BAN037 hex bolt w. large washer 0,9mm

An intermediate grade that has its reason

Nine tenths of a millimeter, multiplied by twelve, works out at 10.8 mm. On a real motorcycle that puts you exactly midway between a size ten and a size thirteen wrench, that is between a joint with six and one with eight millimeters of thread. It sounds like a needless division, but in a large scale it is precisely this step that is visible: between 0.8 and 1.0 mm there is a difference on a model that the eye catches.

The set joins a head with six faces and a washer of larger diameter; there is no nut in it. It is expected that the part will be installed in a drilled seat and will stay hidden from behind. Typically these are the side covers of an engine, the mounting of a radiator, exhaust brackets or the mounts of cable harnesses, where the back is covered by other parts anyway.

• A middle size of 0.9 mm between the neighboring grades
• It corresponds to a width of 10.8 mm on the real machine
• With no nut; the part is set into a drilled seat
• Engine covers, radiator, exhaust brackets, wiring mounts
• The step of the scale is clearly readable in a large scale

Choosing the right grade is possible even without a gauge. Compare the head in a photograph with something whose dimension you know, say with the width of a brake disc or with the pitch of the cylinder fins. The ratio of the two lengths is then enough to carry over to the model. As soon as it works out at around eleven millimeters of real width, reach for this size.

It remains to add why a middle size is reached for more often than one would expect. A motorcycle has most of its joints precisely in the band between six and eight millimeters of thread, and this grade lies in the middle. Anyone who is not sure will make the smallest mistake with it.