These Anchors/Fasteners were commonly installed in ships to mount heavy gear (machinery, weapons fittings, or structural reinforcements). The Navy often sourced Red Head brand anchors because they were reliable for vibration-heavy environments at sea.
1 3/4 R:CH-RED HEAD 3172
The marking "1 3/4 R: CH – RED HEAD 3172" identifies the size (1 3/4") and type (CH).
Red Head is a well-known manufacturer of industrial anchors and inserts, often used in naval and shipbuilding applications where secure mounting into steel or reinforced decks was critical.
sleeve-style expansion anchor or fastener housing — the cylindrical shape with a flange is typical of hardware that would be inserted and expanded to lock into place.
