S-91035A390 8-32 x 1/2" 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 manual grip with precision knurled head texture for quick, tool-free installation and removal in tight spaces
- Superior corrosion resistance from 18-8 stainless steel construction, ensuring longevity in humid or chemically exposed industrial environments
- Secure panel retention with partially threaded design that prevents over-tightening and maintains consistent clamping force
- Reliable thread engagement through UNC coarse threading and Class 2A fit, reducing cross-threading risks during assembly
- Broad regulatory compliance meeting ASTM A581 material standards, RoHS 3, and REACH for global supply chain integration
- Dual drive flexibility combining thumb operation with slotted drive compatibility for versatile installation methods
- Optimized head geometry with 0.313" diameter round head providing ample surface area for comfortable manual torque application
Professional Applications & Engineering Value
This 8-32 UNC thumb screw delivers critical performance advantages in industrial panel assembly where frequent access and corrosion resistance are paramount. The 18-8 stainless steel composition withstands oxidation in manufacturing environments, while the knurled head ensures positive grip even with gloved hands. Engineers specify these captive panel screws for electronic enclosures, machinery guards, and communication equipment where the partially threaded design prevents complete disengagement, eliminating lost hardware. The right-hand thread with coarse spacing enables rapid installation without sacrificing the vibration resistance needed in high-cycle applications.
Specification Summary & Compliance
Manufactured to Class 2A thread fit tolerances with UNC 8-32 threading and 1/2" length. Complies with ASTM A581 material specifications for consistent mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions. Features 0.313" knurled round head with slotted drive and 7/32" threaded portion.
