S-95955A223 4-40 x 1/4" Left-Hand-Thread Stainless Steel Button Head Hex-Drive Screws
Left-Hand-Thread 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 thanks to 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
- High-strength performance with 80,000 psi tensile strength and Rockwell B85 hardness, ensuring durability under demanding loads.
- Secure, reverse-threaded fastening with left-hand UNC threads, providing reliable locking in applications where standard rotation causes loosening.
- Easy installation and removal with a 1/16" hex drive, allowing for efficient assembly with standard tools.
- Precise thread fit with Class 2A tolerance, ensuring consistent engagement and reducing the risk of cross-threading.
- Sleek, low-profile design from the rounded button head, minimizing protrusion while maintaining a secure hold.
- Compliance with major regulations including RoHS 3 and REACH, ensuring safety and environmental standards are met.
Professional Applications & Engineering Value
Engineered for precision and reliability, this 4-40 UNC left-hand thread screw with a rounded button head addresses critical assembly challenges in industrial settings. The 18-8 stainless steel material offers excellent corrosion resistance, making it suitable for applications exposed to moisture, chemicals, or outdoor elements, such as machinery, electronic enclosures, and automotive components. Its left-hand thread direction is particularly valuable in systems where rotational forces could loosen standard right-hand threads, providing a secure fastening solution. The hex drive ensures straightforward installation with common tools, reducing assembly time and improving workflow efficiency. Combined with a coarse thread and full threading, it delivers strong holding power and consistent performance in high-vibration environments, enhancing the longevity and safety of your equipment.
Specification Summary & Compliance
This screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional accuracy. It is manufactured in accordance with industry specifications for inch system fasteners and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety requirements.
