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techtalk:ref:tools032 [2022/03/27 07:01] hippysmack [Measuring Threads In General] |
techtalk:ref:tools032 [2024/01/23 01:55] (current) hippysmack |
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| ====== Pitch to TPI Conversion Table ====== | ====== Pitch to TPI Conversion Table ====== | ||
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| The table below is a reprint from THA ((https://traininghandsacademy.com/wp-content/uploads/2020/11/Pitch-mm-to-TPI-inches-Conversion-Table.pdf)) \\ | The table below is a reprint from THA ((https://traininghandsacademy.com/wp-content/uploads/2020/11/Pitch-mm-to-TPI-inches-Conversion-Table.pdf)) \\ | ||
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| ====== US Nut/Bolt Threads ====== | ====== US Nut/Bolt Threads ====== | ||
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| US threads generally have 3 numbers although the last can be left off unless required. \\ | 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 first number is a whole number and/or fraction, the second number is the threads per in (TPI), followed by the length in inches. \\ | ||
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| ====== Metric Nut/Bolt Threads ====== | ====== Metric Nut/Bolt 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. \\ | 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 first number is the diameter, the second the thread pitch, and the third the length in millimeters. ((http://raygirling.com/metthrpt.htm)) \\ | ||
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| |**24mm**| |3.00| - | - | | |**24mm**| |3.00| - | - | | ||
| + | **Methods of measuring in pics**: \\ | ||
| Metric screw thread OD can be deduced by using an imperial (US) scale caliper using the chart above. \\ | Metric screw thread OD can be deduced by using an imperial (US) scale caliper using the chart above. \\ | ||
| Your measurements may not be an exact match to the dims above but will be close enough to make a judgement on the metric counterpart size. \\ | Your measurements may not be an exact match to the dims above but will be close enough to make a judgement on the metric counterpart size. \\ | ||
| - | {{:techtalk:ref:tools:measuring_metric_screw_threads_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ | + | {{:techtalk:ref:tools:measuring_metric_screw_threads_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) {{:techtalk:ref:tools:measuring_screw_pitch_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ |
| ====== Common Brake Line Threads ====== | ====== Common Brake Line Threads ====== | ||
| Most brake systems use flared fittings since they have strong metal to metal connections. \\ | Most brake systems use flared fittings since they have strong metal to metal connections. \\ | ||
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| ====== NPT Pipe Threads ====== | ====== NPT Pipe Threads ====== | ||
| - | NPT stands for National Pipe Thread. Descriptions are commonly used as either straight (NPS) or tapered (NPT). ((DR DICK of the XLFORUM http://xlforum.net/forums/showthread.php?t=1810036&highlight=tap+die&page=2)) \\ | + | NPT stands for National Pipe Thread. Descriptions are commonly used as either straight (NPS) or tapered (NPT). ((DR DICK of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/168660-any-thread-experts-around/page2?t=1810036&highlight=tap+die&page=2)) \\ |
| Pipe thread sizes do not refer to any physical dimension. \\ | Pipe thread sizes do not refer to any physical dimension. \\ | ||
| NPT has flattened peaks and troughs where BSP is rounded. NPT has a thread angle of 60º where BSP is 55º. \\ | NPT has flattened peaks and troughs where BSP is rounded. NPT has a thread angle of 60º where BSP is 55º. \\ | ||
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| ** Little known fact**: \\ | ** Little known fact**: \\ | ||
| - | All iron heads pipe threads used in cases, rocker boxes, and oil pumps are straight female thread, fitted with tapered thread male fittings.((DR DICK of the XLFORUM http://xlforum.net/forums/showthread.php?t=1810036&highlight=tap+die&page=2)) \\ | + | All iron heads pipe threads used in cases, rocker boxes, and oil pumps are straight female thread, fitted with tapered thread male fittings.((DR DICK of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/168660-any-thread-experts-around/page2?t=1810036&highlight=tap+die&page=2)) \\ |
| This holds true for Evo Sportsters also. \\ | This holds true for Evo Sportsters also. \\ | ||
| - | * The sizes in the chart below are the major dia of the male straight thread (as the pipe OD is the major). \\ And the major dia. of a tapered male thread at it's big end. ((DR DICK of the XLFORUM http://xlforum.net/forums/showthread.php?t=1810036&highlight=tap+die&page=2)) | + | * The sizes in the chart below are the major dia of the male straight thread (as the pipe OD is the major). \\ And the major dia. of a tapered male thread at it's big end. ((DR DICK of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/168660-any-thread-experts-around/page2?t=1810036&highlight=tap+die&page=2)) |
| - | * The tapered thread has it's diameter reduced on a taper of .0625" per inch of thread length. Almost all hardware store fittings will be tapered thread.((DR DICK of the XLFORUM http://xlforum.net/forums/showthread.php?t=1810036&highlight=tap+die&page=2)) | + | * The tapered thread has it's diameter reduced on a taper of .0625" per inch of thread length. Almost all hardware store fittings will be tapered thread.((DR DICK of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/168660-any-thread-experts-around/page2?t=1810036&highlight=tap+die&page=2)) |
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