![]() Unlike metric thread here 1" do not means that the major diameter of thread. Thread: Here we say 1" thread as one inch B.S.P thread. ![]() thread, 11 threads per inch and 30.75 mm, from the B.S.P. Let us try to understand this table more deeply using an example. To eliminate accuracy from 0.05 mm to 0.1 mm we round of the value as 6.80. Then, you may ask why M8 and M12 don't follow the formula.įor M8, 8 - 1.25 = 6.75 ~ 6.80. The formula is Major diameter - Pitch.įor M10 bolt major diameter is obviously 10 mm. See the figure below.Ĭ) Drill Size: 8.50 mm is the hole size to be drilled before tapping. For example, M10 x 1.25 and this thread is mainly used for standard cylinders.ī) Pitch: 1.5 pitch means the axial distance between any one of the thread and the next one thread is 1.5 mm. Because there are many pitch sizes in M10 like coarse thread and fine thread. Commonly, we mention the bolt with the pitch size. So we say bolt as M10 bolt and nut as M10 nut. Let's take an example of M10 metric thread, 1.5 pitch and 8.50 mm, from the metric thread table.Ī) Metric thread: As we already stated M10 means Metric thread of 10 mm. Let us understand this table more deeply using an example. DRILL SIZES FOR TAPPING FOR B.S.P THREAD (55⁰ Included Angle) B.S.P. thread table, unlike metric thread TPI (Threads per Inch) means the number of threads cut in one inch.ĭrill size means the hole first to be drilled in the material before tapping. So we say 1/8" thread as one by eight inch B.S.P. thread" means British Standard Pipe thread. In the second table you can find the drill size for B.S.P. DRILL SIZES FOR TAPPING FOR METRIC THREAD (60⁰ Included Angle) Metric Thread You can get some more useful information at the bottom of last table. Here in the metric thread table, Pitch means the axial distance between one thread and the next one thread in mm.ĭrill size means the hole first to be drilled in the material before tapping. In the first table you can find the drill size for metric thread. Here, We have given drill sizes for tapping for metric thread and for B.S.P.
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