[IH8Rice]

I just got a great sponsorship deal from TekBolt Hardware and was curious to the sizing on bolts.


bolt sizes like M5 or M6 mean Metric 5mm diameter or Metric 6mm diameter right?
and are the lengths measuring the total length of the bolt including the head or just the threaded portion.

my vernier caliper just broke so i cant accurately measure the bolts im replacing...which could help


grazie!

 

[Dazed]

An M6x25 has a nominal length of 25mm, for instance. Note that this is not the same as the thread length. The whole shaft does is not always threaded.

 

[IH8Rice]

An M6x25 has a nominal length of 25mm, for instance. Note that this is not the same as the thread length. The whole shaft does is not always threaded.

so basically its the length of the shaft itself then?

 

[jonKranked]

so basically its the length of the shaft itself then?

you got it chief.

 

[w00dy]

example:

M6x1x25
6mm threaded diameter
1mm pitch (spacing between threads, not like US where it's threads per inch)
25mm nominal length

 

[davep]

Except for flat heads....in which case, the length includes the head as well.

 

[IH8Rice]

Except for flat heads....in which case, the length includes the head as well.

but in the case on 99.999% of the bolts found on a bike, it doesnt right?

 

[w00dy]

Correct, most bolts on a bike are socket head cap screws, such as the one pictured.

 

[jinshiyang]

thread insert helicoil

 

[motostu93]

are most metric bolts on bike the same pitch?

 

[zebrahum]

are most metric bolts on bike the same pitch?

No, it usually depends on the size of the particular bolt. From 10mm x 1 to 9/16" x 20tpi. The most common thread pitch is 1mm as far as I know.

 

[wood booger]

No, it usually depends on the size of the particular bolt. From 10mm x 1 to 9/16" x 20tpi. The most common thread pitch is 1mm as far as I know.

Dependent on size

M6X1
M5X0.8
M4X0.7
M8X1.25

Are the common pitches for these sizes.

Sometimes larger bolts w/ a finer pitch (0.75) are used for suspension linkage.

 

[IH8Rice]

can loctite be used on Ti bolts or is it a bad idea?

 

[JRogers]

I am unsure because I do not use ti bolts, but I think it depends on the application. Suspension bolts that might loosen have little chance of seizing up and may need loctite. Something like a stem bolt might not be loosened for a while and could corrode, so anti-seize might be better for those. I think either will protect against corrosion to some degree, but I'd get some anti-seize to use as default and use loctite if it's necessary.

 

[IH8Rice]

i was thinking about anti seize too, but wasnt sure if loctite would be a better option

 

[IH8Rice]

got an answer from Tekbolt

It's usually best for the threads to use one or the other. Threads last much, much longer with anti-sieze than when they are bare, but loctite also provides a small amount of lubrication. In general, use loctite if you need extra insurance in keeping a particular bolt tight, otherwise use anti-sieze.

TekBolt
bgill@tekbolt.com
www.tekbolt.com
Ph: 920-954-8660
Fax: 561-423-6326

1604-C W Haskel St
Appleton, WI 54914