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Ruuvituotesarjan muodostuminen

Metric Screws

It is known as the screws M4 and M5 and of this may indicate. The size of screw will grow by a factor 5 / 4 = 1.25. In practice, the M20 screw is the maximum which is normally used. Larger screws have slightly different dimensions, but this is not significant.

1,25 x 1,25 x 1,03 = 1,618 = The Golden Section ratio

4 - 5 - 6(,3) - 8 - 10 - 12(,5) - 16 - 20 - 25

1,25 x 4 = 5 mm

1,25 x 5 = 6 mm

1,25 x 6,3 = 8 mm

1,25 x 8 = 10 mm

1,25 x 10 = 12 mm

1,25 x 12,5 = 16 mm

1,25 x 16 = 20 mm


Golden Section Ratio 1,618

4 mm screw: 4 x 4 = 16

5 mm screw: 5 x 5 = 25         =>  25 / 16 = 1,6(18)

 

8 mm screw: 8 x 8 = 64

10 mm screw: 10 x 10 = 100   => 100/64 = 1,57 x 1,03 = 1,6(18)

 

16 mm screw: 16 x 16 = 256

20 mm screw: 20 x 20 = 400   =>  400 / 256 = 1,57 x 1,03 = 1,6(18)

 

The following calculated screw sizes are M25, M32 and M40. In practice, the corresponding screws are M24, M33 and M42. Of these, M33 screw sizes are not favored, although the size of the screws are still available. Similarly, M40 mm screw size has been selected size of 42 mm. This has its own reasons, which can not be guessed or determined in this context.
The quality features of the product are usability and safety. We find the screw sizes to comply with the Golden Section Ratio, which ensures safety. When calculating the stresses, they are found to be at the same level for all screw sizes.

0,785 x1,25 x 1,03 = 1

0.785 is the square and circular cross-sectional area ratio

 0.785 is the specific gravity of steel

We calculated the size formation of the screws & the strength formation of the product. As all phenomena are derived from the simple formula E = m c c, the products are determined by a simple product, such as a screw.

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17.1.2015*10:59 (991 - 707)
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