S-91035A230 4-40 x 3/4" 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
- Enhanced grip and tool-free operation with knurled round head design for quick manual adjustments in tight spaces
- Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for humid or chemical environments
- Secure and reliable panel retention with partially threaded shank preventing accidental loosening during vibration
- Precision thread engagement ensured by Class 2A thread fit for consistent performance in repetitive assembly
- Broad compatibility with UNC coarse threads matching standard industrial components and panels
- Regulatory peace of mind with compliance to ASTM A581, RoHS 3, and REACH for global supply chain suitability
- Optimized for frequent access panels combining right-hand threading with 0.25" head diameter for ergonomic handling
Professional Applications & Engineering Value
Engineered for captive panel applications in electronics, telecommunications, and industrial machinery, this 4-40 UNC thumb screw solves critical fastening challenges. The 18-8 stainless steel material provides excellent corrosion resistance, eliminating rust in harsh environments while maintaining structural integrity. Its knurled head offers slip-resistant manual operation, reducing installation time and eliminating the need for tools in maintenance-heavy setups. The partially threaded design ensures panels remain securely captured, preventing misalignment and vibration-induced failures. With coarse thread spacing and Class 2A thread fit, it delivers rapid engagement and reliable performance in high-cycle assembly lines, making it an ideal choice for OEMs and MRO specialists seeking durability and compliance.
Specification Summary & Compliance
This captive panel screw maintains Class 2A thread fit per UNC standards with precise 4-40 thread size and coarse thread spacing. Manufacturing adheres to ASTM A581 specifications for material consistency, while full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental and safety standards are met for industrial and electronic applications.
