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5. UNITS OF MEASURE
What is a Unit of Measure?
‘A unit of measure can be described as a standardised quantity of a physical property, used to determine
multiple quantities of a given property. For example:
© Weight
* Length
= Mass
* Force
Different systems of units are based on different choices of a set of fundamental units. The most widely
used system of units is the International System of Units, or SI, There are seven SI base units, All other SI
units can be derived from these base units,
36
Under the SI system when marking lifting equipment only one decimal point is used for fractions of a tonne
eg. 2.18, apart from when marking 0.25 which is always to two decimal places.
eg, 2.11, 2.2, 2.25t, 2.3t, 2.4t, 2.5t, 2.6, 2.7t, 2.8t, 2.9t
Note: Some manufacturers also use .75
SI Base Units
Metre for length
+ Kilogram for mass
* Second for time
+ Ampere for electrical current
* Kelvin for temperature
* Candela for luminous intensity
* Mole for amount of substance
Imperial Units (Examples)
+ Thou, inch, foot and yard for length
* Acre for area
Fluid ounce, pint and gallon for volume
* Pound, stone, hundredweight and Ton for weight
OLEEA Academy
Foundation ~ Step Notes ~ August 2017 v1.7
Citys. | Accredited
Guilds | Programme Conversions
‘Some countries use different versions of the same measurement. For example:
1907 tonne (metric) |
723953 bs (pounds)
| Rounded to 2240 Ibs
(hundred weight)
Hundredweight
Occasionally, lifting accessories may be found in service today with a marked safe working load or working
load limit of ‘ewe’
Lhundredweight (cwt) = 50 kg
Hence, a marked load limit of 2 Ton 1 cwt = 2050kg, rounded down to 2t.
‘The hundredweight was established in the imperial measurement system in which 1 Ton is divided into 20
subdivisions, each being a hundredweight.
Other useful conversions for the potential lifting equipment inspector:
akg
Linch = = 25.4mm
foot = 42 inches
A2inches = 304.8mm
1OkN = 1000kg
Notes:
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