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Detail of a tab and stud, used to mount the engine's thermal insulation, welded onto a hatband.

Picture 1 of 2.

These protruding studs were percussion-welded onto hatbands of the thrust chamber to support and secure insulator panels.

Back in the day, styrofoam stud protectors would be installed over these studs to prevent injury during shipment and handling.

Nozzle extensions were outfitted with nutplates with which to mount the thermal insulation instead of studs.