Cherry MX variants
This page documents the standard variants of Cherry MX as well as some of the known custom variants. MX Low Profile and MX Ultra Low Profile are nothing to do with MX and are documented separately.
Contents
- Sources
-
Standard types
- MX1A-0NNN
- MX Black
- MX Linear Grey
- MX Lock
- MX White
- MX Click Grey
- MX Clear
- MX Tactile Grey
- MX Blue
- MX Green
- MX Brown
- MX Red
- MX RGB Black
- MX RGB Blue
- MX RGB Brown
- MX RGB Red
- MX Silent Red
- MX Silent RGB Red
- MX Silent Black
- MX Silent RGB Black
- MX RGB Nature White
- MX Speed Silver
- MX Speed RGB Silver
- MX Ergo Clear
- MX Ergo Clear RGB
- MX Black Clear-Top
- Custom types
Sources
- Cherry MX part number schema, 1982–3 (TS 00006)
- Cherry Tastenmodul MX (July 1985)
- Cherry keyboards, keyswitches and displays advertisement, Electronic Engineers Master Catalogue 1985–86 Volume B
- Cherry MX part number schema, 1988 (TS 00006-2)
- Cherry Product Change Notification 2019-09-24 (MX)
- Cherry Product Change Notification 2019-10-11 (MX)
- Hirose datasheet on MX (this cannot be shown here; September 1990)
- Cherry’s MX innovation timeline
- Datasheets from Cherry websites
- Discussions with Cherry
Cherry drawing TS 00006, the original MX part number schema, first drawn in November 1982, lists MX1A-11xx (Black), MX1A-21xx (Linear Grey), MX1A-31xx (Lock), MX1A-A1xx (White) and MX1A-B1xx (Click Grey). The drawing was last modified in September 1983, which suggests but does not prove that these models were all available by that point. (Not all of those types were necessarily included when the drawing was originally created, either.)
The 1988 schema (drawing TS 00006-2) adds MX1A-C1xx (Clear), MX1A-D1xx (Tactile Grey), MX1A-E1xx (Blue) and MX1A-F1xx (Green).
Standard types
Although Cherry does now refer to switches by their colours, this is a recent change: Cherry adopted the enthusiast community’s names for their switches. These names are used below simply for clarity, because it is too much to expect most people to remember the different models by part numbers alone. Some of these names appear to have been defined by Cherry themselves when introducing new switch types for the gamer market.
MX1A-0NNN
According to Hirose, “German MX switch was based on Japan version”. MX1A-0NNN is the part number given in Hirose’s datasheet, with 50 cN actuation. No Hirose patent has been found for linear MX.
The Yamaha QX3 Digital Sequence Recorder service manual gives the keyboard switches in the machine as MX1A-0NNN. Correspondence between UncleFan and online sellers indicates that these switches are both orange and clear, and within the same QX3 unit there can be a random assortment of both colours. Examples depicted online show them as orange. Surplus parts obtained from Yamaha in 2019 (the last three available) had clear stems.
Part | MX1A-0NNN |
---|---|
Introduced | 1983? |
Stem | Orange, clear |
Shell | Black |
Type | Linear |
Actuation force | 50±17 gf |
Preload | ? |
Terminal force | ? |
The example below is one of the last three NOS MX1A-0NNN stocked in the European parts centre for Yamaha. It has the “A” movable contact type. As expected, it is slightly lighter than MX Black.
MX Black
Cherry’s own diagram shows MX Black as being introduced in 1984 (following MX Linear in 1983), but it was given in the 1982–3 part number schema as “schwarz” (black).
Part | MX1A-11xx |
---|---|
Introduced | 1983? |
Stem | Black |
Shell | Black |
Type | Linear |
Actuation force | 60±20 cN |
Preload | 30 cN min. (2016) |
Terminal force | ca. 85 cN |
The last-order date for MX1A-11DW was 31st October 2019.
MX Linear Grey
In the 1982–3 part number schema, this type is given simply as “grau” (grey). In older keyboards, it was found as a pale grey with a subtle cream tint. In the 1988 part number schema the grey colour was formalised as “grey 37”. The plunger is currently a medium grey.
In US-made keyboards made around 1984, space bar used a black switch marked with a red spot of paint on the bottom for differentiation. It seems that Cherry US did not use standard German space bar switches.
The lack of illustrated examples from either factory makes it hard to be clear on what colours were used and when.
Part | MX1A-21xx |
---|---|
Introduced | 1983? |
Last order date | 31st October 2019 |
Stem | Pale cream-grey, “grey 37” |
Shell | Black |
Type | Linear, for space bar |
Actuation force | 80±25 cN |
Preload | 30 cN min. (2015), depicted as ca. 50 cN |
Terminal force | ca. 110 cN |
Parts MX1A-21DN and MX1A-21DW were discontinued as of 24th September 2019.
MX Linear Grey datasheet (2015)
MX Lock
MX Lock was found in a Xerox 1109 type 2 keyboard dated 1984. It was omitted from the German 1985 datasheet, but it was included in the 1982–3 part number schema. Although the aforementioned Xerox keyboard was made in Japan, the MX Lock switch was the one switch type with an 8 mm keystem intead of a Hirose keystem. MX Lock uses the same rotating-wheel latching mechanism as Cherry gold crosspoint, offering smooth operation without the detent feel associated with heart cam designs. This switch does appear in the 1985 EEM advertisement.
The following distinct types have been observed:
- Black shell and plunger (Hirose-made keyboard for Xerox, 1984)
- Black base, grey top and black plunger (the type sold in the keyboard community, but only observed in a single keyboard from 1985, the photos of which are no longer online)
- Black shell and clear plunger (the colour arrangement in use when the switch was discontinued in 2015)
The all-black type may well be US-made, as it seems US-made MX switches were not colour-coded at their introduction. As Hirose was already importing M6 into Japan, they may have also imported the US-made alternate action switches, possibly out of a lack of need to create tooling for these domestically.
The grey colour scheme used in Germany was discontinued when supply of the pigment ended, and the colour arrangement was changed to black with a clear plunger.
Part | MX1A-31xx |
---|---|
Introduced | 1983? |
Stem | Black, colourless |
Shell | Black+grey, black |
Type | Alternate action (linear) |
Actuation force | 60±20 cN |
Preload | 30 cN min. (2015), depicted as 35 cN |
Terminal force | ca. 105 cN |
MX White
“MX White” refers to the original tactile version of Cherry MX, which offered “movement differential” (hysteresis) as well as a subtle click sound. Originally unpigmented, in more recent times it gained white pigmentation.
The precise details of the origin of MX White are no longer clearly remembered. Günter Murmann’s accounts vary, owing to how many decades have passed since MX was introduced. The design was instigated at the behest of German typewriter manufacturer Olympia, who wished to transition from a more expensive Marquardt switch (likely the “Butterfly” type) to Cherry MX while retaining one or more of the characteristics of the outgoing switch type. This process appears to have taken place during the design of MX, as the end result was incorporated into the MX patent, US patent 4467160, “Low profile switch” (filed on 1983-07-12 with a priority date of 1982-08-06 and granted on 1984-08-21). Olympia declined to purchase the finished product, leaving Cherry to market the design as a general purpose switch.
In one account, Herr Murmann indicated that Olympia wished to retain the click feedback of the Marquardt type; the resulting design brought with it hysteresis, which Cherry found to be of more value to prospective customers. With the click feedback considered undesirable, it was then suppressed with lubrication.
In a more recent account, hysteresis is stated to have been the characteristic that Olympia sought to retain. This seems more likely on the basis that simpler click mechanisms exist, and that the MX design is very specific about ensuring that hysteresis occurs (although it does appear that the switch contacts can be teased if held at the release point). Herr Murmann explained that Olympia’s electronics expected the switch to have hysteresis, a limitation that would disappear in time as keyboard encoders became more advanced. Another significant advantage of snap-acting contacts or a mechanism of equivalent functionality is much greater control over the actuation point. Alps for example issued a patent for a revision to their SKCL/SKCM contact system specifically to tighten the tolerance on pretravel distance.
In either case, Cherry never considered the click feedback to be a marketable feature. Click feedback is never mentioned in the patent, and their sales material for MX switches and MX-based keyboards makes no mention of it either. An example of how MX White was marketed can be found in the G80-0928H brochure, which notes:
Einsatz der überlegenen MX Taste mit 4 mm Betätigungs-Hub und Gold-Crosspoint-Kontakten, in Linear- oder Druckpunkt-Version mit taktiler Rückmeldung ("Fühlbarer Click")
Further down, it also states:
Optionen:
…
Lineare Tastenmodulausführung mit akustischer Rückmeldung ("Hörbarer Click")
This brochure appears to be dated November 1986. At this point, the primary options were linear or tactile, although MX White is curiously described as “tactile click”. Additionally, you could select linear with “acoustic” feedback (“audible click”).
In the 1982–1983 version of the MX part number schema, MX1A-A1xx is listed as “natur”, meaning that it was originally unpigmented. This is not unexpected, as Cherry Germany tended to use black and clear as the two main colour options in switches; the use of additional pigments came at an increased cost over unpigmented plastic and the widely-used black-pigmented platstic. The white pigmentation was added by 1988, as in the 1988 part number schema it is given as white.
A few years later, there was cause to produce a version that did provide audible feedback, which was MX Blue.
Part | MX1A-A1xx |
---|---|
Introduced | 1983? |
Last order date | 31st October 2019 |
Stem | Clear, white |
Shell | Black |
Type | Tactile with hysteresis |
Actuation force | 75±25 cN (1985), 70±20 cN (2016) |
Preload | 30 cN min. (2015), depicted as ca. 45 cN |
Terminal force | ca. 85 cN |
MX Click Grey
“MX Click Grey” is something of a misnomer, because although MX White and MX Click Grey can click, this is seemingly not intentional. This should really be “MX Movement Differential Grey” but that is something of a fingerful.
In the 1982–3 schema, these are “dunkelgrau” (dark grey); in the 1988 schema they are given specifically as “grey 36”.
Part | MX1A-B1xx |
---|---|
Introduced | 1983? |
Stem | Grey (“grey 36” as of 1988) |
Shell | Black |
Type | Tactile with hysteresis, for space bar |
Actuation force | 95 cN |
MX Clear
The introduction of MX Clear has never been discovered. German patent DE3713775, “Tastenschalter” (filed on 1987-04-24 with a priority date of 1987-04-24, disclosed on 1988-11-10 and granted on 1996-02-08), depicts a tactile version of Cherry MX with a fixed slider arrangement. This would tentatively suggest that MX Clear was introduced around 1987–1988, and it was listed in the 1988 part number schema.
It may forever remain a mystery why Cherry chose to apply pigment to the slider of the existing MX1A-A1xx type. It is possible that both MX1A-A1xx and MX1A-C1xx were unpigmented simultaneously, with the “cam” on the slider being the sole means of identification. That is, black may have denoted linear, and colourless, tactile. The use of white pigment for MX1A-A1xx may have been applied at a later date when the cam was not felt to be a sufficient clue, although even then, one would imagine that a pigment more obvious than white would have been chosen. The purpose of the cam itself remains a mystery.
Part | MX1A-C1xx |
---|---|
Introduced | ca. 1987 |
Stem | Clear |
Shell | Black |
Type | Tactile |
Actuation force | 55±20 cN |
Preload | 40 cN (2015) |
Terminal force | ca. 95 cN |
The last-order date for MX1A-C1DN was 31st October 2019.
MX Tactile Grey
This is the space bar counterpart to MX Clear. There was no 2015–6 datasheet available for it.
Part | MX1A-D1xx |
---|---|
Introduced | ca. 1987 |
Last order date | 31st October 2019 |
Stem | “Grey 39” (ca. 1988 onwards) |
Shell | Black |
Type | Tactile, for space bar |
Unitron in Taiwan made an IBM layout keyboard for their U-2200 computer, Unitron model U-2235, that appears to be all MX Tactile Grey switches. The owner of the keyboard describes this keyboard as “quite nice to type on with reasonable travel and a soft tactile feedback”.
MX Blue
Cherry give MX Blue as being introduced in 1987. No further details are known about its introduction. This model, too, appears to have been introduced without slider pigment, in the form of “Type B” vintage MX White. This would suggest that the additional pigmentation was applied in 1988.
The existence of “pale blue” and “dark blue” switches remains unexplained.
Part | MX1A-E1xx |
---|---|
Introduced | ca. 1987 |
Stem | Blue |
Shell | Black |
Type | Click with hysteresis |
Actuation force | 50±15 cN |
Preload | 25 cN min. (2015), depicted as ca. 37 cN |
Terminal force | ca. 60 cN |
The last-order date for MX1A-E1DW was 31st October 2019.
MX Green
This is the space bar counterpart to MX Blue. Strangely, it was not assigned a grey shade.
Part | MX1A-F1xx |
---|---|
Introduced | ca. 1987? |
Stem | Green |
Shell | Black |
Type | Click with hysteresis, for space bar |
Actuation force | 70±20 cN |
Preload | 25 cN min. (2015), depicted as ca. 45 cN |
Terminal force | ca. 90 cN |
The last-order date for MX1A-F1DW and MX1A-F1NW were 31st October 2019.
MX Brown
This was a custom part introduced in 1992 for Kinesis, and made available from 1994 (according to the Deskthority wiki, unreferenced). Cherry generally do not use this in standard products.
Part | MX1A-G1xx |
---|---|
Introduced | 1992 |
Stem | Brown |
Shell | Black |
Type | Tactile |
Actuation force | 45±20 cN |
Preload | 30 cN min. (2015), depicted as 40 cN |
Terminal force | ca. 60 cN |
MX Red
This was a custom part introduced in late 2008, as a limited run (according to the Deskthority wiki). However, a few years later it had been reintroduced as a permanent entry in the range. As a linear switch, this should have followed on from MX Lock as MX1A-41xx, but it was bizarrely placed some distance into the tactile range as MX1A-L1xx.
Part | MX1A-L1xx |
---|---|
Introduced | 2008 |
Stem | Red |
Shell | Black |
Type | Linear |
Actuation force | 45±15 cN |
Preload | 30 cN min. (2015) |
Terminal force | ca. 58 cN |
MX RGB Black
The part numbers are the same as MX Black, except that N and W in the final position are replaced with A and B.
Part | MX1A-11Nx |
---|---|
Introduced | 2014 |
Stem | Black |
Shell | Translucent base, clear top with lens |
Type | Linear |
Actuation force | 60±20 cN |
Preload | 30 cN min. (2015), depicted as 35 cN |
Terminal force | ca. 85 cN |
MX RGB Blue
The part numbers are the same as MX Blue, except that N and W in the final position are replaced with A and B.
Part | MX1A-E1Nx |
---|---|
Introduced | 2014 |
Stem | Blue |
Shell | Translucent base, clear top with lens |
Type | Click with hysteresis |
Actuation force | 50±15 cN |
Preload | 25 cN min. (2015), depicted as ca. 37 cN |
Terminal force | ca. 60 cN |
MX RGB Brown
The part numbers are the same as MX Brown, except that N and W in the final position are replaced with A and B.
Part | MX1A-G1Nx |
---|---|
Introduced | 2014 |
Stem | Brown |
Shell | Translucent base, clear top with lens |
Type | Tactile |
Actuation force | 45±20 cN |
Preload | 30 cN min. (2015), depicted as 40 cN |
Terminal force | ca. 60 cN |
MX RGB Red
The part numbers are the same as MX Red, except that N and W in the final position are replaced with A and B.
Part | MX1A-L1Nx |
---|---|
Introduced | 2014 |
Stem | Red |
Shell | Translucent base, clear top with lens |
Type | Linear |
Actuation force | 45±15 cN |
Preload | 30 cN min. (2015) |
Terminal force | ca. 58 cN |
MX Silent Red
MX Silent Red introduced a damping mechanism to the switch, that softens both the upstroke and downstroke impacts of the plunger. The term “silent” is a widespread misnomer, as silent physical keyboards are fundamentally impossible. Further, “silent” was also applied by Metadot to their MX Brown keyboards, which are loud compared to standard rubber dome keyboards, and extremely loud compared to notebook keyboards.
“Silent” switches adopted the prefix “MX3A”.
The last-order dates for models MX3A-L1DN and MX3A-L1JW was 31st October 2019.
Part | MX3A-L1xx |
---|---|
Introduced | 2015 |
Stem | Pink (soft red) |
Shell | Black |
Type | Damped linear |
Pretravel | 1.9±0.6 mm |
Total travel | 3.7−0.4 mm |
Actuation force | 45±15 cN |
Preload | 30 cN min. (2015) |
Terminal force | ca. 60 cN |
MX Silent Red datasheet (2015)
MX Silent RGB Red
Part | MX3A-L1Nx |
---|---|
Introduced | 2015 |
Stem | Pink (soft red) |
Shell | Translucent base, clear top with lens |
Type | Damped linear |
Pretravel | 1.9±0.6 mm |
Total travel | 3.7−0.4 mm |
Actuation force | 45±15 cN |
Preload | 30 cN min. (2015) |
Terminal force | ca. 60 cN |
MX Silent RGB Red datasheet (2015)
MX Silent Black
Part | MX3A-11xx |
---|---|
Introduced | 2016 |
Stem | Dark grey (soft black) |
Shell | Black |
Type | Damped linear |
Pretravel | 1.9±0.6 mm |
Total travel | 3.7−0.4 mm |
Actuation force | 60±20 cN |
Preload | 30 cN min. (2015) |
Terminal force | ca. 85 cN |
MX Silent Black datasheet (2015)
MX Silent RGB Black
Part | MX3A-11Nx |
---|---|
Introduced | 2016 |
Stem | Dark grey (soft black) |
Shell | Translucent base, clear top with lens |
Type | Damped linear |
Pretravel | 1.9±0.6 mm |
Total travel | 3.7−0.4 mm |
Actuation force | 60±20 cN |
Preload | 30 cN min. (2015) |
Terminal force | ca. 85 cN |
MX Silent RGB Black datasheet (2015)
MX RGB Nature White
MX RGB Nature White was a short-lived model that aimed to bridge the gap between MX Red—held by some to be too light and too easy to accidentally press—and MX Black, which many people find too stiff to type on for long periods. In practice, it ended up virtually indistinguisable from MX Black. Unusually it was offered as a single part—MX1A-41NA—with no options for diodes, jumpers or fixing pins.
Part | MX1A-41NA |
---|---|
Introduced | 2016 |
Last order date | 24th September 2019 |
Stem | Colourless |
Shell | Translucent base, clear top with lens |
Type | Linear |
Actuation force | 52±15 cN |
Preload | 30 cN min. (2015), depicted as 38 cN |
Terminal force | ca. 65 cN |
MX RGB Nature White datasheet (2015)
MX Speed Silver
MX Speed Silver was introduced for gamers. The pretravel distance is reduced, making the switch “faster” as it does not need to be pressed as far (and thus not pressed for as much time) before it actuates. The total travel distance is also reduced. Operating force is 45±15 cN as per MX Red, but the force gradient is steeper.
Part | MX1A-51Nx |
---|---|
Introduced | 2016 |
Stem | Metallic grey |
Shell | Black |
Type | Linear |
Pretravel | 1.2±0.4 mm |
Total travel | 3.4−0.4 mm |
Actuation force | 45±15 cN |
Preload | 30 cN min. (2016) |
Terminal force | ca. 70 cN |
MX Speed Silver datasheet (2016)
MX Speed RGB Silver
The part numbers are the same as MX Speed Silver, except that N and W in the final position are replaced with A and B.
Part | MX1A-51Nx |
---|---|
Introduced | 2016 |
Stem | Metallic grey |
Shell | Translucent base, clear top with lens |
Type | Linear |
Pretravel | 1.2±0.4 mm |
Total travel | 3.4−0.4 mm |
Actuation force | 45±15 cN |
Preload | 30 cN min. (2016) |
Terminal force | ca. 70 cN |
MX Speed RGB Silver datasheet (2016)
MX Ergo Clear
“Ergo Clear” is an idea that dates back a number of years. “Ergo Clear” refers to the idea of reducing the force of MX Clear, a switch that many people feel is somewhat too stiff. This idea was put to Cherry but did not enter production, thought in part to be because the lighter return spring could not reliably push the plunger back through the tactile bump. Various community and Far East commercial efforts resulted instead, in particular the famous Zealio switches manufactured for ZealPC by Gateron. In 2022, Cherry announced an official Ergo Clear switch using the original community moniker.
Part | MX1A-H1Nx |
---|---|
Announced | October 2022 |
Introduced | 2022 |
Stem | Clear |
Shell | Black |
Type | Tactile |
Pretravel | 2 mm |
Total travel | 4 mm |
Tactile force | 55 cN |
Actuation force | 40 cN |
Preload | 35 cN |
Terminal force | ca. 60–75 cN (unspecified) |
MX Ergo Clear and Ergo Clear RGB datasheet (2022)
MX Ergo Clear RGB
The part numbers are the same as MX Ergo Clear, except that N and W in the final position are replaced with A and B.
Part | MX1A-H1Nx |
---|---|
Announced | October 2022 |
Introduced | 2022 |
Stem | Clear |
Shell | Black |
Type | Tactile |
Pretravel | 2 mm |
Total travel | 4 mm |
Tactile force | 55 cN |
Actuation force | 40 cN |
Preload | 35 cN |
Terminal force | ca. 60–75 cN (unspecified) |
MX Ergo Clear and Ergo Clear RGB datasheet (2022)
MX Black Clear-Top
MX Black Clear-Top is a semi-faithful recreation of the popular “Nixie” switch historically custom-manufactured by Cherry for Nixdorf. Actuation force has been increased from 60 to 63.5 cN and optional contact lubrication is available in a formulation chose to correspond with Krytox GPL 205 Grade 0. The upper shell seems to be less translucent than the original Nixie (although this remains to be confirmed) and the replacement switches do not come with a diode fitted. There is no sign of the corresponding space bar type either.
Part |
MX2A-61NW (factory lubricated) MX1A-61NW (unlubricated) |
---|---|
Announced | November 2022 |
Introduced | 2023 |
Stem | Black |
Shell | Black base, colourless translucent top |
Type | Linear |
Pretravel | 2 mm |
Total travel | 4 mm |
Actuation force | 63.5 cN |
Preload | 40 cN minimum |
Terminal force | ca. 80 cN (unspecified) |
MX Black Clear-Top datasheet (2022)
Custom types
Custom types have a letter instead of a number in position 6 of the part number (see MX part number schema). Although “N” for Hirose types is a customisation, these are classified as standard switches, above. “G” types denoting German-made customisations are covered below, along with types with no known part number.
Quoted descriptions are per Cherry.
Part | Type | Source | Last order date |
---|---|---|---|
MX1A-1GAP | No details recorded | Cherry internal database | |
MX1A-1GBR | MX Black, PCB mount, “179 CN PCB MOUNT N/O” | Cherry US | |
MX1A-1GCL | MX Black, PCB mount, marked “lowest force possible” (bag dated 8-26-94) | Cherry US | |
MX1A-1GCX | “350CN W/PINS” | Cherry internal database | |
MX1A-1GER | “like MX1A-11NW; but with special packaging” | Surplus sites; Cherry | |
MX1A-1GFD | “like MX1A-11RW; but customer-specific sticker” | Surplus sites; Cherry | |
MX1A-1GFK | “like MX1A-11NN-2; but with profile contact” | Cherry | |
MX1A-1GRE | Unknown; has red LED | Surplus sites | |
MX1A-EGEQ | MX Blue, PCB mount, 180 cN | Cherry US | 31st October 2019 |
MX1A-FGFB | “like MX1A-F1NW; but with other spring”; also said by Cherry to be “Linear” and “RGB with Pins” | Surplus sites; Cherry |
The term “MX Super Black” refers to one or more models of MX Black with a heavier spring. Discovery of the variety of custom types indicates that there are multiple weightings applied to MX Black switches, and the various “super black” types are likely to be custom types.
Nixie
In Cherry’s press release for Cherry MX Black Clear-Top—their modern recreation of the “Nixie” switch, they define the “Nixie” as follows:
The community name “Nixie” originates from a variant of the classic MX Black, which was specially adapted to the wishes of the former German company Nixdorf Computer AG: The requirement was a milky upper part of the housing, an increase in the actuating force from 60 to 63.5 centinewtons, as well as the relatively rare solution at the time of having a diode integrated into the switch for n-key rollover, or NKRO for short.
Cherry have not stated what actual material has been uncovered and how much is simply guesswork, as on Instagram in particular they have made some categorically false statements about their own product history.
MX1A-1GCX
This is a heavy version of MX Black. According to Cherry, as of May 2018, these were last in production in January 2016, with an order for 240,000 pieces. They had been available for sale at Arrow, who denied all knowledge of them, although the entry remains on their site as an “Unclassified” “Desktop profile keyswitch”. SwitchMod purchased these from Arrow and resold them as “Mega Black”, and there is a force curve for one of these.
The purpose of these switches remains unknown.
Part | MX1A-1GCX |
---|---|
Stem | Black |
Shell | Black |
Type | Linear |
Actuation force | 350 cN |
Preload | ca. 200 cN (per the force curve) |
Terminal force | ca. 510 cN (per the force curve) |
Olympia linear clear
“Olympia linear clear” is a custom type found in some AEG Olympia typewriters. The stem shape and keycap mount differ, and the PCB–plate distance is 1 mm greater while the shell overall remains the same height. Due to the dearth of typewriter repair manuals (unlike IT equipment service manuals, typewriter service manuals are not generally available) it may prove impossible to find the part number for this type.
“Olympia linear clear” appears to be designed to allow Cherry MX to substitute for Marquardt Series 6180 in their typewriters, which has the same above- and below-plate dimensions.
Part | ? |
---|---|
Stem | Clear |
Shell | Black |
Type | Linear |
Actuation force | 60 cN? |
Preload | ? |
Terminal force | ? |