Q: Why is Monel expensive?
A: Monel is a nickel alloy. Nickel alloys in general can be expensive due to their high level of nickel content. In general Monel 400 bolts will be more economic and readily available than K500 bolts. Monel K500 is more costly than grade 400 because it must go through an additional age hardening process which gives K500 bolts the extra strength – double that of grade 400.