Tag Archives: Metric bolts
It’s easy to get confused when deciding whether to use a fully or partially threaded metric bolt for a particular assembly. Often, people simply use whatever bolt is available—assuming that if it fits, it’s probably close enough. However, it’s important to bear in mind that the size of a bolt hole is just one small part of the overall engineering that goes into a completed assembly.
How a bolt grips and how loads are distributed by the bolt, are critical factors in the strength of a union. Bolts grip and distribute differently, depending on variables such as thread pitch, head size and, of course, whether the bolt is fully or partially threaded. To ensure proper grip and resistance to breakage, it’s important to use a bolt that meets the original engineering specs.
Spring is in the air, and that means a lot of people will be dusting off their bicycles and heading out for long rides. The question is, are those bikes ready for another season of two-wheel adventures? Worn or loose fasteners and bolts can turn a pleasant ride into a nightmare. Before hopping on your bike, make sure it’s up to the task.
A bicycle is made up of a surprising number of parts. All of those parts are held together by various metric bolts and washers. If any one of those metric fasteners are worn or incorrectly sized, parts can come loose and you may be at risk for injury. Here, we’ll take a look at some of the most important systems of a bicycle, and the most common metric fasteners used by those systems.
Charles uses Mr. Metric stainless steel 6M bolts to attach his gearbox to his electric bike. He’s happy with his purchase, which is great for both performance and safety.
Why the 6M Bolts Fit His Needs:
These specific types of bolts are an ideal fit for such a task, because the stainless steel grade 8.8 material is extremely resistant to rust and corrosion. The flange bolts come up with an attached washer that uses tiny teeth to ensure a secure clamp against any flat surface.
Do your eyes glaze over at all the metric bolt choices? We know it can be kind of confusing, especially if you’re not used to ordering metric parts. Let’s look at the meaning of some common terms in the world of “bolt-ology.”
Bolts have different heads that identify their use for different applications. Hex bolts, for instance are simply bolts that have a hexagonal, or six-sided shape to their head. These bolts may have threads extending either halfway or all the way down the shaft and generally require nuts and washers to hold themselves in place. Flange bolts are instantly identifiable by a flat flange that somewhat resembles a washer peeking out from underneath the head but is actually part of the head itself. The flange grips onto the substrate and distributes the clamping force across it just as a washer would, saving you the need for that separate part.
There’s no single, universal steel. The fact that steel is an alloy, a mix of different elemental minerals, practically guarantees that there is more than one way to make the stuff. As a result we have steel in a variety of compositions, each of which can withstand a certain amount of abuse and perform well under specific conditions. We assign grades to steel to make these differences clearer. Generally, the more carbon a steel fastener contains, the more it can be hardened, and the addition of other metals may provide other desirable qualities as well.