trailer greaseable bolts

I am looking for trailer spring bolts with grease fitting. I need 5/8" diam by 3" long. I need screw in grease fittings. Would it be hard to make them out of Grade 5 Bolts ? Thanks
 
I have cross drilled bolts before to make greaseable bolts on the idler wheels for my mower decks. You need a darn good drill press and a drilling vice so you can get perfect alignment. You need to drill as slow as possible and CONSTANTLY keep flushing the hole. You cannot let any trash build up in the flutes of the drill. You will hear SNAP!! Then you get to start over again. Be very patient.
 
Google wet bolt. I put some on my trailer awhile back but cant remember the site I ordered them from. ETrailer.com or something like that. Only a couple dollars apiece as I recall.
 
Those bolts are 9/16, not 5/8 and are special bolts. If you allow those bolts to spin in the hangers when taking them out or putting them in the hangers Will be shot and will wear out quickly. I always torch off the nuts and drive the bolts out to prevent that. Then as said the new bolts with knurling will not turn and wear out the hangers.
 
Greasable bolts won't do youmuch good anyway since the bushings are plastic and designed to be clamped between the shackles so the bushing turns in the spring rather than on the bolt. The best way to doa job like that is to buy new bolts, shackles, and bushings and then replace them when they get loose again.
 
These bolts came in very old trailers that had bronze spring bushings. Any trailer supply place worth its salt should at least be able to order them for you. Grade 5 bolts generally are not strong enough for this application, and unless I'm mistaken the "real" ones are case=hardened as well. I'd stick with the real McCoy.
 

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