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techtalk:ref:tools032 [2022/03/27 03:07] hippysmack [Metric Nut/Bolt Threads] |
techtalk:ref:tools032 [2022/03/27 05:32] 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 are measured for overall length (full outside to outside length). \\ | ||
|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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|**24mm**| |3.00| - | - | | |**24mm**| |3.00| - | - | | ||
- | Metric screw thread OD can be deduced with using an imperial 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. \\ | ||