Hex Finish Nuts – Plain Grade 8 Alloy Steel – Sizes 1/4″-20 through 2-1/2″-4. Grade 8 Alloy Steel. UNC Coarse & UNF Fine. Plain Grade 8 Steel Hex Nuts. Finish Nuts in Grade 8 Steel Alloy. Available in coarse thread & fine threading. Grade 8 Steel with No Finish (Plain). Hex nuts are used for many fastening applications. These nuts are often used with screws and bolts when mechanically joining materials together. If the size of the screw that you are using is smaller than 1/4-20 (ex 8-32 or 10-24) you should be using and searching for hex machine screw nuts. Finished Hex nuts start at size 1/4-20. To “go green” and reduce our use of plastic all product quantities will be packaged in as few packages as possible. Listing photo is generic for the fastener type listed in this listing and is not to scale. Please refer to the description for fastener details. We will respond with the requested information quickly.