[Healeys] Fuel Line BSPP Olive and Nut

gradea1 at charter.net gradea1 at charter.net
Sun Feb 9 20:41:46 MST 2020 

Folks-let's not forget our favorite fasteners: BA...these are all the
small ones that you drop and never find. Here is some info:

	BA sizes are specified by the following British Standards [1]:

	* BS 57:1951 — B.A. screws, bolts and nuts
	* BS 93:1951 — Specification for British Association (B.A.) screw
threads with tolerances for sizes 0 B.A. to 16 B.A.
	* BS 93:2008 — British Association (B.A.) screw threads —
Requirements

	The angle of the thread is 47.5°[4] [2]:2 and the depth of thread is
0.6 times the pitch with rounded tops and bottoms. Thus the shortening
at the crest and root is given by 0.26817_p_ with a radius of
0.18083_p_ at both crest and root.[4] [3]:2 The 1884 report specifies
a radius of 2/11_p_ ≈ 0.181818_p_ but this was an approximation to
the correct value.

	The pitch diameter of the thread is simply OD − 0.6_p_ and the
minor diameter is OD − 1.2_p_.

	The thread angle is different from that used by Whitworth (55°), US
Unified threads (60°) and ISO Metric (60°) so BA fasteners are not
properly interchangeable with Whitworth or metric ones even when the
pitch and diameter are similar enough that they can be screwed
together (e.g., although 0BA appears similar to M6×1mm, the male and
female surfaces do not mate properly for bearing a load). Standard BA
sizes are defined between 0BA and 22BA. The even sizes are much more
common and the very small sizes are not used very often and other
standards tend to be used (e.g., NHS).

		BA
		THREAD PITCH
		OUTSIDE DIAMETER
		THREADS DENSITY
		OUTSIDE DIAMETER
		SPANNER

		(MM)
		(MM)
		(IN−1)
		(IN)
		(MM)
		(IN)

		0
		1.00
		6.00
		25.40
		0.2362
		10.5000
		0.4134

		1
		0.90
		5.30
		28.22
		0.2087
		9.2750
		0.3652

		2
		0.81
		4.70
		31.36
		0.1850
		8.2250
		0.3238

		3
		0.73
		4.10
		34.79
		0.1614
		7.1750
		0.2825

		4
		0.66
		3.60
		38.48
		0.1417
		6.3000
		0.2480

		5
		0.59
		3.20
		43.05
		0.1260
		5.6000
		0.2205

		6
		0.53
		2.80
		47.92
		0.1102
		4.9000
		0.1929

		7
		0.48
		2.50
		52.92
		0.0984
		4.3750
		0.1722

		8
		0.43
		2.20
		59.07
		0.0866
		3.8500
		0.1516

		9
		0.39
		1.90
		65.13
		0.0748
		3.3250
		0.1309

		10
		0.35
		1.70
		72.57
		0.0669
		2.9750
		0.1171

		⋮

		25
		0.072
		0.25
		352.78
		0.0098
		0.4375
		0.0172

You can obtain these and the tools to turn them with from:
Britishfasteners.com in Lyons, N.Y. They have a great selection. I
have a nice set of King Dick BA wrenches in a pouch, which I purchased
from them. Hank, healeyhelper.com

	-----------------------------------------From: "Curtis Arndt" 
To: "Bob Spidell", "Harold Manifold"
Cc: "Healey List"
Sent: Sunday February 9 2020 6:20:04PM
Subject: Re: [Healeys] Fuel Line BSPP Olive and Nut

  Regarding where to source these fasteners, The late Doug Reid is
where I used to get mine. But now, Joe Curto may have them.  
   Cheers,   
   Curt   
   On Sun, Feb 9, 2020 at 6:16 PM Curtis Arndt  wrote:
    Harold,  
   BSPP or British Standard Pipe Parallel is one of the five basic
"Whitworth" Thread Form fasteners used on Austin Healeys. The other
four include in the order of most to least prevalent... BSF (British
Standard Fine), BSW (British Standard Whitworth), BSPT (British
Standard Pipe Tapered), and lastly BSB (British Standard Brass).   
   Whitworth fasteners are those fasteners that by definition (The
British Standards) have a 55 degree thread pitch angle versus the 60
degree thread pitch angle of most other fasteners. Also the TPI or
(Threads Per Inch) are in most, BUT NOT ALL cases different from their
UNF/UNC counterparts. Finally the hex sizes are different but contrary
to popular belief, it is NOT the head size that determines whether a
fastener is Whitworth or not, it is in fact the thread pitch angle of
55 degrees (as previously stated).   
   Cheers,   
   Curt   
   On Sun, Feb 9, 2020 at 5:52 PM Bob Spidell  wrote:
    This guy might be able to help:

 [6]https://www.sufuelpump.com [7]

 There's no olives on my BJ8 pump--I've changed it out many times--and
I don't recall one on my BN2, either (and I don't see one in the Moss
catalog). Where does this olive go?

 Bob

  On 2/9/2020 4:05 PM, simon.lachlan at alexarevel.plus.com [8] wrote:

	See :- 

	 [9]http://sucarb.co.uk/catalogsearch/result/?q=olive [10] 

	Could it be item AUA 1486? 

	If you were feeling sneaky, you could ring them up and check out the
item. Then, armed with precise details, buy it locally. 

	Simon 

	FROM: Healeys  [11] ON BEHALF OF Harold Manifold
 SENT: 09 February 2020 23:05
 TO: Healey List  [12]
 SUBJECT: [Healeys] Fuel Line BSPP Olive and Nut   

	Hello,   

	I made a new fuel line for my Mk1 BT7 from 5/16" copper nickel
tubing. I am having trouble finding the proper olive and nut to
connect to the fuel pump. Picture attached. Based on measurements of
the olive and nut for the fuel line between the pump and the tank the
size is BSPP 1/4" x 5/16". I am not completely familiar with BSPP
fittings but I know they have their own unique seat angle which is why
I don't want to mix and match.   

	Any recommendations for a source for these fittings?   

	Thanks... Harold   

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Links:
------
[1] https://en.wikipedia.org/wiki/British_Standards
[2]
https://en.wikipedia.org/wiki/British_Association_screw_threads#cite_note-bs93:2008-4
[3]
https://en.wikipedia.org/wiki/British_Association_screw_threads#cite_note-bs93:2008-4
[4] mailto:cnaarndt at gmail.com
[5] mailto:bspidell at comcast.net
[6] https://www.sufuelpump.com
[7] https://www.sufuelpump.com
[8] mailto:simon.lachlan at alexarevel.plus.com
[9] http://sucarb.co.uk/catalogsearch/result/?q=olive
[10] http://sucarb.co.uk/catalogsearch/result/?q=olive
[11] mailto:healeys-bounces at autox.team.net
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