These are guaranteed to fit:

Craftsman 5176, 5242, and 391 5180 

Dunlap 5244

Wilton 3.5" Shop King

This listing is for one new chrome lead screw assembly only, not the vises and other lead screw as pictured, those pictures are to demo it fits and is compatible with those models.

These do not have a pin hole or groove as they were made universal for multiple vises out there so you will have to customize to fit your specific application.

These have an acme thread, which I am still researching to determine the exact thread size.

These are good for a light to medium duty homeowner's vise and not intended for a large heavy duty industrial type of vise.

I will not accept returns.  You must determine if these will fit your current needs.  Look at the pictures and decide if this works for you.  There is a .10" gap between the thread if that helps.

This will ship USPS in the most economical way whether that is flat rate envelope, parcel, or first class.