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Park does JIS, sort of...

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Park does JIS, sort of...

Old 09-17-17, 11:50 AM
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JonathanGennick 
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Park does JIS, sort of...

Ran across this news item today....

Best bike tools at Eurobike 2017 - BikeRadar
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Old 09-17-17, 12:48 PM
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Did not know JIS was different from Phillips. That is why Shimano limit screws are so hard to turn. Anyway, the first thing I do on any Shimano derailleur is to replace the limit screws with 4mm allen head ones.
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Old 09-17-17, 01:13 PM
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Originally Posted by csport View Post
Did not know JIS was different from Phillips. That is why Shimano limit screws are so hard to turn. Anyway, the first thing I do on any Shimano derailleur is to replace the limit screws with 4mm allen head ones.
Interesting. What are the specs? (M4x10mm?)
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Old 09-17-17, 01:59 PM
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After wrenching without the JIS screwdrivers for 40yrs I finally found out about these and bought some a few years ago. So much nicer to work with, they feel like they lock into Japanese and most any Asian screws and no more stripped or chewed up heads . So whatever they're calling this standard now I recommend them.
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Old 09-17-17, 02:39 PM
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Originally Posted by gauvins View Post
Interesting. What are the specs? (M4x10mm?)
I use M4x16mm for the limit screws and M4x10mm for the B-screw. The head is 3mm.
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Old 09-18-17, 09:53 AM
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I've always used a small flat-blade screwdriver for limit screws. Hate trying to use limit screws that have been garfed up by someone's use of a Philips.
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Old 09-18-17, 10:17 AM
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Aren't most modern phillips screwdrivers actually JIS anyway? (Flat tipped)

I made a thread about this subject... years ago and I think that was mainly the consensus.

With that said, I often use flat screwdrivers on limit screws.
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Old 09-18-17, 10:35 AM
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Phillips is not JIS.

A Phillips screwdriver will cam out (strip) the head of a JIS screw.



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Old 09-18-17, 10:58 AM
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I use my Frearson drivers for this. As with JIS, Frearson headed screws are designed to reduce/eliminate camming out.
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Old 09-18-17, 11:15 AM
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Originally Posted by TimothyH View Post
Phillips is not JIS.

A Phillips screwdriver will cam out (strip) the head of a JIS screw.


My philips drivers look like your JIS driver picture above. The actual phillips is what old school phillips screwdrivers look like.
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Old 09-18-17, 11:36 AM
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Originally Posted by ThermionicScott View Post
I've always used a small flat-blade screwdriver for limit screws. Hate trying to use limit screws that have been garfed up by someone's use of a Philips.
Yup, I'm with you. A QUALITY flat bladed screwdriver is the right tool for the job.
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Old 09-18-17, 11:43 AM
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Originally Posted by corrado33 View Post
My philips drivers look like your JIS driver picture above. The actual phillips is what old school phillips screwdrivers look like.
that picture is backwards compared to the diagram and label of the diagram.

i have a custom ground small flat blade for adjusting limit/B screws.... and most limit screws incorporate a flat blade slot anyway.

Last edited by maddog34; 09-18-17 at 11:50 AM.
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