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Old 01-15-14, 09:37 PM   #1
jgscisum 
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Shimano Deore Dx rear Derailleur. I screwed up.

OK...... Right up front....... I screwed up. I purchased a Deore DX M650 rear derailleur on the auction site and did not notice it did not have the capture nut that secures the cable. I know, I know.... not smart. Does any one have one or know the size of the threaded stud it goes on. Of all the parts I've collected over 40 years I can't find one that works and can't find a parts diagram on the web. Please take it as easy as you can on your comments. I already feel like a DA. Thanks in advance for any help or info. Js
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Old 01-15-14, 09:58 PM   #2
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Hmmm... I want to say M4, but I dunno. The stud & nut are particular to Shimano- maybe there's a bike shop near you with a box of beat-up Shimano derailleurs you can strip?
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Old 01-15-14, 10:59 PM   #3
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looking at online pics of the Deore DX M650, it looks like 'the usual' m5 flat head carriage bolt that shimano uses on... well everything.

see the bolt in center?
http://www.bikepartsplace.com/discou...e-anchor-bolt/

then probably an ordinary washer will do to pinch cable (dunno if one in pic left is right for old DX)

key point is that carriage bolt
can even pull it out of a tourney front or rear derailer...very common part
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Old 01-15-14, 10:59 PM   #4
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Shimano tended to use the same basic design of anchor bolts over a number of models and years of ders. Bring yours to the LBS and paw through their used bins. Andy.
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Old 01-16-14, 03:31 AM   #5
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Most bike co-ops will have a fixing nut lying around for free... In particular if you can salvage it off a busted derailer. Also it probably had a small circular washer underneath that had a groove in it to avoid deforming the cable. Might be worth checking out, I can't remember for that particular model.
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Old 01-16-14, 07:05 AM   #6
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Thanks everyone! The washer is there just no nut. I wish the guy had listed it as parts only. Our bike shop does have a parts bin I can go through. Believe it or not we have a store called "The House of a Million Screws" I'll see if they have a M5? nut that may work. Thanks again! Joe
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Old 01-16-14, 09:09 AM   #7
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Bikes are full of M5 fittings, like water bottle mounts or fender mounts. It seems to me that if the anchor bolt is still in place and only a nut is needed one might be able to thread the bolt into a known fitting on the frame to confirm. FWIW I think the anchor bolt is a M5 too. Andy.
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Old 01-16-14, 11:56 AM   #8
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Originally Posted by Andrew R Stewart View Post
FWIW I think the anchor bolt is a M5 too. Andy.
I just checked the cable anchor bolt on a older Shimano STX rear derailleur and it certainly is M5x.8 mm threaded. Any decent hardware store or home center that has any amount of metric fasteners will have nuts with that thread.

Shimano and Campy provide a hybrid OEM nut that is female threaded M5x.8 for the bolt on one face and the other side has a 5 mm Allen recess. It's convenient but an ordinary M5 hex nut will substitute just fine.
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Old 01-16-14, 01:40 PM   #9
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Do yourself a favor and get an "elastic stop nut". The nylon insert will help keep the nut from loosening. Most hardware stores and other places with a hardware assortment will have them.
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Old 01-16-14, 05:25 PM   #10
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Shimano tended to use the same basic design of anchor bolts over a number of models and years of ders. Bring yours to the LBS and paw through their used bins. Andy.
Best advice I've heard. Don't skip the washer though. Good luck
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Old 01-17-14, 10:43 AM   #11
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Got it!

OK............... color me stupid again! The M5 is correct. Tried a couple of M5 and couldn't get it to start on the thread. Finally looked at the stud real close and there was a nub/burr at the beginning. After carefully filling it down with an emory board it threaded right on and clamps fine. Sometimes you just can't see the forest for the trees. I need to re-think my thought process from time to time and look for the simplest most obvious cause. GREAT forum and GREAT members willing to help.
THANKS TO ALL!
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