Marine chocks

ISO13728 Panama Chock 

  • Material: Cast Steel
  • Type: Type A & Type B
  • Nominal Size: 310mm to 360mm
  • SWL: Type A: 471kN to 687kN, Type B: 687KN to 775KN
  • Weight: 228KG to 286KG
  • Installation site: Type A: on the deck; Type B: on the bulwark.


The Panama chocks are made according to the ISO 13728 standard and are normally adopted for ships passing through the Panama Canal, which are normally assisted by locomotives using steel towing wire. They meet normal mooring requirements and Panama Canal requirements. The material is steel casting material, having a yield point of not less than 235N/mm2 or equivalent. The carbon contents of the steel casting for ISO13728 chock shall not be more than 0.23% considering weldability. The nominal size of the chock is denoted by reference to the width of the opening, in millimeters, which are 310mm and 360mm. It can be classified as deck-mounted Panama chock and bulwark mounted one according to their installation site. 

The marine chock is an important mooring equipment. There’re different types of mooring chocks with different standards including ISO, JIS, DIN, NS. SWL will be from 8KN to 3000KN according to your requirements. In the process of mooring ship, it bears huge loads. Usually, the ship bollards and mooring chock are for the whole ship mooring use. The general bow and stern of ship block the bollard fairlead, quantity large. Of intermediate section above without or bollards, fairlead rarely. Fairlead is oblique chock more insurance, because it is closed, the cable will not jump out. The triangle chocks are widely used for small boats and different vessels, such as container vessels, tankers, bulk carriers, tug, dry cargo vessels, etc.

Marine mooring chock has two types: deck mounted chock & bulwark mounted chock. The material is casting steel ZG230-450 normally. IACS approved quality to withstand all conditions. Certificated by BV, ABS, LRS, DNVGL, RS, IRS, CCS, KR, NK, etc. We could also provide you with a customized design with CAD drawings.

Drawing of ISO13728 Deck Mounted Panama Chock (Type A)

Drawing of ISO13728 Bulwark Mounted Panama Chock (Type B)

Machine Specifications

ISO13728 Deck Mounted Panama Chock (Type A)
Nominal Size(mm) L l1 l2 H H1 H2 T SWL Weight
(kN) (t)  (kg)
310 310 708 310 260 639 541 32 471 48 257
360 360 760 360 260 640 543 34 687 70 286
ISO13728 Bulwark Mounted Panama Chock (Type B)
Nominal Size (mm) L l1 H H1 H2 T SWL Weight  (kg)
(kN) (t)
310 310 720 260 670 453 25 687 70 228
360 360 770 260 670 456 27 775 79 248

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