Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Improvised Torque Wrench

Sponsored Links

If you don't have a torque wrench available - or if you want to check the readings of the one you have - it is easy to improvise by using a standard wrench and a scale as indicated in the figure above.

The moment - or torque - can be calculated

T = F a                                       (1)

where

T = moment or torque (Nm, lb f ft)

F = applied force (N, lb f )

a = length of the wrench (m, ft)

Note! - Most scales in the SI unit system measures weight - force due to the acceleration of gravity - in kg .

The reading from the scale can be converted to N by using

F = m g

where

m = reading of the scale (kg, lb f )

g = acceleration of gravity (9.81 m/s2, 32.17 ft/s2)

Example - Measuring Torque with a standard Wrench and a Luggage Scale - readings in kg

The reading of the scale at the end of the wrench is 10 kg . The length of the wrench is 0.3 m . The moment exerted can be calculated

T = (10 kg) (9.81 m/s2) (0.3 m)

= 29.4 Nm

Example - Measuring Torque with a standard Wrench and a Luggage Scale - readings in lb f

The reading of the scale at the end of the wrench is 20 lb f . The length of the wrench is 6 in . The moment exerted can be calculated

T = (20 lb f ) (6 in)

= 120 in lb f

= 10 lb f ft

" Luggage Weight - Wrench " Online Torque Calculator


Scale Wrench Torque Diagram - SI units

Download and print Scale Wrench Torque Diagram

Example - Torque Settings for a Cylinder Head

The torque settings for a cylinder head in a car engine are specified to 30 Nm.

According to the diagram above with a wrench with length 0.2 m - the scale readings should be approximately

14 kg

Scale Wrench Torque Diagram - Imperial units

Download and print Scale Wrench Torque Diagram

Sponsored Links

Related Topics

Fasteners

Bolts, nuts and threaded rods - torque, tension and loads.

Mechanics

The relationships between forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more.

Related Documents

Angular Motion - Power and Torque

Angular velocity and acceleration vs. power and torque.

Bolt Torque Calculator

Calculate required bolt torque.

Car - Required Power and Torque

Power, torque, efficiency and wheel force acting on a car.

Disk Brakes - Torque and Force

Forces and torque activated with disk brakes.

Electric Motors - IEC and NEMA Standard Torques

IEC and NEMA torque classifications of electrical motors.

Electric Motors - Torque vs. Power and Speed

Electric motor output power and torque vs. rotation speed.

Gear Reducing Formulas

Output torque, speed and horsepower with gears.

Levers

Use levers to magnify forces.

Lifting Wheels

Loads and effort force with lifting wheels.

Metric Bolts - Tightening Torques

Recommended thightening torque metric bolts.

Piston Engines - Displacement

Calculate piston engine displacement.

Reduced Torque with Lubricated Bolts

Lubrication effect on bolt tension and torque.

Screw Jack - Effort Force vs. Load

Screw jacks and effort forces.

Shafts Torsion

The torsion of solid or hollow shafts - Polar Moment of Inertia of Area.

Torque - Work done and Power Transmitted

The work done and power transmitted by a constant torque.

Torque or Moment of Force - Online Converter

Torque or moment - the tendency of a force to rotate an object.

US Bolts - Tightening Torques

Recommended bolt torques.

Whitworth Bolt Torques

Torque specifications Whitworth bolts.

Sponsored Links

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.