M8 fasteners is components that are used in many different type of mechanical work. M8 fasteners are small enough to fit into small joint in a piece of equipment but are also strong enough to allow those small fasteners to handle heavy loads. Because of these advantageous properties of being both small and strong, people often use M8 fasteners to attach items like valve covers, machine frames, bicycle parts, and furniture joints.
However, you must select M8 fasteners based off the thread pitch that are to be used with the joint that is to be fastened with the M8 fastener. Thread pitch measure the number of turns that are required to move the M8 fastener through the material. Coarse thread pitches will move more quick through the material and can better tolerate dirt and damage than fine thread pitches.
How to Choose and Use M8 Fasteners
Fine thread pitches has more threads within a certain length of the M8 fastener, indicating that there is a larger stress area for the fastener joint. Many individuals prefer coarse thread pitches due to the ease with which you can turn the threads to install the M8 fastener; however, an fine thread pitch can be used in those instances where lock washers or thread locker are to be used. When creating the threads for an M8 fastener, it is important to use the correct tap drill size for that particular M8 fastener.
Using a drill size that is too small for the M8 fastener will create issue in the tapping process that can lead to the tap becoming stuck or the tap breaking. Using a drill size that is too large for the M8 fastener will lead to the threads stripping when the person turns the M8 fastener. A reference grid can be used to determine the drill size for the M8 fastener relative to the percentage of thread engagement.
The percentage of thread engagement within a joint is another important factor; for instance, three-quarters engagement is preferred within steel joints but a lower percentage of thread engagement is required in aluminum joints to avoid damage the joint. A chart can be used to determine the correct torque values for the different classes of property for the M8 fasteners. The head style for the M8 fastener can play a role in the installation process for the fastener.
For instance, if the head is a hex head, there must be enough space to install a wrench onto the fastener. If the head is a socket head, the fastener will sit flush with the object that is to be fastened and only an Allen key will be required to turn the fastener. Button head fasteners distributes the load of the fastener over a larger area and are, therefore, often used on those visible furniture panels.
Countersunk head M8 fasteners allow the fastener to sit flush with the surface of the object that is being fastened to. It is important to ensure that the clearance holes, wrench size, and drive tools are set up according to the head style of the M8 fastener that is to be used. The torque specifications for M8 fasteners should not be applied to every situation with M8 fasteners.
You should use the dry torque specifications for M8 fasteners with dry threads. If lubricant or thread locker is used in the threads of the M8 fastener, less torque will be required to achieve the same level of tension between the two components that are to be fastened with the M8 fastener. Using the dry torque specification with lubricated threads could lead to overstressing the M8 fastener.
Therefore, you should reference a chart of these different specifications to ensure that the M8 fastener is not tightened to the point where the M8 fastener begins to yield. Since many of the use of M8 fasteners are those that require the fasteners to be taken apart and reassembled, such as on machine frames or furniture, M8 fasteners are often used in these type of applications. Coarse thread pitches are often used with those components that are to be taken apart and reassembled because this type of thread pitch will reduce the chance of cross-threading.
Fine thread pitches will hold the joint together more better if the joint experiences vibration. Therefore, the pitch of the threads will rely upon the vibration that the joint will experience and how often the joint is to be taken apart. The thread geometry for M8 fasteners is consistant.
The threads for M8 fasteners will always be of a sixty-degree angle with flat crests and roots. This type of angle and size of fastener provides consistent contact between the two mating component. The consistency in the geometry of the M8 fasteners means that one size of M8 fastener can be used for a variety of different application.
There are many different factor to consider for the installation of M8 fasteners. Therefore, a chart that indicates the relationships among these factors will assist in the installation process and remove any guesswork that is associated with installing the fasteners.
