14 mm Quartz Crystals with Keyhole Electrodes – Polished AT-Cut, for R&D and Custom Mounts

Description

These polished AT-cut quartz crystals feature a keyhole electrode configuration, allowing direct electrical connection via solder or spring clips—ideal for custom mounts, open-frame holders, and experimental setups frequently found in research and development environments.

Engineered by Phillip Technologies, each crystal provides stable frequency performance and a clean, optically polished surface that supports sensitive thin-film measurement, even outside standard deposition hardware. With a 14 mm diameter, they are compatible with most laboratory-built or prototype QCM setups and are frequently used in academic labs, process development, and novel sensor integration.

Keyhole Electrode Design
Unlike standard double-anchor or ring-shaped electrodes, the keyhole configuration provides:

• Exposed side tabs for direct contact

• Easy adaptation to clip leads, solder points, or pogo pin-style probes

• A clean central sensing area, free from metallization or obstruction

This design is especially suited for setups where commercial sensor heads aren’t applicable or where the user needs full control over mounting and electrical interface.

Technical Specifications

• Resonant Frequency: 6.000 MHz ±75 Hz

• Cut Type: AT

• Diameter: 14 mm

• Electrode Type: Keyhole

• Surface Finish: Optically polished (<10 Å RMS)

• Q-Factor: >80,000 typical (in air)

• Temperature Range: Up to 150°C (crystal only; housing-dependent)

• Pack Size: 10 crystals

Packaging Details

To protect the sensitive center zone—where frequency measurement occurs—we use cleanroom-ready packaging engineered to prevent contact or contamination:

• Top Material: Pharmaceutical-grade PETG (rigid and inert)

• Base Tray: Hand-cleaned polystyrene

• No anti-static additives that could leach onto the crystal face

• Designed to avoid any plastic contact within 3 mm of the resonating center

Our packaging is trusted by labs and manufacturers worldwide for its reliability in critical handling situations.

Applications

• R&D environments with nonstandard or prototype mounts

• Educational labs teaching QCM fundamentals

• Sensor development where unique mounting or circuit access is required

• Early-stage product design or process testing

These crystals are often used where versatility and direct access to the electrodes are more important than compatibility with commercial holders.