S-97760A921 M8 x 25 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-plated finish for extended service life in harsh industrial environments
- Exceptional mechanical strength with Class 8.8 rating and 110,000 PSI tensile strength for reliable performance under high stress
- Optimized left-hand threading provides secure fastening in applications requiring reverse-thread direction for safety and specialized machinery
- Precision metric coarse threading (M8 x 1.25mm) ensures quick assembly and vibration resistance in demanding applications
- Full-length threading offers maximum grip and load distribution across the entire fastener length
- External hex drive design enables high-torque installation with standard tools for efficient maintenance and assembly
- Consistent hardness (Rockwell C21) maintains dimensional stability and prevents deformation during installation
Professional Applications & Engineering Value
This M8 left-hand hex head screw delivers critical engineering solutions where standard right-hand threads would loosen under rotational forces. The Class 8.8 steel construction with zinc-plated finish provides durable corrosion protection for industrial machinery, automotive components, and equipment subjected to counter-clockwise motion. The metric coarse threading (1.25mm pitch) ensures rapid installation while resisting vibration-induced loosening in high-stress assemblies. With fully threaded design and external hex drive, this fastener maximizes clamping force distribution and enables high-torque applications using common wrenching tools, making it ideal for maintenance-critical environments where reliability and standardized tooling are paramount.
Specification Summary & Compliance
Manufactured to precise Class 6h thread fit tolerances with M8 x 1.25mm coarse metric threading. Complies with ASME B18.2.3.1M and ISO 898-1 standards for dimensional accuracy and mechanical properties. Features 25mm length with 13mm hex head configuration. Meets industry requirements for material consistency and performance verification.
