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Hi guys anybody know the size of these bolts ie length, dia, thread .thanks
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SP2139. 3/8" - 16 x 1.5" with washer (zinc). Washer is captive I think. From memory this all means 3/8" dia thread, 16 threads per inch, 1.5" long. |
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quote:
Originally posted by HK1837
this all means 3/8" dia thread, 16 threads per inch, 1.5" long.
Which would make it a 3/8" UNC x 1.5" bolt, in layman's terms. Dr Terry |
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I always struggle with UNC, UNF, Whitworth etc! I've never really taken the time to understand and comprehend it all properly. |
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quote:
Originally posted by HK1837
I always struggle with UNC, UNF, Whitworth etc! I've never really taken the time to understand and comprehend it all properly.
It's pretty straight forward with pre-metric Holdens. Whitworth was not used at all by Holden, with the exception of a few small items like some battery clamps & exhaust clamps supplied by outside venders. All fine threads were UNF & all course threads were UNC, bar plumbing threads which were NPT. Dr Terry |
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pretty sure they are more than 1 1/2 inches long.
for the commodore Holden seem to have done a list of all possible metric sizes and then found somewhere to use them. in the old days about 4 spanners would fit everything.
not now.
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And don't forget John - on VB-VK (+ VL V8) it's metric on the body & suspension (you really only need 8, 10, 13, 15, 17 & 19mm), and imperial on the driveline.....
Puts both sides of the socket sets to good use. |
Cheers,
Mick
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Interesting sublect. As a plumber I know NPT as BSP ( British Standard Pipe ) as a gasfitter I know it as GAS thread. I think you will find BSP was originally based on the internal diameter of the steel pipe used for water pipe. Back to threads and spanner sizes though. Some of you may have noticed an AF ( American Fine) or (Across Flats) is also known as SAE ( Standard American Engineers), UNF, UNC etc all of which, quite apart from the thread dimensions, all relate back to the opening size of the spanner that is the measurement across the head of the bolt. As distinct to some others i.e Whitworth, BSW, BSW, BS you will find that these sizes originally related back to the diameter of the thread of the bolt. If you like to complicate things though all those sizes mentioned above, and many more, have many different thread configurations e.g. the number of teeth per inch ( TPI ), pitch, thread angle etc etc.
....Jack
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Interesting indeed . And then there's BA (British Association) with numbered sizes,the convention seemed to be odd numbers for electrical equipment & even for radio & instrument stuff. British bicycles had/have BSC (British Standard Cycle) with Raleigh & Sturmey-Archer using their unique version of it to cause confusion, like 19/32" axles and not 3/8", bottom brackets with the same diameter as others but 26tpi instead of 24tpi.
And another situation apparently dating back to early automobile manufacturing when French & English joint ventures couldn't agree on thread standards so settled on British fastener sizes but with metric threads...or maybe the converse. How confusing would that be !
Wasn't there an Acme thread ? A square section thread profile used on vices and machine tools....maybe it was a trade name.
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quote:
Originally posted by johnperth
pretty sure they are more than 1 1/2 inches long.
That was straight from the HQ parts catalogue. |
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quote:
Originally posted by blameyone
Interesting sublect. As a plumber I know NPT as BSP ( British Standard Pipe ) as a gasfitter I know it as GAS thread. I think you will find BSP was originally based on the internal diameter of the steel pipe used for water pipe. Back to threads and spanner sizes though. Some of you may have noticed an AF ( American Fine) or (Across Flats) is also known as SAE ( Standard American Engineers), UNF, UNC etc all of which, quite apart from the thread dimensions, all relate back to the opening size of the spanner that is the measurement across the head of the bolt. As distinct to some others i.e Whitworth, BSW, BSW, BS you will find that these sizes originally related back to the diameter of the thread of the bolt. If you like to complicate things though all those sizes mentioned above, and many more, have many different thread configurations e.g. the number of teeth per inch ( TPI ), pitch, thread angle etc etc.
....Jack
A few points to make here, & few myths to bust. 1. BSP (British Standard Pipe) & NPT (National Pipe Thread) are both pipe threads & yes they are based on the ID of the pipe concerned, but the are different in thread angle & in some sizes the TPI is also different. BSP is a British standard (obviously) while NPT is the US standard. Unfortunately they are both loosely called GAS threads, which adds to the confusion. 2. A/F was never 'American Fine' it was always 'Across-The-Flats' & was usually used to describe SAE bolt heads, i.e. 1/2" or 3/8' etc. It might seem strange to some but metric bolts also use 'A/F type' spanners, 12 mm is still measured across he flats of the hexagon making it officially 12 mm A/F. 3. Even though UNC & UNF are both SAE which is basically an American standard, most British manufacturers after WW II adapted it because Whitworth & BSW etc, were too cumbersome for automotive use. BSP however was retained because NPT offered no advantages, it was just different. 4. Cars built to the metric standard still use BSP for there plumbing fittings, because there is no 'metric plumbing standard'. Dr Terry |
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Yes Dr Terry that is correct AF is Across the flats not American Fine but I mentioned American Fine to cover all variations in terminology. And Yes NPT and BSP are not compatible but the terminology is confusing things. However all those 4 inch water pipes myself and the bloke on the other end of the stocks and dies we were hand threading at Chullora or Eveleigh Railway workshops as apprentices were BSP, but I'm sure at the time we were not thinking about the name of the thread for I think all water pipes and gas pipes were BSP, the pipe standard then and as you've quite correctly stated Dr Terry still the standard used for water including automotive applications and gas. From a Plumbers point of view though there used to be only the thread size i.e BSP ( originally taken from the internal diameter of a steel pipe) and the pipe size for copper tube, the size taken from the external diameter of the tube BUT since introducing metric sizes it's neither. What was once say 1/2 inch copper fitting i.e 1/2 O.D copper tube is now called a 15 mm which somehow relates to the tube size and the thread size.
....... Jack
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