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.

Category: Mooring Equipment

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Deck-Mounted Closed Chocks

ISO 13729:2020

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.

Datasheet Download

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 Technical

Seats for Closed Chocks

ISO 23113:2020

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.

Datasheet Download

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

Bulwark-Mounted Closed Chocks

ISO 13729:2020

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.

Datasheet Download

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