elektraLite MY 250I - Manual (Page 6)

5
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Safety-chain
M10 X 25mm
Using M10 (10mm) bolts screw the C clamps onto the base of
MY 250Ì make sure that the bolts are firmly
tightened but take care not to over tighten. Fit a suitable safety chain to MY 250Ì’s center hole and attach to the
truss or whatever MY 250Ì is attached to.
Metric explanation:- If you go to a good hardware store (like Home Depot or Lowe’s) you will be purchasing
bolts that have written on the packaging 10mm x 1.5mm x 25mm. [The last figure of 25mm can be a higher
value read on].
10mm is the diameter of the bolt itself. 10mm is roughly 0.4 of an inch. In engineering drawings 10mm is also
written or described as M10.
1.5mm is the distance between each thread or turn of the screw. Engineering drawings refer to this as the pitch
of the screw. Now in places like Home Depot they stock 10mm bolts with 1.0mm, 1.25mm and 1.5mm pitch. So
be careful you buy the right pitch: 1.5mm.
25mm is the
minimum length of bolt you should use. Bolts are available in 5mm steps. So you can get 25mm,
30mm, 35mm and so on. Choose the bolt that best fits the length you will need to hold the C clamp or whatever
clamping device you will be using.
Do not attempt to use any other bolt apart from M10 (10mm) with a 1.5mm thread. If you try to force a wrong
bolt size the threads in the holes will be ruined and rendered useless as a load bearing point. Then you’ll have
to replace the base of the fixture.
Finally, just FYI 25.4mm is 1 inch.