3/4 x 12tpi (BSF) tap

Advert

New Replies

Report Bug

Help/FAQs

3/4 x 12tpi (BSF) tap

This topic has 11 replies, 5 voices, and was last updated 21 August 2013 at 07:19 by JasonB.

Viewing 12 posts - 1 through 12 (of 12 total)

Author

Posts
20 August 2013 at 16:20 #127389
mark cross
Participant
@markcross70685
Hi,

Does anybody have a 3/4BSF tap? I am looking for a hole to be tapped into a piece of Aluminium, Brass or Stainless to hold the collar of a dremel. I am not that bothered which and can supply the material if necessary. The piece is going to be 30mm x 100mm x 10mm thick, or imperial equivalent, so it should be easily postable.

I am not looking for a freebie- happy to pay the going rate, I just dont want to have to buy a tap and drill bit that i am never likely to use again.

If anybody can assist, I would be most grateful.

Mark

Edited By mark cross on 20/08/2013 16:20:37
Advert

20 August 2013 at 16:20 #22782
mark cross
Participant
@markcross70685
20 August 2013 at 16:20 #127390
mark cross
Participant
@markcross70685
I am in Leeds if that makes a difference.
20 August 2013 at 16:30 #127393
JasonB
Moderator
@jasonb
I thought they had a 3/4"x 12 UNS (Unified Special) thread which has a different thread angle to BSF.

You may get away with an obscure M19x2.0 but that really wants single pointing.

BSF may work as the plastic casting is not to that high a tollerance

J

Edited By JasonB on 20/08/2013 16:34:59
20 August 2013 at 16:36 #127394
mark cross
Participant
@markcross70685
you could be correct- it would explain why they chose what I had assumed to be an obsolete and obscure British one, rather than a Unified. From what I have read about the male threads on the dremel is that they are pretty sloppy, and so the BSF should fit. I read somewhere that a 19 x 2 will work too. I imagine that a UNS tap would be made to order and that the chance of somebody having one of those is absolute zero!?
20 August 2013 at 16:37 #127395
mark cross
Participant
@markcross70685
sorry Jason, just seen your edit which says most of what I just have.
20 August 2013 at 19:04 #127410
Peter Tucker
Participant
@petertucker86088
Hi Mark,

What about using a two or three mm thick steel plate, boring a 3/4" hole and mounting the dremel with it's own plastic nut.

Peter.
20 August 2013 at 19:49 #127419
mark cross
Participant
@markcross70685
Peter,

that is a good suggestion. It is certainly a plan B, and/or something to try out first.

Thanks

Mark
20 August 2013 at 20:18 #127429
JasonB
Moderator
@jasonb
Well I had to clean off some rust to be able to read what size taps they were but 3/4"x12BSF fits. It does need about 2mm taking out to clearance so the adaptor will screw down snug to the body as the plastic thread is not moulded all the way.
20 August 2013 at 20:46 #127434
Anonymous
Mark,

I have a set of 'as new' 3/4" BSF taps. If that's of any help PM me.

Technically 3/4"-12 UN is part of the UN fixed pitch series, not UNS.

Regards,

Andrew
20 August 2013 at 21:39 #127441
Sub Mandrel
Participant
@submandrel
Jason,

Thiose taps would be an excellent test of the 'cheap cola' treatment. Are you up for soaking them for a weak in value coke, then reporting back?

Neil
21 August 2013 at 07:19 #127455
JasonB
Moderator
@jasonb
I'll have to go out and get some cheap stuff only got the real thing.

J
Author

Posts