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Part 20b: Flanged wheel, ¾''

20bFlanged wheel, ¾'' 1927-10104N°7

The parts

Small flanged wheels (larger one on left)
Loading picture Smallflangedwheels The small flanged wheel was introduced in 1927 and initially used only in the Geared Roller Bearing (part 167) with large flanges.  It was very soon added to the list as a standalone part.  The large flange was subsequently reduced, and the part went through the usual range of colours and finishes from this period on.

In this picture, the large flanged variety is shown to the left, and the more common one to the right.  There is plenty of variation in the flange size, and you should make sure you have a 'matching set' of wheels if possible.

Chronological variations

The small flanged wheel came in at almost exactly the same time as bosses became double-tapped.  It is thought that all of them are double-tapped, although we can only expect to prove the opposite. 

Double tapping is presumed to have started in early 1928. The GBSC requires double tapped collars in the Fidler's gear. The leaflet refers to them as "recent" and points out that people who don't have them can use spiders from universal couplings instead. 20b was introduced in late 1927. The MM anouncement of Dec 1927 shows no visible tapping in the boss, which suggests it is single. However the Boiler announcement in Jan 1928 MM shows a double tapped one used with a sleeve piece as an oscillating cylinder.

These MM pictures, however, are notoriously unreliable. The same picture shows the sleeve piece with a single hole on all three sides, instead of having two holes opposite the slit.

I do not have, and have never seen, single tapped ¾'' Flanged Wheels. They may have been single for a month or two before going double, I don't know. We need someone to say, "I've got some," and send a picture.

John Nuttall

Although there may possibly be pre-production or sample parts with single-tapped bosses, I would expect them to be exactly that.  The author has an almost mint outfit 4 from December 1927, right on the cusp of the change to double-tapped bosses.  Most of the common parts are stamped "Meccano" and double tapped.  The gears are stamped "Fabrique en Angleterre" and single tapped, as was the case from 1921 to 1927.  It seems that in this outfit there was still a stock of certain parts being used up in the older single-tapped style.  The outfit has no small flanged wheels, which were introduced to the outfit 4 in the following year.  It seems very unlikely that it would be introduced single-tapped.

Variations and oddities

None known

Dealer spare parts boxes

Small flanged wheels from 54-63 (left) and late 60s (right)
Loading picture Smallflangedwheelspareparts The picture to the right shows two dealer packs of the small flanged wheels.  Like their larger brothers, these are inexplicably packed in threes.  The box to the left is from 1954 on (with the product code 12090) but since the parts are brass the label would have remained yellow until 1963/64.  The box to the right with the blue label and pale yellow box would have been somewhere between 1964 and the end of that decade.

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
Brass, deep rim for GRB.  31/32'' overall diameter27.br1
Brass, standard rim for outfits, 3/4'' overall diameter27.br2
Steel face, enamelled blue34.nb
As above but red37.re
Nickel-plated, pre-war stamping??.ni
Plain brass casting, post-war46.br
One-part alloy casting, painted black (Korean) †51.bk
One-part alloy casting, matt brass plated, boss attached73.bm
One-part alloy casting, matt brass plated including boss73.bm1
One-part alloy casting, zinc78.zn
One-part alloy casting, iridescent79.ir

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

kbisset      (at 9:07pm, Mon 5th Aug, 13)

As discussed in the Rust Bucket (collectors), a single tapped version (tapped UN #7-32!) was made in the US. A comparison picture is in my gallery...


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