S-98164A430 4-40 x 5/16" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive 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 in harsh environments due to 316 Stainless Steel construction and passivated finish
- Superior mechanical reliability with a high 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Precise, secure fastening ensured by Class 3A thread fit and UNC coarse thread spacing for reduced cross-threading
- Efficient installation and removal with a 1/16" hex drive and rounded button head design
- Full thread engagement along the 5/16" length for maximum grip and load distribution
- Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and safety
- Versatile industrial use as a robust alternative to metric screws in heavy-duty assemblies
Professional Applications & Engineering Value
These 4-40 UNC thread rounded head screws are engineered from 316 Stainless Steel to solve critical challenges in corrosive or high-stress environments. The passivated finish enhances surface durability, preventing rust and chemical degradation in marine, chemical processing, and outdoor applications. With a Class 3A thread fit and coarse thread spacing, they provide reliable, vibration-resistant connections that minimize loosening. The hex drive and rounded button head facilitate quick assembly in tight spaces, reducing installation time while maintaining a low-profile appearance. Ideal for machinery, electronics, and structural assemblies, these screws deliver long-term performance where corrosion resistance and mechanical integrity are non-negotiable.
Specification Summary & Compliance
This product adheres to precise dimensional standards, including Class 3A thread fit per UNC specifications and ASME B18.3 manufacturing guidelines. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met. The screw features a coarse thread spacing and is fully threaded for consistent performance across its 5/16" length.
