S-97972A217 5/16"-18 x 1 1/2" Extreme-Strength Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 180,000 psi ensures reliable performance in high-stress industrial environments, reducing the risk of fastener failure.
• Black-oxide steel construction provides enhanced corrosion resistance and durability, extending service life in demanding conditions.
• UNC coarse threading with Class 2A fit offers quick assembly and secure fastening, minimizing cross-threading and improving installation efficiency.
• Integrated flange design eliminates the need for separate washers, distributing load evenly and speeding up assembly processes.
• Partially threaded shank allows for precise clamping force control, preventing joint loosening under vibration or dynamic loads.
• External hex drive with 3/8" head width enables high-torque application using standard tools, ensuring tight, secure connections.
• Rockwell C38 hardness rating maintains thread integrity and resistance to wear, supporting long-term reliability in repetitive use.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Black-Oxide Steel Hex Head Screws address critical challenges in machinery assembly, construction, and automotive sectors. The UNC coarse thread design facilitates rapid installation in tough materials, while the Class 2A thread fit ensures consistent engagement without binding. The flanged head provides superior bearing surface, reducing surface damage and improving load distribution. With a tensile strength of 180,000 psi and Rockwell C38 hardness, these screws withstand extreme mechanical stress and vibration, making them ideal for equipment requiring reliable, partially threaded fasteners that maintain clamp load over time. The black-oxide finish further enhances corrosion resistance, ensuring performance in humid or outdoor environments.

Specification Summary & Compliance

This 5/16"-18 UNC hex head screw features precise Class 2A thread fit per ASME/ANSI standards, ensuring dimensional accuracy and interchangeability. The coarse thread spacing and right-hand thread direction comply with unified screw thread specifications. Manufactured from high-strength steel with black-oxide surface treatment, it meets industry requirements for durability and performance. The product adheres to relevant industrial manufacturing norms for partially threaded, flanged screws, supporting compliance in mechanical and structural applications where consistent thread engagement and tensile capacity are critical.