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More common hex bolt: 9 mm or 11 mm?

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More common hex bolt: 9 mm or 11 mm?

Old 12-02-14, 12:38 PM
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anga
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More common hex bolt: 9 mm or 11 mm?

Which is a more common size among hex bolts--9 mm or 11 mm?
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Old 12-02-14, 12:43 PM
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common on what? O broadly generalizing one..


8, 9, 10mm combination wrenches are in my tool bag.
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Old 12-02-14, 01:03 PM
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anga
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As used in bicycles.

Which two would you choose from the following 4 combinations?
8/9/10 mm, 8/10/12 mm, 11/13/14 mm, 12/13/14 m

Should I go for 1 and 3 (no 12), 1 and 4 (no 11), 2 and 3 (no 9)?

Last edited by anga; 12-02-14 at 01:09 PM.
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Old 12-02-14, 01:07 PM
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Not sure I've ever seen an 11mm on any of my bikes. 5, 6, 8, 9, 10mm are the common sizes.
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Old 12-02-14, 01:10 PM
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are you talking bolt size or head size? Neither is common. Some of my wrench sets don't include a 9mm wrench.
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Old 12-02-14, 01:15 PM
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till not clear what components are you talking about.

there are hex head, socket Cap screws {aka 'Allen' wrenches L shaped steel hex stock wrench) ,
and Torx fittings used .

+ the hubs on many bikes will need a special thin wrench of 13 and 15 MM + a 17mm on the outside end.
some variations exist ..

There are a rare 11mm , but I forget where I encountered them ,,
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Old 12-02-14, 01:26 PM
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When I google "hex bolt," this is the first image I got.
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Old 12-02-14, 01:47 PM
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Not exactly sure what you are asking. I dont think there is any one common bolt or nut. If its pertaining to bike only then 5,6,,8,9 and 10 as Cross Creek said are the common ones. Hex is short for Hexagon meaning it has six points, weather its a bolt, nut, screw, allen head.
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Old 12-02-14, 02:02 PM
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Originally Posted by anga View Post
Which is a more common size among hex bolts--9 mm or 11 mm?
11 is much more common, sometimes a wrench set doesnt even come with the 9mm
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Old 12-02-14, 02:15 PM
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Originally Posted by fietsbob View Post
There are a rare 11mm , but I forget where I encountered them ,,
M7 hex head cap screws tend to be an 11mm hex. M8 are 12 or 13mm (JIS vs. DIN standard), M6 are 10mm, M5 are 8mm. I don't think I've ever encountered a 9mm hex (bike or auto). If one exists, it's probably on a French bike.
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Old 12-02-14, 02:19 PM
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I'd personally go for 8-10-11 for hex bolts. For allens, I think the most common I see are... 3,4,6? Or maybe 4,5,6?

EDIT: 15mm are also common for pedals and other things on bikes, but you generally need a specific thin wrench to get to those bolts.

Last edited by corrado33; 12-02-14 at 02:27 PM.
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Old 12-02-14, 02:21 PM
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Are you asking about an external hex as shown in anga's posting or a recessed "Allen head" hex socket type? Except for crank fixing bolts which are M8x1.0 threaded and generally have a 14 mm (some are 15 mm) hex cap, that type of bolt is very rare on bikes. Most bolts used on bikes are allen head recessed type and take a hex key to install or remove. For these 3,4,5,6 and 8 mm are the most used sizes.
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Old 12-02-14, 02:47 PM
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Originally Posted by HillRider View Post
Are you asking about an external hex as shown in anga's posting or a recessed "Allen head" hex socket type? Except for crank fixing bolts which are M8x1.0 threaded and generally have a 14 mm (some are 15 mm) hex cap, that type of bolt is very rare on bikes. Most bolts used on bikes are allen head recessed type and take a hex key to install or remove. For these 3,4,5,6 and 8 mm are the most used sizes.
I've come across plenty of rear derailleurs which use a nut (typically sized between 8-10mm) to secure the shift cable...

Oh the irony. As I just said above I've never seen a 9mm hex, well apparently my memory is failing. I went out and checked my wife's mid-2000's Specialized Sirrus with an 8 speed-era Sora RD and it uses a 9mm hex nut for the shift cable.
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Old 12-02-14, 03:33 PM
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The only thing I've ever used a 9 on is a Japanese hose clamp. Pretty much a useless wrench.

For socket head bolts, you can usually throw the 7,9,11 in a box somewhere because you wont use them.
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Old 12-02-14, 04:06 PM
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Originally Posted by Bradleykd View Post
The only thing I've ever used a 9 on is a Japanese hose clamp. Pretty much a useless wrench.

For socket head bolts, you can usually throw the 7,9,11 in a box somewhere because you wont use them.
I had to go out and buy a cheap set with a 7mm allen wrench a few weeks ago because the stem on one of my bikes used one and my set didn't include that size. I replaced the stem with a Nitto, so I probably won't use the wrench again.
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Old 12-02-14, 04:46 PM
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Originally Posted by joejack951 View Post
M7 hex head cap screws tend to be an 11mm hex. M8 are 12 or 13mm (JIS vs. DIN standard), M6 are 10mm, M5 are 8mm. I don't think I've ever encountered a 9mm hex (bike or auto). If one exists, it's probably on a French bike.
The screw and nut of the Mafac centerpull and cantilever brake bridles are both 9mm, so if you need t deal with them, 2 9mm wrenches are needed (or crescent wrenches).

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Old 12-02-14, 04:57 PM
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Originally Posted by RunForTheHills View Post
I had to go out and buy a cheap set with a 7mm allen wrench a few weeks ago because the stem on one of my bikes used one and my set didn't include that size. I replaced the stem with a Nitto, so I probably won't use the wrench again.
Weird. I've worked with metric fasteners my entire career and have never come across a need for a 7, 9, or 11. The only thing I've ever used them for is hammering into a stripped out standard bolt.
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Old 12-02-14, 05:34 PM
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Shimano used 9mm nuts on many of their vintage derailleurs. And 11mm nuts can be found on some sidepull brake pivot bolts.
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Old 12-02-14, 05:45 PM
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Originally Posted by Bradleykd View Post
Weird. I've worked with metric fasteners my entire career and have never come across a need for a 7, 9, or 11. The only thing I've ever used them for is hammering into a stripped out standard bolt.
I can't remember using one before either, but there are a lot of things I can't remember. The brand of the stem is 3TTT and it was made in the 70's.
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Old 12-02-14, 06:26 PM
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8 and 10 are most common on newer bikes;many older bikes use 9 for their derailleurs and sometimes brakes. 15 for nutted axles;a flat one is also good for a pedal wrench.
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Old 12-02-14, 06:48 PM
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Originally Posted by joejack951 View Post
I've come across plenty of rear derailleurs which use a nut (typically sized between 8-10mm) to secure the shift cable...

Oh the irony. As I just said above I've never seen a 9mm hex, well apparently my memory is failing. I went out and checked my wife's mid-2000's Specialized Sirrus with an 8 speed-era Sora RD and it uses a 9mm hex nut for the shift cable.
Yeah, I haven't had to work on one of those lately but I do remember 8 or 9 mm hex nuts on some older and lower line Shimano rear derailleur cable clamps. In fact, I just checked my parts boxes and I still have a Shimano STX rear derailleur that uses a 9 mm nut for the cable clamp.
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Old 12-02-14, 08:13 PM
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Wrenches are like Pokemon - Gotta get them all! (and a couple of some)
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Old 12-02-14, 08:33 PM
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Originally Posted by anga View Post
As used in bicycles.

Which two would you choose from the following 4 combinations?
8/9/10 mm, 8/10/12 mm, 11/13/14 mm, 12/13/14 m

Should I go for 1 and 3 (no 12), 1 and 4 (no 11), 2 and 3 (no 9)?
Get whatever you need for your specific bike.
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Old 12-02-14, 10:28 PM
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7mm headed hex bolts are used on SA 3 spd cable clamp ends. 9mm on various brake and gear bits back in the day. 11mm doubles as a 7/16" wrench but not much else.

With that said I still reach for my 8,9,10mm socket "Y" wrench often enough. Andy.
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Old 12-02-14, 10:47 PM
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Originally Posted by joejack951 View Post
M7 hex head cap screws tend to be an 11mm hex. M8 are 12 or 13mm (JIS vs. DIN standard), M6 are 10mm, M5 are 8mm. I don't think I've ever encountered a 9mm hex (bike or auto). If one exists, it's probably on a French bike.
Bunches of japanese brake bleeders use a 9mm hex. VW (VAG) clutches and flywheels have them. Some mercedes head bolts used them in the dark ages. Lots of truck driveshafts use them. There must be some standard that has 'em....
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