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SA F ETY PR ECAUTION
· Parts identified by the IA symbol are critical for safety. Replace only with specified part numbers.
NOTE :
[ M
I indicates mechanical sym bol number.
STANDARD PART NUMBE R CODIN G
4 . 1
4 . 1 . 1
Screw coding
Standard screw part numbers are as follows.
Type of
1crew
( In
of screw
Sh•p•
( In c•plt•I l
•
Type of scr- (fim digit}
0
S
Normal screws
L
Astembled machine screws (with plain and spring washers}
(with spring washer
N
(with plain washer}
G
F
Feather sc raws
Washer head tapping screws
M Wood screws
-Type of scr- (first digitl -
� iJ it
s
M8t8ri•I lthird digit}
E
Steel
c
Stainless steel
u
Cast iron
Copper
p
B
B rass
Phosphor bronze
- Sh•pe of thread (fourth digitl -
Cron receaed
Slotted
h .
E
NomiMI di•m91er (fihh •nd 1ixth digitll
The fifth and si><th d igits ind icate a nominal diameter or
dimension. If the dimension e><ceeds
are used. The number indicates a nominal diameter or
dimension, given in millimeters, multiplied by ten.
Length 1-enth •nd eighth digitl)
The seventh and eighth digits indicate length in m i l l i
meters. T h e preceding figure is zero when t h e dimension
is smaller than
10
mm.
precision equipment whose length is given in units of
0.1
mm, the number indicates ten times the size of
their length .
EX P LO D E D V I EWS A N D PA RTS L I ST
�
of
S h•pe
thr••d
( I n
caplt•I 18tt•rt)
� G
M•t•rl•I
h••d
tt
ro
( I n
•
)
c•plt•I l•tt8rt)
I
� ir ir '&
y
N
Nickel silver
Cast brass
z
A
Aluminum
Zinc alloy
Polycarbonate
K
Slotted-cro11
recH1ed
P, (
0-
hHd
h .. d
F
10
mm, three digits
For machine screws used in
S E C T I O N 4
� �
L • ngth
Nomln•I d lam•t•r
( In flgur•)
( In flgur•)
screw
Sh•pe of
h•ad (MCOnd digitl
0
B
Brazier head
H
Binding head
Oval countersun k head
P
Pan head
R
Round head
S
Flat head
T
Truss head
- Sh•pe of screw hud (second digitl -
t -- if · · · if - - - � --- * · - - if- · · t · · t -- cfr 1
Sh•pe of thread (fourth digitl
P
Cross recessed head screws
( - ) Slotted head machine screws
X Slotted-cross recessed head machine sc rews
H
K
Cross recessed head machine screws for precision equipment (type
A
Cross recessed head tapping screws (type
c
B
E
Cross recessed head special tapping screws (brand : evertight)
F
G
·· ·�
T
-),
H
X, K,
G
Surf- trHtment (ninth digit}
Z
Oichromate treatment after galvanizing (MF Zn Il·CI
Il .
N
N ickel plating (MF Ni Il , M F N i
G
R
Chromium plating (MBCr
Silver plating (SP4)
B
Black coating after plating
F
B l ac kening of iron ( F BI
M
Blackening after galvanizing
K
Pickling of brass ( P F 2 )
P
Phosphate treatment
W Uni-chrome plating
Coated with transparent paint
L
A Colored red after galvanizing (M FZn JI-Cl
C
Colored blue after galvanizing (MFZn JI-Cl
T
Colored green after galvanizing (MFZn JI-Cl
V
Colored purple after galvanizing (MF Zn JI-C)
�
e
r e
me n
u
rf
S
ac
t
a
t
t
( i n
c•pltal l•ttu1)
W Washer head (machine screws)
X Toothed head
1 )
(type
31
1 1
(type 2)
(type
31
(brand : P-tightl
(brand : taptight)
c
B
�
T
I I
I I
MBCr
eng
L
t
h
4-1
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