Series RA20 And RA30 Wirewound Potentiometers

• List of Popular MIL-R-19 standard RA20 and RA30 Wirewound Potentiometers.
• List of Popular Commercial 43C and 58C Wirewound Potentiometers.
• Wirewound Potentiometers Part Number Breakdowns.

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Looking for high quality American-made wire-wound potentiometers? The Clarostat series 43 meets MIL-R-19 standards. These 2 Watt wire-wound controls are made to the military specs RA20 series. These potentiometers run in ohmages from 1 ohm to 50K ohms. Taper is linear except when otherwise specifically noted. These wire-wound controls come in bushing both locking and non-locking. The typical locking shaft has 1/2 locking bushing with a 1/8 inch slotted shaft. You can get a 3/8 inch shaft beyond the locking bushing by using the number RA20LASD plus the ohmage code. The commercial 2 Watt locking series is designated by 43C2 or the military version RA20LASB. These two parts are 1/2 locking bushing and 1/8 shaft. When looking for a 2 Watt non-locking wire-wound potentiometer, you will look for Clarostat series 43C1 or 43C3 and MIL-R-19 RA20NASD series. The 43C3 or RA20NASD is a 3/8 inch bushing with a 1/2 inch shaft. The 43C1 series contains a 1 5/8 inch shaft, which can be cut down in size. These series are able to handle any 1/4 inch diameter knob.

American-made industrial wire-wound controls requiring 4 Watt power can be found by using the 58C series or the military RA30 series. The wire-wound controls come in linear taper. The ohmages run from 1ohm – 75Kohm in 10% tolerance. When looking for a locking shaft, please use designation RA30LASB or 58C2. If requiring a shaft longer than 1/8, please designate by using RA30LASD. When looking for a non-locking shaft, please use RA30NASD 1/2 inch shaft or 58C3. RA30NASA for 1/8 inch shaft 58C1 for 1 5/8 inch shaft (able to be cut down).