Thread sizes

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Big Jim
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Re: Thread sizes

Postby Big Jim » Wed Jun 29, 2016 6:06 pm

Can someone help me with the thread size of the 2 winged screws on the font stick of the hood frame ?
Thanks


gmbailyes
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Re: Thread sizes

Postby gmbailyes » Thu Oct 13, 2016 12:37 pm

Hi, I've just set out on the Morris Minor journey and I'm currently tidying up the engine bay. I noticed when removing the fan that one of the bolts on the timing chain cover was missing. I see from the bolt chart that this could be either a 1/4" or 5/16th bolt. (Great list btw) . I just need a little further guidance as to what exactly to order eg. length etc. I'll buy both just to have some spares. I have a 1967 1098 saloon. Thanks

philthehill
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Re: Thread sizes

Postby philthehill » Thu Oct 13, 2016 12:53 pm

The 1/4" UNF screw into the front engine plate - the 5/16" UNF screw into the block.
The BMC part numbers are 1/4" UNF = HZS0403................5/16" UNF = HZS0505.
If you order the above part numbers you will get the right length set screws.
Items No: 51 & 54 in the attached link:-

http://www.moss-europe.co.uk/shop-by-mo ... 0f3d3.html

You will need the spring washers as well.


TvdWerf
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Re: Thread sizes

Postby TvdWerf » Thu Nov 10, 2016 9:05 pm

I found some 5/16 NF taps between the BSF , but when I look at it, and tried it in the body, for the wing bolts, it goes by hand...
What is the difference between NF and BSF?
MM '51 LHD sidevalve

philthehill
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Re: Thread sizes

Postby philthehill » Thu Nov 10, 2016 9:26 pm

I take it that when you refer to NF you mean UNF.
The 5/16" Unified National Fine (UNF) tap/thread has 24 threads per inch and the 5/16" British Standard Fine (BSF) tap/thread has 22 threads per inch.


TvdWerf
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Re: Thread sizes

Postby TvdWerf » Fri Nov 11, 2016 5:25 am

No, there is for sure NF stamped, not UNF on different taps....
And because the U is missing, and the tap is going by hand in a new 5/16 BSF nut, I wondered about it..
It are old taps ;)
MM '51 LHD sidevalve

philthehill
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Re: Thread sizes

Postby philthehill » Fri Nov 11, 2016 8:31 am

The NF stands for American National Fine (NF)
During the second world war differences in the thread pitch and form caused serious problems especially in engine manufacturing and repair; therefore it was agreed that the pitch would be standardised at 60 degrees and that the root would be round and the tip could be optional either being flat or rounded. The new classification was Unified National Fine (UNF).
There is little difference between 22 and 24 TPI that the tap may well screw in with little effort.

https://sizes.com/tools/thread_ncnf.htm


IslipMinor
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Re: Thread sizes

Postby IslipMinor » Fri Nov 11, 2016 2:00 pm

thread size of the 2 winged screws on the font stick
Definitely 5/16" BSF!

On a Minor anything to do with the body, including suspension mounts, was originally BSF or for the small threads BA - I can't think of a BSW thread anywhere, but is there?

Some of the replacement body related parts use UNF or even a metric thread!
Richard



midget
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Re: Thread sizes

Postby midget » Fri Nov 11, 2016 2:39 pm

IslipMinor wrote:
thread size of the 2 winged screws on the font stick
Definitely 5/16" BSF!

On a Minor anything to do with the body, including suspension mounts, was originally BSF or for the small threads BA - I can't think of a BSW thread anywhere, but is there?

Some of the replacement body related parts use UNF or even a metric thread!

Lots on the Van Richard.
I had to restock with WW sockets to strip mine.
John

philthehill
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Re: Thread sizes

Postby philthehill » Sat Nov 12, 2016 9:58 am

Original 5/16" body captive nut threads are BSF with the set screws having 1/4" BSW Whitworth heads so the requirement/need for Whitworth spanners/sockets.


Declan_Burns
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Re: Thread sizes

Postby Declan_Burns » Sat Nov 19, 2016 1:39 pm

Just to add some more thread info.

I'm pretty sure that the master cylinder filler cap has a 1.1/8" X 20 TPI BS cycle thread.
The blanking plug at the rear is 1" X 20 TPI BS cycle thread. This I can confirm as I sent Tracy Tools a blanking plug to check when I bought the die from them earlier in the year.
The dies are available from Tracy tools.
http://www.tracytools.com/taps-and-dies ... YCLE-PITCH

Regards
Declan


Regards
Declan

TvdWerf
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Re: Thread sizes

Postby TvdWerf » Fri Jan 20, 2017 8:00 am

I should like to have a list of sidevalve bolts and nuts, complete with the torque.
In the manual from the MM, nothing is written about it.
In a post from Mike, I found the head bolts, M10; 44 lb/ft, but the crank shaft bolts are also important.
I think this information should be in the topic "Thread sizes" ;)
MM '51 LHD sidevalve

BTU268F
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Re: Thread sizes

Postby BTU268F » Sat Feb 04, 2017 10:15 pm

Hi, can anyone tell me the thread size for the fixings for the floor mounted dipswitch, back of my head I have 2ba but wanted to check before ordering any. Thanks in advance.

les
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Re: Thread sizes

Postby les » Sat Feb 04, 2017 10:18 pm

I may be wrong but I'm thinking they were/are self tapping screws.


BTU268F
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Re: Thread sizes

Postby BTU268F » Sat Feb 04, 2017 10:32 pm

Yes self tappers to hold the switch to the metal plate, but it's the fixings for the plinth that rests on the floor.
Morris-Minor-1000-High-Low-Foot-Beam.jpg
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les
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Re: Thread sizes

Postby les » Sat Feb 04, 2017 10:36 pm

Ah right. I cant help then, only to suggest 2 ba would be a good bet.


jagnut66
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Re: Thread sizes

Postby jagnut66 » Sun Feb 19, 2017 4:08 pm

Hi,
Just seen this and more specifically the list on page 1. Very useful.
Best wishes,
Mike.
(Still missing) Olwyn Image

BTU268F
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Re: Thread sizes

Postby BTU268F » Sun Feb 19, 2017 4:39 pm

[quote="les"]Ah right. I cant help then, only to suggest 2 ba would be a good bet.[/quote

Yes 2ba fitted perfectly

IslipMinor
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Re: Thread sizes

Postby IslipMinor » Wed May 31, 2017 8:50 pm

I have made some updates and additions to the list of bolt/thread sizes, using various sources, including the later posts in this thread.

Also inserted a column for the bolt/screw/stud length as they become available.

Please let me know of any updates that should be included.
Richard



Declan_Burns
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Re: Thread sizes

Postby Declan_Burns » Sun Jul 23, 2017 3:41 pm

Here's another strange one.
The filler cap on the top of the front damper.
From my measurements it is certainly 26tpi and measures 7.9mm OD diameter which suggests 5/16".
I doubt if it is BSB which has 26tpi and is 55°.
I am nearly sure it is 5/16 x 26 BS Cycle, 26tpi and 60°.
Can anybody confirm?

Regards
Declan


Regards
Declan


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