Moon Shape Black Turn Button Clip – U21 Complete Guide
The Moon Shape Black Turn Button Clip (SKU: U21) is the dark-finish counterpart to the U20 silver crescent clip. With a 34 mm span and a tighter 12 mm inner chord, it suits smaller round and oval dark-toned frames while providing the same dual-hole locking reliability as the U20.
Why Choose the Moon Shape Black Turn Button Clip?
Dark ebony, walnut, and black-lacquered round frames are increasingly popular in contemporary art display. The U21 Moon Shape Black Turn Button Clip provides a visually consistent hardware solution that matches these dark frame aesthetics while its crescent geometry conforms to curved rabbets perfectly.
Key Dimensions
Total length (span): 34 mm. Span width: 22 mm. Tail width: 2.5 mm. Hole diameter: 2.5 mm × 2. Thickness: 0.4 mm. Inner chord: 12 mm.
Installation
Same as U20. Position crescent inner edge against backing, fasten both holes, rotate 45° to lock. Use 6–8 clips per round frame.
Related Products
For silver crescent see U20 Moon Shape Silver Turn Button Clip. For round disc see U22 Round Disc Metal Turn Button Clip.
Material & Finish
0.4 mm cold-rolled steel, matte black electrophoretic coating.
FAQ
Q: How does U21 differ from U20?
A: 34 mm span (vs 33.5 mm), tighter 12 mm inner chord vs U20’s 21 mm radius.
Q: What frame diameter suits U21?
A: Round frames from 30 mm inner diameter.
Q: Can U21 be used on oval frames?
A: Yes — 4 clips at 90° intervals on the curved sides.
