Beermat
September 23, 2014 at 4:33 pm

What does this mean?

Completely stumped by this one. Bolts, ferrules, and some other random bits are listed as ‘DDS’ in the Whirlwind AP Vol III. This forms an element of the part number – where elsewhere a manufacturer’s catalogue or drawing number would appear (not a stores reference).

We can decode the numbers, as helpful descriptions are given – 1052 is a hex bolt, ‘C’ makes it a 2BA and ’25’ makes it 0.57″ long. No idea why, it just does..

But what the Hull does DDS stand for? Any older stores people out there know what this might mean?

Thanks,

Matt (WFP)

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By: Beermat - 24th September 2014 at 09:31

I reckon Dave has it.. Very useful, ta! Thanks everyone 🙂

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By: TonyT - 24th September 2014 at 00:35

I wonder if it’s something like Defence Department Standard ?

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By: radarsdesk - 23rd September 2014 at 23:22

Hi Matt,

I’m not sure what the DDS actually stands for but I’m guessing it’s a Westland own standard part, much in the same way there are DHS (de Havilland), DAS (Dunlop), VGS (Vickers), ST (Hunting Percival) etc parts.

The attached picture shows a label from a pack of bolts for the Wessex (26WX section) and the p/n is DDS2042-YA1, these were packed 17 Dec 1981.

Hope that’s of some use.

Regards

Dave

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By: Beermat - 23rd September 2014 at 20:48

I did find out that each BA / BSF size has a specific standard threaded length associated with it, while the plain shank length is variable.

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By: MerlinPete - 23rd September 2014 at 20:02

Not at all, I have never fully understood why they are specified in that way. There must be some kind of equation that let’s you work out the overall length!
American AN hardware is specified by overall length and the length if the plain part, which they call the grip length, much easier to understand.

Pete

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By: Beermat - 23rd September 2014 at 18:35

Thanks Pete! I should have worked that out 🙂

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By: MerlinPete - 23rd September 2014 at 18:02

I don’t know what DDS stands for, I would guess some kind of design scheme, but the bolts are specified by the plain shank length, which will be 0.25″. The material S1 is BSS S1 mild steel 35/45 tons per sq in.

Pete