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techtalk:ref:tools810 [2021/01/21 03:02] hippysmack [US Threads] |
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| - | ====== REF: Thread Identification ====== | ||
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| - | ====== Threads Per Inch (TPI) vs Thread Pitch ====== | ||
| - | Thread Pitch and Threads Per Inch are both used to measure the threading of a bolt or nut to ensure that they are going to couple together properly. ((https://www.albanycountyfasteners.com/blog/thread-pitch-vs-threads-per-inch-tpi/)) \\ | ||
| - | If the threading of a bolt and nut are different, they will either seize or strip the threading resulting in an unusable connection. \\ | ||
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| - | Threads per inch, commonly abbreviated as TPI, is a term frequently used in US fasteners and is a term used to help identify how many threads are in an inch. \\ | ||
| - | To determine treads per inch, an inch of the threads are measured longways and then the peaks on the fastener are counted within that inch. \\ | ||
| - | For threads shorter than 1 in, you can measure half an inch of threads and double the result to get the TPI. \\ | ||
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| - | Thread pitch is a term used in place of TPI in metric fasteners and is the distance from one thread to the adjacent thread measured longways across the thread peaks. \\ | ||
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| - | ====== US Threads ====== | ||
| - | US threads generally have 3 numbers although the last can be left off unless required. \\ | ||
| - | The first number is a whole number and/or fraction, the second number is the threads per in (TPI), followed by the length in inches. \\ | ||
| - | The diameter is the outside diameter of the thread peaks. \\ | ||
| - | In this example of a 1/4" bolt bolt; 1/4" x 20 x 1-1/2" states that the app. diameter of the threads is 1/4", the TPI is 20 and it's 1-1/2" long. | ||
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| - | | US Thread Pitch |||||| | ||
| - | |Bolt Diameter|TPI (course)|TPI (fine)|Bolt Diameter|TPI (course)|TPI (fine)| | ||
| - | |**1/4"**|20|28|**3/4"**|10|16| | ||
| - | |**5/16"**|18|24|**7/8"**|9|14| | ||
| - | |**3/8"**|16|24|**1"**|8|12| | ||
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| - | ====== Metric Threads ====== | ||
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| - | Metric bolts are written down as an "M" followed by 3 numbers and again the last can be left off unless required. \\ | ||
| - | The first number is the diameter, the second the thread pitch, and the third the length in millimeters. ((http://raygirling.com/metthrpt.htm)) \\ | ||
| - | The diameter is the outside diameter of the thread peaks. \\ | ||
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| - | In this example of a 10mm bolt; M10x1.25x35 states that the diameter of the threads is 10mm, the thread pitch is 1.25mm and it's 35mm long. \\ | ||
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| - | | Metric Thread Pitch |||| | ||
| - | |Bolt Diameter|Standard Thread Pitch (mm)|Fine Thread Pitch (mm)|Extra Fine Thread Pitch (mm)| | ||
| - | |4mm|0.70| - | - | | ||
| - | |5mm|0.80| - | - | | ||
| - | |6mm|1.00| - | - | | ||
| - | |7mm|1.00| - | - | | ||
| - | |8mm|1.25| 1.00 | - | | ||
| - | |10mm|1.50| 1.25 | 1.00 | | ||
| - | |12mm|1.75| 1.50 | 1.25 | | ||
| - | |14mm|2.00| 1.50 | - | | ||
| - | |16mm|2.00| - | - | | ||
| - | |18mm|2.50| - | - | | ||
| - | |20mm|2.50| - | - | | ||
| - | |24mm|3.00| - | - | | ||
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