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derailleur set screws

Old 06-03-22, 05:08 PM
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derailleur set screws

At the Bike Exchange we have crates full of used derailleurs,. Everything from early Suntour 7 and Shimano Crane to newer Shimano 105, Ultegra, and Deore that we use when fixing or restoring donated bikes. Yesterday while restoring a Schwinn World Sport I pulled a nice looking Ultegra rear der and installed it only to find that one of the adjustment screws was stuck. Long story short, the only way I could get it to budge was to clamp the head with some needle nose vice grips which ruined it. I went to try to find a replacement only to discover that we had nothing.

So here is my question and request.
Is there a universal standard for these screws?
Where can we order a box of 50 or 100. ?

Also , is it possible to get these with a hex socket head. Often the slot, Philips head is stripped when you look at them in the bin. It seems like a square head or hex socket head would be much better.
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Old 06-03-22, 06:02 PM
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Bill Kapaun
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A JIS Phillips screwdriver will ease some of your problems.
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Old 06-03-22, 07:33 PM
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John Nolan 
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JIS Phillips and penetrating oil usually frees them. I don't have an answer on where to source replacements, or if there's a standard size. You could try getting them from other trashed unit, I guess.
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Old 06-04-22, 12:00 AM
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Originally Posted by Bill Kapaun View Post
A JIS Phillips screwdriver will ease some of your problems.
Do you know what number JIS Philips is typically used on derailleurs?

Thanks
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Old 06-04-22, 12:26 AM
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Originally Posted by capnjonny View Post
At the Bike Exchange we have crates full of used derailleurs,. Everything from early Suntour 7 and Shimano Crane to newer Shimano 105, Ultegra, and Deore that we use when fixing or restoring donated bikes. Yesterday while restoring a Schwinn World Sport I pulled a nice looking Ultegra rear der and installed it only to find that one of the adjustment screws was stuck. Long story short, the only way I could get it to budge was to clamp the head with some needle nose vice grips which ruined it. I went to try to find a replacement only to discover that we had nothing.

So here is my question and request.
Is there a universal standard for these screws?
Where can we order a box of 50 or 100. ?

Also , is it possible to get these with a hex socket head. Often the slot, Philips head is stripped when you look at them in the bin. It seems like a square head or hex socket head would be much better.
I've gotten a couple at Ace Hardware, and Winks Hardware in Portland. It's been ages, but it seems like they were M3x0.5 for olde Shimano and Suntour.

Once you figure out size and length(s) you need, McMaster Carr has socket head bolts in bags. I'd probably just go for the zinc plated steel.
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Old 06-04-22, 03:04 AM
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Suntour Cyclone and VX takes M4 metric fine.

I had a stripped one and retapped it to M5 metric fine.
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Old 06-04-22, 04:46 AM
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Originally Posted by MudPie View Post
Do you know what number JIS Philips is typically used on derailleurs?

Thanks
I use a #1.
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Old 06-04-22, 10:38 PM
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Originally Posted by John Nolan View Post
I use a #1.
Thanks! I didn't realize a JIS screwdriver is the proper tool for the job. I looked at purchasing and saw many available sizes.
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Old 06-05-22, 07:50 AM
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Originally Posted by MudPie View Post
Thanks! I didn't realize a JIS screwdriver is the proper tool for the job. I looked at purchasing and saw many available sizes.
Hozan makes a nice JIS screwdriver set. The large ones work well on bikes, the smaller ones on electronics and cameras. Get the set, you won't regret it.
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Old 06-05-22, 08:04 AM
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Originally Posted by MudPie View Post
Thanks! I didn't realize a JIS screwdriver is the proper tool for the job. I looked at purchasing and saw many available sizes.
I was made aware of these about 20 yrs ago after working on Japanese motorcycles for 30 yrs. and feckering up a few screw heads. The JIS work for all Asian made products (pretty much everything in your house) and really lock into the heads compared with non-JIS tools. There has been a change to try to make one standard and there are some headache inducing articles on this so you may not have to buy stated JIS screwdrivers but I forgot the info and recommend reading up a little if you want to widen the list of JIS compatible tools. Well worth the investment for working on bicycles with their small, not so easy to see well and not always hardened fasteners.
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Old 06-05-22, 08:11 AM
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TIL: the difference between a phillips and a jis phillips
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Old 06-05-22, 12:16 PM
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could swap them out for something similar to these:

https://www.grainger.com/product/6FA...B&gclsrc=aw.ds

https://belmetric.com/m4-stainless-a...13-flat-point/
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Old 06-05-22, 12:38 PM
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Worth checking what the thread is: Suntour Cyclone and VX is 'metric fine' which is M4 x 0.5 mm pitch (metric standard is M4 x 0.7mm pitch).

Metric fine: https://www.fastenerdata.co.uk/fine-thread
Metric standard: https://www.fastenerdata.co.uk/metric-thread

I found some cap bolts that fit my Suntour Cyclone: https://www.ebay.co.uk/itm/384323051054
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Old 06-05-22, 01:18 PM
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Originally Posted by capnjonny View Post
Also , is it possible to get these with a hex socket head.
This or similar ones of a different length.
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Old 06-05-22, 01:54 PM
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https://belmetric.com/m4x0-5-fine-al...13-flat-point/ JIC the other ones are not fine for the standard hardware used.
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Old 06-05-22, 07:59 PM
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From what I have read most crosstip screwdrivers are now coming as JIS compatible so essentially Phillips and JIS are sort of phased out to a more universal crosstip though I use my JIS screwdrivers on everything I have a Hozan and also got the lovely Park Tool DSD 2 and 4 (one is crosstip the other is flat head and I cannot remember which is which number wise). A good set of tools and knowledge on how to use them is really handy.
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Old 06-05-22, 10:31 PM
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Originally Posted by the sci guy View Post
TIL: the difference between a phillips and a jis phillips
TIL what TIL means! ( I had to look this one up.)
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Old 06-07-22, 04:07 PM
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JIS screws

Thanks to Cap'n Jonny and other volunteers' hard work refurbishing bikes, we put this together, hopefully to help other mechanics: https://bikex.org/home/past-articles...rs-don-t-do-it
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