Measuring Screws

 

Who wants to measure a screw correctly should consider the following. The screw size is always the same for all screws. First the thickness or the screw diameter is indicated and then the screw length.

 

   Example:   3,5 x 50    (Wood Screws)

The diameter is 3,5mm and the length 50mm.

 

                    M3 x 20   (Metric Screws)

The diameter is M3 and the length 20mm.

 

 The easiest way to measure a screw is with a caliper gauge. To measure a screw, proceed as follows in two simple steps:

 

1. Step - Measuring Screws

Measure screw diameter correctly, measure screw thickness correctly
Measuring Screw correctly

 

In order to measure the diameter of a screw correctly, one must note that one measures on the thread and does not accidentally place the caliper between the thread. If you insert the screw crosswise into the caliper, the probability of a measuring error is very high, because the jaws of the caliper can slip between the threads. The screw must therefore be inserted lengthwise to the legs of the caliper. The diameter of a screw is always measured on the thread.

 

2. Step - Measure Screw length

Screw, measure length correctly
Socket Head Screw, measure length correctly

 

In order to measure the length of a screw correctly, it is necessary to know that the part of the screw that can be screwed into the material is indicated as the screw length.

 

For cylinder head screws or pan-head screws, for example, only the thread length is measured, i.e. from the underside of the screw head to the tip of the screw. This can best be measured with the caliper depth gauge, see the picture on the left. Only the part that penetrates into the material is measured!

 

Flat Head Screw, measure length correctly
Flat Head Screw, measure length correctly

But watch out! Countersunk head screws are an exception here, here the head of the screw is also measured, as it disappears completely into the material when screwed in. With countersunk screws you can clamp the entire screw between the two jaws and measure the screw length, see picture on the left.

 

Measuring a screw correctly is not difficult with a caliper gauge and now you know how to do it!

 

You don't have a caliper yet, then you can buy it here.. 

Measuring Wood Screws

 

Who wants to measure a wood screw has to know that with wood screws first the thickness or the screw diameter and afterwards the length of the screw is indicated.

 

Example:     5 x 50 (wood screw)

                    The diameter is 5mm and the length 50mm.

 

In order to measure a wood screw precisely, a caliper gauge is best suited. We would like to explain to you in two simple steps how to measure a wood screw correctly.

 

1. Step - Measuring the Diameter of Wood Screws

Measuring the Diameter of Wood Screws, Measuring Wood Srews, Measuring Screws correctly
Measuring the Diameter of Wood Screws

 

In order to measure the diameter of a wood screw correctly, one must note that one measures on the thread and does not accidentally place the caliper between the thread of the wood screw. If you insert the screw crosswise into the calliper, the probability of a measuring error is very high, because the jaws of the calliper can slip between the threads. The screw must therefore be inserted lengthwise to the legs of the caliper. The diameter of a screw is always measured on the thread.

 

2. Step - Measuring the Length of Wood Screws

Measuring the Length of Wood Screws
Measuring the Length of Wood Screws

In order to correctly measure the length of a wood screw, it is necessary to know that the part of the screw that can be screwed into the material is indicated as the screw length. For wood screws with a lens head, for example, only the thread length is measured, i.e. from the underside of the screw head to the tip of the screw. This can best be measured with the depth gauge of the caliper gauge. Only the part that penetrates into the material is measured!

 

But beware! Wood screws with countersunk head are an exception here, here the head of the screw is also measured, since this disappears completely in the material when screwing in. With countersunk screws you can clamp the entire screw between the two jaws and measure the screw length, see picture on the left.  

 

Measuring a wood screw correctly is not difficult with a caliper gauge and now you know how to do it!

 

You don't have a caliper yet, then you can buy it here.