S-91035A593 10-32 x 1 3/8" ASTM A581, ASTM A582 Captive Panel Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments.
• Superior hand-tightening grip thanks to the knurled round head design, reducing tool dependency and speeding up assembly.
• Precise fine-thread engagement with 10-32 UNF threading and Class 2A fit for reliable, vibration-resistant fastening in panels.
• Optimized partial threading (1/4" thread length on 1 3/8" overall length) ensures secure captive panel retention without over-threading.
• Compliance with rigorous standards including ASTM A581 for material consistency and RoHS 3/REACH for environmental safety.
• Right-hand thread direction for intuitive installation, compatible with standard UNF threaded components.
• Durable and maintenance-free performance due to the stainless steel material and fine thread spacing, reducing wear over time.

Professional Applications & Engineering Value

This 18-8 Stainless Steel Thumb Screw is engineered to address common challenges in panel fastening applications, where frequent access and reliable security are critical. The knurled head texture provides exceptional grip for hand-tightening, eliminating the need for tools in tight spaces and reducing assembly time. Its 10-32 UNF fine threading and Class 2A thread fit deliver precise engagement, minimizing loosening from vibrations in industrial equipment, electronics enclosures, or machinery panels. The partially threaded design ensures that the screw remains captive, preventing accidental dislodgement while allowing for easy panel removal. Made from corrosion-resistant stainless steel, it withstands moisture and chemicals, making it a durable choice for OEM and maintenance use in demanding environments.

Specification Summary & Compliance

This thumb screw adheres to Class 2A thread fit for consistent dimensional accuracy and smooth assembly. It conforms to UNF thread standards with a 10-32 fine thread size and right-hand direction. Manufacturing meets ASTM A581 specifications for material quality, and the product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it is free from hazardous substances and suitable for global industrial applications.