Are the internal contacts gold plated, or just the visible ring in front?

Just the ring up front. The internal connections are a silver colored metal for soldering.

The pictures in the ad show 3 terminals on the back, the jacks i received have 4. How do i determine which is which??

I don’t recall mine having 4 connection terminals.. but when in doubt, use the continuity setting on a volt/ohm meter to determine which wire/connection is which. If you don’t know how to do that, ask the Internet.

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Longdex3.5mm Stereo Panel Mount Jack 3PCS 3.5mm 1/8Inch Mini Female Stereo Panel Mount Solder Headphone Socket Connector

Longdex3.5mm Stereo Panel Mount Jack 3PCS 3.5mm 1/8Inch Mini Female Stereo Panel Mount Solder Headphone Socket Connector

Product ID: 403321254

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Details

Compatible devices
Cellphone
Specific uses for product
Speaker
Connector type
Auxiliary
Item dimensions L x W x H
19 x 8 x 13
Brand
Longdex

⚡1A current capacity

📏8mm panel mount hole

🔌12V DC voltage rating

Description

🎧 Plug into perfection — your audio setup’s secret weapon!

DURABLE BUILD - Constructed with quality plastic and copper for long-lasting performance
COMPACT LIGHTWEIGHT - Only 1.93 x 0.79 x 1.27 cm and 18g—minimal footprint, maximum efficiency
RELIABLE POWER HANDLING - Supports up to 12V DC and 1A current for stable audio connections
UNIVERSAL COMPATIBILITY - Ideal for mobile phones, MP3/MP4 players, and other audio devices
SEAMLESS PANEL INTEGRATION - Fits perfectly with an 8mm mounting hole for sleek, professional setups

The Longdex 3.5mm Stereo Panel Mount Jack is a compact, durable female audio socket designed for panel mounting with an 8mm hole. Rated for 12V DC and 1A current, it ensures reliable connectivity for mobile phones, MP3/MP4 players, and other audio devices, making it an essential upgrade for professional and DIY audio projects.

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Product Dimensions	1.93 x 0.79 x 1.27 cm; 18 g
Item model number	SPMJACK-3.5MM-2
Other display features	CE
Item Weight	18 g

Longdex3.5mm Stereo Panel Mount Jack 3PCS 3.5mm 1/8Inch Mini Female Stereo Panel Mount Solder Headphone Socket Connector

Details

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