S-90211A512 7/16"-14 x 1 1/2" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with Grade 8 classification and 150,000 psi tensile strength for critical structural applications
• Enhanced corrosion resistance through zinc yellow-chromate plating that withstands harsh industrial environments
• Precise thread engagement with Class 3A thread fit ensuring reliable fastening in high-vibration settings
• Superior hardness performance at Rockwell C33 rating for exceptional wear resistance and durability
• Left-hand threading design providing secure fastening in applications where right-hand threads would loosen
• Full-threaded construction offering maximum grip length and uniform stress distribution
• Heavy-duty external hex drive enabling high-torque installation with standard tools

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The left-hand UNC coarse threading provides critical anti-loosening properties in rotating machinery, conveyor systems, and power transmission equipment where reverse rotation occurs. The zinc yellow-chromate plating creates a robust barrier against corrosion in manufacturing facilities, outdoor equipment, and marine applications. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners maintain integrity under extreme mechanical stress, vibration, and shock loads. The fully threaded 1-1/2" steel construction ensures maximum engagement in thick materials, while the external hex drive accommodates high installation torque without stripping. These SAE J429 compliant screws solve critical fastening challenges in heavy machinery, structural steel connections, and industrial equipment maintenance.

Specification Summary & Compliance

This 7/16"-14 UNC hex head screw features precision Class 3A thread fit tolerances for superior engagement and meets SAE J429 specifications for Grade 8 mechanical properties. The fastener maintains dimensional accuracy with coarse threading (14 TPI) and left-hand thread direction. Manufacturing complies with industry standards for inch fasteners, while the zinc yellow-chromate plating provides RoHS and REACH compliant corrosion protection. The fully threaded design and external hex drive configuration ensure consistent performance across industrial applications requiring reliable, high-strength fastening solutions.