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U31-Plastic Wire Turn Button Clip (Black)
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Get quoteThe Medium Clear Plastic Melon-Seed Turn Button Clip (SKU: U28) is the 20 mm transparent backing clip in XKY Framing’s invisible-hardware series. With a standard 3 mm hole and 1.2 mm body, it provides reliable medium-frame backing retention that remains visually unobtrusive on light or transparent mounting surfaces.
As frame sizes grow beyond 30 × 40 cm, backing clips become more visible from oblique viewing angles. The U28 Medium Clear Plastic Melon-Seed Turn Button Clip’s optical clarity ensures it remains inconspicuous even at close inspection distances, making it the hardware of choice for high-end transparent and light-toned frame assemblies.
Total length: 20 mm. Head width: 6 mm. Tail width: 6 mm. Hole diameter: 3 mm. Thickness: 1.2 mm.
Pre-drill 3 mm hole. Seat backing. Align clip. Fasten with M3 × 8 mm panhead screw. Rotate to lock. Clear body becomes nearly invisible against white or acrylic backing.
For small clear see U27 Small Clear Plastic Melon-Seed Turn Button Clip. For large clear see U29 Large Clear Plastic Melon-Seed Turn Button Clip.
Clear polycarbonate/ABS, 1.2 mm body thickness.
Q: How does U28 differ from U27?
A: 4 mm longer, 3 mm hole (vs 2.5 mm), slightly thinner at 1.2 mm.
Q: Best screw for U28?
A: M3 × 8 mm panhead for optimal engagement and minimal visibility.
Q: Can U28 be painted?
A: Yes. Acrylic or polycarbonate spray paint adheres well for colour-matching.
| SKU | U28 |
|---|---|
| Product Type | hardware |
| MOQ | 100 |
| Lead Time | 7-10days |
| Overview | <p>The U28 Medium Clear Plastic Melon-Seed Turn Button Clip extends the transparent clip series to 20 mm, providing invisible backing retention for medium-sized frameless displays, acrylic frames, and light-toned picture frames.</p> |
| Highlights | Clear Mid-Size Clip |
| Custom Packaging | Yes |
| Material | Plastic (Clear ABS/Polycarbonate) |
| Color | Clear / Transparent |
| Total Length | 20 mm |
| Width (Head) | 6 mm |
| Width (Tail) | 6 mm |
| Hole Diameter | 3 mm |
| Thickness | 1.2 mm |
| Arch Height | N/A |
| Size Grade | Medium (??) |
| Shape | Melon-Seed (???) |
| — | 11 |
|---|
How does U28 differ from U27?
U28 is 4 mm longer (20 mm vs 16 mm), has a 3 mm hole versus U27's 2.5 mm, and is slightly thinner at 1.2 mm versus U27's 1.5 mm.
What is the best screw for U28's 3 mm hole?
A standard M3 × 8 mm panhead screw provides the best combination of engagement depth and minimal head visibility.
Can U28 be stained or painted?
Yes. Standard acrylic or polycarbonate spray paint adheres well, allowing colour-matching to any backing board colour.

Factory direct
Request quote for pricing
Available — request lead time
Get quote
Factory direct
Request quote for pricing
Available — request lead time
Get quote
Factory direct
Request quote for pricing
Available — request lead time
Get quote
Factory direct
Request quote for pricing
Available — request lead time
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