S-98164A624 4-40 x 1 1/4" ASME B18.3, ASTM F879 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
- Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
- High tensile strength of 70,000 psi ensures reliable, durable fastening under demanding mechanical loads
- Precision Class 3A thread fit provides consistent, secure engagement and reduces cross-threading risks
- Passivated finish enhances surface durability and extends service life in corrosive conditions
- Hex drive design with 1/16" drive size allows for easy installation and high-torque application without slippage
- Fully threaded UNC coarse thread enables faster assembly and improved grip in various materials
- Rounded button head profile offers a low-profile, aesthetically clean finish while minimizing snagging
Professional Applications & Engineering Value
This 4-40 UNC rounded head screw in 316 stainless steel addresses critical challenges in industrial settings where corrosion and mechanical stress are prevalent. The passivated finish significantly boosts resistance to chemicals, salts, and moisture, making it suitable for marine equipment, chemical processing plants, and food-grade machinery. Its coarse UNC threading and Class 3A thread fit ensure rapid, precise installation, reducing assembly time and enhancing joint integrity. The hex drive facilitates secure tool engagement, preventing stripping during high-torque applications. Engineered for demanding environments, this screw provides long-term reliability, minimizing maintenance and replacement costs in industrial fastening systems.
Specification Summary & Compliance
This screw adheres to ASME B18.3 specifications with a Class 3A thread fit for precise dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and regulatory adherence. Thread details include UNC coarse threading, right-hand direction, and a 1-1/4" length with full threading for consistent performance.
