Proto Standard Arm Hex Key - 9/16" J46136-SBD

Proto's professional-grade 9/16" standard arm hex key, built for maximum torque and performance in heavy-duty industrial and mechanical applications. Forged from high-strength alloy steel and precision heat-treated, this L-key is engineered to maintain its structural integrity even under substantial rotational loads. Its precision-machined tips ensure a tight, secure fit into large hex fasteners to prevent rounding, while the industrial black oxide finish provides long-lasting protection against rust and corrosion in demanding work environments.
Key Features
Sized at 9/16" for precise engagement with large-scale fractional hex socket fasteners.
Manufactured from heat-treated alloy steel for exceptional toughness and professional-grade durability.
Industrial black oxide finish offers superior resistance to rust and chemical corrosion.
5-3/4" long arm and 1-3/4" short arm provide the substantial leverage required for high-torque tasks.
Precision-cut ends facilitate full engagement with the fastener head to minimize stripping.