Drill chuck internal thread...what size???

[nickjaxe]

Hi...I have been given a nice SDS drill...I have few SDS type drill bits but think its possible to buy a convert to a std type chuck accept ordinary drill bits.

I have several chucks that are quite some years old...prob from the 1980s they take upto 13mm bits and are Jacobs type make.

The internal thread on these chucks is approx 11.25mm across...not an accurate measurement and they have a fine thread...no idea if metric or imperial.

Whats the best way to find out what thread they are...I dont have much in the way of thread tools bar a tread gauge thats in with a box of metric taps.

Nick.

 

[eLuSiVeMiTe]

Just buy a SDS chuck.

https://www.google.co.uk/search?q=s...ndroid-google&sourceid=chrome-mobile&ie=UTF-8

 

[Parm]

I bought a keyless chuck and the bit at the back that fits and suds chuck, think it was from tool station or screw fix. A very hand accessory to have if your drill has hammer stop

https://www.screwfix.com/p/dewalt-dt7046-qz-keyless-chuck-13mm/50008

https://www.screwfix.com/p/bosch-sds-plus-13mm-chuck-adaptor/80892

The bottom one shows the adaptor, I bought it seperately

 

[MBB]

Jacobs drlll chucks for hand drills were 3/8 unf

 

[David2002]

1/2" / 13mm chucks usually 1/2" x 20 thread

 

[MBB]

1/2" / 13mm chucks usually 1/2" x 20 thread

1/2 X 20 IS A UNF THREAD

 

[nickjaxe]

Many thanks guys...yes I will get a combined chuck and adaptor...makes more sense.

 

[graffian]

I have a Jacobs chuck with a funny fluted straight shank on it I guess that is SDS?
It's a 1/2x20 thread, it's engraved on the body.

 

[nickjaxe]

Thanks for the tip...turn the hammer off...does that apply to all basic chucks re hammer setting.