Types of Torque Wrench


DESCRIPTION: Also referred to as a "click" wrench, these are the most popular type of mechanical torque wrench. An internal spring is tightened by turning the handle. The spring pushes against a block, and both are calibrated so the block pivots when the torque setting has been reached. This quick pivoting creates the "click" sound. When the force at the handle is released, the block resets to its original position and is ready for the next torque application.

OPERATION: Set the desired torque value by pulling down on the lock ring while turning the handle. Al- ways
approach torque setting from a lower setting. The tube displays the major torque values, and the lock ring has the
minor torque values. Apply force at the handle until the "click" is felt or heard, and then release force.

ADVANTAGES: Most common type of torque wrench. "Click"felt at the handle indicates torque value reached.
Rugged, durable legacy design.

DISADVANTAGES: After day's use, internal spring pressure must be released by unwinding the handle.

APPLICATION: Highly versatile: any general-purpose torque applications: auto engine, machine maintenance,
construction, oil field, compressor/generator, etc.

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Torque Definitions

R.S.M.El. — American Society of Mechanical Engineers, known for setting codes and standards for mechanical
devices, including torque.

CW — Clockwise. Used in all accuracy statements & Certs. Some tools have different accuracy depending on direction of use.

CCW— Counter Clockwise

Calibration - Adjusting a torque tool or a torque transducer to bring it back within spec, which is performed on a
calibration system such as the CDI 2800-1 or 2000-1. Typical calibration accuracy is t 4% CW of indicated

Certifications — Also called a "Cert", this is a form which lists the results of the calibration test. Almost all CDI tools are supplied with a N.I.S.T. traceable cert. CDI also conforms to the ISO 6789, which is the standard set forth by the International Organization for standardization (ISO) for torque measurement...

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Safety & Performance. Applying accurate torque is critical to assembly applications, engines
and precision equipment.

- Creating a proper clamp load is the main objective when applying torque to a fastener.
Engine cylinder heads, pipe coupling, wheels, all need to be “clamped" uniformly to specific
torque values.

- There are three main factors that affect the correct application of torque: (1) Condition of
components, (2) Accuracy of torque instrument, (3) Properly applied torque values.

- Appling torque incorrectly can lead to stripped threads, premature loosening or broken
fasteners that can cause catastrophic failure. Leaking joints may cause engine or equipment
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Qualifying the need and cost savings of an in-house calibration system is relatively easy.

1) Perform a simple "Torque Audit" of your facility:

A) Identify how many torque wrenches are used in the facility.
B) What types of torque wrenches are used? Micrometer, dial, digital, torque screwdriver, etc.
C) What are the torque ranges of the tools, low to high?
D) Do you have a Quality Control lab, tool room, or maintenance department that would perform the torque calibration? If so, meet with the leader and staff of that department to decide what you need.
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What is a torque wrench?

A torque wrench is any device that applies a pre-determined amount of torque to a fastener.
• It may be mechanical or electronic in design.
• A torque wrench has some type of indicating device which lets the operator know when the correct torque has
been achieved: "click" or "impulse-break"; feel; sound; lights; gauge; or some combination of these.

Quick Fact: The Micrometer Click Type Wrench (Shown) is the most affordable and common torque
wrench used today.
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