Model 852

www.vishay.com

Vishay Spectrol

Revision: 14-Oct-2022

2

Document Number: 57074

For technical questions, contact: sferprecisionpot@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

DIMENSIONS in inches (millimeters)

MECHANICAL SPECIFICATIONS

PARAMETER

Rotation

1080° +10° -0°

Bearing type

SERVO

Ball bearing

SCREW

Ball bearing

BUSHING

Sleeve bearing

Torque (maximums)

Servo or screw section 1

Bushing section 1

Each additional section

STARTING

1.20 oz. - in (86.4 g - cm)

1.75 oz. - in (126.0 g - cm)

0.80 oz. - in (57.6 g - cm)

RUNNING

0.80 oz. - in (57.6 g - cm)

1.25 oz. - in (90.0 g - cm)

0.60 oz. - cm (43.2 g - cm)

Mechanical runouts (maximums):

Shaft runout (TIR/in)

Pilot dia. runout (TIR)

Lateral runout (TIR)

Shaft end play

Shaft radial play

SERVO/SCREW

0.002" (0.05 cm)

0.002" (0.05 cm)

0.003" (0.08 cm)

0.005" (0.13 cm)

0.002" (0.05 cm)

BUSHING

0.002" (0.05 cm)

0.002" (0.05 cm)

0.005" (0.13 cm)

0.005" (0.13 cm)

0.003" (0.08 cm)

Weight (maximums)

Single section

Each additional section

Stop strength

3.5 oz. (99.2 g)

2.7 oz. (76.5 g)

1000 oz. - in, static (72 kg - cm)

Ganging

3 sections maximum, terminal alignment, added sections

within ± 10° of section 1 terminals

Moment of inertia

5.5 g - cm2 per section maximum

1.284

(32.61)

± 0.010

0.625

(15.88)

± 0.031

Ø 0.2497 TYP.

(6.34)

+ 0.0000

- 0.0003

Ø 2.000

(50.80)

Ø 1.875

(47.62)

+ 0.000

- 0.001

0.062

(1.57)

0.073 MIN.

(1.85)

0.093

(2.36)

MTG. FACE

0.062

(1.57)

Ø 1.812

(46.02)

± 0.015

MTG. FACE

± 0.015

0.219 TYP.

(5.56)

± 0.015

0.812

(20.62)

± 0.031

0.312

(7.92)

0.062

(1.57)

± 0.015

Ø 0.4062

(10.32)

+ 0.0000

- 0.0010

0.562

(14.27)

3/

8 - 32 UNEF - 2A

Ø 0.125

(3.18)

45°

± 10°

8 - 32 UNC - 2B 0.156

DEEP (3.96) 3

HOLES EQUALLY

SPACED ON A 1.250

Ø (31.75) B.C.

± 0.015

0.062

(1.57)

MTG. FACE

Ø 0.7500

(19.05)

+ 0.0000

- 0.0005

BUSHING MOUNT: 852B/852-1

SERVO MOUNT: 852S/852-2

SCREW MOUNT: 852C/852-3

0.301 MIN.

(7.64)

1

23

1.062 R MAX.

(26.97)

1

TOLERANCES: UNLESS OTHERWISE NOTED.

DECIMALS ± 0.005 ANGLES ± 2°

CW

SCHEMATIC

2

3

1

ADD 0.992 ± 0.010 (25.20) FOR EACH

ADDITIONAL SECTION