What does this mean?

Profile picture for user Beermat

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10 years

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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) [ATTACH=CONFIG]231928[/ATTACH]
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Original post
Profile picture for user MerlinPete

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13 years 9 months

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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
Profile picture for user Beermat

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10 years

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Thanks Pete! I should have worked that out :-)
Profile picture for user MerlinPete

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13 years 9 months

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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
Profile picture for user Beermat

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10 years

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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.
Profile picture for user radarsdesk

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12 years 6 months

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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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13 years

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I wonder if it's something like Defence Department Standard ?
Profile picture for user Beermat

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10 years

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I reckon Dave has it.. Very useful, ta! Thanks everyone :-)