S-91185A289 8-32 x 3/8" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced Grip and Comfort: Knurled Acetal Plastic head provides superior manual handling without tools, reducing hand fatigue during frequent adjustments.
• Reliable Corrosion Resistance: 18-8 Stainless Steel construction ensures long-term durability in humid or mildly corrosive industrial environments.
• Precision Thread Fit: Class 3A UNC coarse threads deliver secure, vibration-resistant fastening with minimal risk of cross-threading.
• Wide Operational Temperature Range: Head functions reliably from 32° to 180° F, suitable for various indoor and controlled climate applications.
• Low-Profile Design: Round low-profile head minimizes protrusion in compact assemblies while maintaining easy access.
• Full Thread Engagement: Fully threaded shank maximizes holding strength and allows for adjustable positioning along the entire length.
• Regulatory Compliance: Meets RoHS 3 and REACH environmental standards, ensuring safe use in regulated industries.

Professional Applications & Engineering Value

Engineered for tool-free assembly and disassembly, this 8-32 UNC thumb screw combines the corrosion resistance of 18-8 Stainless Steel with the ergonomic benefits of an Acetal Plastic knurled head. The Class 3A thread fit and coarse UNC threading provide rapid installation with high resistance to loosening under vibration, making it ideal for access panels, electronic enclosures, and machinery guards requiring frequent maintenance. The plastic head acts as an electrical insulator and prevents marring of sensitive surfaces, while the low-profile round head design ensures compatibility with space-constrained applications. Fully threaded for maximum adjustability, this screw solves common pain points in prototyping, OEM equipment, and field service where speed, reliability, and compliance with RoHS and REACH standards are critical.

Specification Summary & Compliance

This thumb screw adheres to UNC coarse thread standards with a Class 3A thread fit for precise, high-quality engagement. Dimensions include a #8-32 thread size, 3/8" length, and 1/2" head diameter. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring the absence of restricted hazardous substances. The product is fully threaded and right-hand threaded for standard industrial use.