S-94066A847 4-40 x 1/4" Tamper-Resistant Drilled Spanner Stainless Steel Pan Head Screws
Tamper-Resistant Drilled Spanner Stainless Steel Pan Head 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
- Superior corrosion resistance from 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
- High tensile strength of 80,000 psi provides secure, vibration-resistant fastening for demanding industrial applications.
- Drilled spanner drive with No. 4 size allows for easy installation and removal, reducing assembly time and tool slippage.
- Class 2A thread fit ensures consistent, precise engagement with mating components, minimizing cross-threading risks.
- Fully threaded 4-40 UNC coarse thread design delivers rapid installation and strong holding power in various materials.
- RoHS 3 and REACH compliance guarantees environmental safety and regulatory adherence for global supply chains.
- Rockwell B96 hardness maintains thread integrity and durability under repeated use and high-stress conditions.
Professional Applications & Engineering Value
Engineered for precision and endurance, these 4-40 UNC rounded head screws address common industrial challenges like corrosion-induced failure and assembly inefficiency. The 18-8 stainless steel material, combined with a passivated finish, resists oxidation and chemical exposure, making them ideal for electronics, machinery, and outdoor equipment. The pan head with drilled spanner drive offers a low-profile, tamper-resistant solution that secures components without protruding, while the coarse threads ensure quick fastening in plastics and soft metals. With a right-hand thread direction and full threading, they provide consistent clamping force, reducing the need for frequent maintenance in industrial fastening systems.
Specification Summary & Compliance
This screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental and safety regulations are upheld. Specifications include a 1/4" length, fully threaded design, and manufacturing consistency for reliable performance in technical applications.
