S-90910A123 4-40 x 1/4" ASME B18.3, ASTM F835 Steel Button Head Torx Plus Screws
Steel Button Head Torx Plus 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 with zinc plating that protects against rust in harsh industrial environments
- Enhanced torque transmission and reduced cam-out thanks to the Torx Plus IP8 drive for secure, efficient installation
- Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for reliable performance under high stress
- Precise thread engagement with Class 3A fit and coarse UNC threading, ensuring vibration resistance and secure fastening
- Full threading design provides consistent holding power along the entire 1/4" length for versatile applications
- Compliance with industry standards including ASME B18.3, ensuring consistent quality and interchangeability
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for safe use in regulated industries
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated alloy steel rounded head screws deliver critical reliability in demanding industrial settings. The Torx Plus IP8 drive minimizes tool slippage and damage during high-torque assembly, reducing downtime in production lines. With a Class 3A thread fit and coarse thread spacing, these fasteners maintain secure connections in vibrating machinery while the fully threaded design ensures maximum grip in thin materials. The zinc-plated alloy steel construction provides excellent corrosion protection for outdoor equipment, automotive components, and electronic enclosures where 120,000 psi tensile strength prevents failure under mechanical stress. The rounded button head profile offers a low-profile finish that reduces snagging while meeting strict ASME B18.3 specifications for dimensional consistency.
Specification Summary & Compliance
This fastener features precise Class 3A thread fit with 4-40 UNC coarse threads in right-hand direction, manufactured to ASME B18.3 standards where applicable. The inch system measurements ensure 0.213" head diameter and 1/4" length with full threading. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety for industrial applications worldwide.
