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IDENTIFICATION OF MACHINES
Each UNION SPECIAL machine carries a Style number, which on this Class machine is stamped into the
style plate affixed to the right front of machine.
The serial number is stamped in the casting at the right rear base of machine.
Reference to directions, such as right, left, front or rear, are given relative to the operator’s position
while seated at the machine.Operating direction of the handwheel is counterclockwise, as viewed from
the right end of machine.
CLASS DESCRIPTION
Advanced high speed, single needle, flat bed machine with needle bearing assembly for left mainshaft
bushing. High throw, needle bearing needle bar drive, light weight presser bar and needle bar driving
mechanism, enclosed automatic lubricating system, filtered oil return pumps for head and base, lateral
looper travel. Maximum work space to right of needle bar, 8 1/4 inches (209.6mm).
MACHINE STYLE
56100MB
Typical application - For seaming medium and large size cotton, light and medium weight
burlap bags. Stitch range 3 1/2 to 7. Seam specification 401-SSa-1. Maxmum recommended
speed 6000 R.P.M. sewing at 3 1/2 to 5 S.P.I. and 6500 R.P.M. sewing at more than 5 S.P.I.
Recommended speed for machines operating on a duty cycle of 50% or more is 10% less
than maximum.
56100PB
Typical application - For seaming medium to large bags. Ultra High Throw, Stitch range 3 1/2
to 7. Seam specification 401-SSa-1. Maxmum recommended speed 6000 R.P.M.
56100TB
Typical application - For hemming bag openings and for producing side and bottom double
turned-in seams on woven polypropylene bags. Stitch range 3 1/2 to 7. Seam specification
401-EFb-1 or 401-SSp-1. Maxmum recommended speed 6000 R.P.M.
NEEDLES
Each needle has both a type and size number.The type number denotes the kind of shank, point, length,
groove, finish and other details. The size number, stamped on the needle shank, denotes largest diam-
eter of blade, measured midway between shank and eye. Collectively, type and size number represent
the complete symbol, which is given on the label of all needles packaged and sold by UNION SPECIAL.
Recommended needle for Style 56100MB, PB, and TB is Type 144GS. It has a round shank, round point,
No. 2 bag length, double groove, spotted, short point, chromium plated, and is available in sizes -
200/080, 230/090, 250/100.
Selection of proper needle size is determined by size of thread used. Thread should pass freely through
needle eye in order to produce a good stitch formation.
To have needle orders promptly arid accurately filled, an empty package,a sample needle, or the type
and size number should be forwarded. Use description on label. A complete order would read: “1000
Needles, Type 144GS, Size 200/080”.