Closed Chock (Panama Chocks)

Closed chocks, also known as Panama chocks, are cast steel fittings designed to guide mooring ropes and wires safely through the vessel’s hull structure. They play a critical role in mooring, towing, and anchoring operations, ensuring safe rope handling and load distribution.

At Adamar Anchor & Chain, we supply class-certified closed chocks in accordance with ISO 13729, maintaining ready stock for both deck-mounted and bulwark-mounted types.

Deck-Mounted Closed Chocks (ISO 13729)

These chocks are designed for installation on the deck and are paired with specially fabricated steel-welded seats according to ISO 23113.

Each chock and seat set is welded together in our ABS-certified Adamar Workshop, ensuring perfect alignment and quick onboard installation — the vessel’s welder can directly fix them to the deck with minimal preparation.

Seats act as foundations for deck-mounted chocks. We fabricate these foundations in-house, ensuring exact compatibility with the chocks. The assembly process guarantees durability, correct geometry, and ease of deck welding during vessel installation.

Typically positioned at the centerline of the forecastle deck, bulwark-mounted chocks are directly welded into the vessel’s bulwark plating. This design provides an efficient and secure rope lead while maintaining a clean deck layout.

Technical Data

Bulwark Mounted Closed Chock – DIMENSIONAL TABLE (mm)
L	H	D	d1	d2	L1	L2	H1	H2	T	SWL	Weight
300	250	286	144	100	638	554	588	410	16	43 t	100 kg
350	250	333	168	120	736	646	636	449	18	56 t	141 kg
450	250	381	192	120	834	786	684	450	20	72 t	194 kg
400	250	428	216	120	882	778	732	515	22	90 t	264 kg
450	250	428	216	120	932	828	732	515	22	93 t	276 kg
500	400	525	264	120	1078	978	978	701	24	118 t	408 kg

Deck Mounted Closed Chock – DIMENSIONAL TABLE (mm)
L	H	D	d1	H1	H2	H3	L1	L2	L3	L4	T	SWL	Weight
300	250	286	144	551	481	144	614	565	89	330	26	43 t	142 kg
350	250	333	168	601	525	168	716	660	114	403	30	56 t	222 kg
450	250	381	192	652	553	192	870	804	164	524	36	72 t	322 kg
400	250	428	216	701	609	216	870	796	139	500	38	90 t	434 kg
450	250	428	216	701	609	216	920	846	164	550	38	93 t	452 kg
500	400	525A	264	948	825	264	1068	1000	193	652	40	118 t	724 kg

Seats For Deck Mounted Closed Chock Type-A – DIMENSIONAL TABLE (mm)
Nominal Size				Dimensions and SWL
L	H	D	B	L	L1	L2	L3	T	T1	SWL	Weight
300	250	286	351	644	112.5	356	31.5	16	16	43 t	136 kg
350	250	333	398	746	121.5	433	35	16	22	56 t	179 kg
450	250	381	446	900	131	560	39	18	24	72 t	244 kg
400	250	428	493	900	139	538	42	20	30	90 t	297 kg
450	250	428	493	950	139	588	42	20	30	93 t	310 kg
500	400	525A	590	1098	165	692	38	22	32	118 t	416 kg