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Straight screws generally refer to parallel threads.
For example, if you order from a customer and specify only "1/4 straight thread", the thread cannot be identified.
Also, since the size of 1/4 is expressed in inches, the candidates can be narrowed down to some extent, but not specified.
An example of a straight screw in inch notation
・Unify
・ whitworth screw
・Parallel screws for pipes (parallel internal thread RP for tight coupling, parallel screws G and PF for mechanical coupling)
etc
It is also necessary to specify the pitch and thread accuracy.
When processing the screw, it is also necessary to check the machining content and the workpiece material.
To select the one that meets the user's needs, check the missing information.