Refractory metal screws (bolts,washers, nuts in W, Ta, Mo, Nb) are used under very high temperature and/or corrosive applications.
Other materials are also possible (i.e Titanium, Refractory alloys...)
We offer Tungsten, Tantalum, Molybdenum, Niobium screws, from M2 to M20 for the following types of heads:
as well as metric nuts and washers.
All screws can be offer in vented version.