Are limit screws JIS instead of Philips?

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08-29-16 | 01:37 PM

#26

Andy_K

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Quote:

Originally Posted by Gresp15C

Philips (and variants) should not be used for screws that adjust something, because you have to push on the screw to make the adjustment. Much better to use an allen head. I understand not wanting to force everybody to adopt a new tool, but those tiny philips heads on derailers and vee-brakes are a weird throwback, when every other screw on the bike has been modernized.

Hear! Hear!

I first became aware of the existence of JIS screws through searching this forum for advice on adjusting a B-screw without stripping the head. I bought a JIS screwdriver and it definitely fits better on both the limit screws and a B-screw, but I still have to take the load off the screws to be able to make adjustments without problems.

I asked a friend for suggestions with the B-screw and he recommended replacing it with a hex-head screw. I believe WolfTooth sells a long B-screw that has this feature, but I don't see any reason that I can't get a screw from the local hardware store to do this.

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08-29-16 | 02:24 PM

#27

Vintage_Cyclist

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The best thing about this thread is that it gives me an excuse to get another tool

08-29-16 | 02:31 PM

#28

corrado33

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Quote:

Originally Posted by Vintage_Cyclist

The best thing about this thread is that it gives me an excuse to get another tool

I beat you to it. My amazon cart is full of different sized JIS screwdrivers.

08-29-16 | 03:31 PM

#29

unterhausen

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From: Happy Valley, Pennsylvania

Quote:

Originally Posted by well biked

It's surprising that, AFAIK, Park doesn't make JIS screwdrivers.

I'm a little surprised by that as well. It wasn't that long ago when getting a JIS #2 was difficult. It's still a little obscure, I bet they would sell a lot of them if they offered it. Lots of people don't know about it. I don't adjust a lot of limit screws, but it's amazing how having the right tool makes it so much better.

08-29-16 | 04:39 PM

#30

Gresp15C

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Quote:

Originally Posted by Andy_K

A typical cap screw may have a head that's too big, but a set screw would certainly fit. You have to make sure the set screw has the correct point, probably round point. For vee brakes, the screws are self threading into plastic, which might be harder to find in a hex head variety. I've seen some sort of blue goop on those screws, to keep them from wiggling loose, so a soft thread locker is probably needed.

08-29-16 | 07:49 PM

#31

superstring

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From: Victoria, BC, Canada

Are JIS screwdrivers designated as +1, +2 etc. instead of #1, #2?

08-29-16 | 09:10 PM

#32

GeneO

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Quote:

Originally Posted by Vintage_Cyclist

The best thing about this thread is that it gives me an excuse to get another tool

08-30-16 | 02:23 AM

#33

onbike 1939

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From: Fife Scotland

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Quote:

Originally Posted by Gresp15C

Philips (and variants) should not be used for screws that adjust something, because you have to push on the screw to make the adjustment. Much better to use an allen head. I understand not wanting to force everybody to adopt a new tool, but those tiny philips heads on derailers and vee-brakes are a weird throwback, when every other screw on the bike has been modernized.

True........I replace my "B" screws with similar Allen-headed one as it makes adjustment easier.

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08-30-16 | 07:10 AM

#34

TimothyH

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Quote:

Originally Posted by superstring

Are JIS screwdrivers designated as +1, +2 etc. instead of #1, #2?

P1, P2, etc.

700/KIT-P123 | Screwdriver Sets | Screwdrivers | Hand Tools | VESSEL TOOLS

Best available IMO.

08-30-16 | 10:25 AM

#35

fietsbob

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Not being OCD, I just do the Work.

08-30-16 | 11:47 AM

#36

superstring

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From: Victoria, BC, Canada

Quote:

Originally Posted by TimothyH

P1, P2, etc.

700/KIT-P123 | Screwdriver Sets | Screwdrivers | Hand Tools | VESSEL TOOLS

Best available IMO.

Hmmm .... so there are 3 designations that mean the same thing? +1, +2 / #1, #2 / P1, P2

08-31-16 | 08:31 AM

#37

speedy25

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Great thread. Thanks to everyone for adding the details. My Craftsman #2 has always worked well for doing adjustments, but I have noticed the not so tight fit that I have with most phillips head slots. Now I know why. Extra thanks for the drawing showing the differences between the two.

Yep, time for some more screwdrivers. I'll tease the snap-on man with that I'm sure he doesnt know about JIS.

-SP

08-31-16 | 08:52 AM

#38

TimothyH

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Quote:

Originally Posted by speedy25

Extra thanks for the drawing showing the differences between the two.

I learned about JIS when I bought an old Honda for my daughter.

Attempting to replace the ignition module to correct an intermittent stall and I found the screw retaining the distributor rotor completely stripped. The previous owner or mechanic butchered it with a Phillips head and the whole distributor had to be removed so the screw could be extracted.

The Vessel screwdrivers previously linked are outstanding quality.

-Tim-

Last edited by TimothyH; 08-31-16 at 08:57 AM.

08-31-16 | 05:27 PM

#39

ltxi

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From: Colorado

Quote:

Originally Posted by speedy25

x2...

09-02-16 | 09:06 AM

#40

loky1179

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From: Minneapolis, MN

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Quote:

Originally Posted by Vintage_Cyclist

I've always found a Phillips to not fit right and honestly didn't know about the JIS standard for this. Learn something new every day here!

And now I know why I have a bunch of goofy looking bits in my drill driver tip kit.

09-02-16 | 10:13 AM

#41

fietsbob

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OK Pozidrive Phillips and now a JIS head are all cross like .. The OP may have to have

someone operating the Tool Room (like I had in a Shipyard) to keep all the tools

and being a Co op, educate each user as to the differences , repeatedly

Just hope the thread of the screws are not all Over the Map..