First of all they need not to be case hardened, a lot of the new ones are and are worthless to a knifemaker. I use them a lot and test them by bringing them up to temp and water quench them. I put them in a vise and see if the tail breaks or bends, if they bend they go in the trash.
I buy old ones from Texas Farrier Supply in Mansfield Tx. for $5.00 each. All I've ever bought from them were usable, I recently had a farrier that my brother uses give me 10, all were worthless.
Forgot to mention, I only bring the tail up to temp in a gas forge.
If they will work, I then anneal them and turn a five buck rasp into 5 or 6 hundred bucks.
Last edited by bjankowski; 11/14/21 02:38 AM.