Established 2004CE Certified Engineering1-Hour WhatsApp ResponseProduction Rhythm Focus

U21

U21-Moon Shape Black Turn Button Clip

Industrial machinery

Request a quote

Factory-direct pricing · EXW Yiwu

Available — confirm lead time with sales

  • Category: Picture Framing Hardware / Turn Buttons / Retainer Clips
  • MOQ: 100
  • Lead time: 7-10days
Get custom quote within 2 hours

Description

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.

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.

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.

Same as U20. Position crescent inner edge against backing, fasten both holes, rotate 45° to lock. Use 6–8 clips per round frame.

For silver crescent see U20 Moon Shape Silver Turn Button Clip . For round disc see U22 Round Disc Metal Turn Button Clip .

0.4 mm cold-rolled steel, matte black electrophoretic coating.

Application Scenarios

U21-Moon Shape Black Turn Button Clip serves gallery, retail, and e-commerce frame assembly where reliable hanging hardware, connectors, and finishing accessories determine customer satisfaction. Installers and production teams specify quantities per frame size and mounting environment (wall, easel, security fixings).

Wholesale buyers and contract framers source these parts for bulk trade packs — consistent plating, thread standards, and carton counts reduce picking errors on fast-moving SKUs. The product suits both workshop stock and export cartons bundled with finished frames.

When specifying picture framing hardware for a new product line, use this page to confirm dimensions, finish options, and factory-direct MOQ before placing a trial order with XKY Framing.

Key Specifications

Key specification data for U21-Moon Shape Black Turn Button Clip is listed for procurement and compatibility checks. Confirm carton quantities and labeling requirements when ordering for export or private-label programs.

  • MOQ: 100
  • Lead time: 7-10days
  • Material: Metal (Steel)
  • Color: Black
  • Total Length: 34 mm
  • Width (Head/Span): 22 mm
  • Width (Tail): 2.5 mm
  • Hole Diameter: 2.5 mm (×2 holes)

Engineering teams should cross-check these parameters against your existing line layout — air pressure, power supply, and throughput figures determine whether this SKU slots into an existing station or requires a standalone footprint. Request a dimensional drawing or datasheet via the quote form if your facility plan is already frozen.

OEM Customization & Support

XKY Framing manufactures hardware with OEM and private-label options: custom voltage, pneumatic hookups, tooling sets, multilingual manuals, and export crating. Importers serving North America, Europe, and Asia-Pacific can align documentation with local electrical and safety expectations during the quote stage.

Standard lead times apply to catalog configurations; larger framing lines or repeat annual programs may qualify for revised MOQ and scheduled production slots. Submit your target price band, annual volume, and destination port — U21-Moon Shape Black Turn Button Clip quotes include EXW Yiwu pricing with optional freight coordination through our logistics partners.

Quality & Factory Direct Supply

XKY Framing operates as a CE-oriented framing equipment manufacturer based in Yiwu, China, supplying workshops and OEM partners in North America, Europe, and Asia-Pacific. Each catalog SKU is supported by factory-direct communication — engineering clarifications, spare parts, and documentation without distributor layers.

Quality control for U21-Moon Shape Black Turn Button Clip follows incoming material checks, in-process inspection, and pre-shipment review with photos available on request. We align with buyers who need repeatable specifications across repeat orders, private-label cartons, or integration into a broader picture framing production line sourced from a single vendor.

Ordering & Delivery

Request a formal quotation by email or through the on-page quote form — include quantity, destination country, and any voltage or labeling requirements. XKY Framing responds with EXW unit pricing, estimated lead time, and optional FOB Ningbo/Shanghai terms for consolidated sea freight.

Hardware SKUs ship in trade inner packs and export cartons with weight and dimension labels for freight forwarder booking. First-time importers receive packing list samples and commercial invoice templates suitable for customs clearance. Repeat buyers can align annual call-off schedules once baseline quality and logistics are approved.

For U21-Moon Shape Black Turn Button Clip, trial orders and sample units are available on selected SKUs before you commit to container volumes. Ask our sales team about compatibility with your existing framing line when ordering mixed equipment and accessory SKUs in the same shipment.

Specifications

SKUU21
Product Typehardware
MOQ100
Lead Time7-10days
Overview<p>The U21 Moon Shape Black Turn Button Clip mirrors the U20 crescent design in matte black finish with a slightly increased 34 mm span and 12 mm inner chord, suitable for dark-toned round or oval frames.</p>
Custom PackagingYes
MaterialMetal (Steel)
ColorBlack
Total Length34 mm
Width (Head/Span)22 mm
Width (Tail)2.5 mm
Hole Diameter2.5 mm (×2 holes)
Thickness0.4 mm
Arch Height12 mm inner chord
Size GradeStandard
ShapeCrescent / Moon
Key specs
—11

FAQ

How does U21 differ dimensionally from U20?

U21 has a 34 mm span versus U20's 33.5 mm, and a 12 mm inner chord versus U20's 21 mm inner radius. U21 has a tighter, more pronounced crescent curvature.

What frame diameter suits U21?

U21's tighter curvature suits round frames from 30 mm inner diameter, slightly smaller than U20's 42 mm minimum.

Can U21 be used on oval frames?

Yes. Position each clip perpendicular to the oval's long axis on the curved sides. Use 4 clips per oval frame at 90° intervals.

Can this machine be customized?

Yes. U21 supports OEM customization including voltage (110V/220V/380V), pneumatic requirements, tooling, and export packaging. Share your moulding profile, daily output target, and destination market — our engineering team will confirm a factory-direct specification and lead time.

Do you provide overseas technical support?

Yes. XKY Framing provides remote commissioning guidance, spare parts supply, and video troubleshooting for hardware installations worldwide. For larger framing lines we can arrange on-site support by appointment. Contact us with your order reference for dedicated after-sales assistance.

The Range

View all in Picture Framing Hardware / Turn Buttons / Retainer Clips →

More Like This

Resources

CECertified machinery
2004Manufacturing since
50+Export markets served

More Picture Framing Hardware / Turn Buttons / Retainer Clips from XKY — compare specs and request factory-direct pricing.

View all in this category →

Next steps

Weekly industrial framing equipment insights

Prefer chat? WhatsApp sales