S-91746A624 4-40 x 5/16" Thumb Screws
Thumb Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Enhanced grip and torque application with knurled round head design for secure manual operation without tools
- Superior corrosion resistance from 18-8 Stainless Steel construction, ideal for humid or chemically exposed environments
- Reliable mechanical performance with 80,000 psi tensile strength and Rockwell B85 hardness for repeated use
- Quick installation and adjustment through UNC coarse threading and Class 2A fit, ensuring smooth engagement
- Low-profile head design minimizes protrusion in space-constrained assemblies
- Full threading along 5/16" length provides maximum holding power and alignment
- Compliance with environmental standards including RoHS 3 and REACH for safe industrial use
Professional Applications & Engineering Value
This 4-40 low-profile thumb screw addresses critical needs in industrial assembly and maintenance where tool-free access and corrosion resistance are paramount. The knurled round head offers exceptional manual grip, reducing installation time in electronics, machinery panels, and instrumentation. Manufactured from 18-8 Stainless Steel, it withstands oxidation and chemical exposure, ensuring longevity in harsh conditions. The UNC coarse thread with Class 2A fit promotes rapid fastening with minimal cross-threading risk, while the fully threaded design enhances load distribution. Ideal for applications requiring frequent adjustments, such as access panels, clamps, and calibration devices, this screw combines durability with user-friendly operation.
Specification Summary & Compliance
This thumb screw adheres to UNC coarse thread standards with a Class 2A thread fit for precise dimensional accuracy and interchangeability. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. The manufacturing process follows industry specifications for 18-8 Stainless Steel hardness (Rockwell B85) and tensile strength (80,000 psi), guaranteeing consistent performance in professional environments.
