S-91882A221 4-40 x 7/16" 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
- Superior corrosion resistance with black-oxide steel finish, ideal for harsh industrial environments
- Exceptional grip and torque application thanks to the knurled round head design for tool-free operation
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
- Precise Class 2A thread fit provides smooth installation and secure fastening in UNC threaded holes
- Fully threaded coarse spacing enables quick assembly and strong holding power in various materials
- Durable Rockwell B84 hardness maintains thread integrity and resists wear over repeated use
- Compliance with RoHS 3 and REACH regulations guarantees safe, environmentally responsible sourcing for global supply chains
Professional Applications & Engineering Value
This 4-40 UNC thumb screw delivers critical advantages in assembly and maintenance workflows where speed and reliability are paramount. The black-oxide steel construction resists rust and reduces galling, extending service life in moisture-prone settings like electronic enclosures, machinery panels, and outdoor equipment. Its knurled round head offers excellent manual grip, eliminating the need for tools in tight spaces or during frequent adjustments. With coarse thread spacing and full threading, it ensures rapid engagement and robust clamping force, reducing installation time while preventing loosening under dynamic loads. Engineers value its 70,000 psi tensile strength for securing components in automotive, aerospace, and industrial controls, where vibration resistance and repeatable fastening are essential.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy and interchangeability. It meets RoHS 3 (2015/863/EU) compliance under exemption 6(a)-I for lead as an alloying element in steel and is REACH (EC 1907/2006) compliant, ensuring adherence to international environmental and safety regulations for industrial components.
