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Two black DC power adapters, 4.0mm male to 5.5mm female connectors, compact cylindrical form

Unique-Bargains

Unique-Bargains DC Power Adapter 4.0mm x 1.35mm Male to 5.5mm x 2.1mm Female 2pcs Black

SKU CH-6BBT-MR5Z5

Two DC adapters convert a 4.0 mm x 1.35 mm male plug to a 5.5 mm x 2.1 mm female jack for CCTV or small electronics projects

  • Product typePower
  • Connects 4.0mm devices to standard 5.5mm power supplies
  • Two adapters included for spare or dual-device use
  • Compact 41mm length fits tight installation spaces
  • Male-to-female design simplifies CCTV camera wiring
  • Black finish matches common equipment aesthetics

DC adapter for CCTV and small electronics

This DC power adapter converts a 4.0mm x 1.35mm male plug to a 5.5mm x 2.1mm female jack. It is intended for external power sources and on-board transformers in small electronics projects and CCTV applications. The pack contains two black adapters measuring 41mm x 12.5mm.

Replaces mismatched barrel connectors

Use these adapters when a device has a 4.0mm x 1.35mm input but the power supply terminates in a 5.5mm x 2.1mm plug. The jump is worth it to avoid cutting and soldering cables when extending a run or repairing a broken connector. They also suit builders who need a quick gender change for camera installations.

Limited to centre-positive barrel power

The adapter passes only DC voltage through the barrel interface; it does not carry data or signalling. Polarity follows the connected cables, so verify centre-positive wiring before use. The 1.35mm and 2.1mm pin diameters fit the stated sizes only; they will not mate with 2.5mm or other centre-pin variants.

How it compares

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Price $3.99
Cheaper than about 99% of the 864 comparable items (median $15.99).

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Specifications

Product
Brand nameUnique Bargains
Product typePower

Questions about this item

Will the 4.0 mm x 1.35 mm male plug fit my device's power jack?

The adapter's male end measures 4.0 mm outer diameter by 1.35 mm inner diameter; match those dimensions to your device's jack before purchasing.

How do I connect the adapter without damaging the centre pin?

Align the 5.5 mm x 2.1 mm female socket straight onto the male plug and push gently until fully seated; forcing it at an angle bends the delicate 1.35 mm centre pin.

When should I replace these adapters?

Replace them if the black housing cracks, the 4.0 mm male barrel loosens in the jack, or the 5.5 mm female socket no longer grips the mating plug firmly.

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