网页2021/09/20 · The #6 is not the smallest screw, but it is commonly used for putting together small objects. The thread size of the #6 screw is 0.13″ or 9/64 th of an inch in diameter. You can find #6 screws in lengths that range from ½″ up to 1-½″. They are most commonly used for hinges, drawer slides, light-duty fixtures and jigs, toys, and so forth.