Singer HA-1 Instruction Manual page 2

Your HA-1 Sewing Machine
This is a generic instruction manual for straight stitch
sewing machines that are commonly known as HA-1s.
The HA-1 machine is mechanically a clone of the very
old Singer 15 class, such as the 15-30 or 15-87. Many
later 15 class Singers, such as the 15-91, used a differ-
ent shuttle/bobbin case arrangement which was mostly
reversed from this style. However, this early style be-
came so prevalent that Singer eventually switched back
to the earlier arrangement.
HA-1 machines have been sold with hundreds of dif-
ferent nameplates, but are all essentially the same.
Most of the HA-1 machines have been built in the far
eastern countries since the end of WW2. There have
been numerous modifications, but the basic machine
has remained so similar that this instruction book will
cover the important points for many machines.
The bobbins are the common 15 class, and the needles
are known as 15X1 (US), 705 (H or B, European), or
HAX1 (Japanese or other far eastern), followed by the
# that designates the size. A US size 16 = a European
size 100, size 14 = size 90, size 12 = size 80. The Euro-
pean # tells the actual size of the needle, such as the
100 is 1mm in dia., the 80 is .8mm in dia., etc.
Prepared by:
Bill Holman
Madison, WI
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