S-91773A115 4-40 x 1" ASME B18.6.3 Stainless Steel Round Head Phillips Screws
Stainless Steel Round 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
- Superior corrosion resistance thanks to 18-8 Stainless Steel construction and passivated finish, ensuring long-term reliability in harsh environments.
- Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable performance under high stress.
- Precise and secure fastening achieved through Class 2A thread fit and UNC coarse threading, reducing cross-threading risks.
- Optimized drive engagement with No. 1 Phillips drive and rounded head design for efficient installation and reduced cam-out.
- Full thread coverage across the 1" length provides maximum grip and load distribution in assemblies.
- Industry-standard compliance with ASME B18.6.3 ensures dimensional accuracy and interchangeability.
- Environmentally responsible manufacturing meeting RoHS 3 and REACH standards for safe use in regulated industries.
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 4-40 UNC rounded head Phillips screws deliver critical performance advantages. The 18-8 Stainless Steel material combined with passivated finish provides exceptional resistance to oxidation and chemical exposure, making them ideal for electronics, machinery, and outdoor equipment where moisture is present. The coarse UNC threading and Class 2A fit ensure rapid installation with reduced galling, while the rounded head profile and No. 1 Phillips drive offer superior torque transmission without damaging adjacent surfaces. With full threading along the entire 1" length, these screws maintain consistent clamping force in vibration-prone applications, preventing loosening and maintaining assembly integrity.
Specification Summary & Compliance
This rounded head screw features precise Class 2A thread fit with 4-40 UNC coarse threads and right-hand direction. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring safe use across various industrial sectors.
