Encoder Wheels | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Wheel Circumference Wheel Circumference

	Wheel Material Wheel Material

Aluminum

Plastic

Steel

	Unit of Measure Unit of Measure

	Material Travel Direction Material Travel Direction

Backward

Forward

	Functions (Length Measurers) Functions (Length Measurers)

	Number of Wheels Number of Wheels

	Mounting Hole Diameter Mounting Hole Diameter

0.221"

3/8"

	Overall Length Overall Length

	Overall Height Overall Height

3 11/16"

6 1/2"

7 1/2"

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

DFARS Specialty Metals
COTS-Exempt

	Overall Width Overall Width

7 5/16"

19"

	Bracket Height Bracket Height

2 15/16"

6 5/16"

	Bracket Length Bracket Length

2 1/2"

7 1/4"

	Bracket Material Bracket Material

Iron

Aluminum

	Bracket Width Bracket Width

2 5/16"

2.313"

7 1/4"

	Maximum Speed Maximum Speed

2,400 fpm

3,000 fpm

4,500 fpm

	Number of Mounting Holes Number of Mounting Holes

	Maximum Length Measured Maximum Length Measured

999,999 ft.

999,999 yd.

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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

RoHS Compliant

	Batteries Required Batteries Required

Yes

	Batteries Included Batteries Included

Yes

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47 Products

Flat-Material Length Measurers

Backward Material Travel

Forward Material Travel

Measure sheets, rolls, and strips using these wheels and their attached counters.

Aluminum wheels are for high temperature processes and coarse materials such as sandpaper. The surface is knurled for good contact.

Plastic wheels are for smooth materials such as paper and cloth.

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

Measurers

One Wheel

Two Wheels

Measurers
	Max.				Overall			Mounting Holes						Replacement Wheels		Replacement Counters
Material Travel Direction	Lg. Measured	Speed, ft./min.	Wheel Circumference	Tread Wd.	Lg.	Wd.	Ht.	No.	Dia.	Ctr.-to-Ctr. Distance	Functions		Each		Each		Each
Feet
One Aluminum Wheel
Backward	999,999 ft.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	0000000	0000000	0000000	0000000	0000000
Forward	999,999 ft.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	000000	0000000	000000
Two Aluminum Wheels
Backward	999,999 ft.	4,500	18"	5/8"	5 3/4"	19"	7 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	000000	0000000	000000
Forward	999,999 ft.	4,500	18"	5/8"	5 3/4"	19"	7 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	000000	0000000	000000
One Plastic Wheel with Rubber Tread
Backward	999,999 ft.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	00000	0000000	000000
Forward	999,999 ft.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	00000	0000000	000000
Two Plastic Wheels with Rubber Tread
Backward	999,999 ft.	4,500	18"	5/8"	5 3/4"	19"	7 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	00000	0000000	000000
Forward	999,999 ft.	4,500	18"	5/8"	5 3/4"	19"	7 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	00000	0000000	000000
Feet/Inches
One Aluminum Wheel
Backward	999,999 ft.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	000000	0000000	000000
Forward	999,999 ft.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	000000	0000000	000000
One Plastic Wheel with Rubber Tread
Backward	999,999 ft.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	00000	0000000	000000
Forward	999,999 ft.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	00000	0000000	000000
Yards
One Aluminum Wheel
Backward	999,999 yd.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	000000	0000000	000000
Forward	999,999 yd.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	000000	0000000	000000
One Plastic Wheel with Rubber Tread
Backward	999,999 yd.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	00000	0000000	000000
Forward	999,999 yd.	3,000	12"	5/8"	3 13/16"	19"	6 1/2"	2	3/8"	1 1/2"	Adds Subtracts Zero Reset	0000000	000000	0000000	00000	0000000	000000

Repair Kits

Includes		Each
Handle, Shaft, Springs	0000000	00000

Replacement Parts

Component	Includes		Each
Counter Mounting Bracket	__	0000000	000000
Measurer Mounting Bracket	__	0000000	00000
Mounting Kit	Counter Mounting Bracket, Lug, Measurer Mounting Bracket, Rod	0000000	000000

Remote Readout Flat-Material Length Measurers

Measurer with Electromechanical Actuator

Send sheet, roll, and strip measurements from this measurer to a remote Voltage Actuated Counter (sold separately).

Max.			Wheel		Tread			Overall			Mounting Holes
Lg. Measured	Speed	Material Travel Direction	Circumference	Material	Material	Wd.	No. of Wheels	Lg.	Wd.	Ht.	No.	Dia.	Ctr.-to-Ctr. Distance		Each
Any	2,400 fpm	Forward/Backward	12"	Aluminum	Rubber	5/8"	1	8 5/16"	7 5/16"	3 11/16"	4	0.221"	1 1/2"	0000000	000000000

Replacement Rotary Contactors	Each	0000000
Replacement Mounting Brackets	Each	000000
Surface-Mount Electrically Actuated Counters	Each	000000
Surface-Mount Electrically Actuated Counters	Each	00000
Surface-Mount Electrically Actuated Counters	Each	00000

Distance-Measuring Wheels

Roll these wheels along a surface to measure distances up to 99,999 feet. Choose 36" circumference and larger wheels for measuring uneven surfaces.

Style E operates on a nonreplaceable battery with a minimum 10 year life.

Measuring Wheels
		Wheel						Batteries				Replacement Batteries
Style	Max. Distance	Circumference	Material	Tread Material	O'all Lg.	Folded Lg.	Functions	Required	Included		Each		Pkg.
Inches/Feet
A	9,999 ft.	12"	Plastic	Rubber	36 1/2"	18"	Adds, Zero Reset	No	No	0000000	000000	000000	00
B	9,999 ft.	12"	Plastic	Rubber	36 1/2"	18"	Adds, Zero Reset	No	No	0000000	00000	000000	00
C	9,999 ft.	39"	Aluminum	Rubber	42 1/2"	24"	Zero Reset	No	No	0000000	00000	000000	00
Feet
D	99,999 ft.	36"	Steel	Rubber	44"	23"	Adds, Zero Reset	No	No	0000000	000000	000000	00
D	99,999 ft.	48"	Steel	Rubber	44"	23"	Adds, Zero Reset	No	No	0000000	000000	000000	00
Feet/Meters/Yards
E	9,999 ft.	39 3/8"	Plastic	Rubber	40"	27"	Zero Reset	Yes	Yes	0000000	000000	000000	00
Inches/Feet/Meters
F	99,999 ft.	48"	Steel	Rubber	43"	22"	Calculates Area, Permanent Memory, Zero Reset	Yes	No	0000000	000000	00000000	00000

Optional Fabric Carrying Case for Styles C & D

000000

Each

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