Rethread the cylinder barrell

pierodn · Apr 11, 2015

Please,
I need to rethread the cylinder barrels for fix the head studs.
What is the correct thread for standard stud?
Thank you.
Piero

L.A.B. · Apr 11, 2015

5/16" - 26 TPI BSC.

http://www.britishfasteners.com/threads/bsc.html

pierodn · Apr 11, 2015

Thank you Les.
I bought a set of taps, 5/16 too, in the British thread pattern i know as "cycle" or 26 tpi.
But i cant understand if the taps are BSC or BSF or ...!
http://www.ebay.it/itm/261822749522?ssP ... 1439.l2649
Ciao
Piero

Peter R · Apr 12, 2015

Piero, 5/16 cycle thread (BSC), has 26 tpi (turns per inch).
5/16 BSF (British standard fine), has 22 tpi .
It is usefull to buy yourself a threadgauge, to identify the different threads.

pierodn · Apr 16, 2015

L.A.B. said:
5/16" - 26 TPI BSC.

http://www.britishfasteners.com/threads/bsc.html

Hi Les.
For bring a Atlas barrells to a Commando head studs sze, using a 5/16 - 26 TPI BSC tap, what measure of drill should i use?.
Thank you.
Piero

L.A.B. · Apr 16, 2015

pierodn said:
using a 5/16 - 26 TPI BSC tap, what measure of drill should i use?.

http://www.britishfasteners.com/threads/bsc.html

Tapping Drill Size......

......5/16..........

Letter Drill J
0.2756 inch
7 mm

This table says: 7.2mm
http://www.tap-die.com/contents/en-uk/d ... Sizes.html

pierodn · Apr 16, 2015

L.A.B. said:
pierodn said:

using a 5/16 - 26 TPI BSC tap, what measure of drill should i use?.

Click to expand...

http://www.britishfasteners.com/threads/bsc.html

Tapping Drill Size......

......5/16..........

Letter Drill J
0.2756 inch
7 mm

Click to expand...

This table says: 7.2mm
http://www.tap-die.com/contents/en-uk/d ... Sizes.html

Hi Les,
Thank you.
Ciao
Piero

pierodn · Apr 22, 2015

Hi Les,
Please, to day arrived fom USA a 5/16 BSC tap.
It is smaller than the barrells thread hole for head stud.
What i have wrong.
Thank you.
Piero

L.A.B. · Apr 22, 2015

pierodn said:
Please, to day arrived fom USA a 5/16 BSC tap.
It is smaller than the barrells thread hole for head stud.
What i have wrong.

Originally, you said: "I need to rethread the cylinder barrels for fix the head studs."

The two (067561) "head studs" that screw into the front of the barrel are 5/16", however the (060401) head bolts (and thus the threads for the head bolts in the barrel) are 3/8" (x 26 BSC) but you didn't mention the head bolts.

pierodn · Apr 22, 2015

Hi Les,
Sorry for my previous wrong explanation.
Very well, i have the 3/8 BSC too.
Please Les, what drill i will need for the Atlas barrells to 3/8 studs?

Thank you.
Piero

L.A.B. · Apr 22, 2015

pierodn said:
what drill i will need for the Atlas barrells to 3/8 studs?

3/8 Bolts?

http://www.britishfasteners.com/threads/bsc.html
http://www.tap-die.com/contents/en-uk/d ... Sizes.html

= 8.65 - 8.7mm.

pierodn · Apr 22, 2015

L.A.B. said:
pierodn said:

what drill i will need for the Atlas barrells to 3/8 studs?

Click to expand...

3/8 Bolts?

http://www.britishfasteners.com/threads/bsc.html
http://www.tap-die.com/contents/en-uk/d ... Sizes.html

= 8.65 - 8.7mm.

Bolts sorry!

Rethread the cylinder barrell

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