Product Overview
Grayhill 50MT36-01-2-02S Series 50 Rotary Switch - Two Position, Two Pole, Shorting, Gold Solder Lugs and a Flatted 1/8 Inch Shaft
Condition
Unused NOS. Stock is more than one, so the switch in the photographs is representative of the stock and is sold each. It was handled with gloves for the camera. The gold-plated solder lugs are clean and carry no solder, the black terminal insulator is unmarked, the threaded bushing and the flat on the shaft show no tool marks, and the orange seal ring is seated at the shoulder where the bushing meets the body. Evaluation was visual inspection only. Function testing was not performed, so contact continuity, detent action and the shorting overlap are not confirmed here. One view shows a hex nut run down the bushing against the seal ring and another shows the bushing threads bare, so mounting hardware is not confirmed with the piece you receive.
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Product Overview
Grayhill Series 50 single-deck rotary switch, part number 50MT36-01-2-02S printed on the wraparound body label along with a printed ring numbered 1 through 10 around the can. Against the millimeter scale in the first photograph the metal body measures approximately 13 mm across, the half-inch frame the Series 50 is named for, and everything about it is panel-mount hardware: a fine-threaded bushing, a flatted 1/8 inch (0.125 in) shaft, and a ring of gold-plated solder lug terminals set in a black insulator at the rear. The orange seal ring visible at the bushing shoulder is the piece a buyer looks for on this variant; the MT in the part number is generally read as process-sealed construction, but that reading is not confirmed here, so verify it against the Grayhill Series 50 datasheet before use. The catalog data carried with this part number calls out two positions, two poles, a 36 degree angle of throw and shorting (make-before-break) contact timing, rated 200 mA at 28 VDC and 150 mA at 115 VAC. Treat those ratings as published catalog figures and verify against the datasheet before use, since only the markings and the visible construction can be confirmed from the photographs. Sold each.
Key Features
- Grayhill Series 50 single-deck rotary switch, part number 50MT36-01-2-02S printed on the body label
- Positions: 2, poles: 2, per the part number and the catalog data carried with it - verify against the datasheet before use
- Contact timing: shorting, make-before-break, so adjacent positions are briefly bridged during rotation
- Angle of throw: 36 degrees; the printed label ring is numbered 1 through 10, the ten-index full circle the frame is built around
- Termination: gold-plated solder lugs in a black insulator - panel-mount hardware, not a PCB footprint
- Shaft: 1/8 inch (0.125 in) diameter with a machined flat - knobs bored for 1/4 inch shafts will not fit
- Orange seal ring seated at the bushing shoulder, visible in the photographs
- Body diameter approximately 13 mm against the millimeter scale, consistent with the 1/2 inch Series 50 frame
- Current rating 200 mA at 28 VDC and 150 mA at 115 VAC per published catalog data - not confirmed here, verify against the datasheet before use
- Mounting: threaded bushing for panel mounting; drill size and thread pitch not confirmed here, check the bushing against the datasheet before you cut a panel
Applications
- A bench technician restoring a crowded instrument front panel, where a half-inch can is the only selector that will clear the hardware behind the face
- Radio and panel work where a two-position mode selector has to sit in a face that wants a seal ring at the bushing
- Low-level signal selection in a test fixture, at the milliamp-scale currents this frame was built around, where make-before-break avoids opening the path mid-rotation
- An audio builder wiring a two-position input or gain selector who already has a knob bored for a 1/8 inch flatted shaft
Frequently Asked Questions
Is this a shorting or a non-shorting switch?
Shorting, also called make-before-break. During rotation the wiper touches the next position before it leaves the one it is on, which briefly bridges the two. If your circuit cannot tolerate that bridge - two separate supplies tied together for an instant, for example - this is the wrong switch. Confirm your contact timing requirement before ordering.
Will my knobs fit this shaft?
Only if they are bored for a 1/8 inch (0.125 in) shaft with a flat. The flat is clearly visible in the close-up photograph. Most common knobs, including many Grayhill knobs, are sized for 1/4 inch shafts and will spin loose on this one. Check the bore of the knob you plan to use before ordering.
What does the MT in the part number mean, and what do the photos actually show?
The photographs show an orange seal ring seated at the shoulder where the bushing meets the body, which is the physical detail buyers look for on this variant. The MT designation is generally read as process-sealed construction, but we cannot confirm the sealing specification from a photograph. Verify it against the Grayhill Series 50 datasheet before use if your installation depends on the seal.
Does it come with a mounting nut, washer or knob?
Not confirmed. One photograph shows a hex nut run down the bushing against the seal ring and another shows the bushing threads bare, and stock here is more than one piece. Plan on sourcing your own mounting hardware and knob, and treat anything extra as a bonus rather than part of the sale.
It is listed as unused NOS but untested. What am I actually taking on?
You are taking on the electrical test. The switch is unused new old stock, evaluated by eye only: no continuity check, no rotation count, no measurement of the shorting overlap. What is confirmed is what the camera shows - the markings on the label, clean unsoldered gold lugs, an unmarked flatted shaft, and the seal ring in place - and those photographs are the spec for the piece that was photographed. Stock is more than one, so the switch you receive is a like piece rather than the exact one on the ruler, and it is sold each. Shipping is a flat $8.00, free once your order passes $28.00, and orders leave our Idaho warehouse the same or next business day.
A half-inch can with a ring numbered 1 through 10, stopped at two - a whole index boiled down to one decision on a crowded panel. Gold lugs, a flat on the shaft, and whichever two states your circuit has to pick between are yours to wire.
