[Healeys] Whitworth vs UNC

Thu Dec 24 12:49:19 MST 2020

When the British auto industry was switching over from BSF/W to UNF
the explanation was published in the Austin Service Journal Volume 24.
This is a good description of the differences.Also this chart has some
very good measurements of the various hardware.
Nice Christmas cards of Healeys in the snow...I don't have any snow,
or my car out in the weather-it would be rain here in the Northwest.
Here is one of the sister car to Michael's at our local car show-last
year...none this year ..or next? Season's Best...stay safe! Hank

	-----------------------------------------From: "Harold Manifold" 
To: "Michael Salter", "Bob Haskell"
Cc: "Healey List"
Sent: Wednesday December 23 2020 6:39:51PM
Subject: Re: [Healeys] Whitworth vs UNC

 Understanding UNC and Whitworth is one thing but BSPP and BSTP
fittings is a whole 'nother rabbit hole! 

-------------------------
FROM: Healeys [mailto:healeys-bounces at autox.team.net] ON BEHALF OF
Michael Salter
SENT: Wednesday, December 23, 2020 9:48 AM
TO: Bob Haskell
CC: Healey List
SUBJECT: Re: [Healeys] Whitworth vs UNC

 Thanks Bob ... I think you have nailed it. 
 M  
 On Wed., Dec. 23, 2020, 12:46 p.m. Bob Haskell,  wrote:
  Michael,

 I'm going to guess 1/4" BSP. 0.518" OD - 19TPI.

 [1]https://britishfasteners.com/threads-bsp [2]

 Cheers,

 Bob Haskell
 Austin Healey 3000 BN7/BT7 registrar

 On 12/23/20 11:30 AM, Michael Salter wrote:
 > Well I have one for you Curt.
 > The thread on the oil drain back pipe on the 100 engine (1B1236)
has
 > me stumped.
 > The tube is 0.500" O.D. with an I.D. of 0.362"
 > The OD of the thread is 0.511" and it is 19 T.P.I.
 > I cannot find a 19 TPI x 1/2" pipe or tube spec anywhere .... any
ideas?
 >
 > M
 >
 >
 > On Wed, Dec 23, 2020 at 10:54 AM Curtis Arndt  > wrote:
 >
 > Here is an excerpt from one of my articles...
 >
 > On Tue, Dec 22, 2020 at 1:48 PM Curtis Arndt  > wrote:
 >
 > The bolt is 5/16" BSW! Don't let anyone tell you different.
 >
 > Even my 45K original mile '60 Bugeye has its original 5/16"
 > BSW bolt in the generator front plate. The problem arises
 > since a 5/16" UNC bolt has the same tpi (threads per inch) as
 > the 5/16" BSW bolt. The issue is that UNC has a thread pitch
 > angle of 60° and Whitworth by definition is 55°. The wrong
 > bolt will never torque properly and will eventually wear the
 > aluminum generator front plate.
 >
 > Cheers,
 >
 > Curt
 >
 > On Mon, Dec 21, 2020 at 3:53 PM Roger Grace
 >  wrote:
 >
 > My understanding is that they are close but not
 > interchangeable ?
 > Thread angles are slightly different.
 >
 > For AH generator adjusting link is this 5/16 W or 5/16 UNC ?
 >
 > At back of my mind think they should be Whitworth - think
 > you told me that is why they come loose if you use UNC ?
 >
 > Finding it difficult to identify one from the other.
 > Any tips to do this welcome.
 > Have a definite W bolt and comparing to UNC can only see
 > slight rounding of UNC ?
 >
 > Moss sent me a UNC bolt for this link - well that is what
 > they called it ?
 >
 > Would appreciate your expert input.
 >
 > Regards,
 > Roger Grace
 >
 >
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Links:
------
[1] https://britishfasteners.com/threads-bsp
[2] https://britishfasteners.com/threads-bsp
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