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Part 126/a: Trunnions

126Trunnion1921-448N°00Announced May 1921
126aFlat Trunnion1921-8812N°0Announced Sept 1921

Trunnion and Flat Trunnion in 1950s green
Loading picture Trunnions The parts

Another exceptionally common and quite simple part, the trunnion and flat trunnion are included in almost every single Meccano outfit, the trunnion even in the tiny outfit 00 of 1955-60.  The parts were introduced in 1921, with the trunnion announced in the May 1921 edition of the Meccano Magazine, and the flat trunnion just a few months later in the September issue.

Coincidentally, the trunnion was also mentioned in the March 1921 suggestions section (along with the reverse angle bracket), although it is mentioned there as being "in process of manufacture" rather than "already added to our list of parts".  We could perhaps draw from this a suggestion that the trunnion was available after the reverse angle bracket (part 124) but before the flat trunnion.

Although the flat trunnion was included in every outfit from 1922 onwards, the trunnion was originally only supplied in the very largest outfit 7 of 1922.  It was included in the outfit 6 from 1924, but wasn't brought down to the very smallest outfits until 1928, after which it became a very common part.  For this reason, the trunnion is quite rare in nickel plate and pea-red finishes.

Interestingly, the definition of the word 'trunnion' is of a pin or pivot, especially a pair of such pivots allowing something like a cannon to pivot.  In truth, these Meccano parts are mounts on which trunnions can be attached (either bolts or pivot bolts or even an axle), but the parts themselves are not trunnions.  However, such was the power of Meccano, a large number of people now refer to any side mounting plates or brackets as trunnions.

Chronological variations

One of those rare absolutely consistent parts from its introduction in 1921 through to the end of production, it does however have the honour of being one of the most varied in colour schemes, certainly if you include the many colours that the flat trunnion has been produced in since 1979.  We may have difficulty getting pictures of all of them!

The only change to the trunnion was the odd variation (along with many other parts) where the irregularly shaped holes were omitted in the Mechanised Army parts of 1939-41.

Variations and oddities

None known, as yet.

Dealer spare parts boxes

Trunnion pack from late 50s
This image does not belong to the webmasters and is copyright.
Please do not download or copy it for any purpose. It has been
kindly provided for use on this site by the image owner,
William Irwin
Loading picture Trunnionspareparts1
Flat trunnion pack from 58-63
This image does not belong to the webmasters and is copyright.
Please do not download or copy it for any purpose. It has been
kindly provided for use on this site by the image owner,
William Irwin
Loading picture Trunnionspareparts2

Individual part numbers

Part numbers for the parts on this page are as follows:    Unique part numbers
For identification, each variation has been given a suffix to the main Meccano part number. These suffixes consist of a two-character code for the colour, and if there are many variations, a further number and sometimes letter code to identify each variation. See the bottom of the 'Parts' page for further details.

You don't need to worry what the codes are, just click on any one for a photograph.

The button above turns on and off the display of DMS numbers (where they are known). The DMS (Development of the Meccano System, Hauton and Hindemarsh) published in 1972 and added to in 75 and 82, suggested part numbers for every variation of every Meccano part. These numbers aren't perfect, but they are recognised and also referenced in the EMP (Encyclopedia of Meccano Parts, Don Blakeborough).

More about bosses More about stampings More about paint colours
Nickel plated 21.ni.ni
Early red (pea-red) 26.re1.re1
Dark green 27.dg.dg
Medium green (pre-war stamping) 33.mg1.mg1
Gold 34.go.go
Red 37.re.re
Matt olive green † 39-41.ma 
Medium green (post-war stamping) 45.mg.mg
Light green 58.lg.lg
Yellow 64.ye.ye
Olive green (Army Multikit) † 73.am.am
Dark yellow 78.dy.dy
White † 79-85.wh.wh
French blue 82-97.fb.fb
French yellow † 85.fy.fy
Dark grey † (Space warrior/Interceptor) 93-96.gy.gy
Red (Starter/Dynamic sets) 94-99.re2.re2
Red (Evolution/Collection sets) 96-99.re2a.re2a
Yellow (Evolution/Collection sets) 96-99.ye2 
Light orange † (Mission Universe) 97-99 .or1
Zinc plated 98.zn.zn
Black 98.bk.bk
Black crackle † (Anniversary set) 98 .bk1
Matt black † (Roto truck) 98 .bk2
Electric blue † (Survivor car) 98.bl1.bl1
Dark red † (Centennial blocksetter) 98.dr1 
Fluorescent green † (2 model helicopter) 00-04 .gr1
Green crackle † (2 model helicopter)05 .gr2
Orange † (7 model helicopter) 00 .or
Sand yellow † (King Ghidorah) 06 .ye3
Dark red † (Vintage set) 07 .dr1

Please send us pictures of missing parts! Hints and tips for pictures
Take a picture of the part in very good light, preferably on a plain yellow background, without a flash but with a tripod.
Ideally, trim the picture to about 150 pixels per inch of the Meccano part (unless the part is particularly big or small), save it as a reasonably good quality jpg file with a filename of exactly the part number, for example 19b.ni1.jpg, and email it to us by clicking on 'Contact us' at the top of the page. Thanks!

Further information

Total number of messages on this page: 9.  This is page 2 of 2.   Previous

Martin Hanson      (at 11:33am, Wed 29th Jul, 09)

You beat me to it Richard ! 1964 onwards trunnions are definitely yellow, I do not think I have even seen a zinc one. If they were not yellow in 64 then they would have been silver paint or even nickel, no zinc on anything until 66 or later.
PS - I got some very interesting error messages when I tried to post this message containing single apostrophes.

Reply: Thanks Richard and Martin, I published this page half-finished unintentionally... now I've corrected the colours (I think) including Oscar's more recent offerings, so we have a whole lot more colours to find apparently... It also looks like I broke the comments engine's ability to handle apostrophes... I believe it's fixed now (I hope), sorry about that!

Dick Watson      (at 7:43am, Wed 29th Jul, 09)

I think that you ought to mention the Primus trunnion, the Meccano one being almost certainly a simplified version. This, in turn, was modelled on the axleguards of the traditional British 4 wheeled goods wagon. Also, the Argentinan variations deserve a mention. You might also explain the cunning placing of the bend in 126.

Reply: I can't find a Primus trunnion easily, having thrown away hundreds of them! A good picture would be nice. Do we have a reasonably accurate date as to their introduction? I'd like to know more about the "cunning placing" of the bend -- what exactly were you meaning?

Richard Payn      (at 3:44am, Wed 29th Jul, 09)

Hi Charles,
The trunnion and flat trunnion from 1964 are yellow. I reckon the zinc plate one you have a picture of is French.

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