Product Overview
Clarostat 43C2-2K Wirewound Panel Control, 2K Ohm, Unused New Old Stock
Condition
Unused, new old stock. The plated steel can is bright with light circular finishing marks from manufacture and no corrosion, and the back is stamped 43C2-2K over a second factory number, 625-7401. The front plate carries the embossed CLAROSTAT name, and MADE IN USA is embossed on the shaft-end plate. All three solder lugs are clean and unsoldered, the brass center lug still gold-bright against the two tinned outer lugs. The screwdriver-slotted shaft sits centered in the threaded bushing, and the hex mounting nut and internal-tooth lockwasher are shown fitted on the bushing in the photos. Laid on the PartsMine millimeter rule with the back of the can on zero, the part with its nut in place stops just short of the 40 mm mark.
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Product Overview
The Clarostat 43C2-2K is a single-turn wirewound potentiometer built for panel mounting: a 2K ohm element in a plated steel can, a threaded bushing with a screwdriver-slotted shaft, and three solder lug terminals for hand wiring. Mechanical rotation is roughly 300 degrees and operating torque is listed at 0.5 to 6 oz-in. Wirewound elements are the reason a control like this shows up in instrumentation and calibration work rather than in a consumer volume knob, since the resistance holds its character through heat and time in a way carbon composition does not. This is a US-built piece, marked MADE IN USA on the front, with 43C2-2K as the ordering number and 625-7401 stamped underneath it as a secondary factory marking.
Key Features
- Brand: Clarostat
- Model: 43C2-2K, back of can also stamped 625-7401
- Resistance: 2K ohm
- Type: single-turn wirewound potentiometer
- Rotation: approximately 300 degrees mechanical
- Shaft: slotted, 0.25 in diameter by 0.5 in long
- Bushing length: 0.375 in
- Body diameter: 1.094 in
- Operating torque: 0.5 to 6 oz-in
- Terminals: three solder lugs, brass center wiper lug, tinned outer lugs
- Mounting: panel mount, hex nut and internal-tooth lockwasher shown fitted on the bushing
- Marked MADE IN USA
- Quantity: one piece, condition unused new old stock
Applications
- A restorer rebuilding a tube-era test set who needs a wirewound control that matches the original panel hardware instead of a modern plastic pot
- An instrument technician swapping out a scratchy control on a bench supply or calibration fixture
- A lab engineer setting a bias or reference trim behind a front panel where the adjustment gets made with a screwdriver and then left alone
- A machine builder adding a manual setpoint control to a relay-logic panel that is wired by hand, not by connector
Frequently Asked Questions
What resistance and how far does the shaft turn?
2K ohm, single turn, with roughly 300 degrees of mechanical rotation. The taper is not marked on the part and we do not claim one. Not confirmed - verify against the datasheet before use if your circuit depends on a specific law.
What is the 625-7401 number stamped under the part number?
It is a second factory marking punched into the back of the can, directly below 43C2-2K. We have not matched it to a published cross-reference, so treat 43C2-2K as the number to order and search by, and 625-7401 as a useful confirmation that you are looking at the same part we photographed.
Does it come with mounting hardware?
The photos show the hex mounting nut and an internal-tooth lockwasher already on the threaded bushing, and it ships exactly as photographed. No knob is included, and the shaft is slotted for a screwdriver.
How do I check that it fits my panel?
Use the fourth photo. The part is laid on the PartsMine millimeter rule with the back of the can sitting on zero, so you can read the overall depth, the can, the bushing and the nut against a real scale rather than trusting a spec sheet. The two mounting ears with holes are visible in the same shot if your panel uses an anti-rotation pin.
Why buy this one photographed piece instead of chasing a surplus lot?
There is exactly one of these here, and you can see all of it before you commit. Four photographs cover the stamped back, the embossed front plate, the lug side and a millimeter rule, so the markings, the plating and the size are settled before it ships. An auction lot or a mystery bag of pots might contain a 2K wirewound panel control, or it might contain forty carbon pots, a knob nobody wanted and a freight bill. Shipping here is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Two stampings on a steel can, 43C2-2K on top and 625-7401 underneath, from the era when a control got its part number and its country of origin punched into metal instead of printed on a label. The slot in the shaft is still clean, and what it sets next is up to you.
