Ohmite Rheostats Catalog Page

72 Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax [phone] • www.ohmite.com • [e-mail]

Rheostats

(Potentiometers) Wirewound

Since all rheostats/potentiometers are electro-mechanical
devices, they are subject to mechanical wear and, therefore,
have a finite life.

D

0.25"

6.35 mm

enclosed

unenclosed

standard
shaft

0.125"

3.18 mm

0.625"

15.88 mm

B

0.25"

6.35 mm

0.078"

1.98 mm

C

0.531"

13.49 mm

0.406"

10.32 mm

shaft
locking
nut

0.094"

2.38 mm

B

D

locking
shaft

0.375"

9.53 mm

D

M M

0.25 - 20 thread for
mounting screws

0.031"

0.79 mm

2"

51 mm

B

1.563"

39.7 mm

C

holes for

no. 8 screws

Ohmic Voltage Behind panel Diameter Dimension Rotation

Model Type Watts range Core (RMS) "B" (In./mm) "D" (In./mm) "C" (In./mm) Shaft torque (±5°)
E RES/REL 12.5 1.0-15K open 305 0.688/17.46 0.875/ 22.23 0.594/15.08 1-6 oz. in. 300°
H RHS/RHL 25 1.0-25K open 500 1.375/34.93 1.560/ 39.62 0.940/23.88 0.25-0.5 lb. in. 300°
J RJS 50 0.5-50K open 750 1.375/34.93 2.31 / 58.67 1.56 /39.62 0.25-2 lb. in. 300°
G RGS 75 0.5-50K open 900 1.750/44.45 2.75 / 69.25 1.78 /45.21 0.5-2 lb. in. 300°
K RKS 100 0.5-50K open 1000 1.750/44.45 3.125/ 79.38 1.91 /48.51 0.5-2 lb. in. 300°
L RLS 150 0.5-50K open 1200 2.000 / 50.8 4.00 /101.60 2.28 /57.91 0.5-3 lb. in. 300°
P RPS 225 1.0-30K open 1300 2.125/53.98 5.00 /127.00 2.97 /75.44 2.5-4 lb. in. 310°
N RNS 300 1.0-50K open 1225 2.375/60.33 6.00 /152.40 3.44 /87.38 2.5-5 lb. in. 320°
R RRS 500 1.0-20K open 1450 2.125/53.98 8.00 /203.20 4.31/109.47 4.5-7 lb. in. 325°
U RUS 1000 1.0-20K open 1600 3.000 / 76.2 12.00 /304.80 6.38/162.05 3.5-7 lb. in. 335°
C RCS/RCL 7.5 10.0-5K enclosed 305 0.875/22.23 0.515/ 13.08 — 0.25-3 oz. in. 300°
E REE 12.5 1.0-15K enclosed 305 1.219/30.96 1.047/ 26.59 — 1-6 oz. in. 300°

• Models H, J, G, and K also available in enclosed versions.

• See Catalog #203 for complete details.
Made-to-order rheostats available: Contact nearest Ohmite sales office.

Model E

Models P, N, R, U

Models H, J, G, K, L

Dimension "M"

P 0.875" 22.23 mm
N 1.188" 30.16 mm
R 1.5" 38.1 mm
U 3" 76.2 mm

D

0.25"

6.4 mm

0.125"

3.18 mm

0.625"

15.88 mm

0.625"

15.88 mm

B

0.25"

6.4 mm

0.109"

2.78 mm

0.531"

13.49 mm

0.25"

6.4 mm

Standard
shaft

Locking
shaft

Mounting: Panels to

0.125" (3.18mm) thick

with 0.25-32 bushing and

hex nut (0.063" thick).

Mounting: Panels to 0.125" (3.18mm) thick with

0.25-32 bushing and hex nut (0.063" thick).

Mounting: Panels to 0.25" (6.35mm) thick with 0.375-32 bushing and hex nut

(0.094" thick) (or with 10-32 x 0.75 F.H. screws for model L only).

Mounting: Panels

to 1.25" (31.75mm)

thick with 0.25-20

flat-head screws.

0.5"

12.7 mm

holes for:

no. 2 screws (model H)

no. 8 screws (J, G, K, L)

mounting

bracket on

model L only

0.875"

22.23 mm

D

drill 0.188"

(4.76 mm) hole

in panel

0.25"

6.35 mm

0.031"

0.79 mm

0.344"

8.73 mm

0.031"

0.79 mm

0.063"

1.59 mm

0.375"

9.53 mm

0.875"

22.23 mm

B

C

0.75"

19.05 mm
bushing

projection

0.625"

15.88 mm

shaft

locking

nut

standard shaft

(models H, J, G, K, L)

locking shaft

(only model H

stocked)

See page 76 for knobs,

dials, and other hardware

Model C

Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax [phone] • www.ohmite.com • [e-mail] 73

0.5 –––R50 ✔ 10.0 ✜ 12.3 ✜ 14.1 ✜ 17.3
1 –––1R0 ✙ ✜✜3.53 ✔✜5.00 ✔ 7.07 ✜ 8.66 ✜ 10 ✜ 12.3 ✜ 15.0 ✜ 17.32 ✜ 22.3 ✜ 31.6

1.5 –––1R5 ✜ 18.2 ✜ 25.8
2 –––2R0 ✔✜✜2.50 ✔✜3.54 ✔ 5.00 ✜ 6.12 ✜ 7.07 ✜ 8.65 ✜ 10.6 ✜ 12.24 ✜ 15.8 ✜ 22.4

2.5 –––2R5 ✜✜✜2.24 ✜ 14.1 ✜ 20.0
3 –––3R0 ✜✜✜2.04 ✙ ✜ 2.88 ✜ 5.00 ✜ 5.75 ✜ 7.07 ✜ 8.66 ✜ 10.00 ✜ 12.9 ✜ 18.3
4 –––4R0 ✔ 3.53 ✜ 7.50 ✜ 8.66 ✜ 11.2 ✜ 15.8
5 –––5R0 ✜✜✜1.58 ✜ 3.88 ✜ 4.47 ✜ 5.48 ✜ 6.71 ✜ 7.75 ✜ 10.0 ✜ 14.1
6 –––6R0 ✜✜✜1.44 ✙ ✜ 2.04 ✙ 2.88

7.5 –––7R5 ✜ 3.16 ✜ 3.65 ✜ 4.47 ✜ 5.49 ✜ 6.32

8 –––8R0 ✙ ✜✜1.25 ✔✜1.77 ✔ 2.50 ✜ 7.90 ✜ 11.2
10 –––10R ✜✜0.86 ✔✜✜1.12 ✙ ✜ 1.58 ✜ 2.74 ✜ 3.16 ✜ 3.88 ✜ 4.74 ✜ 5.48 ✜ 10.0
12 –––12R ✔ 2.04

12.5 –––12R5 ✜ 6.30 ✜ 8.95
15 –––15R ✜✜0.71 ✜✜✜0.91 ✙ ✜ 1.29 ✜ 3.163 ✜ 3.87 ✜ 4.47
16 –––16R ✔ 1.76 ✜ 2.17 ✔ 2.50 ✜ 5.60 ✜ 7.90
22 –––22R ✔ 1.50
25 –––25R ✜✜0.55 ✙ ✜✜0.71 ✙ ✜ 1.00 ✜ 1.73 ✜ 2.0 ✜ 2.450 ✜ 3.00 ✜ 3.46 ✜ 4.47 ✜ 6.33
35 –––35R ✜✜0.46 ✔✜✜0.60 ✙ ✜ 0.845 ✙ 1.19 ✜ 2.070
40 –––40R ✜ 3.54
50 –––50R ✜✜0.39 ✔✜✜0.50 ✙ ✜ 0.707 ✙ 1.00 ✜ 1.23 ✜ 1.41 ✜ 1.735 ✜ 2.12 ✜ 2.45 ✜ 3.16 ✜ 4.47
75 –––75R ✜✜0.32 ✙ ✜✜0.40 ✙ ✜ 0.575 ✜ 1.00 ✜ 1.15 ✜ 1.415 ✜ 1.73 ✜ 2.00 ✜ 3.65
80 –––80R ✔ 0.790 ✜ 2.52

100 –––100 ✜✜0.27 ✙ ✜✜0.36 ✙ ✜ 0.500 ✜ 0.866 ✜ 1.00 ✜ 1.225 ✜ 1.50 ✜ 1.73 ✜ 3.16
125 –––125 ✔✜✜0.32 ✔✜0.445 ✙ 0.630 ✜ 2.00
150 –––150 ✜✜0.22 ✜✜✜0.29 ✙ 0.575 ✜ 1.000 ✜ 1.22 ✜ 1.41
160 –––160
175 –––175 ✔✜✜0.27 ✔✜0.375 ✜ 1.69 ✜ 2.39
200 –––200 ✜✜0.19 ✜✜✜0.25 ✜ 0.612 ✜ 0.707 ✜ 0.865 ✜ 1.06 ✜ 1.22
225 –––225 ✙ 0.470 ✜ 2.11
250 –––250 ✜✜0.17 ✙ ✜✜0.22 ✙ ✜ 0.316 ✜ 0.775 ✜ 1.41
300 –––300 ✔ 0.408 ✜ 0.500 ✜ 0.575 ✜ 0.866 ✜ 1.00 ✜ 1.83
325 –––325 ✜ 1.24
350 –––350 ✜✜0.15 ✔✜✜0.19 ✔✜0.267 ✜ 0.655
400 –––400 ✜ 0.433 ✜ 0.500 ✜ 0.750 ✜ 0.866 ✜ 1.48
500 –––500 ✜✜0.12 ✙ ✜✜0.16 ✙ ✜ 0.222 ✙ 0.316 ✜ 0.388 ✜ 0.447 ✜ 0.548 ✜ 1.00 ✜ 1.41
600 –––600
700 –––700 ✜ 0.567 ✜ 0.655
750 –––750 ✜✜0.10 ✜✜✜0.13 ✙ ✜ 0.182 ✜ 0.316 ✜ 0.365 ✜ 0.447 ✜ 0.817 ✜ 1.15
800 –––800 ✔ 0.250

900 –––900 ✜ 0.500 ✜ 0.578
1000 –––1K0 ✜✜0.086 ✙ ✜✜0.10 ✙ ✜ 0.155 ✙ 0.224 ✜ 0.274 ✜ 0.316 ✜ 0.707 ✜ 1.00
1200 –––1K2 ✜ 0.433 ✜ 0.500
1250 –––1K25 ✜ 0.346
1500 –––1K5 ✜✜0.071 ✔✜✜0.090 ✙ ✜ 0.129 ✜ 0.224 ✜ 0.258 ✜ 0.387 ✜ 0.447 ✜ 0.577 ✜ 0.816
1600 –––1K6 ✜ 0.176
1750 –––1K75 ✜ 0.358 ✜ 0.414
1800 –––1K8 ✜ 0.288
2000 –––2K0 ✜ 0.194 ✜ 0.224 ✜ 0.336 ✜ 0.387 ✜ 0.500
2250 –––2K25 ✜ 0.259
2500 –––2K5 ✜✜0.055 ✔✜✜0.070 ✙ ✜ 0.100 ✙ 0.141 ✜ 0.173 ✜ 0.200 ✜ 0.300 ✜ 0.346 ✜ 0.447 ✜ 0.633
3000 –––3K0 ✜ 0.224
3500 –––3K5 ✜✜0.046 ✜✜✜0.060 ✙ ✜ 0.084 ✔ 0.119
4500 –––4K5 ✜ 0.182
5000 –––5K0 ✜✜0.039 ✔✜✜0.050 ✙ ✜ 0.070 ✔ 0.100 ✜ 0.123 ✜ 0.141
7500 –––7K5 ✜✜✜0.041 ✔✜0.058 ✜ 0.100 ✜ 0.115 ✜ 0.141
8000 –––8K0 ✜ 0.079

10000 –––10K ✙ ✜✜0.035 ✙ ✜ 0.050 ✙ 0.070 ✜ 0.087 ✜ 0.100 ✜ 0.122
12500 –––12K5 ✜✜✜0.031
15000 –––15K ✜✜✜0.029 ✔✜0.041 ✜ 0.058
20000 –––20K ✜✜0.035 ✜ 0.050
25000 –––25K ✜✜0.032 ✜ 0.045
30000 –––30K ✜ 0.041
40000 –––40K ✜ 0.035
50000 –––50K ✔ 0.032

Ohmic value

RCS––– Std. shaft

7.5W Model C

Part No.

Prefix ➤
Suffix

STOCK PART NUMBERS FOR STANDARD RESISTANCE VALUES

RCL––– Locking

Amps max.

REL––– Locking

12.5W Model E

REE––– Enclosed

Amps max.

RES––– Std. shaft

RHS––– Std. shaft

25W Model H

RHL––– Locking

Amps max.

RJS–––

Amps max.

RGS–––

Amps max.

RKS–––

Amps max.

RLS–––

Amps max.

RPS–––

Amps max.

RNS–––

Amps max.

RRS–––

Amps max.

RUS–––

Amps max.

50W

Model J

75W

Model G

100W

Model K

150W

Model L

225W

Model P

300W

Model N

500W

Model R

1000W

Model U

✙ = Most popular stock values

✔ = Stock values
✜ = Non-stock values subject to minimum han-

dling charge per item
Rheostats are silicone-ceramic coated at and
above the following ohmic values:

Model C: all Model G: 5000
Model E: 3500 Model K: 7500
Model H: 7500 Model L: 7500
Model J: 15,000

➤