S-91035A240 4-40 x 7/8" 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
- Effortless manual installation and removal with a knurled round head and slotted drive for superior grip without tools
- Excellent corrosion resistance provided by 18-8 Stainless Steel material, ideal for harsh industrial environments
- Secure and reliable panel fastening due to the captive panel screw design and Class 2A thread fit for precise engagement
- Quick assembly in coarse-thread applications using the 4-40 UNC right-hand thread for faster driving and reduced cross-threading risk
- Optimized for panel thickness variations with a partially threaded 7/8" length, ensuring consistent clamping force
- Compliance with major industry standards including ASTM A581, RoHS 3, and REACH for guaranteed safety and quality
- Durable, long-lasting performance from a combination of robust material and knurled head texture that resists wear
Professional Applications & Engineering Value
This 18-8 Stainless Steel Thumb Screw is engineered to solve common challenges in industrial panel fastening, such as the need for frequent access and corrosion resistance. The knurled head and slotted drive enable quick, tool-free operation, reducing maintenance time in electronics, machinery, and control panel assemblies. Its 4-40 UNC coarse thread and partially threaded shank ensure secure holding in materials where vibration or thermal expansion occurs, preventing loosening. Made from stainless steel, it withstands moisture and chemicals, making it ideal for outdoor, marine, or chemical processing equipment. The captive panel screw design prevents loss during disassembly, enhancing operational efficiency and reliability in B2B settings.
Specification Summary & Compliance
This thumb screw adheres to Class 2A thread fit for consistent accuracy and features a 4-40 UNC coarse thread with right-hand direction. It meets ASTM A581 specifications for material quality, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.
