S-91035A790 1/4"-28 x 1 1/4" ASTM A581, ASTM A582 Captive Panel Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments
• Enhanced manual grip and torque application thanks to the knurled round head design
• Secure and precise thread engagement with Class 2A fit and 1/4"-28 UNF fine threading
• Versatile installation in panels and assemblies due to the partially threaded captive panel design
• Reliable performance under demanding conditions as it meets ASTM A581 material specifications
• Safe for global use with full compliance to RoHS 3 and REACH environmental regulations
• Convenient tool-free operation featuring a slotted drive for additional adjustment options

Professional Applications & Engineering Value

This 18-8 Stainless Steel Thumb Screw is engineered to address common challenges in industrial assembly and maintenance. The knurled round head provides excellent manual grip, reducing slippage and enabling quick, tool-free adjustments in tight spaces. Made from corrosion-resistant 18-8 stainless steel, it withstands exposure to moisture, chemicals, and varying temperatures, extending service life in captive panel applications such as electronic enclosures, machinery guards, and access panels. The 1/4"-28 UNF fine thread and Class 2A fit ensure secure, vibration-resistant fastening, while partial threading allows for precise depth control, preventing over-tightening and damage to sensitive components.

Specification Summary & Compliance

This thumb screw features a 1/4"-28 UNF fine thread with Class 2A thread fit for consistent dimensional accuracy. It is manufactured in compliance with ASTM A581 specifications for material quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets international environmental and safety standards for industrial use.