04-01-2015, 08:55 PM
(04-01-2015, 06:54 PM)EdK Wrote: Not to hijack Willies thread but this is a question about 4140. I recently bought some material from speedymetals.com and got some material from their fire sale which was described as "7/8" Round 4140 HT Cold Roll 46.5" Randoms" so I bought two of them. Once they arrive I realized the "HT" probably meant heat treated. Is this going to be a problem to machine?
Ed
Ed, according to Speedy's spec sheet it has been hardened to 27 to 32 Rockwell C.
I am curious as well about machining it, since I don't have a lot of carbide tooling for my mill.
Quote:4142 CFHT can be used for as wide variety of applications where greater toughness and wear resistance is needed over lower carbon grades. Typical applications include ejectors, back up and support tooling, cams, drill collars, bolts, stubs, couplings, reamer bodies, axles, shafting, piston rods, rams, hydraulic machinery shafts, gears, sprockets, valves, chain links, spindles, tool bodies, tool holders, tie rods, boring bars, machinery parts and components, etc. This material roll threads, knurls, and may be plated.
Grade: 4140
Condition: Heat Treated
Finish: Cold Finished
Willie