
Always wanted to know what all those HC/XX designators stand for?
Got some quartz rocks for your radio and don't know which socket you need to buy?
Building an old-style tube transmitter and need some data on the xtals?
Then this is the page you have been looking for (grin)
Note: If anyone has MORE xtal data about the OTHER style rocks,such as CR-1A, FT-171, HC-33/U, HC-49/U etc.,
please e-mail it to me and I will post here!
| Holder Type | Pin Spacing | Pin Diameter | Height | Width | Thickness |
|---|---|---|---|---|---|
| HC-5/U | 0.812 | 0.156 | 2.20 | 1.82 | 1.60 |
| HC-6/U | 0.486 | 0.050 | 0.78 | 0.76 | 0.35 |
| HC-10/U | (Note A) | 0.060 | 1.10 | - | 0.56D |
| HC-13/U | 0.486 | 0.050 | 0.78 | 0.76 | 0.35 |
| HC-17/U | 0.486 | 0.093 | 0.78 | 0.76 | 0.35 |
| HC-18/U | (Note B) | - | 0.53 | 0.40 | 0.15 |
| HC-25/U | 0.192 | 0.040 | 1.53 | 0.76 | 0.35 |
| FT-243 | 0.500 | 0.093 | 1.10 | 0.90 | 0.40 |
All sizes in INCHES
Note A: Uses Barrel Mount
Note B: WIre leads 0.018 in diameter

| Military Type | Holder Used | Type | Resonance |
|---|---|---|---|
| CR-15B/U | HC-5/U | Fundamental | Parallel |
| CR-16B/U | HC-5/U | Fundamental | Series |
| CR-17B/U | HC-10/U | Overtone | Series |
| CR-18A/U | HC-6/U | Fundamental | Parallel |
| CR-19A/U | HC-6/U | Fundamental | Series |
| CR-23/U | HC-6/U | Overtone | Series |
| CR-24/U | HC-10/U | Overtone | Series |
| CR-27/U | HC-6/U | Fundamental | Parallel |
| CR-28A/U | HC-6/U | Fundamental | Series |
| CR-32A/U | HC-6/U | Overtone | Series |
| CR-52A/U | HC-6/U | Overtone | Series |
| CR-53A/U | HC-6/U | Overtone | Series |








