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D stands for tool diameter.
It is expressed as several times the depth and length of the tool diameter, and is expressed as ○○D.
In drills and end mills, it is expressed as many times as the outer diameter of the tool, and in Tap , it is expressed as several times as the outer diameter of the thre
There are various units that express the properties of metal materials, and it is important to check their numerical values before processing metal materials.
It is also important to select a cutting tool that matches the hardness of the workpiece material.
Among steel materials, the units of materials to be processed by taps and drills include HRC, which represents the hardness of relati
Accuracy class of screws
The grade of the screw is generally determined in the drawing at the time of design of the threaded product.
In order to meet the thread accuracy of the drawing instructions, it must pass the inspection with the thread gauge.
The approximate application is shown in the table, but please check the drawing instructions for
Thread terminology external thread and internal thread Outer diameter Inner diameter Pitch Thread angle
The part shaped like Mt. Fuji is the "screw mountain".
The thread is " external thread " on the outside and " internal thread " on the i
In order for the external thread and internal thread to fit together, the following must be met:
・ internal thread is greater than external thread
・ There is a gap between ★ external thread and
What is the effective diameter of external thread , internal thread ?
What is the effective diameter of external thread ?
Effective diameter: The diameter of an imaginary cylinder such that the width of the thread (B) is equal to the width of the threa
| How to represent the size of a metric thread |
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| A: Screw Type = Metric B: Outer diameter = 10mm C: Pitch = 1.5mm |
The "tolerance" is the difference between the maximum and minimum values of a given dimension.
"Tolerance" is the difference between the limit value allowed for the reference dimension.
The larger one is referred to as the "upper tolerance" and the smaller one is referred to as the "lower tolerance" relative to the reference dimension
