S-90017A592 5/16"-18 x 1 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior hand-tightening capability with a large rectangular head (1" width × 3/4" height) for maximum torque application without tools
• Enhanced corrosion resistance from the black-oxide steel finish, ideal for industrial environments
• Reliable coarse threading (5/16"-18 UNC) ensures quick installation and secure fastening in various materials
• Precision Class 2A thread fit guarantees consistent engagement and reduces cross-threading risks
• Partially threaded 1 1/4" design allows for controlled clamping force and prevents over-tightening
• Right-hand thread direction provides intuitive, standard operation for efficient assembly
• RoHS 3 compliance ensures environmental safety and meets global regulatory standards

Professional Applications & Engineering Value

Engineered for demanding industrial and commercial settings, this black-oxide steel thumb screw delivers exceptional durability and ease of use. The rectangular head offers an ergonomic grip, enabling high-torque manual adjustments in machinery, enclosures, and fixtures where frequent access is required. Its coarse UNC threads provide rapid installation and robust holding power in soft metals or plastics, reducing assembly time. The black-oxide coating resists rust and wear, extending service life in humid or corrosive environments. Ideal for applications like electrical panels, automotive components, and production equipment, this screw combines user convenience with engineering reliability.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional accuracy and interchangeability. It features a 5/16"-18 thread size, 1 1/4" thread length, and 1 1/2" overall length with partial threading. Manufactured from black-oxide steel, it complies with RoHS 3 (2015/863/EU) regulations, ensuring it is free from hazardous substances for safe use in global markets.