[Healeys] 100 fasteners

[gradea1 at charter.net]

Thanks to Curt for this accurate and informative article. I totally
agree that the early part numbers ie: 1B--- would designate British
fasteners, and the later three letter, three number designation
aligned the UNF hardware. That is our best clue to what was used back
then. 
This early engine has stumped me on a number of occasions and I really
feel that for that first year anything goes to get the product to the
market...a real scramble. I have a notion that this engine was sitting
in stock as surplus A-90 leftovers. The block was factory painted dk.
blue. The head on this car was "Gold Seal" rebuilt. The threads I
discussed, are most definitely British Standard Cycle (CEI) 26 TPI..
Many of the studs are BSF on one end and BSC on the other. Luckily,
these parts are available from British Tool & Fasteners, including a
full line of BSC hardware. Unfortunately they were out of 3/8 BSC
helicoils, so I had to get some from, you guessed it... Amazon. Big $$
rather than Pence. 
Yes, all this is another great unsolved mystery in Austin/BMC history.
But, what else would we have to discuss...covid? Regards, Hank

	-----------------------------------------From: "Curtis Arndt" 
To: "Hank Leach"
Cc: "Michael Salter", "Healeys", "Bob Haskell", "Curtis Arndt"
Sent: Thursday February 10 2022 6:22:39PM
Subject: Re: [Healeys] 100 fasteners

  Regarding the steel and strength ratings of British and other
fasteners, they were either "Mild" Steel (British grades unmarked or
A, B, C or K for nuts with "B" being the most common after unmarked)
or "High Tensile" steel (all other letter grades D-G [pre 1950] and
R-Y [post 1950]). The confusion appears in calling "High Tensile
Steel" - "High Speed Steel" as Michael has pointed out. 
 See my attached article... 
 Also with regard to fastener listings in the various parts manuals
and other BMC publications, if a fastener is noted with a "part
number", it is typically a Whitworth type thread form. When the
changeover to "Unified " fasteners occurred in the mid 1950s, all
Unified fasteners were noted with a new designation, describing in
code the size of the fastener. I would assume that all Unified
fasteners fell under this new coding system... But we know what
happens when we assume. 
 BTW, this Unified fastener coding is published in a chart that most
of you should be familiar with by now. 
 For those unfamiliar, the "British Standards" define "Whitworth" as
all thread forms with a pitch angle of the threads measuring 55°,
e.g., BSW, BSF, BSPP, BSPT, BSB, etc... This is in contrast to Unified
(UNF/UNC), SAE and BSCy thread forms which have 60° pitch angle of
the threads.   This is why British Standard Cycle are NOT a Whitworth
thread form despite the bolt heads using BSW/BSF spanners, and what is
erroneously published in Wikipedia... But I digress. 
 That being said, I would assume that part numbers (11B122 and 11B
298) are both Whitworth fasteners since they are listed as part
numbers. Again, we all know what happens when we assume! Since these
are specialty fasteners, and not your run of the mill bolts, who knows
how BMC designated them? One may be BSF and the other UNF. Measure
twice or have a Helicoil kit on hand! 
 Cheers,  
 Curt  
 On Thu, Feb 10, 2022 at 4:23 PM Henry G Leach via Healeys  wrote:
  I DON'T WANT TO BE A SMART ASS, HERE LIKE RALPH FOUND IN "CHRISTMAS
STORY", AND STICK MY TONGUE TO A LIGHT POLE, BUT THE TREADS FOUND ON
MY ROCKER OIL FEED PIPE ARE HSS, 26TPI. Here are two measurements with
a gauge showing the pattern. If it was 3/8 x24 UNF the job would be
done. However, I had to order a special $65 kit for the HSS Helicoils
to repair this block. 
 Now, here are our 55 degree choices: UNF 3/8 X 24, BSW 3/8 x 16, BSF
3/8 X 20, HSS 3/8 x26, BSC (old CEI) 3/8 x 26 as well, or BSPF 3/8 x
19. Unless someone re-lathed this part it is factory 26TPI for
sure-ran a tap and die in both parts. 
 A note in the Sept. 1956 parts book refers to a service change shown
here. (Vol 25, p.13 engine) The BMC group is trying to standardize
this item. Accordingly, it appears to have been UNF (11B122) on the
2.2 Diesel engine and then changed to BSF (11B 298) at engine #225030.
This engine I'm doing is from 1953 so who knows what the correct part
is? 
 In my March 1954 parts book the number for the "valve rocker bracket
with tapped hole" is 1B2110 and locating pin is 1B2111. (no mention of
TPI) That changed to 11B298 and 99.(BSF) in 1956. Of course the later
6-cyl. engines used AEC162-probably unified, but maybe still BSF. 
 If someone has the right answer, I will stick my tongue to a light
pole. Hank 

	----------------------------------------- From: "Michael Salter"
 To: "Bob Haskell"
 Cc: "Bob Spidell", "Hank Leach", "Healeys"
 Sent: Wednesday February 9 2022 10:52:51AM
 Subject: Re: [Healeys] 100 Road draft (vent) pipe fasteners

 The fasteners wouldn't be HSS ...that is used for machine tools like
drill bits and lathe tools.  
  M

 On Wed, Feb 9, 2022 at 1:47 PM Bob Haskell via Healeys  wrote:
  Bob,

 HSS - high speed steel.
 I think the threads are 3/8"-26 BSF (British Standard Fine).

 Cheers,

 Bob Haskell
 Austin Healey 3000 BN7/BT7 registrar
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