S-94066A855 1/4"-20 x 5/8" 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 with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments
- High mechanical strength with 80,000 psi tensile strength and Rockwell B96 hardness for demanding load-bearing applications
- Precise thread engagement through Class 2A UNC coarse threads, providing secure fastening and vibration resistance
- Tamper-resistant security with drilled spanner drive design, preventing unauthorized access in public or safety-critical installations
- Full threading coverage along the 5/8" length for maximum grip and distribution of clamping force
- Regulatory compliance with RoHS 3 and REACH standards, meeting international environmental and safety requirements
- Rounded pan head profile offering a low-profile, finished appearance while reducing surface snagging
Professional Applications & Engineering Value
Engineered for industrial and mechanical assemblies, these 1/4"-20 UNC rounded head screws combine 18-8 stainless steel durability with a passivated finish to resist oxidation, chemicals, and moisture—ideal for outdoor equipment, marine hardware, and food processing machinery. The drilled spanner drive ensures tamper-resistant fastening in public infrastructure or security panels, while the coarse UNC threads and Class 2A fit enable quick installation and reliable performance under vibration. With full threading and a pan head design, they provide uniform stress distribution and a flush mounting solution for enclosures, frames, and heavy-duty fixtures, reducing maintenance needs and lifecycle costs.
Specification Summary & Compliance
This screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of hazardous substances. Manufacturing conforms to inch-system specifications, including a 1/4"-20 thread size, 5/8" length, and fully threaded design, supporting reliable performance in regulated industries.
