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Flat-back earrings have a smooth disc behind the ear instead of a butterfly clutch with a post sticking out beyond it. They are worth considering if that projecting tip bothers you. For your first purchase, choose a complete stud in a known suitable size; a decorative end alone is not a wearable earring.
How the pieces fit together
A common threadless flat-back has two assemblies: a decorative front with a thin pin, and a hollow post with the rear disc attached. The pin fits inside the post. That leaves a disc against the back of the ear instead of an exposed post tip.
For a first purchase, look for a listing that includes both assemblies. An “end” usually buys the decoration; a “post” buys the part that passes through the piercing. Buying only one makes sense when you already own the compatible other half.
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Threadless or threaded: which do you want?
Threadless fronts use a pin held by tension; internally threaded fronts screw into the post. “Flat back” can describe either. Choose threadless if you prefer a press-fit connection; choose internally threaded if you prefer a screw connection and can comfortably handle a small threaded end. Neither label proves that an earring will fit.
There is a learning step with the tiny parts. Cords Club provides a handling video and describes tension checks for its threadless fronts. Use the instructions for your actual jewelry; do not force a stuck or unfamiliar connection.
The two fit measurements you need
Post thickness and post length do different jobs. Match both to a size that already fits or to a piercer’s recommendation. A familiar-looking decorative front tells you nothing about either measurement.
| Measurement | Meaning | What to do with it |
|---|---|---|
| Gauge / thickness | The width of the post through the piercing. | Match the required gauge; “flat back” is not a size. |
| Wearable length | The space between the front and rear disc. | Use a known suitable length. Too little room and too much spare length create different fit problems. |
| Decorative front | The visible shape and its dimensions. | Use millimeters to judge its scale, especially beside another earring. |
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Read a real listing without mixing up the numbers
Cords Club’s Postage Stamp listing gives an 18-gauge (1 mm) post, 6 mm post length, 4 mm rear disc and a front about 5.4 × 3 mm. The 6 mm figure is the post length, not the size of the decoration. These are product specifications, not a recommendation that 6 mm fits your ear.
The description refers to one stud, while Single/Pair options also appear. Let the selected option and cart quantity settle whether you are ordering one or two complete earrings; ask the store if they disagree.
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When switching makes sense
A flat back directly addresses an exposed tip behind the ear. That is a design advantage if the tip is the thing bothering you, although fit still determines how the whole earring feels. It does not solve an unsuitable metal, a tight post or a decorative front that presses against nearby jewelry.
If your current earrings are comfortable and you like changing them often, there is no need to replace them just to follow the flat-back trend. If you are switching, try the number you actually need before buying a large matching set.
For a new piercing, let the piercer choose the fit
Have a qualified piercer select jewelry for a new or healing piercing. The APP considers dimensions, construction and material together. A store’s default post length or a “hypoallergenic” label cannot do that fitting for you.
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Choose the next detail
Continue with Threadless vs threaded earrings: which closure should you choose?, Earring gauge sizes: what 16g, 18g and 20g actually mean, Flat-back earring post length: how to choose a replacement, Can you mix flat-back earring posts and fronts from different brands?.
Common questions
Does flat back mean screw back?
No. Flat describes the rear disc. A threadless front presses into its post; an internally threaded front screws in. Read the closure description before choosing.
Can I turn my butterfly stud into a flat-back earring?
Usually you need a different complete earring. A butterfly stud has its post attached to the front; the common flat-back design needs a removable front that connects to its own hollow post. Do not buy a flat-back post expecting it to slide onto your existing stud.
Do I need to buy two?
Yes, if the selected listing sells one stud and you want a matching pair. A replacement end or post also needs its compatible counterpart.
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Explore Cords Club
Cords Club is one option if you want decorative flat-back studs. Start with a complete stud in the size you need, and select two if you want a matching pair. If you only need a replacement for another brand, resolve compatibility first.
Shop Cords Club ↗Affiliate linkSources
This guide draws on published product information, not hands-on testing. Sources and check dates are listed below.
- Association of Professional Piercers: jewelry construction and fitSource checked Sep 19, 2026
- Cords Club: Postage Stamp Flat Back Stud listingSource checked Sep 19, 2026
- Cords Club: flat-back closures, sizing and quantitiesSource checked Sep 19, 2026
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