H
THE
REAR
..
"XLE--~
Section
0.17
IDENTIFICATION OF
"UNIFIED"
SCREW THREADS
The
general standardisation of
"Unified"
screw
threads makes it necessary to identify all nuts, bolts,
and
set
screws with
these
threads
in
order
to
ensure
their
correct
use with correspondingly
threaded
components and
the
fitting of
correct
replacements.
Later M.G. Midget axles have A.N.F.
or
"Unified"
screw
threads.
The"
Unified"
thread
is, however. interchangeable
with
the
American National Fine (A.N.F.)
thread
for
all practical purposes.
As an interim measure,
prior
to
the
standardlsatlon
of
the"
Unified"
th read, certain of
the
Hypoid axles
fitted
to
Nuffield vehicles have been manufactured
with A.N.F.
threaded
components, and such axles.
are identifiable from
the
fact
that
they
are fitted with
whee I
stud
nuts having
the
notch-type identification
on
the
corners
of
the
hexagon.
Care must be taken, in
the
case of
these
axles,
to
use
the
correct
nuts, bolts and
set
screws
when
fig.
H.lO.
The Identification
marks for cornponents
witn
"
Unified"
threads.
ldentlflcatlon has been standardised and is effected
in
the
following manner
:-
Nuts. By a circular groove
turned
on
the
end face
of
the
nut
or
by connected circles stamped on
one
flat of
the
hexagon.
Bolts and Set
Screws.
By a circular depression
turned
on
the
head
or
by connected circles stamped
on
one
flat of
the
hexagon.
Wheel Stud Nuts. 6y a
notch
cut in all
the
corners
of
the
hexagon.
These identification marks
are
clearly shown in
the
illustration above and It is obviously of
the
utmost
importance
that
any nuts. bolts,
or
set
screws so
marked are used only in conjunction with
their
associated components having ..
Unified"
threads
and
that
only replacement parts
with
..
Unified"
threads
are
used, as
these
are not interchangeable
with
Whitworth,
B.S.F.
or
Metric
threads.
reassembling
or
when fitting new components.
With
the
exception
of
the
wheel nuts (whIch are
notched)
there
Is no Identification mark on A.N.F.
threaded
bolts. nuts, and
set
screws by which
they
can
be-
identified readily.
Components
and assemblies which
have"
Unified ..
threads
or
A.N.F.
threads
will be identifiable by
the
new
part
numbers which have been allocated
to
them.
Certain service parts supplied
with
8.S.F.
threads
will bear no
part
numbers.
Thus-Assemblies
with
the
old
part
numbers
or
without
part
numbers have 6.S.F.
threads.
Assemblies
with
the
new
part
numbers have
"
Unified"
threads
or
A.N.F.
threads.
Spanners.
It Is
to
be noted
that
all A.N.F. and
"
Unified"
threaded
nuts and hexagon-headed bolts
are made
to
the
standard American hexagon sizes
and
that
spanners of
the
appropriate
size
must
be
used when tightening
or
loosening
them,
UNIFIED
A:N.f.
H.t6
fig. H.21.
This illustration of
the"
Unified"
thread
and
A.N.f.
thread
to
the
same seale indicates
thei
r close relattcnshlp,
MJ:;. Midget (Series .. TO
").
Issue 1 (E) 8[52
Wishvilles Classic
Automobile Library
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