Test tube containing a hand-selected collection of 7 loose switches Cherry MX Silent Red 45g Linear Plate Mount RGB Cherry MX Red 45g Linear PCB Mount Cherry MX2A Blue 60g Clicky Plate Mount RGB Kailh BOX White 45g Clicky Plate Mount MK Holy Llama 55g Tactile PCB Mount Cherry MX Brown Hyperglide 45g Tactile PCB Mount Gateron Clear 35g Linear Plate Mount Formulated especially for those new to mechanical keyboards, this introductory switch tester tube has switches with varying feels, weights, and actuations. All the must-try switches in one place.
研究ノート
1. What this is
SWITCH TESTER TUBE INTRO FORMULA 821 ("MK Switch Tester Tube Intro Formula 821") is catalogued as a push-button / switch device from MK.
2. What we know
- Manufacturer: MK
- Category: push-button / switch device
- Part number / name: SWITCH TESTER TUBE INTRO FORMULA 821 — MK Switch Tester Tube Intro Formula 821
- MK — see the manufacturer's catalog for this part.
3. How to identify / order the exact part
The full specifications for this part are not machine-decodable from the data we hold. To confirm the exact configuration (contacts, rating, colour, mounting, protocol), search the MK catalog for this part number on the manufacturer site or a distributor (DigiKey / Mouser / RS).
4. Data-quality note
This page is generated from the catalogued manufacturer, category, and product name. Per our keep-and-document policy we publish a page for every part we hold and state plainly what is known versus what needs verification, rather than deleting the row or inventing specs. Flagged decoded-partial.
5. Sources
- MK product catalog — search "SWITCH TESTER TUBE INTRO FORMULA 821" / "MK Switch Tester Tube Intro Formula 821"
出典
- MK SWITCH TESTER TUBE INTRO FORMULA 821 — distributor/catalog
仕様一覧
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Device class
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push-button
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Enriched by
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generic-fallback-2026-08-12
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Pn status
|
decoded-partial
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Product type
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Switch Testers
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Shopify id
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8874667933996
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Vendor
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MK
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取付クイックリファレンス
Panel cutout: 22mm. Insert from the front of the panel, secure with mounting nut from behind (tighten to 2-3 Nm).
Contact block: Snap or screw the contact block onto the rear of the button body. Ensure the contact block orientation matches the wiring diagram — NO terminals are usually marked.
Wiring: Use 0.5-2.5mm² stranded wire with ferrules. Tighten screw terminals to 0.8 Nm. Test the button function before energizing the circuit.
外形寸法
トラブルシューティング
Button doesn't respond when pressed
Check the contact block first — it's the most common failure point. Test continuity across the NO or NC terminals with a multimeter. If no click is felt, the return spring in the head may be broken.
Works intermittently
Contact block contacts are pitted or burned. Replace the contact block — don't try to file the contacts. Check if the rated cycle count has been exceeded.
Button feels mushy or doesn't click
The spring return mechanism in the button head is worn. Replace the head. The contact block can usually be reused if it tests OK.
主要仕様
- Device class
- push-button
- Enriched by
- generic-fallback-2026-08-12
- Pn status
- decoded-partial
- Product type
- Switch Testers
- Shopify id
- 8874667933996
