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techtalk:ref:tools810 [2021/01/21 19:02] hippysmack [Brake Line 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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| - | ====== Brake Line Threads ====== | ||
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| - | The most common sizes for brake line connections are 3/8"-24, 7/16"-24, 1/2"-20, 5/8"-18, 10mm-1.0 and 12mm-1.0. ((https://www.matcotools.com/catalog/product/BRKTH993/BRAKE-LINE-BRAKE-CYLINDER-RE-THREADING-KIT/)) \\ | ||
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| - | **3/8" x 24 vs M10 x 1.0mm** \\ | ||
| - | 3/8" x 24 TPI equates to a thread pitch of 0.0416666666666667" or 1.05833333mm. \\ | ||
| - | 3/8" x 24 stated in metric units equates to 9.525mm x 1.05833333mm \\ | ||
| - | So a 3/8" fitting is slightly smaller in diameter than the 10mm fitting but each thread is .058mm farther apart than a 10mm fitting's threads. \\ | ||
| - | | Conversion ||| | ||
| - | |3/8" x 24| 9.525mm dia.|1.05833333mm thread pitch| | ||
| - | |M10 x 1.0|10mm Dia|1.0 thread pitch| | ||
| - | |7/16" x 24|11.1125mm dia.|1.05833333mm thread pitch| | ||
| - | |M12 x 1.0|12mm dia.|1.0mm thread pitch| | ||
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| - | A 3/8" x 24 UNF American nut will thread very easily and loosely into a 10mm x 1.0 thread fitting but will most likely strip the threads when you tighten it down. ((http://www.fedhillusa.com/webnuts/common%20flares6.pdf)) \\ | ||
| - | You can start a 10mm x 1.0 threaded nut into a 3/8" x 24 UNF thread fitting but it will immediately begin stripping the threads. \\ | ||
| - | It will catch the first thread, making you think that it will go in, but it will destroy the threads as you tighten it. \\ | ||
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