S-91268A420 3/8"-16 x 1 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 150,000 PSI tensile strength for high-stress industrial applications
• Superior wear resistance due to Rockwell C33 hardness, extending service life in demanding environments
• Reliable coarse UNC threading ensures quick assembly and secure fastening in various materials
• Precision Class 2A thread fit guarantees consistent engagement and vibration resistance
• Full-length threading provides maximum grip length and installation flexibility
• External hex drive design enables high-torque installation with standard tools
• Heavy-duty Grade 8 classification delivers proven performance in critical mechanical assemblies

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance where structural integrity is paramount. The steel construction combined with 150,000 PSI tensile strength provides exceptional resistance to shear and tensile forces in heavy machinery, construction equipment, and automotive assemblies. The 3/8"-16 UNC coarse thread configuration ensures rapid installation while maintaining secure connections in both soft and hard materials. With full threading along the 1-3/4" length, these fasteners offer versatile clamping capability across varying material thicknesses. The external hex drive accommodates high torque applications, making them ideal for maintenance operations and production lines where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 specifications meeting SAE J429 Grade 8 requirements with Class 2A thread fit tolerance for precise engagement. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features right-hand UNC coarse threads with 16 threads per inch on 0.375" diameter, ensuring interchangeability and standardization across industrial applications.