S-91512A210 1/4"-20 x 1" 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 construction and passivated finish for extended service life in harsh environments
- Exceptional thread engagement with Class 3A fit and UNC coarse threading ensures reliable fastening in high-vibration applications
- Optimized counterbore seating with 82° countersink angle provides flush mounting and improved load distribution
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding industrial applications
- Secure torque transmission through 5/32" hex drive design preventing cam-out during installation
- Left-hand thread security for specialized applications where reverse rotation prevents loosening under operational forces
- Full regulatory compliance meeting RoHS 3 and REACH standards for global industrial use
Professional Applications & Engineering Value
These left hand thread flat head screws provide critical reverse-threading security in rotating machinery, conveyor systems, and equipment where standard right-hand threads would naturally loosen. The 18-8 stainless steel composition with passivated finish delivers exceptional corrosion resistance in chemical processing, marine, and food industry applications. The UNC coarse threading with Class 3A fit ensures rapid installation and reliable performance in high-vibration environments, while the 82° countersink angle creates seamless flush mounting that eliminates protrusions in precision assemblies. The hex drive configuration provides superior torque transmission compared to standard slotted drives, reducing installation time and preventing tool slippage in confined spaces.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse threading (1/4"-20). Features include full threading, 82° countersink angle, and left-hand thread direction. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for hazardous substance restrictions. Mechanical properties include 70,000 psi tensile strength and Rockwell B70 hardness, ensuring reliable performance in industrial fastening applications.
