adjustability for diverse assembly depths.
• Rockwell B84 hardness ensures the screw maintains its form and thread integrity through repeated use.
• Compliance with RoHS 3 and REACH regulations guarantees safety and environmental responsibility in global supply chains.

Professional Applications & Engineering Value

This black-oxide steel thumb screw is engineered to address common industrial challenges such as frequent adjustments and exposure to harsh conditions. The knurled head provides a non-slip surface, enabling secure hand-tightening without tools, which is ideal for maintenance panels, machinery guards, and electronic enclosures where quick access is essential. Made from robust steel with a UNC coarse thread and Class 2A fit, it ensures easy starts and strong holding power in metals and plastics, reducing assembly time and minimizing cross-threading risks. The black-oxide finish adds a layer of oxidation resistance, prolonging service life in environments with moderate moisture or chemicals. Fully threaded along its 1-1/4" length, it accommodates various material thicknesses, making it a versatile choice for OEM and MRO applications across sectors like automotive, aerospace, and industrial equipment.

Specification Summary & Compliance

This thumb screw features precise 1/4"-20 UNC coarse threads with a Class 2A thread fit for consistent performance and interchangeability. It adheres to common inch-system standards and is manufactured from steel with a tensile strength of 70,000 psi and Rockwell B84 hardness. The product is fully compliant with RoHS 3 (2015/863/EU), including exemption 6(a)-I for lead, and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety requirements for industrial use.