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What’s this tap? Thread form?

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Ian Parkin10/03/2021 17:02:32
1016 forum posts
236 photos

I found in my large taps drawer and have being using this tap...

theres no markings on it but it measures 1 .31 “across the peaks and pitch is 11 tpi

so i can see that its a 1 5/16 11tpi and if i cut a 55 degree male part it screw perfectly into a hole tapped with this tap.

but what purpose would it have originally served

all my books don’t seem to have any taps of 1 5/16 diameter


Edited By Ian Parkin on 10/03/2021 17:04:03

Split Pin10/03/2021 17:06:57
13 forum posts
1 photos

1" BSP

Tony Pratt 110/03/2021 17:09:14
1926 forum posts
12 photos

You need to get an older book showing the state of play before threads were standardised or it could be a 'special'


Keith Long10/03/2021 17:09:52
876 forum posts
11 photos
Posted by Split Pin on 10/03/2021 17:06:57:

1" BSP

thumbs up

Ian Parkin10/03/2021 17:10:43
1016 forum posts
236 photos

Thank you split pin

Oldiron10/03/2021 17:12:07
960 forum posts
40 photos



Edited By Oldiron on 10/03/2021 17:14:37

Tony Pratt 110/03/2021 17:16:18
1926 forum posts
12 photos
Posted by Keith Long on 10/03/2021 17:09:52:
Posted by Split Pin on 10/03/2021 17:06:57:

1" BSP

thumbs up

Good shout!

colin hawes10/03/2021 17:24:29
557 forum posts
18 photos

Stubby taps always make me think.... Pipe thread. Colin

noel shelley10/03/2021 18:18:09
1278 forum posts
21 photos

Yep ! As said 1" BSP but I think BSPP. The treads look parallel . Noel

Howard Lewis10/03/2021 20:01:41
6005 forum posts
14 photos

Zeus Charts quote 1" BSP as 1.309" OD, 11 tpi so my vote is 1" BSP, like all the others.

DON'T bin it, it may come id handy one day!


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