S-91035A250 4-40 x 1" ASTM A581, ASTM A582 Captive Panel Screws
Captive Panel Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
- Effortless manual operation thanks to the knurled round head design providing excellent grip without tools
- Reliable thread engagement with Class 2A fit UNC coarse threads ensuring consistent fastening performance
- Secure panel retention through partially threaded captive design preventing accidental loosening
- Enhanced assembly efficiency with slotted drive compatibility for both manual and tool-assisted installation
- Long-term durability meeting ASTM A581 standards for consistent mechanical properties
- Environmental compliance with RoHS 3 and REACH regulations for global market acceptance
Professional Applications & Engineering Value
This 4-40 UNC thumb screw delivers exceptional value in panel fastening applications where frequent access and reliability are critical. The 18-8 stainless steel construction provides excellent corrosion resistance, making it suitable for electronics enclosures, industrial control panels, and medical equipment. The knurled head texture ensures secure grip even with gloved hands, while the coarse UNC threading enables quick installation and removal. As a captive panel screw, it prevents loss during maintenance cycles, reducing downtime in assembly operations. The partially threaded design maintains precise panel alignment while the slotted drive offers installation flexibility for various production environments.
Specification Summary & Compliance
This captive panel screw features precise Class 2A thread fit with 4-40 UNC coarse threading and 1" overall length. Manufactured to ASTM A581 specifications for consistent quality and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in restricted substance-sensitive applications. The right-hand thread direction and partial threading provide optimal panel retention while maintaining industry-standard compatibility.
