S-91035A770 1/4"-28 x 1" ASTM A581, ASTM A582 Captive Panel Screws

Key Features & Benefits at a Glance

• Enhanced manual operation with knurled round head for superior grip without tools
• Reliable corrosion resistance from 18-8 stainless steel construction in harsh environments
• Secure panel fastening through partially threaded design preventing over-insertion
• Precise thread engagement with Class 2A fit and UNF fine threads for vibration resistance
• Dual drive compatibility featuring both thumb-operated knurl and slotted drive options
• Regulatory compliance assurance meeting ASTM A581, RoHS 3, and REACH standards
• Optimized installation speed with right-hand threading for standard assembly workflows

Professional Applications & Engineering Value

This 18-8 stainless steel thumb screw delivers critical performance where frequent access and corrosion resistance are paramount. The knurled head provides positive grip for manual operation in tight spaces, eliminating tool dependency during panel maintenance. Its partially threaded captive panel screw design prevents cross-threading while ensuring consistent clamping force. The UNF fine thread spacing maintains superior vibration resistance in industrial equipment, electronic enclosures, and machinery panels. Manufactured to ASTM A581 specifications, these screws withstand repeated cycling without galling, making them ideal for applications requiring regular disassembly.

Specification Summary & Compliance

Precision-machined with Class 2A thread fit and 1/4"-28 UNF fine threads ensuring consistent engagement. Manufacturing complies with ASTM A581 material specifications for 18-8 stainless steel. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Thread direction: right hand, threading: partially threaded, drive style: slotted with knurled thumb head.