Hex nuts are the most widely used nuts and will work for most applications. They are standard thickness and can be installed with a wrench or socket set. Machine screw nuts, is a subset of finished hex nuts designed for use with machine screws, which are typically much smaller than bolts. Model # 9074401 Features: Inner Diameter-Thread Size: #12-24 Very common and versatile nut Same in design as a standard hex nut, but smaller to accommodate machine screw sizes Screws onto a machine screw of the same thread size Many times used with a washer with same diameter opening Specifications Met: ASME B 18. 2. 2 & ASME B1. 1 Thread Class: UNC-2B Thread Type: COARSE.
