Product Overview
C&K 8551 Subminiature SPST Normally Open Momentary Panel Mount Switch
Condition
Unused new old stock (NOS). Stamped markings include C&K, 8551, 3 A 120 VAC, USA, and UL component recognition symbol. Clean solder terminals with threaded bushing, two mounting hex nuts, and internal-tooth lockwasher attached.
Same or next business day shipping from our Idaho warehouse. Reliable parts since 1999. Honest pricing, no nonsense.
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Product Overview
The C&K 8551 (catalog number 8551MZQE2) is a subminiature SPST normally open momentary pushbutton switch rated for 3 A at 120 VAC or 28 VDC. Manufactured in the USA with silver contacts and epoxy-sealed solder terminals, it installs cleanly into panels and instrumentation requiring reliable tactile actuation.
Key Features
- Contact configuration: SPST-NO, Off-(Mom) momentary action
- Electrical rating: 3 A at 120 VAC or 28 VDC
- Terminal type: Epoxy-sealed rear solder lugs
- Actuator: Black round plunger button
- Mounting: Threaded subminiature bushing with dual hex nuts and star lockwasher
Applications
- Replacing worn controls in vintage test gear, communication gear, and industrial panels matching the classic C&K 8500-series footprint.
- Wiring custom synthesizers, benchtop test boxes, and pedalboard triggers that demand positive tactile switching.
Frequently Asked Questions
What is the switching action of the 8551?
It is an Off-Momentary single-pole single-throw switch. The circuit remains open until the plunger is pressed, closing the contact for as long as pressure is maintained, and returning to open upon release.
What mounting hardware is included with each switch?
Each switch includes two threaded hex nuts and one star lockwasher installed on the threaded bushing.
Why buy individual switches here instead of a surplus bulk lot?
You get the exact quantity needed for your build without purchasing an unverified assortment or surplus lot. Each switch is clean and ready to install. If you need multiples, more pieces cost less each, and the price-break table on this page shows what each quantity costs. Orders ship for an $8 flat rate, qualify for free shipping at $28, and leave our Idaho warehouse the same or next business day.
Nothing quite matches the crisp snap of an old-school C&K pushbutton. Put it on the panel, wire the lugs, and let the project run.
