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

4300

MAXIMUM
STITCH

LENGTH

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

PRESSER BAR
LIFT

(Inch)

9/32

5/16

3/8

7/16

NEEDLES:

CLASS

AND
VARIETY

88 X 9

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

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.