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In general, straight screws often refer to parallel screws.
For example, if you specify only "1/4 straight thread" in an order from a customer, the screw cannot be identified.
In addition, since the size of 1/4 is expressed in inches, candidates can be narrowed down to some extent, but it is not specified.
An example of a straight screw in inch notation
・Unified
・Wit
・Parallel screws for pipes (parallel internal thread rp for tight bonding, parallel screws G and PF for mechanical coupling)
etc
You will also need to specify the pitch and thread accuracy.
When machining the screw, it is also necessary to check the machining content and workpiece material.
In order to select the one that meets the user's needs, let's check the missing information.