S-90988A012 4-40 x 1/4" FF-S-92, MS51957-13 Stainless Steel Pan Head Phillips Screws
Stainless Steel Pan Head Phillips 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
- Exceptional corrosion resistance with black-oxide coated 18-8 stainless steel construction for long-lasting performance in demanding environments
- High tensile strength of 80,000 psi ensures reliable fastening integrity under substantial mechanical stress
- Full threading with 4-40 UNC coarse spacing provides maximum grip and faster installation in various materials
- Class 2A thread fit guarantees consistent, precise engagement while maintaining easy assembly
- Pan head design with Phillips drive offers superior driving torque control and flush mounting capability
- Comprehensive regulatory compliance including RoHS 3 and REACH ensures environmental and safety standards are met
- Right-hand threading with standard pan profile delivers universal compatibility with existing industrial equipment
Professional Applications & Engineering Value
These black-oxide 18-8 stainless steel screws provide critical corrosion protection where moisture, chemicals, or outdoor exposure would compromise ordinary fasteners. The 4-40 UNC coarse thread configuration prevents cross-threading in soft materials while maintaining strong pull-out resistance. With 80,000 psi tensile strength and fully threaded design, they distribute clamping force evenly across the entire engagement length, eliminating stress concentration points. The rounded pan head creates a low-profile finish that clears obstructions in tight assemblies, while the Phillips drive ensures widespread tool compatibility across maintenance teams. Ideal for electronics enclosures, machinery panels, and instrumentation where corrosion-resistant screws must maintain dimensional stability across thermal cycles.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 4-40 UNC coarse thread specifications. Complies with Fed. Spec. FF-S-92 (MS51957-13) for consistent quality and dimensional accuracy. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. The black-oxide surface treatment on 18-8 stainless steel provides additional corrosion protection while maintaining electrical conductivity where required.
