How can it be both mono and stereo? And if so, what 2 pins are used for mono?

"Mono" and "stereo" terms are misleading here. The correct label would be "balanced" and "unbalanced". A "balanced" connection would use all 3 pins, #1 being Ground, #2 being the Hot or positive signal and pin #3 being the Cold or negative signal. An "unbalanced" connection would use only pins #1 and #2, ignoring #3. You could create an "unbalanced" "stereo" connection where pin #1 is ground and common to both "sides", and pin #2 would be "left" and pin #3 would be "right". This would be a typical headphone jack. If you are using this for an instrument cable connection, such as a guitar, use pin #1 as ground and pin #2 as Hot or signal. You would not use pin #3.

Which post is for Tip, Ring, and Sleeve?

I dont remember off the top of my head, but if you have a TRS cable or TS cable, you can plug it in and do a continuity test to find out which is which

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CESS6.35mm 1/4" Female Jack & Socket For Audio Microphone Headphone Cables Connectors (#634: 6.35mm Stereo Socket,4-Pack)

CESS6.35mm 1/4" Female Jack & Socket For Audio Microphone Headphone Cables Connectors (#634: 6.35mm Stereo Socket,4-Pack)

4.4/5

Product ID: 562901097

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Details

Brand
CESS
Connector type
Auxiliary
Cable type
AUX
Compatible devices
Microphone
Special feature
Insulated

🎧6.35mm stereo socket

🔒locking push button

🛡️high impact insulation

Description

🔌 Lock in flawless sound with every connection!

VALUE PACK - Includes 4 connectors, perfect for upgrading your entire audio setup without hassle.
DURABLE BUILD - High-impact plastic casing offers robust protection against wear and tear.
PRECISION FIT - Designed for a 0.928" (23.5mm) panel cutout, guaranteeing easy installation.
UNIVERSAL COMPATIBILITY - Seamlessly supports both TS and TRS audio connections for versatile use.
SECURE LOCKING MECHANISM - Red push-button lock ensures your cables stay firmly connected during critical moments.

The CESS 6.35mm 1/4" Female Jack & Socket set features a durable, fully insulated high-impact plastic casing with a red locking push button for easy identification and secure connections. Compatible with both TS and TRS cables, these panel-mount connectors fit a 0.928" (23.5mm) round hole and come in a convenient 4-pack, ideal for professional audio setups.

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