New Arvind Fastners stocks a large inventory of monel bolts, monel nuts, monel flat washers, monel studs, and monel socket head cap screws. Thunder Threads considers Monel 500. Small amounts of titanium and aluminum are added to the nickel-copper base which results in a harder alloy while keeping the similar chemical resistace of monel 500. Common applications for monel 500 are used in pumps, blades, scrapers, collars, instruments, springs, and valves.