S-91518A140 M4 x 12 mm Left-Hand-Thread Stainless Steel Hex-Drive Flat Head Screws
Left-Hand-Thread Stainless Steel Hex-Drive Flat Head 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 and passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
- Secure left-hand threading prevents loosening in counter-rotational applications, enhancing operational safety
- Precise Class 6g thread fit ensures consistent engagement and vibration resistance in assembled components
- Optimized flat head design with 90° countersink angle for flush mounting and streamlined surface profiles
- Efficient 2.5mm hex drive enables quick installation and high-torque application with standard tools
- Full regulatory compliance with RoHS 3 and REACH standards for global supply chain integration
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this M4 left-hand metric flat head screw addresses critical challenges in machinery requiring reverse-thread security. The 18-8 stainless steel construction combined with a passivated finish provides exceptional resistance to oxidation and chemical exposure, extending service life in humid or corrosive environments. Its coarse thread pitch and Class 6g tolerance ensure rapid assembly and reliable performance in high-vibration settings such as rotating equipment, conveyor systems, and automotive assemblies. The fully threaded design and hex drive facilitate uniform clamping force and tool accessibility, making it an ideal industrial fastener for maintenance-critical operations.
Specification Summary & Compliance
This fastener maintains metric thread specifications with M4 x 0.7mm coarse threading and Class 6g thread fit per ISO standards, ensuring dimensional accuracy. Manufacturing adheres to strict RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, guaranteeing the absence of restricted hazardous substances. The left-hand thread direction and 90° countersink angle are precision-machined for consistent performance in specialized assembly requirements.
