The Threads on a Bolt are the ridges or grooves that screws into a Nut or into a metal frame or such.
It's the number of threads per inch
8mm is metric size for bolt125 pitch is the number of threads per inch
Bolts are manufactured with the help of bolt making machines, a hexagonal shaped or round shaped rod is inserted into the machine, where in first stage head is formed by the block of the design of your choice, and at the scond and final stage threads are formed of the size chosen accoding to your need.
Talking Threads was created on 2009-10-14.
Strangling Threads - 1923 is rated/received certificates of: UK:U
NPT = pipe Briggs standard = Pipe NFT and NFC and ASAE = bolt
Judging by the video of someone using the starter to break the bolt loose the threads are regular right handed threads
The grip length of a bolt is the distance from the head of the bolt to the nut or where the threads start.
bolt strength markings. Numbers represent metric threads and slashes represent standard threads (the greater the number/slashes, the greater the strength of the bolt.
You can use a helicoil but they are not rated for high torqque ratings. If it were me I would tap the threads to the next bolt size up and use the bigger bolt.
As a general rule, a bolt should engage a distancegreater than or equal to its outer diameter. The number of threads engaged can then be calculated from the number of threads per inch on the bolt. So if you are using a 1/4-20 bolt, meaning it has 1/4" diameter and 20 threads per inch, you should engage the bolt 1/4" into the hole, or 5 threads. (20 threads/inch x 1/4 inches)Why: The shear stress on the threads will be equal to the tensile stress in the shank of the bolt. This means that once you thread the bolt in a distance greater than its diameter, the shank itself will fail before the threads shear off the bolt under tensile load.Sources: Design of Machinery class at Purdue University, page 10 of the following MIT article: http://web.mit.edu/2.75/resources/FUNdaMENTALs%20Book%20pdf/FUNdaMENTALs%20Topic%206.PDF
Internal threads are threads inside of a hole in something. Like a nut, for instance. External threads are threads on the outside of a cylindrical object. Like a bolt, for instance. hth, Steve
Standard thread are meassured in number of threads per inch (example 1/4-20) 1/4 inch dia. bolt with 20 threads per inch. Metric threads are measured in mm between thread (M8 x 1.5), an 8 MM bolt with a thread pitch of 1.5MM between threads.
If you have stripped the head of a head bolt you will need to either obtain a special socket that grabs stripped bolt heads (Craftsman makes one), or you will need to drill the center out of the bolt and insert an "easy out." The second option is extremely difficult. Your third option, if you are very accurate and surgically precise would be to drill the bolt to only the inside diameter of the threads. This will cut the threads of the bolt off into the threads of the hole. Then you can use a tap to clear the threads, being very careful not to allow any metal shavings to fall into the engine.
Standard rh threads
the crank pulley bolt has standard threads.
the easiest way is to drill it out. drill a hole thru center of broken bolt, make sure it is smaller then the diameter of the bolt. after drilling use a easy out to remove the threads of the bolt. check that the threads in the head are ok! then put in new bolt.