S-90181A552 1/4"-20 x 2 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Easy manual operation with spade head design for superior grip without tools
• High durability from steel construction with Rockwell B55 hardness rating
• Reliable load-bearing capacity with 40,000 psi tensile strength for demanding applications
• Quick installation through fully threaded coarse UNC spacing
• Precise thread engagement with Class 2A fit ensuring consistent performance
• Versatile compatibility with standard 1/4"-20 UNC components and right-hand thread systems
• Secure fastening across the full 2 1/2" length for maximum holding power

Professional Applications & Engineering Value

This 1/4-20 UNC thumb screw delivers exceptional performance in industrial settings where frequent adjustments and reliable fastening are critical. The steel construction combined with Rockwell B55 hardness ensures resistance to wear and deformation under repeated use. The spade head design provides excellent torque application without specialized tools, making it ideal for machinery access panels, electronic enclosures, and production jigs. The fully threaded coarse spacing enables rapid installation and removal while maintaining 40,000 psi tensile strength for vibration-resistant connections. These features make it particularly valuable in maintenance-heavy environments where downtime reduction is essential.

Specification Summary & Compliance

Manufactured to inch system standards with precise 1/4"-20 UNC coarse thread and Class 2A thread fit for consistent dimensional accuracy. The screw features right-hand thread direction and full threading along the 2 1/2" length. Complies with standard industrial manufacturing specifications for steel thumb screws and meets general industry requirements for mechanical fasteners.