The most important consideration when choosing a tape measure is precision. And, of course, whether the tape is a smart and adroit tool to use on the job. We place considerable emphasis on these considerations during the manufacturing process and have introduced a quality system that is certified in accordance with ISO 9001.

The majority of our measuring tapes are graduated using inkjet technology. By doing so, we achieve a high level of precision and achieve EU Class I, the most exact tolerance class, on both our short and long measuring tapes. Once graduated, we coat each tape with a layer of matt polyester lacquer that has an anti-reflective effect.

Hultafors tape measures

Tape measurement accuracy.

Measurement accuracy is a very important feature of a tape measure. It is measured and stated in the form of a tolerance class. In Europe, we normally classify measuring tapes in EU Class I and EU Class II. The accuracy is measured at 20°C and 50 N pull force for steel tape and 20°C and 20 N pull force for fiberglass tape.

STEEL TAPE MEASURE PRODUCTION TOLERANCES
Total length (m) Class I (mm) Class II (mm)
2 ± 0.3 ± 0.7
3 ± 0.4 ± 0.9
5 ± 0.6 ± 1.3
8 ± 0.9 ± 1.9
10 ± 1.1 ± 2.3
15 ± 1.6 ± 3.3
20 ± 2.1 ± 4.3
25 ± 2.6 ± 5.3
30 ± 3.1 ± 6.3
50 ± 5.1 ± 10.3
100 ± 10.1 ± 20.3

Offset for measurements (including end hook): Class I: 0.1 mm, Class II: 0.2 mm.

Measruing outside

Changing lengths.

Often we experience significant temperature differences between summer and winter, differences that affect the length of a steel tape measure. All tolerances quoted here apply at 20°C, so it is important to be aware of the measurement deviations for various temperatures.

LENGTH CHANGE FOR A STEEL TAPE MEASURE FOR TEMPERATUR DEVIATIONS FROM 20°C.
ΔT  10ºC  20ºC 30ºC
Length (m) Length change (± mm)
2 0.2 0.5 0.7
3 0.4 0.7 1.1
5 06. 1.2 1.9
8 1.0 2.0 3.0
10 1.2 2.5 3.7
20 2.5 5.0 7.4
30 3.7 7.4 11.2
50 6.2 12.4 18.6
100 12.4 24.8 37.2

Length change ΔL is calculated using the formula ΔL = L x ΔT x α
L = tape measure length, ΔT = temperature difference from 20°C.
α = length enlargement coefficient (1.24 x 10-5).

Example: If outdoor temperature is –10°C, the difference will be –30°C and so, for an 8 m long steel tape measure, the change in length will be –3.0 mm.

Measruing outside Hultafors long tape

Grading technology.

Most manufacturers of measuring tapes are using large wheels when grading, and then press the graduation by rolling off the scale on top of a steel band. This technique is easy to work with, but it can be some variations in the measurement scale because of the difficulty of getting a steady supply of steel band relative to the wheel. These variations only makes the achievement of EU Class II.

Graduation comparison Imagecaption=The matte polyester coating suppresses reflections.Hultafors measuring tapes are graduated primarily using inkjet technology. A print head applying graduation by typing the desired gradation.

The surface layer of matte polyester coating suppresses reflections - the difference is clearly visible against competing products. This technology affords a level of accuracy that makes our long and short tapes compliant with EU Class I requirements.

Good grip Hultafors long tapeGood grip.

Being able to keep a good grip of your tools is always important, including measuring tapes. Our longest measuring tapes feature stable and solid handles.

The smaller tapes are designed for hand-held use, with some having rubber fittings that provide a more secure and comfortable grip.

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