Industrial SF121 Three Eighth Inch Drive 12 Point Deep Socket

Snap-On SF121 is a chrome-plated, 3/8-inch drive, 12-point deep socket designed for SAE fasteners. Built with Flank Drive technology, it grips the fastener on the flats to deliver improved turning power and reduced rounding in demanding mechanical work. The deep profile provides extended reach to nuts recessed in engines, gearboxes, or other assemblies where a standard socket won’t access. As a 12-point design, it accepts double-hex and hex-fasteners, offering versatile engagement for automotive and industrial maintenance tasks. The SF121 is compatible with 3/8-inch drive ratchets, extensions, and universal joints, making it a reliable choice for professionals needing access in tight spaces. The chrome finish enhances corrosion resistance and eases cleanup in typical shop environments while maintaining a bright, low-friction surface for repeated use. This socket represents Snap-On’s precision-grade approach to inch-size, 12-point sockets within the 3/8-inch drive family.