Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois

60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com

Mechanical Encoders

0.125"

Diameter

Shaft

All dimensions and rear view not shown for

the .250" diameter shaft type are the same

as the .125" diameter shaft type.

Rear mounting

plate stamping

indicates CODED

output terminals,

not decimal

positions.

Grayhill part number and date code marked on label. Customer part number marked on request.

CODE AND TRUTH TABLE

Output

Decimal Position

Terminal

0

1

2

3

4

5

6

7

8

9

1

*

****

2*

*

*

*

4*

*

*

*

8*

*

l Indicates contact is made to the common.

SPECIFICATIONS

Electrical Rating

Rated: To make and break 125 mA at 30 Vdc

resistive at standard conditions

Life Expectancy: 25,000 cycles at rated load;

50,000 cycles mechanical. For ratings at different

loads and conditions, contact Grayhill.

Contact Resistance: 100 milliohms maximum

(50 milliohms initially)

Insulation Resistance: As measured between

mutually insulated parts

Initially:

50,000 megohms minimum

After Life:

10,000 megohms minimum

Voltage Breakdown: 500 Vac between mutually

insulated parts

Carry Current: These switches will carry 3

amperes with a maximum contact temperature

rise of 20°C.

OPTIONS

Shaft and Panel Seal

Shaft is sealed by o-ring inside the bushing;

panel is sealed by o-ring at the base of the

bushing. Seals do not alter dimensions as

shown in the drawing when switch is mounted.

Panel seal is silicone rubber. Shaft seal is an

o-ring per MIL-P-5516B. Shaft and panel seal

is not available on adjustable stop switch.

Additional Characteristics

Rotational Torque: 8 to 16 oz-in.

Contacts: Non-shorting wiping contacts

Shaft Flat Orientation: As shown in the drawing,

switch would provide a decimal 1 output.

Materials and Finishes

Base: Diallyl per MIL-M-14

Rotor Mounting Plate: Thermoplastic.

Rotor Contact: Phosphor Bronze, gold-plated

30 microinches minimum

Terminals: Brass, gold plate (20 microinches)

minimum over silver plate (300 microinches)

minimum

Additional Materials: Other switch materials

and finishes are the same as listed for the

standard switch. See Standard Switch.

Adjustable Stop Switches

Adjustable stop switch lets you limit the number

of positions. Remove and relocate pins in the

front plate. A sticker holds the pins in place.

With the exception of holes in the front plate, all

dimensions, ratings, and characteristics are

the same as the other Series 71 coded switches.

For diagrams, see Standard Switch.

Available from your local Grayhill Distributor.

For prices and discounts, contact a local Sales

Office, an authorized local Distributor or Grayhill.

ORDERING INFORMATION

Shaft Diameter

Part

And Description

Number

1/8" Continuous Rotation

71AY23401

1/8" Cont. Rot., Sealed

71AY23402

1/4" Continuous Rotation

71BY23403

1/4" Cont. Rot., Sealed

71BY23404

1/8" Adjustable Stops

71AD36-3118

1/4" Adjustable Stops

71BD36-3119

SERIES 71

Binary Code

FEATURES

• 25,000 Cycles at 125 mA

• Optional Seal Versions

• Adjustable Stop Versions

OF

BUSHING

FLATS

C

L

.094 ± .010

(2,39 ± 0,25)

OF SHAFT

FLAT

C

L

.203 ± .005

(5,16 ± 0,13)

.687 ± .015

(17,45 ± 0,38)

DIA.

.562 ± .015

(14,27 ± 0,38)

1/4 32-UNEF-2A

THREAD

.125 + .001/ –.002

(3,18 + 0,03/ –0,05)

.031 (0,79)

REF.

.761 ± .046

(19,33 ± 1,17)

.312 ± .020

(7,92 ± 0,51)

.375 ± .020

(9,53 ± 0,51)

.250 ± .020

(6,35 ± 0,51)

.500 ± .015

(12,7 ± 0,38)

DIA.

SEE

DETAIL A

.750 ± .020

(19,05 ± 0,51)

OVER TERMINALS

72˚

SHAFT IS

SHOWN

IN POSITION 1

OF

BUSHING

KEYWAY

C

L

.219 ± .004

(5,56 ± 0,10)

OF SHAFT

FLAT

C

L

72°

.250 + .001/ –.002

(6,35 + 0,03/ –0,05)

3/8 32-UNEF-2A

THREAD

BUSHING KEYWAY

.066 ± .002 (1,68 ± 0,05) WIDE

BY .036 ± .003 (0,91 ± 0,08)

FROM A .375 (9,53) DIAMETER

Detail A

.068 ± .005

(1,73 ± 0,13)

.034 ± .003

(0,86 ± 0,08)

SHAFT IS

SHOWN

IN POSITION 1

0.250"

Diameter

Shaft

Encoder

9