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SKU:79097050
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.
Size 3/8 inch-16
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
Often used with a washer with same diameter opening
Thread Type Coarse, Thread Class UNC-2B
Specification(s) Met ASME B 18.2.2 and ASME B1.1
I use these in my plumbing business . Good quality and work very well .