Hi stuman,
I dont think there is an option for a copper SFP for this port. Based on the hardware guide:
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Note that the HA control port supports only the following transceivers:
-
EX-SFP-1GE-LH
-
EX-SFP-1GE-LX
-
EX-SFP-1GE-SX
-
EX-SFP-1GE-SX-ET
-
QFX-SFP-1GE-LX
-
QFX-SFP-1GE-SX
-
SRX-SFP-1GE-LH
-
SRX-SFP-1GE-LX
-
SRX-SFP-1GE-LX-ET
-
SRX-SFP-1GE-SX
-
SRX-SFP-1GE-SX-ET
Ref: https://www.juniper.net/documentation/en_US/release-independent/junos/topics/topic-map/srx1500-chassis.html
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None of the above are copper SFPs and those are the part number of the supported ones.
Hope this helps.