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Features

Available in a variety of pin-out

configurations

Virtually infinite electrical circuit isolation

Metal or plastic shaft options

RoHS compliant*

Model 91, 92, 93, 94 & 95 – 5/8 ˝ Square Single-Turn Panel Control

Initial Electrical Characteristics

Conductive Plastic Element

Cermet Element

Standard Resistance Range

Linear Tapers (A, B, E, & H) ........................(B & E) 1 K ohms to 1 megohm........................(A & H) 100 ohms to 1 megohm

Audio Tapers (C, D, F, G, S, & T) ................(D,G,S, & T) 1 K ohms to 1 megohm ...............(C & F) 1 K ohms to 1 megohm

Total Resistance Tolerance...............................10 % or 20 % ....................................................5% or 10%

Independent Linearity .......................................±5 % .................................................................±5 %

Absolute Minimum Resistance .........................2 ohms maximum ............................................. 2 ohms maximum

Effective Electrical Angle ..................................(Linear tapers) 240 ° ± 5 ° ................................(Linear tapers) 240 ° ± 6 °

(Audio tapers) 225 ° ± 5 ° .................................(Audio tapers) 225 ° ± 6 °

Contact Resistance Variation ...........................±1 % .................................................................±1 % or 3 ohms (whichever is greater)

Dielectric Withstanding Voltage (MIL-STD-202, Method 301)

Sea Level ....................................................1,500 VAC minimum .........................................1,500 VAC minimum

70,000 Feet .................................................500 VAC minimum ............................................500 VAC minimum

Insulation Resistance (500 VDC) .....................1,000 megohms minimum ................................1,000 megohms minimum

Power Rating (Voltage Limited By Power Dissipation or 350 VAC, Whichever Is Less)

+70 °C Single Section Assembly ................(Linear tapers) 1 watt .......................................(Linear tapers) 2 watts

(Audio tapers) 0.5 watt .....................................(Audio tapers) 1 watt

+70 °C Multiple Section Assembly ..............(Linear tapers) 0.5 watt/section ........................(Linear tapers) 1 watt/section

(Audio tapers) 0.25 watt/section .......................(Audio tapers) 0.5 watt/section

+125 °C .......................................................0 watt ................................................................0 watt

Theoretical Resolution ......................................Essentially infinite .............................................Essentially infinite

Environmental Characteristics

Operating Temperature Range .......................... -40 °C to +125 °C ............................................... -40 °C to +125 °C

Storage Temperature Range ............................. -55 °C to +125 °C ............................................... -55 °C to +125 °C

Temperature Coefficient Over Storage

Temperature Range ......................................... ±1,000 ppm/°C ................................................... ±150 ppm/°C

Vibration (Single Section) .................................. 15 G .................................................................... 15 G

Total Resistance Shift ................................... ±2 % maximum .................................................. ±2 % maximum

Voltage Ratio Shift ........................................ ±5 % maximum .................................................. ±5 % maximum

Shock (Single Section)....................................... 30 G .................................................................... 30 G

Total Resistance Shift ................................... ±2 % maximum .................................................. ±2 % maximum

Voltage Ratio Shift ........................................ ±5 % maximum .................................................. ±5 % maximum

Load Life............................................................. 1,000 hours ........................................................ 1,000 hours

Total Resistance Shift ................................... ±10 % maximum ................................................ ±5 % maximum

Rotational Life (No Load) ................................... 100,000 cycles ................................................... 100,000 cycles

Total Resistance Shift ................................... (Linear tapers) 10 ohms or ±15 % TRS max. .... (All tapers) ±5 % TRS max.

(whichever is greater)

(Audio tapers) ±20 % maximum

Contact Resistance Variation

@ 50,000 cycles ........................................... (Linear tapers) ±2 %........................................... ±2 %

(Audio tapers) ±3 % ........................................... ±3 %

Moisture Resistance (MIL-STD-202, Method 103, Condition B)

Total Resistance Shift ................................... (Linear tapers) ±10 % TRS maximum ............... (All tapers) ±5 % TRS maximum

(Audio tapers) ±20 % TRS maximum

Insulation Resistance (500 VDC) ................. 100 megohms minimum..................................... 100 megohms minimum

IP Rating ............................................................ IP 40 ................................................................... IP 40

Moisture Sensitivity Level .................................. 1.......................................................................... 1

ESD Classification (HBM) .................................. N/A...................................................................... N/A

WARNING

Cancer and Reproductive Harm

www.P65Warnings.ca.gov

*RoHS Directive 2015/863, Mar 31, 2015 and Annex.

Specifications are subject to change without notice. Users should verify actual device performance in their specific

applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the

last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.

Model 91, 92, 93, 94 & 95 – 5/8 ˝ Square Single-Turn Panel Control

Mechanical Characteristics

Stop Strength (1/4 ˝ D shaft) .............................................................................................................................................45.19 N-cm (4 lb.-in.)

(1/8 ˝ D shaft) ............................................................................................................................................33.89 N-cm (3 lb.-in.)

Mechanical Angle ................................................................................................................................................................................300 ° ±5 °

Torque

Starting .......................................................................................................................................... 0.3 max. above average running torque

Running Torque

Single or Dual Section (A & R Bushings) ...................................................................................... 0.21 to 1.06 N-cm (0.3 to 1.5 oz.-in.)

Single or Dual Section (C & U Bushings) ..................................................................................... 0.14 to 1.06 N-cm (0.2 to 1.5 oz.-in.)

Mounting .............................................................................................................................................1.7-2.0 N-m (15-18 lb.-in.) maximum

Variation ......................................................................................................................0.35 N-cm (0.5 oz.-in.) maximum in 45 ° shaft travel

Weight (Single Section, Metal Bushing) .............................................................................................................................12.7 grams nominal

(Each Additional Section) ...................................................................................................................................................4 grams nominal

Terminals .................................................................................................................................Printed circuit terminals, J-Hooks or solder lugs

Soldering Condition ............................................Recommended hand soldering using Sn95/Ag5 no clean solder, 0.025 ˝ wire diameter.

Maximum temperature 399 °C (750 °F) for 3 seconds. No wash process to be used with no clean flux.

Marking ............................................................................Manufacturer’s trademark, date code, resistance, manufacturer’s part number.

Ganging (Multiple Section Potentiometers) ............................................................................................................................ 2 cups maximum

Hardware.....................................One lockwasher and one mounting nut is shipped with each potentiometer (Bushing A: H-37-2 & H-38-2;

Bushing C: H-37-1 & H-38-1; Bushing R: H-37-4 & H-38-9; Bushing U: H-37-3 & H-38-8)

NOTE: Performance specifications do not apply to units subjected to printed circuit board cleaning procedures.

Electrical

specifications tested at 200 RPM, at room ambient: +25 °C nominal.

Specifications are subject to change without notice.

Users should verify actual device performance in their specific applications.

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.

Model 91, 92, 93, 94 & 95 – 5/8 ˝ Square Single-Turn Panel Control

Product Dimensions

MOUNTING

SURFACE

12.70 ± .229

(.500 ± .009)

0.79 ± .025

(.031 ± .010)

22.86 ± 0.43

(.900 ± .017)

DIA.

13.72 ± 0.38

(.540 ± .015)

1.37 ± 0.08

(.054 ± .003)

2.36 ± 0.08

(.093 ± .003)

15.88

(.625)

7.92

(.312)

.79

(.031) 2 PLCS.

3 2 1

.254

(.010)

GAP

5.08

(.20)

SEE

HOW TO ORDER

CHART FOR

BUSHING OPTIONS.

10.16 ± 0.30

(.400 ± .012)

1.19

(.047)

“A” STYLE

A.R. LUG

9.53

(.375)

15.29 ± 0.56

(.602 ± .022)

1.52

(.06)

11.05 ± 0.20

(.435 ± .008)

SEE

FOR SHAFT

OPTIONS.

2.54

(.100)

2.54

(.100)

0.81 ± 0.05

(.032 ± .002)

22.86 ± 0.43

(.900 ± .017)

MOUNTING

SURFACE

12.70 ± .229

(.500 ± .009)

0.79 ± .025

(.031 ± .010)

DIA.

13.72 ± 0.38

(.540 ± .015)

1.37 ± 0.08

(.054 ± .003)

2.36 ± 0.08

(.093 ± .003)

15.88

(.625)

7.92

(.312)

3 2 1

1.52

(.06)

GAP

.81

(.032)

R. MAX.

5.33 ± .76

(.21 ± .03)

3.81

(.150)

MAX. TYP.

DIA.

0.81 ± 0.05

(.032 ± .002)

10.16 ± 0.30

(.400 ± .012)

SEE

HOW TO ORDER

CHART FOR

BUSHING OPTIONS.

5.08 ± 0.38

(.200 ± .015)

11.05 ± 0.20

(.435 ± .008)

SEE

FOR SHAFT

OPTIONS.

1.19

(.047)

“A” STYLE

A.R. LUG

9.53

(.375)

12.7 ± 1.02

(.500 ± .040)

2.54

(.100)

2.54

(.100)

120 ° ± 5 ° STD.

FLAT ORIENTATION

(SHAFT AT CCW END)

0.81 ± 0.05

(.032 ± .002)

CCW

POTENTIOMETER

5.08 ± 1.02

(.200 ± .040)

4.45 ± .38

(.175 ± .015)

10.16

(.40)

5.59 ± .20

(.220 ± .008)

4.45 ± .38

(.175 ± .015)

DIMENSIONS:

2.54

(.100)

2.54

(.100)

2.03

(.080)

3 PLCS.

.41

(.016)

2.29

1.02

(.040) WIDE X (.090) LONG

3 PLCS.

(INCHES)

.381

TOLERANCES EXCEPT AS SHOWN: DECIMAL .XXX ± (.015 )FRACTION ± 1/64

9.65

.XX ±

ANGLE ±5 °

(.38)

Specifications are subject to change without notice.

Users should verify actual device performance in their specific applications.

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.

Model 91, 92, 93, 94 & 95 – 5/8 ˝ Square Single-Turn Panel Control

Product Dimensions

Plastic

Shaft

Styles

SHAFT TYPE "B"

(USES BUSHING A)

1.60+.38/-.00

(.063+.015/-.000)

6.32+.000/-.152

(.249+.000/.006)

DIA.

22.23

(.875)

SHAFT TYPE "D"

(USES BUSHING C)

3.16+.00/-.15

DIA.

(.1245+.000/-.006)

SHAFT TYPE "T"

(USES BUSHING U)

1.50 ± .25

(0.06 ± .001)

.79

(0.03)

STD. LENGTHS:

16.0

(.630)

22.0

(.866)

1.19

(.047)

STD. LENGTHS:

15.88

19.05

(.625) (.750)

12.70

(.500)

STD. LENGTHS:

12.70

15.88

19.05

(.500) (.625) (.750)

3.988 +0.000/-0.051

(.157 +.000/-.002)

DIA.

SHAFT TYPE "C"

(USES BUSHING A)

11.18 ± .38

(.440 ± .015)

SHAFT TYPE "R"

(USES BUSHING R)

1.80 ± .25

(0.07 ± .001)

5.994 +0.000/-0.051

(.236 +.000/-.002)

DIA.

1.00

(.04)

STD. LENGTHS:

16.0

(.630)

22.0

(.866)

SHAFT TYPE "W"

(USES BUSHING A)

14.27 ± .25

(.562 ± .010)

6.31+.025/-.051

(.2485+.001/.002)

DIA.

STD. LENGTHS:

25.40

(1.00)

5.49

(.216)

STD. LENGTHS:

19.05

22.23

(.750) (.875)

6.30+.000/-.152

(.248+.000/.006)

DIA.

48 TOOTH

Metal

Shaft

Styles

SHAFT TYPE "A"

(USES BUSHING A)

6.32+.010/-.025

(.2490+.0004/.0010)

DIA

SHAFT TYPE "H"

(USES BUSHING A)

“F” ± .38

(“F” ± .015)

6.32+.010/-.025

(.2490+.0004/.0010)

DIA

5.486 ± .051

(.216 ± .002)

25.4

(1.000)

SHAFT TYPE "S"

(USES BUSHING R)

“F” ± .381

(“F” ± .015)

6.000+.000/-.035

(.2362+.0000/.0014)

DIA

3.988 ± .076

(.157 ± .003)

STD. LENGTHS:

16.0

(.630)

22.0

(.866)

STD. LENGTHS:

12.70

(.500)

15.88

(.625)

19.05

(.750)

22.23

(.875)

STD. LENGTHS:

19.05

(.750)

7.95

(.313)

22.23

(.875)

11.13

(.438)

FLAT LENGTH “F”:

6.99

(.275)

12.98

(.511)

SHAFT TYPE "E"

(USES BUSHING C)

0.79 ± 0.25

(.031 ± .010)

0.79

(.031)

STD. LENGTHS:

12.0

(.500)

16.0

(.625)

19.0

(.750)

3.16

(.1245)

DIA

SHAFT TYPE "J"

(USES BUSHING R)

1.80 ± 0.25

(.071 ± .010)

6.00+.000/-.035

(.2362+.0000/.0010)

DIA

SHAFT TYPE "V"

(USES BUSHING U)

1.50 ± 0.25

(.059 ± .010)

0.79 ± 0.13

(.031 ± .054)

STD. LENGTHS:

16.0

(.630)

22.0

(.866)

3.99+.000/-.035

(.1571+.0000/.0010)

DIA

1.00 ± 0.13

(.039 ± .054)

STD. LENGTHS:

SHAFT TYPE "G"

(USES BUSHING A)

1.60+.38/-.00

(.063+.015/-.000)

6.32+.010/-.025

(.2490+.0004/.0010)

DIA.

1.194

(.047)

12.70

(.500)

STD. LENGTHS:

15.88

19.05

(.625) (.750)

22.23

(.875)

16.0

(.630)

22.0

(.866)

TOLERANCES EXCEPT AS SHOWN: .XX = ±

.02

(.050)

.005

.XXX = ±

(.127)

.0005

.XXXX = ±

(.0127)

DIMENSIONS:

(INCHES)

Specifications are subject to change without notice.

Users should verify actual device performance in their specific applications.

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.

Model 91, 92, 93, 94 & 95 – 5/8 ˝ Square Single-Turn Panel Control

Suggested Panel Layout

OPTIONAL:

7.75

(.305)

DIM A

Hardware

LOCKWASHER H-37-1

6.6

(.26)

NUT H-38-1

9.53 +0/-0.38

(.375 +0/-.015)

2.36 ± 0.25

(.093 ± .01)

2.79

DIA.

(.110)

1/4-32 UNEF

BUSHING

DIMENSIONS:

DIM A

9.91

(.39)

12.07 ± 0.25

(.475 ± .01)

LOCKWASHER H-37-2

9.58 ± 0.36

(.377 ± .014)

0.64 ± 0.05

(.025 ± .002)

NUT H-38-2

11 +0/-0.43

(.433 +0/-.017)

30 ° ± 5 °

TYP.

6.73

(.265)

10.5

(.413)

7.5

(.295)

(INCHES)

2.36 ± 0.25

(.093 ± .01)

3/8-32 NEF-2B

12.52 ± 0.36

(.493 ± .014)

LOCKWASHER H-37-3

7.24 ± 0.38

(.285 ± .015)

0.56 ± 0.05

(.022 ± .002)

NUT H-38-8

10 ± 0.2

(.394 ± .008)

14.66 +0/-0.43

(.577 +0/-.017)

30 ° ± 5 °

Date Code Description

YYWWM

M = COUNTRY OF MANUFACTURE

(MEXICO)

WW = WEEK NUMBER

YY = LAST TWO DIGITS OF YEAR

MANUFACTURED

2 ± 0.2

(.079 ± .008)

M7 x .75

12.45 ± 0.38

(.490 ± .015)

LOCKWASHER H-37-4

10.41 ± 0.38

(.410 ± .015)

0.71 ± 0.18

(.028 ± .007)

NUT H-38-9

14 ± 0.2

(.551 ± .008)

30 ° ± 15 °

TYP.

2.9 ± 0.2

(.114 ± .008)

M10 x .75

15.11 ± 0.51

(.595 ± .020)

0.56 ± 0.05

(.022 ± .002)

30 ° ± 15 °

TYP.

DIMENSIONS:

(INCHES)

Specifications are subject to change without notice.

Users should verify actual device performance in their specific applications.

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.