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techtalk:ref:tools032 [2021/08/28 01:53] hippysmack |
techtalk:ref:tools032 [2024/01/23 01:55] (current) hippysmack |
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| ====== Measuring Threads In General ====== | ====== Measuring Threads In General ====== | ||
| + | **Thread TPI or Pitch**: \\ | ||
| You can purchase a cheap template with different size threads to size screws/bolts or go by your local hardware store to use theirs. \\ | You can purchase a cheap template with different size threads to size screws/bolts or go by your local hardware store to use theirs. \\ | ||
| But you don't really need one to accurately find the size of most bolts or thread patterns. \\ | But you don't really need one to accurately find the size of most bolts or thread patterns. \\ | ||
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| You can buy tap/drill and metric conversion charts pretty cheap online or at some bolt or hardware stores. \\ | You can buy tap/drill and metric conversion charts pretty cheap online or at some bolt or hardware stores. \\ | ||
| - | Then hang them up in your shop where you can always find them when needed. \\ | + | Then hang them up in your shop where you can always find them when needed. \\ |
| + | |||
| + | **Bolt/Screw Length**: \\ | ||
| + | Length is measured from the very end of a bolt/screw to where the fastened surface is assumed to be. \\ | ||
| + | Panhead screws / hex bolts / cap screws etc. are measured from under the head to the end. \\ | ||
| + | Flat head screws, tapered shanks under the head, are measured for overall end to end length (head is assumed to end flush with fastened piece). \\ | ||
| + | |||
| + | | Measuring length ((composite of photos used with permission)) | | ||
| + | |{{:techtalk:ref:tools:measuring_different_type_bolts_or_screws.jpg?direct&300|}}| | ||
| |SAE thread gauge: ((photos by Hippysmack))||Tap/drill and metric conversion charts.| | |SAE thread gauge: ((photos by Hippysmack))||Tap/drill and metric conversion charts.| | ||
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| ====== Pitch to TPI Conversion Table ====== | ====== Pitch to TPI Conversion Table ====== | ||
| - | |||
| 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 ====== | ||
| - | |||
| 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 ====== | ||
| - | |||
| 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)) \\ | ||
| The diameter is the outside diameter of the thread peaks. \\ | The diameter is the outside diameter of the thread peaks. \\ | ||
| - | 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. \\ | + | In 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. \\ |
| - | ^{{techtalk:miscres:instruction_sheet_header_4.png?nolink&600|}}|||| | + | |
| - | | Metric Thread Pitch |||| | + | ^{{techtalk:miscres:instruction_sheet_header_4.png?nolink&600|}}||||| |
| - | |Bolt Diameter|Standard Thread Pitch (mm)|Fine Thread Pitch (mm)|Extra Fine Thread Pitch (mm)| | + | | Metric Thread Pitch ||||| |
| - | |**4mm**|0.70| - | - | | + | |Thread OD \\ Metric|Thread OD \\ Inches (app)|Standard \\ Pitch (mm)|Fine \\ Pitch (mm)|Extra Fine \\ Pitch (mm)| |
| - | |**5mm**|0.80| - | - | | + | |**4mm**|0.157"|0.70| - | - | |
| - | |**6mm**|1.00| - | - | | + | |**5mm**|0.197"|0.80| - | - | |
| - | |**7mm**|1.00| - | - | | + | |**6mm**|0.236"|1.00| - | - | |
| - | |**8mm**|1.25| 1.00 | - | | + | |**7mm**|0.275"|1.00| - | - | |
| - | |**10mm**|1.50| 1.25 | 1.00 | | + | |**8mm**|0.315"|1.25| 1.00 | - | |
| - | |**12mm**|1.75| 1.50 | 1.25 | | + | |**10mm**|0.394"|1.50| 1.25 | 1.00 | |
| - | |**14mm**|2.00| 1.50 | - | | + | |**12mm**|0.472"|1.75| 1.50 | 1.25 | |
| - | |**16mm**|2.00| - | - | | + | |**14mm**|0.551"|2.00| 1.50 | - | |
| - | |**18mm**|2.50| - | - | | + | |**16mm**|0.630"|2.00| - | - | |
| - | |**20mm**|2.50| - | - | | + | |**18mm**|0.708"|2.50| - | - | |
| - | |**24mm**|3.00| - | - | | + | |**20mm**|0.787|2.50| - | - | |
| + | |**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. \\ | ||
| + | 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_screw_pitch_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ | ||
| ====== Common Brake Line Threads ====== | ====== Common Brake Line Threads ====== | ||
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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)) |
| ^{{techtalk:miscres:instruction_sheet_header_4.png?nolink&600|}}|||| | ^{{techtalk:miscres:instruction_sheet_header_4.png?nolink&600|}}|||| | ||
