Differences
This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision | ||
techtalk:ref:tools032 [2022/03/27 05:32] hippysmack [Measuring Threads In General] |
techtalk:ref:tools032 [2024/01/23 01:55] (current) hippysmack |
||
---|---|---|---|
Line 30: | Line 30: | ||
Length is measured from the very end of a bolt/screw to where the fastened surface is assumed to be. \\ | 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. \\ | Panhead screws / hex bolts / cap screws etc. are measured from under the head to the end. \\ | ||
- | Flat head screws are measured for overall length (full outside to outside length). \\ | + | 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.| | ||
Line 50: | Line 53: | ||
====== 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)) \\ | ||
Line 70: | Line 72: | ||
====== 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. \\ | ||
Line 97: | Line 98: | ||
====== 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)) \\ | ||
Line 120: | Line 120: | ||
|**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. \\ | ||
Line 151: | Line 153: | ||
====== 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. \\ | ||
Line 164: | Line 166: | ||
** 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|}}|||| |