S-91035A620 1/4"-20 x 7/8" ASTM A581, ASTM A582 Captive Panel Screws

Key Features & Benefits at a Glance

• Enhanced manual grip and torque application with knurled round head design, eliminating the need for tools in frequent adjustments
• Superior corrosion resistance and durability provided by 18-8 Stainless Steel construction, ideal for harsh industrial environments
• Quick and secure fastening with 1/4"-20 UNC coarse threading, ensuring rapid assembly and reduced cross-threading risks
• Optimized panel retention and alignment through the partially threaded design, preventing over-tightening and component damage
• Precise and reliable thread engagement guaranteed by Class 2A thread fit, maintaining consistent performance in repetitive use
• Compliance with rigorous industry standards including ASTM A581, ensuring material quality and mechanical properties
• Environmentally safe manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substances

Professional Applications & Engineering Value

This 18-8 Stainless Steel Thumb Screw is engineered to address common challenges in industrial assembly and maintenance. The knurled head provides exceptional manual grip, allowing for quick tool-less adjustments in tight spaces or on captive panel installations. Its 1/4"-20 UNC coarse thread facilitates faster installation and reduces the risk of stripping in soft materials or misaligned holes. The partially threaded shank design ensures secure panel retention without over-compression, making it ideal for electronic enclosures, machinery access panels, and instrumentation. Constructed from corrosion-resistant stainless steel, it withstands exposure to moisture, chemicals, and temperature variations, delivering long-term reliability in demanding applications such as aerospace, automotive, and telecommunications equipment.

Specification Summary & Compliance

This thumb screw features a 1/4"-20 UNC thread with Class 2A fit for precise dimensional accuracy and consistent thread engagement. It is manufactured in compliance with ASTM A581 specifications for material quality and performance. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from restricted hazardous substances and safe for use in various global markets.