Joseph,
Having interviewed and hired people I can assure you that nothing is further than the truth. If you work in a small mom and pop company that simply cant get along without you, you will likely get your raise in the short term. Before the 1st paycheck with the higher salary arrives, I assure you, your replacement is being recruited. In a larger corporation, you can forget your negotiating skills unless you are a top sale rep, top grossing lawyer or accountant who has financial leverage over the company because you can take your book of business elsewhere, you are not scaring anyone. At best you wont get your raise, at worst you will tick off enough people that they will find some pretext to get rid of you and worse the one who shared information they should not have, with you. Im sure you will scream “there are laws” about unlawful firing, well guess what, employment in the USA is what is called “at will”, the same way you can you can give 2 weeks whenever you want to, so can your employer. Dont give them a reason to do so.
Please name a single company that has paid anyone more than their manager because they had better negotiating skills. It is more likely that they know the subordinate is more valuable to the company in the long run, and will almost certainly become the supervisor and prefer to “invest” in that employee.