Bolt Dropper T-Nut Wood Insert, Carbon Steel, Black Zinc Finish, 4-Prong 1/4"-20x5/16, Flush Surface Fasteners for Wood, Particle, or Composite Materials Workpiece, Set of 100

I bought some of these in the 1/4 x 20 size to make a custom spoil board for my Shopbot desktop router. I really wanted some without the barbs on the back, but I figured at $10, I'd take a chance. They worked out exactly as I hoped they would. Since these were on the back of the spoil board to provide hold down locations from the top, I took a pair of pliers and easily broke the barbs off as the MDF I use would have never survived those barbs. I then drilled a 3/8 hole in a piece of mild steel and used it as an anvil to flatten the rim of the Tee Nut out.For those who are interested, I used a .800" x .075 counter bore on the back with a central hole through the spill board of .310" diameter. This required tapping them in with a mallet and I used a flat punch to make sure they were seated into the counterbore so they would not contact the machine bed.It's a little more work than buying the brad hole version, but they are insanely cheap. When this spoil board is used up, I intend to just use a 1/4 x 20 bolt to drive them out from the front and reuse them. A great product at a great price. BTW, none had tight or distorted threads, all were free running!My only complaint is I wish they made these with just a round rim for the same price so you didn't have to remove the barbs.

very good products

I was concerned about them working with 1/4 x 20 threads. They are working great. No complaints

They are good quality, but we normally install these with some adhesive to hold them in better. The coating finish doesn't stick well to epoxy or other glues so they didn't hold as well as unfinished ones did.

Excellent low cost solution for levelling shop furniture.

As described and significantly cheaper than my local hardware store.

Worked in azek perfectly

as advertised