Special characteristics of machines of class 251 – SINGER 251 User Manual
Page 4
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SPECIAL CHARACTERISTICS OF
MACHINES OF CLASS 251
MACHINES (CLASS AND VARIETY)
251-1
251-2
251-3
251-3 (HEAVY)
TYPE OF
MATERIAL
Light-Weight
Medium-Heavy
to Light-Weight
Heavy to
Light-Weight
Extra-Heavy to
Light-Weight
MAXIMUM
SPEEDt
(R.P.M.)
5000
5000
4300
4300
MAXIMUM
STITCH
LENGTH
7
per inch
5-1/2
per inch
5-1/2
per inch
5-1/2
per inch
NEEDLE BAR
STROKE
(Inches)
1-9/64
1-13/64
1-7/16
1-7/16
PRESSER BAR
LIFT
(Inch)
9/32
5/16
3/8
7/16
NEEDLES:
CLASS
AND
VARIETY
88 X 9
16 X 257
16 X 257
16 X 261
SIZES
RECOM
MENDED
8, 9,10,11,12,
13, 14, 16,
17, 18, 19,
20, 21 and 22
8, 9, 10, 11, 12, 13,
14, 16, 17, 18, 19,
20, 21,22, 23 and
24
8, 9, 10, 11, 12,
13, 14, 16, 17,
18, 19, 20, 21,
22, 23 and 24
16, 18, 19, 21,
22 and 23
fDependent upon nature of material and ability of operator.