S-90211A256 5/16"-18 x 1 1/2" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws
Left-Hand Threaded High-Strength 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
- Maximum Load-Bearing Capacity: Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress environments.
- Superior Corrosion Resistance: Zinc yellow-chromate plating provides enhanced protection against rust and environmental degradation.
- Precise Thread Engagement: Class 3A fit and UNC coarse threads offer secure, vibration-resistant fastening in demanding applications.
- High Durability: Rockwell C33 hardness and SAE J429 compliance guarantee consistent mechanical properties and long service life.
- Left-Hand Thread Security: Designed for applications where standard right-hand threads may loosen under rotational forces.
- Full Threading for Maximum Grip: Ensures uniform stress distribution and stronger holding power across the entire fastener length.
- Easy Installation & Removal: External hex drive and 1/2" head width allow for straightforward tool engagement with common wrenches.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws address critical challenges in machinery assembly, construction, and automotive systems where reverse rotation or high vibration is present. The left-hand UNC coarse threading with Class 3A fit prevents unintentional loosening in rotating equipment, while the zinc yellow-chromate plating extends service life in corrosive environments. With 150,000 psi tensile strength and full threading, they maintain clamp force under extreme loads, making them ideal for structural connections, equipment mounts, and other high-stress industrial fastening scenarios requiring SAE J429 compliance.
Specification Summary & Compliance
This fastener meets SAE J429 specifications for Grade 8 high-strength bolts. Thread system conforms to 5/16"-18 UNC coarse thread standards with Class 3A fit for precise tolerance. Manufacturing follows inch system measurements with fully threaded design and left-hand thread direction. The zinc yellow-chromate plating provides RoHS and REACH compliant corrosion protection while maintaining Rockwell C33 hardness and mechanical properties per applicable industrial standards.
