S-91512A170 10-32 x 1/2" Left-Hand-Thread Stainless Steel Hex-Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Exceptional thread engagement with Class 3A precision fit and fine thread spacing for reliable, vibration-resistant fastening
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Optimal flush mounting with standard flat head profile and 82° countersink angle for clean, secure installations
• Left-hand threading advantage providing specialized functionality for reverse-thread applications and safety-critical assemblies
• Full-thread design efficiency ensuring maximum grip length and consistent holding power along the entire fastener
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

These 10-32 UNF left-hand thread flat head screws deliver critical engineering solutions where standard right-hand fasteners would compromise safety or functionality. The combination of 18-8 stainless steel material with passivated finish provides exceptional resistance to corrosion and chemical exposure, making them ideal for marine equipment, food processing machinery, and outdoor industrial applications. The Class 3A thread fit with fine thread spacing ensures precise engagement that resists loosening under vibration, while the 82° countersink angle creates seamless flush mounting in precision assemblies. These left-hand thread screws are specifically engineered for applications requiring reverse-thread security, such as rotating machinery components where standard threading would naturally loosen during operation.

Specification Summary & Compliance

This fastener maintains Class 3A thread fit tolerance according to UNF standards with 10-32 thread size and fine thread spacing. Manufacturing specifications include Rockwell B70 hardness and 70,000 psi tensile strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring adherence to international standards for hazardous substance restrictions and chemical safety.