how to tell the thread of a bolt.

[weisyboy]

i have a planining head i need to find out the thread of the spindle on it.

can i measure it and work it out?

i dont even know wheather it is imperail or metric.

here are the measurements.

11mm diamiter, 6 threads on the 8mm of thread thats there.

can i work it out form that or is it a mater of going down to the hardware and finding a bolt that fits?

[wheelinround]

Buy a thread gauge Carl :2tsup:

[weisyboy]

where would i buy one of them and what is it?

[DJ’s Timber]

Sounds like it's a 7/16" UNF thread

[weisyboy]

id say its

7/16" - 20 UNF

diamiter - 11,112 mm
pitch - 1,270mm

after some extra carefull measuring wiht my calipers.

my measurements came out to 11mm diamiter and 6 threads over 7.5mm (1.25mm pitch)

thanks dj:U

[blonk]

where would i buy one of them and what is it?

A thread gauge is set of gauges with different thread pitches on them. They look similar to a set of feeler gauges. You would need a set for each type of thread, metric, UNC, UNF, etc. etc. There are combination sets that do some of the most common sizes. They have a variety of thread pitches on them. You open them up, put the gauge against the screw until you find the one that fits neatly in the screws thread. This will tell you what type of thread, and the pitch (Threads Per Inch), then you need to measure the diameter of the screw to determine its size. Simple hey! Certainly easier to show someone than describe the process!
Here is a link to one
http://www2.blackwoods.com.au/infoBANKProduct.aspx?SG=2000165&S=31&G=2004687&P=2028553

Might be easier to go to a fastener specialist and get them to check for you, and tell you exactly what it is. There are a few odd screws out there that will fit each other, but not usually very secure.

[rrich]

Just go to the hardware store and the hardware bins. Find a nut that fits. Not the bin that the nut came from and it should tell you the size and thread pitch.

:D :D :D

[malb]

Many of the Oz hardware stores have nuts and bolts in bins etc, but often they get badly mixed by people who look at parts but don't replace in the correct bin.Some store staff couldn't tell A from B either and put bits in the wrong bin when restocking.

From the info, I run with the UNF suggestion, but make sure that it's not a left hand (reverse rotation) thread.

[Johncs]

i have a planining head i need to find out the thread of the spindle on it.

can i measure it and work it out?

i dont even know wheather it is imperail or metric.

here are the measurements.

11mm diamiter, 6 threads on the 8mm of thread thats there.

can i work it out form that or is it a mater of going down to the hardware and finding a bolt that fits?

Take it down to the nuts and bolts dept in your local Bunny, and see what it fits. Here, they have bolts mounted sticking out to test your nuts, and holes to test your bolts.