S-91185A491 5/16"-18 x 3/4" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and comfort with knurled acetal plastic head for secure manual tightening without tools
• Superior corrosion resistance from 18-8 stainless steel construction, ideal for humid or demanding environments
• Precise thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance
• Quick installation and adjustment due to coarse UNC threading and fully threaded design
• Durable low-profile head providing smooth surface contact while maintaining easy access
• Broad temperature compatibility with acetal head functioning from 32° to 180°F
• Environmental compliance meeting RoHS 3 and REACH standards for safe industrial use

Professional Applications & Engineering Value

This 5/16"-18 UNC thumb screw combines the strength of 18-8 stainless steel with the ergonomic advantages of a knurled acetal plastic head, addressing common assembly challenges in industrial settings. The Class 3A thread fit and coarse thread spacing enable rapid installation and removal, reducing maintenance downtime in equipment panels, electronic enclosures, and machinery guards. The fully threaded design ensures consistent clamping force across the entire 3/4" length, while the low-profile round head minimizes snagging in confined spaces. Ideal for applications requiring frequent access, such as calibration covers or service doors, this thumb screw delivers reliable performance without compromising on corrosion resistance or regulatory compliance.

Specification Summary & Compliance

Manufactured to precise UNC thread standards with Class 3A thread fit for superior dimensional accuracy. The screw features a 1" diameter knurled acetal head with 13/32" height and right-hand thread direction. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety in industrial components.