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techtalk:ref:tools032 [2021/08/28 01:53] hippysmack |
techtalk:ref:tools032 [2022/03/27 07:01] hippysmack [Measuring Threads In General] |
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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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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| - | - | | ||
+ | |||
+ | 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)) \\ | ||
====== 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. \\ |