S-98164A625 4-40 x 1 1/2" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated surface treatment
- High-strength performance with 70,000 psi tensile strength for reliable load-bearing in demanding applications
- Precise thread engagement ensured by Class 3A thread fit and 4-40 UNC coarse threading for vibration resistance
- Easy installation and removal with hex drive design requiring only 1/16" tooling
- Streamlined profile with rounded button head preventing snagging while maintaining structural integrity
- Full threading coverage across the 1½" length for maximum grip and uniform stress distribution
- Regulatory compliance meeting ASME B18.3 specifications and international RoHS 3/REACH standards
Professional Applications & Engineering Value
Engineered for demanding industrial environments where chemical exposure and moisture are constant concerns, these 316 stainless steel rounded head screws deliver exceptional corrosion resistance through their passivated finish. The combination of 4-40 UNC coarse threading and Class 3A thread fit ensures reliable performance in high-vibration applications while maintaining precise tolerances. The hex drive configuration provides secure tool engagement during installation, preventing stripping and ensuring consistent torque application. These fully threaded screws are particularly valuable in chemical processing equipment, marine hardware, and food-grade machinery where material compatibility and durability are critical engineering considerations.
Specification Summary & Compliance
This rounded head screw features precision 4-40 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASME B18.3 specifications (ASTM F879) with complete RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental responsibility and international regulatory acceptance. The 1½" length provides full threading coverage while maintaining the mechanical properties of 316 stainless steel with 70,000 psi tensile strength.
