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The code is interpreted as follows.
a.
Head code.
CPOMS
CFOMS
Pan-head metric screw with cross groove
Flat-head metric screw with the cross
groove
AHEXON
BHEXON
SOWA
POWA
#20LWA
A-type hexagon nut
B-type hexagon nut
Small washer
Polished washer
Spring washer
L-CPOMS
S-CPOMS
P-CPOMS
SL-CPOMS
PL-CPOMS
SEMUSU screw (see Item e)
The symbol 0
is replaced by one of the following codes to
show the material type that is used.
=
Iron
=
Brass
Spring Steel
I
B
ST
=
b.
Nominal diameter in mm.
c.
Length in mm.
(Not used for nuts and washers.)
6-2
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