S-90585A209 4-40 x 1 1/4" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws
Stainless Steel Hex Drive Flat Head 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 from 316 stainless steel and passivated finish, ideal for harsh environments like marine or chemical processing.
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness, ensuring reliable load-bearing and durability.
- Precise, secure fastening due to Class 3A thread fit and UNC coarse threading, minimizing the risk of loosening under vibration.
- Efficient installation and flush finish with a standard 82° countersink angle and hex drive, allowing for easy, low-profile assembly.
- Full threading for maximum grip along the entire 1-1/4" length, providing consistent holding power in various material thicknesses.
- Compliance with industry standards including ASME B18.3, ensuring dimensional accuracy and interchangeability.
- Environmental and safety adherence with RoHS 3 and REACH compliance, making them suitable for regulated industries.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these 4-40 UNC flat head screws in 316 stainless steel address critical challenges like corrosion and mechanical stress. The passivated finish enhances longevity in aggressive environments, such as offshore equipment or food processing machinery, where moisture and chemicals are prevalent. With a Class 3A thread fit and coarse UNC threading, they deliver vibration-resistant fastening, reducing maintenance in assemblies like enclosures or automotive components. The hex drive and 82° countersink enable quick, flush installations, streamlining production while meeting strict ASME B18.3 specifications for reliability.
Specification Summary & Compliance
This product adheres to precise dimensional tolerances, including a Class 3A thread fit for superior accuracy and a head diameter tolerance of -0.037" to 0". It conforms to ASME B18.3 manufacturing standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
