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100 Plus Standard Square 3/16 x 4 - Stanley Proto Industrial Tools

Part #: PO66-018

The Stanley Proto PO66-018 100 PLUS STD SQUARE 3/16X4 screwdriver is engineered for professional technicians and mechanics who demand reliability and precision in their fastening tasks. This robust tool delivers exceptional torque transfer and durability, making it an essential addition to any professional toolkit for a wide range of industrial and automotive applications.

Key Features

  • Precision Ground 3/16" Square Tip: Ensures accurate fastener engagement, minimizing cam-out and preserving screw heads for extended tool and fastener life.
  • Durable 4-Inch Chrome Plated Shaft: Provides superior resistance to corrosion and rust, extending the tool's lifespan in demanding work environments.
  • Bolster Reinforced Construction: Enhances the tool's overall strength and durability, making it resilient to bending and breaking under high torque applications.
  • Ergonomic, Full-Size Handle: Designed for optimal comfort and a secure grip, reducing hand fatigue during prolonged and intensive use.
  • Square Shank Design: Allows for the application of additional leverage with a wrench, providing extra torque when needed to loosen stubborn fasteners.
  • Superior Fastener Retention: The inherent design of the square drive (Robertson) tip helps retain the screw on the tool, enabling easier one-handed operation and improved efficiency.

Applications

This professional-grade square screwdriver is highly versatile and well-suited for a variety of tasks where square drive fasteners are prevalent. It is ideal for automotive repair and maintenance, particularly for components that utilize square drive screws. In industrial settings, it excels in equipment assembly, servicing, and general maintenance. Furthermore, the tool is invaluable for electrical installations and maintenance, commonly used on device and circuit breaker terminals, as well as clamp connectors. Its design allows for better torque control and reduces the risk of stripping, making it a reliable choice for critical fastening needs.

Specifications

  • Manufacturer: Stanley Proto Industrial Tools
  • Model Number: PO66-018
  • Tip Type: Square Drive (Robertson)
  • Tip Size: 3/16 inch
  • Shaft Length: 4 inches
  • Country of Origin: US
Only 2 left in stock - order soon

$6.88

Free shipping on orders over $250
Lower 48 states and DC. Excludes freight and oversize items.
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This product was added to our catalog on Saturday 11 July, 2026.

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