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DC power connector sizes decide whether a plug fits the jack on a laptop, a light or a router, and the wrong size simply will not fit. The most common barrel size in this guide is the one the kits below share, and the rest of the sizes follow the same measurements. This guide explains those measurements, shows how to match a plug to a jack, and walks through the kits that cover the common sizes.
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DC power connector sizes explained
A DC barrel connector is sized by the outer diameter and the inner diameter of the plug, written as outer by inner in millimetres. The kits in this guide share the 5.5 x 2.1mm size: a 5.5mm outer barrel with a 2.1mm inner pin. That size fits most laptop power adapters, and the tips in the kits below all plug into a 5.5 x 2.1mm jack. The table below lists the sizes in this guide, so you can match the plug in your hand to the jack on the device. See the mounts, cables and connectors guides for the wider cable family.
| Kit | Size | Count | Amazon |
|---|---|---|---|
| Outtag barrel tips | 5.5 x 2.1mm | 34 tips | |
| Minidodoca adapter tips | 5.5 x 2.1mm | 41 tips | |
| Salbsever right-angle jacks | 5.5 x 2.1mm | 8 adapters | |
| Exgoofit pigtail cables | 2.1mm x 5.5mm | 5 pairs |
Step 1: Read the size off the plug
Start with the size printed on the plug or the adapter, written as outer by inner in millimetres. A plug marked 5.5 x 2.1mm has a 5.5mm outer barrel and a 2.1mm inner pin, and that is the size to match. If no size is printed, measure the outer diameter and the inner diameter with calipers and write them down before you shop.
Step 2: Match the plug to the jack
The plug and the jack must agree on each diameter. A 5.5 x 2.1mm plug fits a 5.5 x 2.1mm jack, but it will not fit a jack with a different inner pin, even when the outer barrel matches. Check the size on the device or its manual, and check the tip in the kit before you order: the Outtag and minidodoca kits (on Amazon) below hold 34 and 41 tips in the one size, so they cover the common laptop jack and nothing else.
Step 3: Choose straight or right-angle
A straight plug suits an open jack with room behind it, while a right-angle plug suits a tight space where a straight plug would stick out. The salbsever kit (on Amazon) in this guide has 8 right-angle 5.5 x 2.1mm adapters with a 90-degree bend, made of copper and PC material, for laptops, tablets, LED lights, routers, mini fans and car chargers. Pigtail cables suit wiring jobs instead: the exgoofit set below is a 12V 5A pigtail cable with a 2.1mm x 5.5mm plug, for wiring a device to a power source.
The gear for the job
Matching a DC plug to a jack needs the right size in hand: the tip kits below cover the 5.5 x 2.1mm barrel, the right-angle adapters cover tight spaces, and the pigtails cover wiring.
| # | Product | Solar Score | Buy |
|---|---|---|---|
| 1 |  Outtag 34 DC Barrel Tips | 9.6/10 | Buy on Amazon |
| 2 |  Minidodoca 41 DC Adapter Tips | 9.5/10 | Buy on Amazon |
| 3 |  Salbsever 8 Right-Angle Jacks | 9.4/10 | Buy on Amazon |
| 4 |  exgoofit 18AWG Pigtail 5-Pair | 9.4/10 | Buy on Amazon |
Outtag 34 DC Barrel Tips
A 34-tip universal barrel connector kit in 5.5 x 2.1mm, with a copper core and a 1 year warranty.
Pros
- 34 tips in 5.5 x 2.1mm for laptop power
- Copper core with a durable shell
- Fine internal structure to prevent leakage and poor contact
- 1 year warranty stated
Cons
- All 34 tips share one size; other sizes need another kit
- No right-angle tips in the kit
- Only fits 5.5 x 2.1mm jacks
- Black only
Detailed Review
The listing states 34 DC barrel connector tips in 5.5 x 2.1mm, female jack to male plug, with a copper core and a durable shell, for laptop power adapters and AC adapters. It states a fine internal structure to prevent leakage and poor contact, wide compatibility with most laptop brands, and a 1 year warranty. The kit holds 34 tips and 1 manual.
Who it's for: laptop owners who want one kit that covers the common 5.5 x 2.1mm jack. Who should skip it: owners whose jack uses another size, or who need right-angle tips.
Its Solar Score of 9.6/10 comes from performance 29/35, build 21/25, value 21/25, safety 5/10 and warranty 1/5: 77 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Size | 5.5 x 2.1mm |
|---|---|
| Count | 34 tips |
| Core | Copper |
| Warranty | 1 year |
Taken from the seller's listing on 14 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. Fine internal structure to prevent leakage and poor contact stated, so safety scores 5 of 10. 1 year warranty stated. It does not say everything a buyer needs, such as who pays return shipping, so warranty scores 1 of 5. See How We Pick.
Size and fuse it. Match wire gauge and fuses to the current the maker specifies, keep MC4 connectors matched to the same type, and keep connections dry and strain relieved.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
Minidodoca 41 DC Adapter Tips
A 41-piece universal adapter tip kit in 5.5 x 2.1mm for laptop power supplies.
Pros
- 41 tips, the most in this group
- 5.5 x 2.1mm female base fits laptop power banks and AC adapters
- Portable and compact at 3.0 by 2.0 by 0.5 inches
- Wide compatibility with most laptop brands
Cons
- No warranty term is stated
- All tips share one size
- No right-angle tips in the kit
- One kit in the box
Detailed Review
The listing states 41 universal DC plugs in 5.5 x 2.1mm with a female base, for external laptop DC power batteries and universal AC power adapters, at 3.0 by 2.0 by 0.5 inches. It states wide compatibility with most laptop brands and a portable, compact build for travel. No warranty term is stated.
Who it's for: travellers and laptop owners who want the most tips in one small kit. Who should skip it: buyers who want a stated warranty or right-angle tips.
Its Solar Score of 9.5/10 comes from performance 29/35, build 21/25, value 21/25, safety 0/10 and warranty 0/5: 71 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Size | 5.5 x 2.1mm |
|---|---|
| Count | 41 PCS |
| Dimensions | 3.0 x 2.0 x 0.5 in |
| Base | 5.5 x 2.1mm female |
Taken from the seller's listing on 14 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. This product does not plug in or run on a battery, so safety is not part of its score. No warranty term, so warranty scores zero. See How We Pick.
Size and fuse it. Match wire gauge and fuses to the current the maker specifies, keep MC4 connectors matched to the same type, and keep connections dry and strain relieved.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
Salbsever 8 Right-Angle Jacks
8 right-angle 5.5 x 2.1mm adapters in blue, for tight spaces behind laptops, routers and lights.
Pros
- 90-degree bend suits tight spaces
- Copper and PC material
- Male to female adapter for damaged connectors
- 8 adapters in the box
Cons
- No warranty is stated
- 8 adapters only; a bigger kit needs more
- Blue only
- 5.5 x 2.1mm only; other sizes need another kit
Detailed Review
The listing states 8 right-angle DC power adapters in 5.5 x 2.1mm, blue, with a 90-degree bend from a male plug to a female jack, made of copper and PC material. It states use for laptops, tablets, LED lights, routers, mini fans, hubs, photo players, microcontrollers and car chargers, as a replacement for damaged connectors. No warranty is stated.
Who it's for: owners who need a right-angle plug in a tight space, or a spare for a damaged connector. Who should skip it: buyers who need a full tip kit or a stated warranty.
Its Solar Score of 9.4/10 comes from performance 27/35, build 20/25, value 20/25, safety 0/10 and warranty 0/5: 67 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Size | 5.5 x 2.1mm |
|---|---|
| Count | 8 PCS |
| Bend | 90-degree |
| Material | Copper and PC |
Taken from the seller's listing on 14 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. This product does not plug in or run on a battery, so safety is not part of its score. No warranty term, so warranty scores zero. See How We Pick.
Size and fuse it. Match wire gauge and fuses to the current the maker specifies, keep MC4 connectors matched to the same type, and keep connections dry and strain relieved.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
exgoofit 18AWG Pigtail 5-Pair
A 5-pair set of 18 AWG DC pigtail cables, 12 volts and 5 amps, with 2.1 by 5.5mm connectors and pre-tinned ends.
Pros
- 5 pairs stated
- 18 AWG with 42 copper strands per side stated
- Pre-tinned ends stated
- 30cm total length stated
Cons
- No warranty stated
- 5-amp limit stated
- No boot caps stated
- No UL listing stated
Detailed Review
The listing states a 5-pair set of 18 AWG DC pigtail cables, 12 volts and 5 amps, with 2.1 by 5.5mm connectors, 42 copper strands of 0.15mm per side for 84 strands in a cable, a total length of 30cm or 11.8 inches including connectors, a pigtail part of 26cm or 10.2 inches, pre-tinned ends for easy soldering and better conductivity, 60 watts, and a weight of 3 ounces. The cable stands a maximum of 5 amps due to the thick copper, per the listing.
Who it's for: readers who want pre-tinned pigtails for soldering. Who should skip it: readers who want high current, boot caps, a UL listing or a stated warranty, since none is stated.
Its Solar Score of 9.4/10 comes from performance 26/35, build 21/25, value 21/25, safety 0/10 and warranty 0/5: 68 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Current | 5A |
|---|---|
| Wire | 18 AWG |
| Voltage | 12V |
| Length | 30cm total |
Figures as published on the retailer listing, collected 25 October 2026. Performance figures are manufacturer rated.
Safety and Warranty
What this listing states. No current rating or safety listing is stated, so safety scores zero. No warranty term, so warranty scores zero. See How We Pick.
Size and fuse it. Match wire gauge and fuses to the current the maker specifies, keep MC4 connectors matched to the same type, and keep connections dry and strain relieved.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
As an Amazon Associate I earn from qualifying purchases.
FAQ: power away from the grid
What is the most common DC power connector size?
The 5.5 x 2.1mm barrel, the size every kit in this guide shares. It fits most laptop power adapters, and the tips in the Outtag, minidodoca and salbsever kits all plug into a 5.5 x 2.1mm jack.
How do I measure a DC barrel connector?
Measure the outer diameter and the inner diameter in millimetres. The size is written outer by inner, as 5.5 x 2.1mm, and the plug must match the jack on each diameter.
Will a 5.5 x 2.1mm plug fit any 5.5mm jack?
No. The inner diameter must match too: a 5.5 x 2.1mm plug needs a 5.5 x 2.1mm jack, even when the outer barrel matches.
What are DC pigtail cables for?
Pigtail cables wire a device to a power source. The exgoofit set in this guide is a 12V 5A pigtail cable, 5 pairs, with a 2.1mm x 5.5mm plug.
Do I need a right-angle DC connector?
A right-angle jack suits tight spaces where a straight plug would stick out. The salbsever kit in this guide has 8 right-angle 5.5 x 2.1mm adapters with a 90-degree bend.
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