Standard Keypads
SerieS 88
Sealed, Flange mounted
FeatureS
• Sealed Keyboard
• Colorful Graphic Overlay
• Audible, Snap-Dome Contact
• User Legendable Styles
• 3,000,000 Operations per Button
• Optional Panel Seal Gasket to
Protect Your Equipment
Keyboards and Keypads
DimenSionS
in inches (and millimeters)
3x4 Keyboard
.600 ± .010
(15,24 ± 0,25)
.150 ± .005
(3,81 ± 0,13) R.
.500 ± .010 (12,7 ± 0,25)
(2 EQ. SPS.) TOL. NON-
ACCUM.
SWITCH KEY
IDENTIFICATION
(FOR REF. ONLY)
.128 ± .010
(3,25 ± 0,25)
.072
± .010
(1,83
± 0,25)
.280 ± .010
(7,11 ± 0,25)
.750 ± .010
(19,05 ± 0,25)
1 2 3
4 5 6
7 8 9
10 11 12
COL 1
COL 2
COL 3
ROW 1
2.690 + .000/
- .010
(68,33 + .000/
ROW 3
- 0,25)
ROW 2
ROW 4
.500 .010
(12,7 ± 0,25)
(3 EQ. SPS)
TOL. NON-
ACCUM.
.380 (9,65)
SQ. TYP.
.105 ± .010
(2,67 ± 0,25)
.025 ± .002
(0,64 ± 0,05)
SQUARE
TERMINAL
.055 ± .010
(1,40 ± 0,25)
1.990 + .000 - .010
(50,55 + .000 - 0,25)
COL = COLUMN
.360 ± .010
(9,14 ± 0,25)
BUTTON AREAS ARE EMBOSSED
termination
3x4
in inches (and millimeters)
2.200 ± .015
(55,88 ± 0,38)
2.000 ± .010
(50,8 ± 0,25)
Code and truth table
Dots in the chart indicate connected terminals
when switch is closed. Terminals are identified on
the keyboard.
BUTTON NO. 1
.093 ± .005
(2,36 ± 0,13)
DIA. 4 PLS.
.220 ± .010
(5,59 ± 25,4)
RETAINING
STUDS
.100 ± .010
(2,54 ± 0,25)
.100 (2,54)
TYP.
3x4
1
2
3
4
5
6
7
8
9
10
11
12
CoDeS
A B C F G H L M N
3.000
± .015
(76,2
± 0,38)
2.800
± .010
(71,12
± 0,25)
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F E D K J H G
J E A K F B L G C M H D N
•
terminal loCation
matrix
Single Pole/Common Bus
.200 ± .010
(5,08 ± 0,25)
C OF 2.200 (55,88) DIM.
L
1.200
.100
TYP.
A B CDE F GHJ K L
M
N
.600
.100
TYP.
DE F GHJ
K
SINGLE POLE COMMON BUS TERMINAL
MATRIX TERMINAL PIN-OUT
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Button loCation
Standard Keypads
Sealed, Flange mounted
FeatureS
• Sealed Keyboard
• Colorful Graphic Overlay
• Audible, Snap-Dome Contact
• User Legendable Styles
• 3,000,000 Operations per Button
• Optional Panel Seal Gasket to
Protect Your Equipment
Keyboards and Keypads
SerieS 88
DimenSionS
in inches (and millimeters)
4x4 Keyboard
.600 ± .010
(15,24 ± 0,25)
.150 ± .005
(3,81 ± 0,13) R.
.500 ± .010 (12,7 ± 0,25)
(3 EQ. SPS.) TOL. NON-
ACCUM.
.128 ± .010
(3,25 ± 0,25)
SWITCH KEY
IDENTIFICATION
(FOR REF. ONLY)
.072
± .010
(1,83
± 0,25)
.280 ± .010
(7,11 ± 0,25)
.750 ± .010
(19,05 ± 0,25)
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
COL 1
COL 2
COL 3
COL 4
ROW 1
2.690 + .000/
- .010
(68,33 + .000/
- 0,25)
ROW 3
ROW 2
ROW 4
.500 .010
(12,7 ± 0,25)
(3 EQ. SPS)
TOL. NON-
ACCUM.
.380 (9,65)
SQ. TYP.
.105 ± .010
(2,67 ± 0,25)
.025 ± .002
(0,64 ± 0,05)
SQUARE
TERMINAL
.055 ± .010
(1,40 ± 0,25)
2.490 + .000 - .010
(63,25 + .000 - 0,25)
COL = COLUMN
.360 ± .010
(9,14 ± 0,25)
BUTTON AREAS ARE EMBOSSED
termination
4x4
in inches (and millimeters)
2.700 ± .010
(68,58 ± 0,25)
2.500 ± .010
(63,5 ± 0,25)
Code and truth table
Dots in the chart indicate connected terminals when switch
is closed. Terminals are identified on the keyboard.
.100 ± .010
(2,54 ± 0,25)
.100 (2,54)
TYP.
.050 ± .003
(1,27 ± 0,08)
4x4
BUTTON NO. 1
.093 ± .005
(2,36 ± 0,13)
DIA. 4 PLS.
.220 ± .010
(5,59 ± 25,4)
RETAINING
STUDS
CODES
A B E F G K L M R S T
3.000
± .015
(76,2
± 0,38)
2.800
± .010
(71,12
± 0,25)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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BUTTON LOCATION
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.200 ± .010
(5,08 ± 0,25)
H G F E M L K J
C OF 2.700 (68,58) DIM.
L
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P J E A R L F B S M H C T N G D K
TERMINAL LOCATION
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Single Pole/Common Bus
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Standard Keypads
SerieS 88
Sealed, Flange mounted
FeatureS
• Sealed Keyboard
• Colorful Graphic Overlay
• Audible, Snap-Dome Contact
• User Legendable Styles
• 3,000,000 Operations per Button
• Optional Panel Seal Gasket to
Protect Your Equipment
Keyboards and Keypads
DimenSionS
in inches (and millimeters)
5x4 Keyboard
.600 ± .010
(15,24 ± 0,25)
.150 ± .005
(3,81 ± 0,13) R.
.500 ± .010 (12,7 ± 0,25)
(4 EQ. SPS.) TOL. NON-
ACCUM.
SWITCH KEY
IDENTIFICATION
(FOR REF. ONLY)
.128 ± .010
(3,25 ± 0,25)
.072
± .010
(1,83
± 0,25)
.280 ± .010
(7,11 ± 0,25)
.750 ± .010
(19,05 ± 0,25)
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
COL 1
COL 2
COL 3
COL 4
COL 5
ROW 1
2.690 + .000/
- .010
(68,33 + .000/
- 0,25)
ROW 3
ROW 2
ROW 4
.500 .010
(12,7 ± 0,25)
(3 EQ. SPS)
TOL. NON-
ACCUM.
.380 (9,65)
SQ. TYP.
.105 ± .010
(2,67 ± 0,25)
.025 ± .002
(0,64 ± 0,05)
SQUARE
TERMINAL
.055 ± .010
(1,40 ± 0,25)
2.990 + .000 - .010
(75,95 + .000 - 0,25)
COL = COLUMN
.360 ± .010
(9,14 ± 0,25)
BUTTON AREAS ARE EMBOSSED
termination
in inches (and millimeters)
3.200 ± .010
(81,28 ± 0,25)
3.000 ± .010
(76,2 ± 0,25)
.100 (2,54)
TYP.
Code and truth table
Dots in the chart indicate connected terminals when switch is closed.
Terminals are identified on the keyboard.
BUTTON NO. 1
.093 ± .005
(2,36 ± 0,13)
DIA. 4 PLS.
.220 ± .010
(5,59 ± 25,4)
RETAINING
STUDS
5x4 Keyboard
.100 ± .010
(2,54 ± 0,25)
5x4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
CoDeS
A D E F J K L P Q R U V W
3.000
± .015
(76,2
± 0,38)
2.800
± .010
(71,12
± 0,25)
C OF 3.200 (8,13) DIM.
L
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P N K G F J L M H
T P M H D U Q L G C V R K F B W S J E A N
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terminal loCation
matrix
Single Pole/Common Bus
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Button loCation
Standard Keypads
SPeCiFiCationS
rating Criteria
rating at 24 Vdc: 10 milliamps, resistive
Contact resistance:
Compatible with MOS,
TTL and DTL (10 ohms maximum)
Voltage Breakdown: 250 Vac between mutually
insulated parts
life expectancy: 3,000,000 operations per
button
Contact Bounce: Less than 4 milliseconds at
make, 10 milliseconds at break
temperature:
-40°C to +80°C
materials and Finishes
operating Features
StanDarD legenDS
Colorful graphic overlays are polyester with
a tough acrylic bond to provide maximum
protection against dirt and moisture. Second
surface printed, the overlay wipes clean and
Button travel: 0.015"(0,38 mm) nominal total
travel
typical operating Force: 350 grams
continues to look bright and bold throughout
the keyboard life. Available through distributors.
For instant custom legends, order separate
blank keyboards as indicated in the Ordering
housing: ABS polycarbonate, black
graphic overlay: Polyester
Contact Dome:
Stainless steel, selectively
gold- plated
terminals: Phosphor bronze
Information section and choose one of the
clear window overlays below; then order a
sheet of legend inserts. Or, if you prefer, order
the keyboard custom printed by Grayhill; see
Ordering Information.
Keyboards and Keypads
-143
-152
-172
88-101
88aB2,
88aC2
-052
-072
-082
88-001
88BB2,
88BC2
-252
-262
88-201
88JB2, 88JC2
Sealing oF KeYBoarDS
The graphic legend is silk-screen printed
on the second surface of a clear polyester
film, providing maximum legend protection.
It withstands high humidity, and it is resistant
to scratching, marring, and dulling of the
surface caused by fingernails, wiping cloths,
and cleaning materials. It has excellent solvent
resistance to water, petroleum oil, alcohols
and aliphatic hydrocarbons.
These common liquids do not attack the
overlay: 5% acetic acid, 5% citric acid, 2%
detergent solution, soapy water, 30% hydrogen
peroxide, wine, beer, whiskey, coffee, cocoa, milk,
tomato juice, lemon juice, etc. Hydrocarbons,
ketones and freon do not affect the overlay.
But, we recommend that you do not subject the
keyboard to these chemicals, since they may
affect the switch housing, which is ABS plastic. To
discuss a particular solvent, contact Grayhill.
Protect your equipment in outdoor or harsh
environmental conditions by sealing the keyboard
to the equipment panel. Use an optional gasket
with the keyboard. There are two types of
gaskets: one for mounting the keyboard beneath
the panel, and one for mounting it above the
equipment panel. See Panel Seal Gaskets.
The contact system is internally sealed by a
special adhesive backed sheet that holds the
domes in position on the PC board.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Standard Keypads
Panel Seal gaSKetS
Subpanel mounting
Weatherproof and waterproof your subpanel
and topside mounted keyboards with optional
panel seal gaskets.
Subpanel keyboard gasket is .062" (1,57 mm)
thick; topside keyboard gasket is .094" (2,39
mm).
Material is cellulose fiber, foam, nitrile rubber.
Order gaskets separately from keyboard.
Keyboards and Keypads
DIM. B
DIM. D
3.200
± .005
(81,28
± 0,13)
topside mounting
DIM. C
2.710
± .005
(68,83
± 0,13)
DIM. A
2.850
± .005
(72,39
± 0,13)
2.500
± .005
(63,5
± 0,13)
Subpanel 3x4
Subpanel 4x4
Subpanel 5x4
Topside 3x4
Topside 4x4
Topside 5x4
Part no. 88m2001-2
Part no. 88m2009-2
Part no. 88m2019-1
Part no. 88m2012-1
Part no. 88m2015-1
Part no. 88m2018-1
Size of
Keyboard
3x4
4x4
5x4
Subpanel mount
Dim. a
Dim. B
2.010 ± .005
(51,05 ± 0,.13)
2.510 ± .005
(63,75 ± 0,13)
3.010 ± .005
(76,45 ± 0,13)
2.400 ± .005
(60,96 ± 0,13)
2.900 ± .005
(73,66 ± 0,13)
3.400 ± .005
(86,36 ± 0,13)
topside mount
Dim. C
Dim. D
1.800 ± .005
(45,72 ± 0,13)
2.300 ± .005
(58,42 ± 0,13)
2.800 ± .005
(71,12 ± 0,13)
2.040 ± .005
(51,82 ± 0,13)
2.540 ± .005
(64,52 ± 0,13)
3.040 ± .005
(77,22 ± 0,13)
inStant CuStom legenDS
available through Distributors
Create your own legends using these 3 items: 1)
a blank keyboard, 2) the clear window overlays
shown on Standard Legend page and 3) a sheet
of legend inserts.
Blank Keyboards
The numbers below order blank keyboards for
the user to legend. For description, refer to the
part numbering scheme below. The keyboards
and overlays are ordered separately.
3x4 Matrix
Part no. 88aB2
3x4 SP/Com Bus
Part no. 88aC2
4x4 Matrix
Part no. 88BB2
4x4 SP/Com Bus
Part no. 88BC2
5x4 Matrix
Part no. 88JB2
5x4 SP/Com Bus
Part no. 88JC2
button. Legends are printed in black on clear
film in News Gothic Condensed type style. They
include letters A through Z, numbers 0-69,
telephone legends, commonly used words,
symbols and blanks.
Part no. 87aC2046
Use matching dry transfer lettering on blank
inserts of legend sheet: upper and lower case
letters, 0-9, and common symbols.
Small Print
Part no. 87-Dt-2096-088
Medium Print
Part no. 87-Dt-2096-125
Large Print
Part no. 87-Dt-2096-187
PrinteD legenDS
not available through Distributors. For medium
volume applications, or where legends cannot
be produced by the self legend method, you
can order epoxy ink printed legends. Virtually
anything which can be photographed can be
printed. Grayhill will print your legend and then
add the clear window overlay.
type
i.D. no.
4gh088
1gh125
3gh187
2gh250
Simulated
Style & Size
ABCDEFGH
Character & line
limitations *
END
DATA
Clear Window overlays
Order separately from keyboards. See also
ordering information.
3x4 Overlay
Part no. 88-101
legend insert Sheet and Dry transfers
4x4 Overlay
Part no. 88-001
Self-adhesive inserts are die-cut to fit the 5x4 Overlay
Part no. 88-201
ABCDE
LAD
ABCD
ON
ABC
15
orDering inFormation
grayhill Series number
Size option
A = 3x4
B = 4x4
J = 5x4
Circuitry option
B2 = Matrix code
C2 = Single pole/common bus
Standard legend Choices
3x4 Size: -143, -152, or -172
4x4 Size: -052, -072 or -082
5x4 Size: -252 or -262
available from your local grayhill Distributor.
For prices and discounts, contact a local
Sales Office, an authorized local Distributor or
Grayhill.
88aB2–152
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
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