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From $14.85 to $15.95
MIL No. Otto No. Description Part Number Price Buy
MS25089-1CR P1-32121 Threaded Bezel, Red 11-00748 $15.95
MS25089-1C P1-32122 Threaded Bezel, Black 11-00749 $15.50
MS25089-1CW P1-32129 Threaded Bezel, White 11-00750 $15.95
MS25089-1AL P1-12121 Press Fit, Red 11-00745 $15.95
MS25089-1A P1-12122 Press Fit, Black 11-00746 $15.95
MS25089-1AW P1-12129 Press Fit, White 11-00747 $14.85
Subtotal $0.00
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The P1 is a sealed, dustproof, snap action, military grade switch ideal for switching low level up to 10 amps. It features screw terminals, and includes screws, lockwashers, and solder lugs. MIL qualified. Dustproof, snap action, screw terminals, rugged reliable construction.

Electrical: (at 28VDC or 115VAC, 60/400 Hz.)
Load Amperes Life (Nominal)
Resistive 10 25,000 cycles
Inductive/Motor 5 25,000 cycles
Lamp 3 25,000 cycles


  • Button sealed with patented “rolling sleeve” principle
  • Contact area sealed at button & terminals
  • Less than 25mΩ contact resistance
  • Ideal for low level switching as well as up to 10 amp duty
  • Positive tactile feedback
  • Customers Also Viewed
  • Frequently Purchased With


Works well, as expected/described. One note: These are screw-on terminals (although you could solder instead if you prefer), but if you are installing this into a straight diameter hole, the screw heads will hit the outside of the handgrip material - I had to bend the tabs into slightly to avoid this issue. Really, the terminals should have been placed another 1/16 of an inch more inside. But a little bending fixes the problem and the switch works fine. To activate the switch, I did not find the 4lbs force (versus 2 lbs force for other models) to be a problem (i.e. the force to activate is not too high).

Steve H
December 9, 2019

Bought for my Rans s9 Chaos and seems to work as advertised.

Mark C
November 14, 2019

Sorry I cant rate this switch. It is the one I thought I ordered but when I got it in the mail I found it doesnt have threads and lock nut. Not sure how to mount it. Wish I got the one shown in the picture😕

Randy S
November 10, 2019

Doesn’t feet for Grumman Aa5a

Nidal A
September 22, 2019

Perfect PTT switch for my application. Just the right pressure to activate & a positive feel engagement.

September 14, 2019

I decided to try these in my PA-38 because I use it for training and my students wear out other PTT switches quickly. They fit nicely and so far are working very well. They feel very solid and durable. The 4lb. pressure works out great since students tend to push hard on the switches.

Fly-rwi L
February 12, 2019

Bought the switch when chasing a problem that turned out to be a bad wire not a faulty switch. But I like the feel of this one with the positive click and the larger style.

November 6, 2018

Product was what expected. One good reason I use Aircraft Spruce is the website is user friendly .

Lee B
July 23, 2018

This is a high quality switch with an aluminum bezel. It takes a relatively good force to press. I understand the rating is a 4lb force to depress. It would be nice to have the option to purchase the 2lb force made by the same company.

Fliar B
March 17, 2018

The switch is of good quality but much too large to fit into the yoke horn as a PTT.

February 11, 2018


Q: For part number 11-00745 what is the diameter size of the button press fit body and is the whole item red or just the actual button?

The diameter size of the button press fit body is 1/2in and the button is red while the body is black.

Q: What does momentary mean? What does press fit mean? What does SPDT mean?

Momentary means you have to hold the switch down to activate it. As soon as you release the switch it turns off. Press fit means that there are no threads and simply pushes into an exact size hole. SPDT means single pole double throw. This is a switch that only has a single input and can connect to and switch between 2 outputs.

Q: Are the two P1 switch terminal posts (or terminal flanges) marked ground & positive?Im not very knowledgeable about these matters. By the way, 1/2 was too small, I drilled a 9/16 into my airplane control yoke & wrapped a piece of scotch tape around the cylinder and the switch fit perfectly and tightly.

No, this switch can be wired in either direction.

Q: For example, otto no. P1-12121 (spruce pn 11-00745) - according to the spec. sheet the first 2 to the right of the hyphen indicates a screw connection not a solder connection, yet your description for all these switches says they have solder connections. The otto no of this switch with a solder connection should be P1-11121. Please confirm whether 11-00745 has a solder or screw connection?

The switch has screw terminals. Included with the switch are screws, lockwashers, and solder lugs.

Q: The item shown P1-32121 - does it require a hole of 5/8?

Yes, this requires a 5/8 mounting hole.

Q: Any reason why this shouldnt work with a 14V system?

No, this should work fine in a 14 volt system.

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