What is this?

JBP-PA

.
Apr 29, 2022
805
Jeanneau Tonic 23 Erie, PA
We took this off a Pearson Wanderer 30. It was on the catwalk deck about amidships. It is not a stanchion mount, but looks like it was designed to receive some sort of threaded in gadget. The center plug unscrews. The hole does not go through. The hole is 1/2 inch.
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PaulK

.
Dec 1, 2009
1,524
Sabre 402 Southport, CT
Looks like it could be for anchoring a side ladder of some type if it was near the toerail. Otherwise, if mid-deck, it could be for a fixed padeye that could screw into it after you remove the plug. If there another one on the other side they could be for fixed jib sheet blocks for the working jib. South Coast still seems to be in business so you could ask them: Anchors | SouthCoast Marine Products
 
Feb 26, 2004
23,400
Catalina 34 224 Maple Bay, BC, Canada
For those who don't like to click on links:

Barton Flush Mount Deck Plate with Thread

Turned from solid bar 316 stainless steel with a highly polished finish, the deck plates have a centre anchoring hole in three standard metric thread sizes – M8, M10 and M12, each supplied with a stainless steel blanking plug.


Designed to be mounted flush with the deck using three fixing bolts, the sealed internal thread prevents water ingress. The design prevents trip hazards on board when not in use. The range allows for a multitude of uses, to include: temporary fixing eyes, boat tie downs, deck mounted boarding ladders, stand up blocks, davit mounts, life raft holders, dive tanks & other endless uses.