SMART Torque Wrench Kit - Set of 6 Open-End Wrenches 17-22-24-26-27-29 mm - Adjustable Torque from 0 to 75 Nm, in Carrying Case

The SMART Torque Wrench Kit is the compact, versatile solution engineered for HVAC/R installers and service technicians working on air conditioning, heat pump, and refrigeration systems. Specifically designed for code-compliant tightening of flare nuts, it prevents both refrigerant micro-leaks caused by undertightening and flared copper cracking or yield caused by overtightening — a critical factor for maintaining circuit integrity with high-pressure refrigerants like R410A and flammable A2L/A3 alternatives (R32, R290).

The ergonomic handle features a clearly marked graduated scale with adjustment from 0 to 75 Nm and an integrated locking collar to prevent setting drift during operation. The internal click-stop mechanism provides distinct tactile and acoustic feedback once target torque is reached, ensuring quick, repeatable procedures aligned with manufacturer tightening specifications for split units and chillers.

Main Features

0 – 75 Nm Operating Range: Flexible calibration span suited for all standard flare connections on 1/4", 3/8", 1/2", and 5/8" refrigeration copper lines.
Set of 6 Interchangeable Open-End Heads: Complete selection of open-end heads in 17, 22, 24, 26, 27, and 29 mm with quick-connect ball detent retention.
Calibrated Click-Stop Release: Unmistakable tactile and audible click signal indicating exactly when to stop applying force.
Micrometric Adjustment with Lock: High-visibility laser-etched scale knob paired with a locking collar to eliminate accidental torque changes.
Durable Forged Steel Construction: Handle body and inserts manufactured from high-tensile alloy steel treated against corrosion and jobsite wear.
Rigid Blow-Molded Case: Heavy-duty molded carry case engineered to protect tool calibration and keep the handle and heads neatly organized.

Technical Specifications

Parameter	Detail / Value
Product name	SMART Torque Wrench Kit with interchangeable heads
Type	Mechanical click-type torque wrench with interchangeable drive
Torque range	0 – 75 Nm
Included open-end heads	17 mm, 22 mm, 24 mm, 26 mm, 27 mm, 29 mm
Refrigeration line compatibility	1/4" to 5/8" copper lines (OD 6.35 – 15.88 mm)
Surface finish	Matte chrome plating with anti-corrosion protective treatment
Packaging	Heavy-duty blow-molded carrying case with snap latches

Kit Contents

1 SMART adjustable torque wrench handle (0–75 Nm)
6 Interchangeable open-end inserts (17, 22, 24, 26, 27, 29 mm)
1 Heavy-duty protective carrying case

Use and Maintenance Notes

Calibration warning: At the end of each job and before returning the tool to its case, always wind the torque setting back down to the minimum value on the scale. This prevents the internal spring from staying under prolonged load, preserving accuracy over time. Never use the torque wrench to loosen seized fasteners or bolts.