Miniature Momentary Pushbutton

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Part# 11-01899
MFR Model# 8631ZBD2


Switch, Black, Micromini, Pushbutton, SPST, Off-Mom, PC Terminal, Normally open
California Prop 65 Warning Symbol

WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.



Smal enough to fit most applications

Point T Verified Purchase


August 23, 2022

the product worked great perfect replacement

Danny B Verified Purchase


March 1, 2022

Perfect for our application of a press to test button for some of our annunciator lights. Small so it wont take up much panel space, light pressure to activate.

Gary H Verified Purchase


February 18, 2022

Richard M Verified Purchase


December 16, 2021

Returning to small of a item the 1/4 inch switch you carry is discontinued I will order another to try

Bill D Verified Purchase


June 23, 2021

Works perfectly. Nice easy switch doesn’t take much pressure.

Sean D
March 22, 2021

Seems to work well. Handled the heat of soldering just fine. Would prefer a star or lock washer under the nut to address vibration induced failure.

Tom S
September 13, 2019

used for a bonanza V35. Worked well.

Jeffrey G Verified Purchase


September 8, 2022

A good switch, but keep in mind it is really subminiture small.

Mark U
December 6, 2018

The switch is probably ok, but I cannot use it because of its small size. The descriptions on you web site were not helpful in selecting a proper replacement switch. I ended up ordering another switch from another supplier.

John S
June 6, 2020


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What are the dimensions of the PTT 11-01899?

For part number 11-01899 the body of the switch is 1/4" wide, the height of the PTT with button is 5/8" and 1/2" without button and the hole size for the PTT is 5/32".

Q: Do these miniature momentary push button switches come with a nut?

Yes, the nut is included.

Q: This switch does come with a nut.

Thank you for updating us, we have fixed our Q+A

Q: Can this be used in a 24 volt system?

Yes this switch button can be used on 12 volt and 24 volt systems.

Q: Is this switch, part # 11-01899, normally open?


Q: What is the length of the threaded portion of this switch?

Please see the Drawing tab for measurements of the switch.

Q: Does the switch have a detent that can be felt?

No, it does not.

Q: What size are the nut and washer for this? (I understand it’s included, but I need a replacement for mine which is missing the nut and washer and recessing into the hole.)

The data sheet calls for a 8-40 nut.

Q: The description indicates PC terminal and it looks as it is designed for a mating terminal? What kind of connector would you use on this switch and does Aircraft Spruce carry them?

This would require soldering the wire. There is no connector made for this.

Q: Are these required to be TSO certified, or can they only be used in experimental aircraft?

These switches are not certified on their own. They are commonly used in aircraft and may be approved as replacements under the airframe approval. It is always wise to consult with an A&P before installing any part on a certified aircraft.

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