On Monday, April 17, 2017 at 5:50:28 PM UTC-7, AMuzi wrote:
On 4/17/2017 6:19 PM, Doug Landau wrote:
On Friday, April 14, 2017 at 11:11:18 AM UTC-7, Frank Krygowski wrote:
On 4/14/2017 12:33 PM, jbeattie wrote:
On Friday, April 14, 2017 at 7:27:06 AM UTC-7, AMuzi wrote:
On 4/14/2017 9:14 AM, Art Shapiro wrote:
On 4/14/2017 5:35 AM, AMuzi wrote:

Original handlebar clamp bolts are Grade 8; readily
available and cheap.
Grade 5 may be strong enough but for pennies difference I
suggest an 8.

How does one get these "readily available" Grade 8 guys?
Deda doesn't seem to have much of a web presence outside of
Italy. Is this a generic item stocked by a good LBS?


Any metric fastener supplier if not your local hardware store.

https://duckduckgo.com/?q=DIN+912+grade+8&t=ha&ia=web

My neighborhood hardware store has them: http://aboysupply.com/wp-content/upl...1024x415_c.png They have a crazy selection of fasteners.

By the way, what's the deal with thread pitch? I always worry I'm getting the wrong pitch, but I guess that the whole "standard/fine/extra fine" thread pitch only kicks in with fasteners over 8mm(?). Otherwise, it's a pre-set. Right?

No. It's just the charts that only kick in at 8. They are clearly both a)written by someone who doesn't actually know, themselves, and b)plagarising heavily from each other, and repeating the other's mistakes.

There are metric fine pitch threads
https://mdmetric.com/tech/thddat3.htm
like 5mm-0.5 instead of 5mm-0.8

That chart is ****ed up. It says fine but lists more than one thread pitch in the first column, and inconsistently shows extra- and super-fine pitches instead.

The commonly found standard M5 bolt is indeed 0.8 pitch, but the commonly found fine pitch M5 is 0.7. 0.5 must be extra-fine or super-fine. Which is why when you buy a tap and dies set it comes with 5-.8 and 5-.7 but not 5-.5.
I think but am not 100% sure that M6 fine is 0.8 not 0.75.

http://www.sears.com/craftsman-39-pc...g&gclsrc=aw.ds

but I've hardly ever come across them in real life.
No? Are you sure - you've never chased munged up pedal threads? Doing so sends you down to the hardware store for an M10-1.0 tap, because your tap and dies set comes with a 10-1.5 (standard) and 10-1.25 (fine).

There is at least one other place where there is a fine thread, an 8, I think, and I think it's the brake pivot bolt, but am not sure I'm remembering correctly.

What's the thread pitch of derailer hangers?


Pedals are 9/16"-20tpi. The older metric format was m14x1.25
(now abandoned) and there are 1/2"-20 for steel OPC.

Modern gear tabs are m10x1. Campagnolo changed from 10f26
(WW 55deg) in 1999.

Sidepull pivot bolts are mostly m6x1.0 but outliers include
Zeus 2001 with fine m6x0.75. There are (were) others but as
I noted they are outliers.


OK, guess i was rembering derailer hangars
http://www.parktool.com/product/frame-tap-tap-10