S-91035A190 4-40 x 3/8" ASTM A581, ASTM A582 Captive Panel Screws
Captive Panel Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Enhanced manual operation with knurled round head design for superior grip and tool-free tightening/loosening
- Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments
- Secure panel retention through partially threaded design that prevents complete screw removal
- Reliable thread engagement with Class 2A UNC coarse threads ensuring consistent fastening performance
- Versatile compatibility with standard 4-40 threaded holes across various panel applications
- Quick installation via slotted drive option for additional tool compatibility when needed
- Regulatory compliance meeting ASTM A581, RoHS 3, and REACH standards for quality assurance
Professional Applications & Engineering Value
This 4-40 UNC thumb screw delivers critical engineering solutions for panel fastening applications where frequent access and reliability are paramount. The 18-8 stainless steel construction provides excellent resistance to corrosion and oxidation, making it suitable for electronics enclosures, industrial control panels, and medical equipment that require repeated maintenance cycles. The knurled head texture offers positive grip even with gloved hands, while the partially threaded design ensures screws remain captive in panels, eliminating lost hardware in field service situations. The coarse thread spacing and Class 2A thread fit provide quick engagement and consistent clamping force, reducing assembly time while maintaining secure connections in vibration-prone environments.
Specification Summary & Compliance
This captive panel screw features precise 4-40 UNC threads with Class 2A tolerance for reliable fit and function. Manufacturing complies with ASTM A581 specifications for quality consistency. The product is fully RoHS 3 (2015/863/EU) compliant and meets REACH (EC 1907/2006) requirements, ensuring environmental responsibility and regulatory adherence for global industrial applications.
