S-91746A118 4-40 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and torque application with knurled round head design for tool-free operation in tight spaces
• Superior corrosion resistance provided by 18-8 stainless steel construction for long-term reliability in harsh environments
• High load-bearing capacity with 80,000 psi tensile strength to withstand demanding mechanical applications
• Consistent threading performance through fully threaded UNC coarse spacing for rapid installation and secure fastening
• Precise thread engagement ensured by Class 2A thread fit for vibration resistance and reduced loosening
• Durable mechanical properties with Rockwell B85 hardness maintaining structural integrity under repeated use
• Environmental compliance assurance meeting RoHS 3 and REACH regulations for safe industrial deployment

Professional Applications & Engineering Value

This 4-40 UNC thumb screw delivers exceptional engineering value through its 18-8 stainless steel composition, offering optimal corrosion resistance for industrial equipment, electronic enclosures, and machinery subjected to moisture or chemical exposure. The knurled round head provides superior manual grip where tool access is limited, while the fully threaded coarse spacing enables quick assembly in production lines. With right-hand threading and Class 2A fit, it maintains secure connections in vibration-prone applications, reducing maintenance frequency. The combination of 80,000 psi tensile strength and Rockwell B85 hardness ensures reliable performance in mechanical assemblies requiring repeated adjustments.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread spacing (4-40 thread size). Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include 1" length, 3/16" head diameter, and fully threaded construction meeting industrial fastening specifications.