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Crystals HC-6/U Size for the 11 Meter Band 26.256 to 27.995 MHz Used / Tested

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MPN:
HC-6/U
Condition:
Used
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$15.00
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Description

Crystals HC-6/U Size for the 11 Meter Band 26.256 to 27.995 MHz Used / Tested

 This Group of Crystals have been tested with my custom crystal checker. Each crystal is listed and marked with the actual frequency as many used crystals tend to drift a bit over time.

Most are mil spec (CR-18/U) and all are in the HC-6/U package.

 They are the larger size crystal nearly 3/4 in wide. The precise specifications are below. 

Most are in excellent cosmetic condition, and some have patina from age.

 All come with a satisfaction guarantee.

 Please pick the crystals you need and add them to the shopping cart one at a time.

I have at least one of each listed and some multiples. The web site will not let you add more than I have in stock.

 

Physical Characteristics and Holder
  • Holder/Case Type: Rectangular metal can (cold-welded or soldered seam), hermetically sealed for environmental protection (shock, vibration, humidity).
    • Pins: Two thin wire pins (diameter ≈0.050 inches / 1.27 mm), spaced 0.486 inches (≈12.34 mm) apart — plugs directly into standard crystal sockets.
    • Dimensions (approximate, maximums per mil specs and common datasheets):
      • Height (body, excluding pins): ≈0.78–0.80 inches (19.8–20.3 mm).
      • Width: ≈0.76 inches (19.3 mm).
      • Thickness/Depth: ≈0.35 inches (8.9 mm).
      • Pin length: Typically 0.2–0.3 inches protruding (varies).
  •  
The HC-6/U (often written as HC6/U or HC-6/U) is a classic military-standard quartz crystal holder (enclosure/case type) widely used from the mid-20th century through the 1980s–1990s. It falls under U.S. military specifications like MIL-H-10056 (for holders) and MIL-PRF-3098 (general requirements for quartz crystal units). The "/U" suffix denotes the standard utility version for general-purpose applications.It's essentially the same physical package as the CR-18/U (and equivalents like CR-23/U, CR-27/U, etc.) you asked about previously — many military crystals marked CR-18/U or CR-18A/U are housed in an HC-6/U case. The CR- designation refers to the specific crystal unit type under MIL specs, while HC-6/U describes the holder itself.
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