S-91185A463 1/4"-28 x 5/8" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and comfort with a knurled acetal plastic head that provides secure hand-tightening without tools
• Superior corrosion resistance thanks to the 18-8 stainless steel body, ideal for various industrial environments
• Precise and reliable fastening with a Class 3A thread fit and fine UNF thread for tight, vibration-resistant connections
• Low-profile design allows for use in confined spaces where standard thumb screws may not fit
• Wide temperature tolerance from 32° to 180°F, ensuring performance in fluctuating conditions
• Full threading for maximum engagement and holding power along the entire screw length
• Compliance with environmental standards including RoHS 3 and REACH, meeting global regulatory requirements

Professional Applications & Engineering Value

This low-profile thumb screw combines the strength of 18-8 stainless steel with the ergonomic benefits of a knurled acetal plastic head, making it an excellent choice for applications requiring frequent adjustments without tools. The 1/4"-28 UNF fine thread with Class 3A fit ensures precise alignment and resistance to loosening under vibration, common in electronics, machinery, and assembly fixtures. Its fully threaded design provides consistent clamping force, while the acetal head offers a comfortable, non-slip surface that withstands repeated use. Ideal for industrial maintenance, OEM equipment, and enclosures, this screw delivers durability and user-friendly operation in demanding environments.

Specification Summary & Compliance

This thumb screw features a 1/4"-28 UNF fine thread with Class 3A thread fit for high precision and a low-profile round head with 3/4" diameter and 5/8" length. Manufactured from 18-8 stainless steel and acetal plastic, it is fully threaded and right-hand threaded. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.