S-91035A610 1/4"-20 x 5/8" ASTM A581, ASTM A582 Captive Panel Screws

Key Features & Benefits at a Glance

• Enhanced Grip and Tool-Free Operation: Knurled thumb head design allows for secure hand-tightening and removal without tools, speeding up panel maintenance and assembly.
• Superior Corrosion Resistance: Made from 18-8 Stainless Steel, offering excellent durability and resistance to rust in harsh industrial environments.
• Secure and Reliable Fastening: 1/4"-20 UNC coarse threading with a Class 2A thread fit ensures easy engagement and a strong, vibration-resistant hold.
• Optimized for Panel Retention: Partially threaded shank design prevents over-insertion and keeps the screw captive, ideal for repeated panel access.
• Broad Regulatory Compliance: Meets ASTM A581 specifications for material quality, and is RoHS 3 and REACH compliant for safe use in regulated industries.
• Versatile Drive Option: Includes a slotted drive for additional tool compatibility, providing flexibility in installation methods.
• Right-hand thread direction for standard, intuitive installation in most panel fastening applications.

Professional Applications & Engineering Value

This knurled thumb captive panel screw is engineered to solve common challenges in industrial assembly and maintenance, such as the need for quick, tool-free access to electronic enclosures, machinery panels, and communication devices. The 18-8 stainless steel construction ensures long-term reliability, resisting corrosion from moisture, chemicals, and outdoor exposure. The coarse UNC thread and partial threading design allow for rapid installation and secure retention, minimizing the risk of cross-threading and panel damage. By combining a user-friendly thumb head with robust material properties, this screw reduces assembly time and maintenance costs, making it an ideal choice for panel fasteners in telecommunications, automotive, and heavy equipment industries where frequent access is required.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread with Class 2A fit for precise dimensional accuracy and reliable engagement. It is manufactured in compliance with ASTM A581 standards for material consistency and performance. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for hazardous substances.