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The M8 is a metric screw size that is 8 millimeters in diameter and has a 1.25 millimeter thread pitch. The M stamping on the bolt/screw designates that it is a metric size, and the number indicates the nominal outer diameter in millimeters.
Length
A M8 screw is a metric size that measures 8mm across. This is the basic major diameter of the bolt, or screw. Many types of nuts will also be an M8 size, such as dome and nyloc nuts. These nuts are taller than standard nuts and sit flush against the surface of equipment and metal joints for a finished appearance.
These types of nuts are often used to secure items, such as electrical components. They are strong and offer a long lifespan because they are less susceptible to corrosion than nails. However, you should still use caution when handling these fasteners to avoid damaging them.
The length of a metric bolt or screw is determined by the combination of its diameter, thread pitch, and length. The diameter, or major diameter, is the outer diameter of the bolt shaft. The thread pitch is the distance between adjacent threads. This value is typically indicated in millimeters (mm). This information helps users to quickly and easily find the correct type of fastener for their projects.
Diameter
When buying screws, it’s important to know their diameters. This allows you to find the right screw for your project. Generally, screws will be labeled with the letter M followed by a number that indicates their shank size in millimeters. The number will also have a thread pitch and length attached to it.
For example, an M8 bolt has a diameter of 8 millimeters and a thread pitch of 1.25 mm. This makes it suitable for a variety of applications. You can use it for bike rack eyelets, fender/rack eyelets, shifter mounts, and water bottle mounts.
It’s also a common bolt size for flat screen TV mounts. You can find them at most hardware stores. It’s best to buy them with the correct nut to avoid damaging your equipment. You’ll need a spanner or Allen key that matches the screw’s size to tighten it. The key will prevent the screw from sliding around while you’re working.
Thread Pitch
M8 screws have a thread pitch of 1.25 mm. Generally, the M mark indicates a metric bolt and the number after it indicates the diameter of the shaft. In the US, sizes are designated by TPI or Threads Per Inch. However, metric bolts are still sometimes specified by their major diameter and thread pitch.
On a bike, M8 bolts are most commonly used in brake caliper and derailleur mounting bolts, quill stem bolts, and shifter cable anchor bolts. It’s also possible to find them in some seat post bolts and other threaded bike components.
The difference between the TPI of an M8 screw and the TPI of a 5/16 screw is significant. Unless the bolt is intentionally used at higher TPIs to increase holding power, you should never mix and match these two types of fasteners. You could cause damage or create a weak point in your machine if you use the wrong bolts together.
Proof Load
When working with screws, it’s important to use the proper sized spanner or Allen key. If you use one that’s too big, it may damage the screw or nut. To avoid this, many manufacturers will include a standard size that fits the specific screw on their product.
The proof load of a screw is the amount of weight it can hold without failing. This is determined by standards, and it’s usually considered the absolute maximum load a bolt should be asked to bear. In practice, manufacturers will often form their machinery so that the bolts carry a lot less than this in order to give a safety factor to the design.
Other specifications for bolts include the yield strength, Vickers hardness and tensile strength. These are all set by standards to help identify different types of fasteners. They are typically listed in pound-force (lbf) and kilopound-force (klbf) units of force respectively. In some cases, only proof load requirements are specified while others specify both yield and tensile strength.what size screw is M8