QH19D Ratchet Head, 19D, 1/2" Sq Drive

Tohnichi QH19D is a durable ratchet head engineered as an interchangeable accessory for torque wrenches, enabling precise bolting in confined spaces within demanding assembly environments such as automotive production, machinery maintenance, and general industrial applications. Providing a reliable 1/2" square drive (19D size) with a 36-tooth ratchet mechanism for smooth, one-way operation, this head ensures secure torque transmission without slippage, compatible with Tohnichi DB, DBN, and other series wrenches. Lightweight and compact with high-strength construction, it facilitates quick head swaps to adapt to various fastener sizes, promoting operator efficiency, reducing setup time, and maintaining accuracy in torque-sensitive workflows.

Key Performance Specifications

• Drive Size: 1/2" Square (12.7 mm insertion angle)
• Head Type: Ratchet square drive (19D)
• Ratchet Teeth: 36 teeth (10° engagement angle for fine control)
• Head Width: 28 mm
• Compatibility: Tohnichi DB, DBN, and interchangeable head torque wrenches
• Torque Capacity: Up to wrench rating (typically 50 - 500 N·m depending on wrench model)

Physical and Environmental Specifications

• Weight: 0.5 lbs (0.23 kg)
• Dimensions: 5" L x 3" W x 2" H (127 mm x 76 mm x 51 mm)
• Material: High-strength alloy steel with hardened finish
• Operating Temperature: 14°F to 104°F (-10°C to 40°C); suitable for standard workshop conditions
• Storage Conditions: Dry environment to prevent corrosion; indefinite shelf life

Key Features

• 36-Tooth Ratchet Mechanism: Fine 10° engagement enables smooth, controlled one-way rotation in tight spaces, reducing backlash and improving precision
• Secure Square Drive: Rigid design ensures positive engagement with sockets, preventing slippage during torque application
• Quick-Change Compatibility: Effortless attachment to Tohnichi wrench handles for rapid adaptation to different drive sizes and tasks
• Durable Hardened Construction: Alloy steel build withstands repeated impacts and loads, extending tool lifespan in industrial settings
• Compact Profile: Low-profile head minimizes interference in confined areas, enhancing access during assembly operations
• Applications: Optimized for interchangeable head setups in automotive, machinery assembly, and maintenance; excels in precision bolting and torque auditing in space-constrained workflows