S-95955A232 4-40 x 3/4" 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
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments.
- High tensile strength of 80,000 psi ensures reliable performance under heavy loads and vibration.
- Left-hand thread design provides secure fastening in applications where standard right-hand threads may loosen.
- Hex 1/16" drive allows for maximum torque application and easy installation with standard tools.
- Class 2A thread fit guarantees consistent, precise engagement and reduces cross-threading risks.
- Fully threaded 3/4" length offers versatile gripping power across the entire shank.
- Compliance with RoHS 3 and REACH ensures environmental safety and meets international regulatory standards.
Professional Applications & Engineering Value
This 4-40 UNC left-hand thread rounded button head screw is engineered from 18-8 stainless steel to address critical industrial challenges, such as corrosion in moist or chemical-exposed settings. The coarse UNC thread and left-hand direction are specifically designed for applications where reverse rotation is a concern, preventing unintended loosening in machinery, automotive assemblies, and specialized equipment. The rounded button head with a hex drive provides a low-profile, aesthetically clean finish while enabling high-torque installation without slippage. With a Rockwell B85 hardness and full threading, it ensures durable, long-term fastening in demanding environments, reducing maintenance needs and enhancing operational reliability.
Specification Summary & Compliance
This screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured in the inch system with a length of 3/4", head diameter of 0.213", and drive size of 1/16". Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it meets stringent environmental and safety regulations for industrial use.
