S-91035A730 1/4"-28 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
- Superior manual operation with knurled round head for secure, slip-resistant grip without tools
- Excellent corrosion resistance from 18-8 Stainless Steel construction for long-term reliability in harsh environments
- Precise thread engagement with 1/4"-28 UNF fine threading and Class 2A fit for secure, vibration-resistant fastening
- Optimized panel retention through partially threaded design that prevents over-insertion in captive applications
- Dual drive compatibility featuring both thumb operation and slotted drive for installation flexibility
- Regulatory compliance assurance meeting ASTM A581, RoHS 3, and REACH standards for quality and environmental safety
- Consistent dimensional accuracy with 1/2" head diameter and 3/4" length for reliable fit in panel assemblies
Professional Applications & Engineering Value
This 18-8 Stainless Steel thumb screw delivers exceptional value in captive panel applications where frequent access and reliable fastening are critical. The knurled head texture provides positive grip even with gloved hands, while the partially threaded shank ensures proper seating depth in panel mounting holes. The 1/4"-28 UNF fine threading offers superior holding power against vibration in electronic enclosures, industrial control panels, and machinery access points. Manufactured to ASTM A581 specifications, this fastener maintains consistent performance in demanding environments where corrosion resistance and mechanical reliability are essential for operational continuity.
Specification Summary & Compliance
This captive panel screw features Class 2A thread fit per UNF standards with right-hand fine threading (1/4"-28). The partially threaded design provides controlled engagement depth. Manufacturing complies with ASTM A581 specifications for quality assurance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial use.
