JIS screwdrivers

[tigersaw]

Anyone know where to get a set of JIS screwdrivers in the UK?
I want to take the carb apart and rather than cheese up the screws I'd prefer to use the correct tool

[Sid Squid]

No idea, if you find some that aren't utter crap do let us know.

[toxic]

Impact driver and replacement screws work for me.

[yorkie_chris]

No idea, if you find some that aren't utter crap do let us know.

Lol +1

I tend to use PH bits in impact driver (carefully!)

[DarrenSV650S]

What's different about them to normal bits?

[yorkie_chris]

Slightly different shape

[tigersaw]

What's different about them to normal bits?

Philips screws and screwdrivers are designed to 'cam out' if over torqued, protecting the work but mullering the screw. Using a philips screwdriver to unwind a stiff JIS screw will cheese it up for that reason.

[DarrenSV650S]

Ask Ed. He seems to know about the two types of drivers


;)

[embee]

I always worked loosely on the basis that JIS was effectively Phillips with a radius, but reading further like here (http://www.instructables.com/id/When-a-Phillips-is-not-a-Phillips/step10/JIS-Japanese-Industrial-Standard/)it's more the other way round, Phillips is JIS with a taper (though Phillips came along a long time ago, way before JIS). It appears that Phillips is actually designed to cam-out (as Tigersaw says), it was done for early machine assembly with no mechanical torque control. JIS (and Pozidrive) have parallel sides and don't cam-out as easily, auto assembly uses torque control.

Having read all that, I use good quality Phillips bits in JIS screws with very few issues usually, the problems get much worse as the bits wear and get more taper on them. Pozidrive doesn't fit at all (they're the ones with the extra notches in the inner corners of the recess, angles are all different and they just don't match Phillips or JIS).

[beabert]

Well you learn something everyday! i want some now, assuming there are jis screws on the SV :D

[beabert]

Are the ones in the toolkit JIS?

[Spanner Man]

Good morning all.


I came across these type of screws donkeys years ago, whilst working for Snap-On flogging tools to industry.
Snap-On had just bought out what they call ACR bits for their multiple tip magnetic screwdrivers. These tips are serrated, these worked extremely well on JIS screws.

I don't own any JIS screwdrivers. I use ACR bits for all Phillips number 2, & 3 applications, & have yet to have a problem. If it wont come undone due to a seized thread, an ACR bit will grip hard enough to snap the head off should I wish to.


Cheers.