They appear to be zinc plated. Not a bad looking repro item huh?
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I do not know what band clamps you have experience with that have "come loose" but I've been using the Type 316 SS band clamps for over 30 years on a variety of automobiles and have never had one “come loose”. I find that when the clamp needs to be re-tightened it is the result of the hose material yielding to temperature and/or the pressure of the clamp. The cheaper the hose material and construction the more the hose will yield under temperature and the pressure of the clamp requiring a re-tightening of the clamp. This will happen with all clamp styles from wire to band that do not have a constant tension spring (Belleville or T-bolt coil) to compensate for changes in clamping diameter due to temperature and/or pressure.
Yes, Wire Hose Clamps is the correct term for them.you could get these... i bought a bunch and they are pretty cheap and pretty good quality... the ones i could salvage from my truck i got cleaned and re-plated...
Amazon.com: JET wire hose clamps
We ended up getting the clamps from Toyota. Not sure about the comments regarding whether they loosen up or not, but my interest was in keeping it as stock as possible. Thanks for all the input. JMP