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techtalk:ref:tools032 [2022/03/27 07:38] – [Metric Nut/Bolt Threads] hippysmacktechtalk: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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 {{: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)) \\ {{: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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