S-90181A587 5/16"-18 x 1 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual operation with spade head design providing superior grip for tool-free tightening and loosening
• Exceptional durability from steel construction with Rockwell B55 hardness resisting wear in demanding environments
• High load-bearing capacity with 40,000 psi tensile strength ensuring reliable performance under stress
• Quick installation through coarse UNC threads and Class 2A fit enabling rapid assembly with standard mating components
• Full-thread engagement along the 1-1/2" length offering consistent clamping force across the entire fastener
• Environmental compliance meeting RoHS 3 standards for safe use in regulated industrial applications
• Optimized ergonomics with 7/8" head width and 11/16" height balancing torque application and user comfort

Professional Applications & Engineering Value

This 5/16"-18 UNC thumb screw delivers critical advantages in industrial settings where frequent adjustments and secure fastening are paramount. The steel construction combined with Rockwell B55 hardness ensures resistance to deformation and wear, making it ideal for machinery access panels, electronic enclosures, and jig fixtures requiring repeated manual operation. The coarse thread design prevents cross-threading while the fully threaded shank maintains consistent pressure distribution. Its spade head eliminates tool dependency, reducing maintenance downtime in production environments where quick disassembly is essential for operational efficiency and equipment servicing.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC coarse threads (5/16"-18) and right-hand threading direction. Complies with RoHS 3 (2015/863/EU) environmental regulations. Dimensions include 1-1/2" length, 0.313" thread diameter, 7/8" head width, and 11/16" head height. Fully threaded design ensures complete engagement with mating components.