Marine chocks

GOST25056 Deck Mounted Mooring Chock

  • Material: Cast Steel
  • Nominal Size: 125*90mm to 720*460mm
  • SWL: 63kN to 1600kN
  • Weight:20KG to 780KG
  • Finishing: the mooring chocks shall be coated externally with an anti-corrosion protective finish.
  • Installation site: on the deck


The marine mooring chock is deck mounted type and the manufacturing method should be the requirement of GOST25056 standard. It is a type of ship’s mooring and towing fitting installed on the board to belay the mooring and towing rope, which is widely used in Russia. It is similar to the type B DIN81915 Panama chock but with larger SWL. Therefore, the mooring chock is applied for Russian vessels and boats much more. It is one of the commonest marine mooring chocks in Russia. The yield strength and tensile strength for the material of GOST25056 chock should be more than 216MPa and 412MPa according to the requirements. In China, the material always is cast steel (ZG230-450). And the material should have the heat-treatment in normalization. For the storage of the chocks under the open sky, it should be in holding primer cover.  

Features Of GOST25056 Deck Mounted Chock

Qualified material with normalized heat treatment;
High SWL for mooring and towing;
Wide range of application;
RMRS class approved;
Strict surface treatment requirement.

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.

Machine Specifications

GOST25056 Marine Mooring Chock
Nominal Size Dimensions (mm) SWL Weight
L*W (mm) L1 B H H1 (kN) (kg)
125*90 285 160 260 118 63 20
160*115 360 200 325 150 100 30
200*140 450 250 400 185 160 48
250*180 550 300 500 235 250 85
335*230 725 390 640 305 460 150
400*270 840 440 730 350 640 230
500*320 1020 520 870 420 1000 350
620*400 1240 620 1050 505 1250 560
720*460 1440 720 1200 570 1600 780

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