S-90585A628 3/8"-16 x 1 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh chemical and marine environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance in heavy-duty applications
• Precision thread engagement through Class 3A thread fit and UNC coarse threading ensures secure fastening and vibration resistance
• Optimal flush mounting with 82° countersink angle and flat head design for smooth surface finishes and reduced snagging
• Efficient installation and removal with hex drive (7/32") providing positive torque transmission and reduced tool slippage
• Full-length threading offers maximum grip along the entire 1½" length for enhanced load distribution
• Regulatory compliance assurance meeting ASME B18.3 specifications while being RoHS 3 and REACH compliant for global industrial use

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 Stainless Steel flat head screws deliver exceptional performance where corrosion resistance and mechanical reliability are critical. The combination of UNC coarse threading and Class 3A thread fit provides superior vibration resistance in machinery, structural assemblies, and marine equipment. The passivated finish enhances surface durability while maintaining chemical resistance in processing plants and offshore applications. With full threading along the entire 1½" length and 82° countersink angle, these screws ensure flush mounting in precision assemblies while distributing loads evenly. The hex drive design allows for high-torque installation in confined spaces, making them ideal for maintenance operations and original equipment manufacturing where reliability cannot be compromised.

Specification Summary & Compliance

These flat head screws maintain precision Class 3A thread fit tolerances with UNC 3/8"-16 coarse threading and are manufactured to ASME B18.3 specifications. The dimensional accuracy includes head diameter tolerance of -0.061" to 0" and standardized 82° countersink angle. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and global market acceptance for industrial procurement.