Author Topic: os 25 back plate bolts (Read 3256 times)

Bootlegger · « **on:** February 20, 2014, 11:44:04 AM »

Where can I get some that are allen socket instead of the phillips head? Thanks

Brett Buck · « **Reply #1 on:** February 20, 2014, 01:31:36 PM »

Quote from: Bootlegger on February 20, 2014, 11:44:04 AM

Where can I get some that are allen socket instead of the phillips head? Thanks

I think they are standard metric sizes, so just about anywhere like a good hardware store.

If you are having problems with the original screws, get some JIS standard "phillips head" screwdrivers. They fit perfectly and are more secure than Allen heads.

I would also caution against over-tightening the backplate screws on the plastic backplates. They need to be snug but not cranked down to the limit - if you do over-tighten them, it will crack at the corners, and also, distort the backplate and cause it to leak. Just snug enough and it seems to be fine, even with no gasket.

Brett

Paul Gittel · « **Reply #2 on:** February 20, 2014, 01:49:38 PM »

Here's a link to a place that sells hardware that you might find useful.

http://www.fastener-express.com/socket-screws.aspx

Gerald Arana · « **Reply #3 on:** February 20, 2014, 02:00:39 PM »

Bootlegger,

I get mine from microfasteners. Service is fast.

Go to www(dot)microfasteners(dot)com and see their catalogue.

Jerry

Tim Wescott · « **Reply #4 on:** February 20, 2014, 02:16:19 PM »

Quote from: Brett Buck on February 20, 2014, 01:31:36 PM

If you are having problems with the original screws, get some JIS standard "phillips head" screwdrivers. They fit perfectly and are more secure than Allen heads.

Anal-retentive mechanical types call them "cross-head" screws. They really only work right if the driver fits the screw correctly*, and there's a bazzilion different standards (including Phillips').

I'm not sure if I agree with Brett about cross-head screws working better than socket-head** screws, but with exactly the right driver they'll work a whole lot better than without. (Brett, have you been using ball-end drivers or something? Ball-end drivers are a good tool for ruining socket-head screws, and should never be used to torque one down -- just to spin them into place prior to using a real wrench to finish the job. Unless, of course, the screw is cross-drilled for safety wire, in which case a ball-end driver is just a handy way to strip out the inside of the screw head.)

* This is true of plain slotted screws, too -- get a driver that fits the width of the slot perfectly, or even fairly close, and you'll never bung up that screw again.

** "Allen" is a brand name of a kind of hex key, but hasn't been the trade name for a long time.

Brett Buck · « **Reply #5 on:** February 20, 2014, 03:43:35 PM »

Quote from: Tim Wescott on February 20, 2014, 02:16:19 PM

Anal-retentive mechanical types call them "cross-head" screws. They really only work right if the driver fits the screw correctly*, and there's a bazzilion different standards (including Phillips').

I'm not sure if I agree with Brett about cross-head screws working better than socket-head** screws, but with exactly the right driver they'll work a whole lot better than without. (Brett, have you been using ball-end drivers or something? Ball-end drivers are a good tool for ruining socket-head screws, and should never be used to torque one down -- just to spin them into place prior to using a real wrench to finish the job. Unless, of course, the screw is cross-drilled for safety wire, in which case a ball-end driver is just a handy way to strip out the inside of the screw head.)
** "Allen" is a brand name of a kind of hex key, but hasn't been the trade name for a long time.

   (big sigh). Yes, I know what different screwdrivers do and are used for. Given that I was communicating to a general audience, and not wanting to spend a half an hour explaining different standards, I used the vernacular.

   And, specifically for this particular case, I did in fact use JIS Cross-head screwdrivers from Hozan in the actual screws used for the 25LA backplate about 8 hours ago. You can put the screwdriver in the head, and hold the thing horizontally just counting on the blade tightness in the groove to hold it. It fits far better than the correct-size Allen (or other brand) hex key does in a similar -sized socket-head screw. "allen wrench" is indeed the trade name for such a hex key.

   Sorry for any confusion .

   Brett

p.s. I tested and the Hozan #1 JIS driver is the right one for the screws on the 25LA. As always, the largest driver that will fit is the correct one. These drivers fit the screws so perfectly, I am pretty sure that I could break the head off the screw before the driver comes out of the "slot".

Don Hutchinson AMA5402 · « **Reply #6 on:** February 20, 2014, 04:48:26 PM »

A decent Ace hardware store will have what you want. Take the engine with you and find the right size.

Bootlegger · « **Reply #7 on:** February 20, 2014, 05:17:18 PM »

Thank y'all fellows I sure do 'ppreiate the info.. Let's "Geaux racin' boys"... Darrel Waltrip quote...

Allan Perret · « **Reply #8 on:** February 20, 2014, 05:37:08 PM »

Your local hobby shop. They have all those metric sizes for the RC cars.

Curare · « **Reply #9 on:** February 20, 2014, 09:14:06 PM »

Ahh the old JIS driver debacle. I went to every tool shop in an hour radius of my home and every time I asked for a JIS driver they looked at me like I was speaking swahili.

BUT! here's a secret: If you have a japanese car (like a toyota or subaru) the screwdriver in the little supplied toolkit is JIS.

With that said, I usually throw out the JIS screws and go for M3 button head cap screws. You just need to make sure that the flange area is not too large or they wont fit into the recesses in the head, a quick check against your existing JIS screws will tell you whether or not you're going to have problems.

Brett Buck · « **Reply #10 on:** February 20, 2014, 10:51:10 PM »

Quote from: Curare on February 20, 2014, 09:14:06 PM

Ahh the old JIS driver debacle. I went to every tool shop in an hour radius of my home and every time I asked for a JIS driver they looked at me like I was speaking swahili.

http://www.centralhobbies.com/Tools/jis.html

Brett

Bootlegger · « **Reply #11 on:** February 21, 2014, 06:34:05 AM »

Next question, does anybody know the size (dia) and pitch? Again thanks

Gerald Arana · « **Reply #12 on:** February 21, 2014, 09:48:04 AM »

M2.6X8, according to the owner's manual.

Allan Perret · « **Reply #13 on:** February 21, 2014, 10:03:00 AM »

Quote from: Curare on February 20, 2014, 09:14:06 PM

With that said, I usually throw out the JIS screws and go for M3 button head cap screws. You just need to make sure that the flange area is not too large or they wont fit into the recesses in the head, a quick check against your existing JIS screws will tell you whether or not you're going to have problems.

Button head ?? Not the best choice, especially for a cylinder head application. For any given screw size a button head will take a smaller driver, and you may not be able to get it properly torqued. Socket heads are better, they take a larger driver, and head is same diameter as the JIS you are replacing so there is no issue of fitting into the head's recess.

Bootlegger · « **Reply #14 on:** February 21, 2014, 11:35:46 AM »

Got it done, thanks a lot..

Steve Helmick · « **Reply #15 on:** February 24, 2014, 06:53:03 PM »

I looked up the OS .25LA manual online, and indeed, it does say 2.6m x 8mm (the 8mm is length), and no mention is made of the pitch. It also says the muffler screws are 2.6m, but I forget what the length callout is.

I also looked at my handy Starrett thread/drill card to see what standard metric thread sizes are. It says 2.5m x .45mm pitch; there is also a 2.2m x .45mm pitch, but no such thing as a 2.6m thread. I don't really know what to think about this, but wonder if the 2.6m is just plain wrong. I know the .25LA uses 3m x .5mm head screws, and it may use 3m x .5mm muffler screws also...but I'm not looking at one right now, and need to get dinner started ASAP...

Steve

Brett Buck · « **Reply #16 on:** February 24, 2014, 09:03:38 PM »

Quote from: Steve Helmick on February 24, 2014, 06:53:03 PM

I looked up the OS .25LA manual online, and indeed, it does say 2.6m x 8mm (the 8mm is length), and no mention is made of the pitch. It also says the muffler screws are 2.6m, but I forget what the length callout is.

I also looked at my handy Starrett thread/drill card to see what standard metric thread sizes are. It says 2.5m x .45mm pitch; there is also a 2.2m x .45mm pitch, but no such thing as a 2.6m thread. I don't really know what to think about this, but wonder if the 2.6m is just plain wrong. I know the .25LA uses 3m x .5mm head screws, and it may use 3m x .5mm muffler screws also...but I'm not looking at one right now, and need to get dinner started ASAP... Steve

http://www.amazon.com/Kyosho-1-S22610-SCREW-M2-6X10-5PCS/dp/B003VZMRXE/ref=sr_1_14?ie=UTF8&qid=1393300681&sr=8-14&keywords=M2.6+screw+socket+cap

But, I emphasize again, the standard screws are just fine if you have a proper screwdriver and you certainly DO NOT want to crank down on them hard regardless of the head.

Brett

Akihiro Danjo · « **Reply #17 on:** February 25, 2014, 10:55:50 AM »

Quote from: Bootlegger on February 20, 2014, 11:44:04 AM

Where can I get some that are allen socket instead of the phillips head? Thanks

Is your OS25 FP/LA or old Max25S ?
It is difficult to get the screws for Max-S series even here in Japan.

Aki

Dallas Hanna · « **Reply #18 on:** February 26, 2014, 01:39:17 AM »

Quote from: Steve Helmick on February 24, 2014, 06:53:03 PM

I looked up the OS .25LA manual online, and indeed, it does say 2.6m x 8mm (the 8mm is length), and no mention is made of the pitch. It also says the muffler screws are 2.6m, but I forget what the length callout is.

I also looked at my handy Starrett thread/drill card to see what standard metric thread sizes are. It says 2.5m x .45mm pitch; there is also a 2.2m x .45mm pitch, but no such thing as a 2.6m thread. I don't really know what to think about this, but wonder if the 2.6m is just plain wrong. I know the .25LA uses 3m x .5mm head screws, and it may use 3m x .5mm muffler screws also...but I'm not looking at one right now, and need to get dinner started ASAP... Steve

Look here Steve : http://mdmetric.com/tech/tict.htm

M2.6 x 0.45 is indeed a standard metric thread from the DIN Standard.

HH

Timothy Payne · « **Reply #19 on:** February 26, 2014, 01:45:25 AM »

Modelfixings.co.uk - They stock all the UNC stuff (inc. hexbolts and hexkeys) and provide good service.

Tim