013-0054-00
The Tektronix 013-0054-00 is a BNC to probe tip adaptor for early probes, like the P6006, that have a #6-32 threaded probe tip connection. It does NOT screw onto the probe; it's a push-on adapter.
Note that some have the center probe contact split into halves and some into quarters. See the 2nd photo below.
Pictures
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BNC to #6-32
Probe Tip Adaptor -
Different Center Contacts
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Shipping/Inspection Tag
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Data Sheet