S-97760A919 M8 x 20 mm ASME B18.2.3.1M, ISO 898-1 Left-Hand Threaded Medium-Strength Metric Class 8.8 Steel Hex Head Screws
Left-Hand Threaded Medium-Strength Metric Class 8.8 Steel Hex 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 zinc plating that protects against rust and extends service life in harsh industrial environments
- High tensile strength of 110,000 psi ensures reliable load-bearing capacity and structural integrity for demanding applications
- Class 8.8 strength grade provides consistent performance and durability in high-stress mechanical assemblies
- Left-hand thread direction offers specialized functionality for applications requiring reverse-threading security and safety
- Fully threaded coarse pitch design enables faster installation and superior grip in various materials
- External hex drive with 13mm head allows for easy installation and removal with standard tools, reducing assembly time
- Precision Rockwell C21 hardness maintains thread integrity and prevents stripping during repeated use
Professional Applications & Engineering Value
This M8 left-hand hex head screw delivers exceptional engineering value in applications where reverse-threading prevents loosening from rotational forces. The Class 8.8 steel construction with zinc plating combats corrosion in industrial settings, while the coarse 1.25mm pitch and fully threaded design provide maximum holding power in machinery, automotive components, and vibration-prone equipment. Its external hex drive ensures straightforward installation with common tools, reducing labor costs and maintenance downtime. Engineered to meet rigorous standards, this fastener solves critical challenges in mechanical assemblies requiring left-hand thread security and high tensile strength performance.
Specification Summary & Compliance
This M8 x 1.25mm screw features Class 6h thread fit precision and 20mm length with full threading. Manufactured to comply with ASME B18.2.3.1M and ISO 898-1 standards, ensuring dimensional accuracy and mechanical properties. The Class 8.8 strength rating and Rockwell C21 hardness confirm consistent quality for industrial use, meeting international specifications for reliable performance.
