S-90200A220 5/16"-18 x 3/4" Thumb Screws
Thumb Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Enhanced manual grip and control with 3/4" diameter knurled head for slip-resistant operation without tools
- Superior corrosion resistance through black-oxide steel construction for extended service life in industrial environments
- Reliable fastening performance with 70,000 psi tensile strength and Rockwell B84 hardness for demanding applications
- Quick installation and adjustment via fully threaded 5/16"-18 UNC coarse thread design with Class 2A fit
- Optimized ergonomic handling through high-profile round head shape and right-hand thread direction
- Compliance with environmental regulations meeting RoHS 3 and REACH standards for global manufacturing requirements
- Durable thread engagement with coarse thread spacing maintaining secure connections under vibration
Professional Applications & Engineering Value
This black-oxide steel thumb screw delivers exceptional value in applications requiring frequent manual adjustments and reliable fastening. The knurled head texture provides positive grip even with gloved hands, eliminating the need for tools in maintenance panels, access covers, and machinery guards. The high-profile round head design distributes torque evenly while the UNC coarse threads ensure rapid installation in various materials. With 70,000 psi tensile strength, this fastener maintains integrity in vibration-prone environments common in industrial equipment, electronic enclosures, and assembly fixtures. The black-oxide finish resists corrosion in moderate environments, extending service life while the fully threaded shank provides maximum engagement depth for secure connections.
Specification Summary & Compliance
This thumb screw features precision 5/16"-18 UNC threads with Class 2A thread fit ensuring consistent engagement and interchangeability. Manufacturing complies with RoHS 3 (2015/863/EU) with exemption 6(a)-I for lead as an alloying element in steel and REACH (EC 1907/2006) compliance. The coarse thread spacing and right-hand thread direction follow industry standards while the 0.313" thread diameter and 3/4" length provide dimensional accuracy for reliable performance across applications.
