Speed Pots | McMaster-Carr

	Maximum Resistance Maximum Resistance

	Actuator Style Actuator Style


Rotary	Lever

Push Button

	Number of Turns Number of Turns

	Wattage Wattage

	For Panel Cutout Diameter For Panel Cutout Diameter

	Wire Connection Type Wire Connection Type


Screw Terminals	Solder

	Number of Terminals Number of Terminals

	Environment Environment

	Environmental Rating Environmental Rating

	Maximum Voltage Maximum Voltage

500V AC

500V DC

	Housing Material Housing Material

Plastic

Metal

	Specifications Met Specifications Met

CSA

CE Marked

	Actuator Diameter Actuator Diameter

7/8"

1 1/8"

	Shaft Diameter Shaft Diameter

1/8"

1/4"

	Diameter Diameter

	For Maximum Panel Thickness For Maximum Panel Thickness

	Actuator Color Actuator Color

	Black
	White

	Shaft Length Shaft Length

5/16"

3/8"

1/2"

	Depth Behind Panel Depth Behind Panel

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	Head Diameter Head Diameter

1/2"

7/8"

1 13/16"

	Hole Diameter Hole Diameter

19 Products

Harsh Environment Potentiometers

Metal

Plastic

Rated NEMA 4X and 13, these potentiometers are protected from debris, washdowns, and oil/coolant spraying. Also known as variable output switches or rheostats, they vary electrical flow to control speed, volume, and light intensity.

					Actuator
Wattage @ Voltage	Max. Voltage	For Panel Cutout Dia.	Dp. Behind Panel	No. of Turns	Dia.	Material	Wire Connection Type	Environmental Rating	Specifications Met	Choose a Max. Resistance		Each
Metal
2 W @ 120 V AC/ 2 W @ 24 V DC	500V AC/500V DC	1 3/16" (30 mm)	1 3/4"	1	1 1/8"	Plastic	Screw Terminals	NEMA 4X, NEMA 13, IP66	UL Listed, C-UL Listed, CSA Certified, UL 508	50 ohms, 250 ohms, 500 ohms, 1 kilohms, 2.5 kilohms, 5 kilohms, 10 kilohms, 15 kilohms, 25 kilohms, 100 kilohms, 500 kilohms, 2 megohms, 5 megohms	0000000	0000000
Plastic
2 W @ 120 V AC/ 2 W @ 24 V DC	500V AC/500V DC	7/8" (22 mm)	2 1/4"	1	1 1/8"	Plastic	Screw Terminals	NEMA 4X, NEMA 13, IP65	UL Listed, C-UL Listed, CE Marked	1 kilohms, 2.5 kilohms, 5 kilohms, 10 kilohms	000000	00000

Potentiometers

Vary electrical flow to control speed, volume, and light intensity. The number of turns affects the resolution—the higher the number, the better the control. Also known as variable output switches or rheostats. A knob is required (not included).

Switches with ball bearings have a smoother rotation and a longer service life than other potentiometers.

Switches

						Shaft
	No. of Turns	Wattage	For Panel Cutout Dia.	Dp. Behind Panel	Dia.	Dia.	Lg.	Housing Material	Wire Connection Type	No. of Terminals	Environmental Rating	Choose a Max. Resistance, kilohms		Each
A	10	2 W @ 325 V AC	7/16"	1"	7/8"	1/4"	1/2"	Plastic	Solder Lugs	3	IP65	1, 5, 10	0000000	000000
A	10	2 W @ 447 V AC	7/16"	3/4"	7/8"	1/4"	1/2"	Plastic	Solder Lugs	3	IP40	1, 5, 10	0000000	00000
A	10	2 W @ 450 V AC	7/16"	3/4"	7/8"	1/4"	1/2"	Plastic	Solder Lugs	3	IP40	1, 5, 10	0000000	00000
A	5	1.5 W @ 273 V AC	7/16"	3/4"	7/8"	1/4"	1/2"	Plastic	Solder Lugs	3	IP40	1, 5, 10	0000000	00000
B	1	1 W @ 300 V AC	7/16"	7/16"	7/8"	1/4"	1/2"	Plastic	Solder Lugs	3	IP40	1, 5, 10	0000000	00000
C	10	5 W @ 1,000 V AC	7/16"	1 3/4"	1 13/16"	1/4"	1/2"	Plastic	Solder Lugs	3	IP40	1, 5, 10	0000000	000000

Black Panel Seal	000000000	Each	00000
Gray Panel Seal	00000000	Each	0000

Switches with Ball Bearings

						Shaft
	No. of Turns	Wattage	For Panel Cutout Dia.	Dp. Behind Panel	Dia.	Dia.	Lg.	Housing Material	Wire Connection Type	No. of Terminals	Choose a Max. Resistance, kilohms		Each
D	1	2 W @ 350 V AC	7/16"	5/8"	2"	1/4"	3/8"	Plastic	Solder Lugs	3	1, 5, 10	0000000	0000000

Black Panel Seal	000000000	Each	00000
Gray Panel Seal	00000000	Each	0000

Switches with On/Off Controls

			Switching					Shaft
	No. of Turns	Wattage	Current	Voltage	For Panel Cutout Dia.	Dp. Behind Panel	Dia.	Dia.	Lg.	Housing Material	Wire Connection Type	No. of Terminals	Environmental Rating	Choose a Max. Resistance, kilohms		Each
E	1	0.125 W @ 350 V AC	1.5A	12V DC	3/16"	1/4"	7/16"	1/8"	5/16"	Metal	Solder Lugs	5	IP40	5, 10, 20, 25	000000	000000

Digital Potentiometers

More precise than analog potentiometers, these have a three-digit display that is easy to read. Also known as variable output switches or rheostats, they vary electrical flow to control speed, volume, and light intensity.

Push Button

Potentiometers
		For Panel Cutout									Covers
Wattage	No. of Digits	Ht.	Wd.	Dp. Behind Panel	Housing Material	Wire Connection Type	No. of Terminals	Choose a Max. Resistance, kilohms		Each		Each
2 W @ 500 V AC	3	13/16"	1 7/16"	1 3/8"	Plastic	Solder Lugs	3	1, 5, 10, 20	0000000	000000	0000000	000000

Rotary

Knob

Wattage	No. of Digits	No. of Turns	Dia.	For Panel Cutout Dia.	Dp. Behind Panel	Housing Material	Wire Connection Type	No. of Terminals	Choose a Max. Resistance, kilohms		Each
1.5 W @ 385 V AC	3	10	1 1/4"	1"	5/8"	Plastic	Solder Lugs	3	1, 5, 10	0000000	0000000

Turn-Counting Indicating Knobs

For monitoring the number of shaft turns on instrumentation, these knobs have easy-to-read scales or digits for quick and accurate readings. Use them on devices with round shafts. To secure these knobs in place, tighten the set screw.

Plastic knobs are a lightweight alternative to metal. They resist oil, grease, and solvents.

For technical drawings and 3-D models, click on a part number.

Head			Hole
Dia.	Ht.	Max. Knob Turns	Dia.	Dp.	Set Screw Included	Temperature Range, °F		Each
Style 5—Ribbed Grip
Black Plastic—For Round Shafts
7/8"	7/8"	15	1/8"	13/16"	Yes	Not Rated	000000	000000
7/8"	15/16"	15	1/4"	13/16"	Yes	Not Rated	0000000	00000
1 13/16"	1"	20	1/4"	15/16"	Yes	Not Rated	0000000	00000

Indicating Knobs

Control devices with round or D-shaped shafts and view settings at a glance with a pointer.

Knobs for round shafts include a set screw to secure them in place.

Aluminum knobs have mild corrosion resistance, are lightweight, and are nonmagnetic.

For technical drawings and 3-D models, click on a part number.

Head		Hole
Dia.	Ht.	Dia.	Dp.	Set Screw Included		Each
Style 8—Single Arm Grip
Black Anodized Aluminum—For Round Shafts
1/2"	1"	1/8"	1/2"	Yes	000000	000000