Marine Deck Welded Mooring Chock | CB34 Type C Casting Steel Rope Guide for Vessels

Product Overview

The CB34 Type C marine deck welded mooring chock is a casting steel rope guide installed on deck to lead mooring ropes into a controlled direction. Compared with simple plate-built rope openings, this type uses a cast body with rounded rope-contact surfaces, helping reduce sharp contact, local rope wear, and unstable rope guidance during small vessel mooring operations.

This product page focuses on deck installation, casting quality, smooth rope-contact geometry, and weld-area control. For carbon-manganese casting steel, the rope-contact area is dressed and ground smooth before blasting and primer coating. For stainless steel versions, the contact surface can be polished according to project requirement. Casting surface indications such as minor pores or inclusions shall be controlled within accepted marine casting inspection limits and shall not affect service performance. Within 50 mm of the weld connection area between the cast body and deck structure, defects affecting welding quality shall be avoided or repaired according to the applicable procedure.

The product follows CB34-76 Type C dimensions. Finite element analysis can be used for structural optimization or project verification when required by the shipyard, designer, or classification society.

Quick Specifications

• Product type: CB34 Type C deck welded mooring chock → casting steel rope guide for deck-mounted mooring arrangements.
• Installation: welded on deck → not intended for bulwark installation.
• Standard: CB34-76 Type C → standard dimensional basis for this product series.
• Material: casting C-Mn steel or casting stainless steel → special steel grades can be discussed for ice-class or special service vessels.
• Applicable rope size: steel wire rope 15–43.5 mm / flax rope girth 125–325 mm / nylon rope diameter 30–90 mm → select the model according to the actual mooring rope.
• Overall size range: L 150–500 mm / L1 400–880 mm / B 110–350 mm / H 250–589 mm → useful for checking deck space and welding arrangement.
• Weight range: 37.5–296 kg → affects handling, packing, and installation planning.
• Surface treatment: Sa2.5 blasting + epoxy shop primer for carbon steel → stainless steel version can be polished where required.
• Quality focus: smooth rope-contact surface, controlled casting indications, weld-adjacent area quality, and optional FEA verification.

Main Technical Parameters

Note: The table keeps the main rope selection parameters and principal outline dimensions for website use. Detailed construction dimensions such as local wall thickness, edge radius, and small fillet dimensions should be checked together with the standard drawing or approved GA drawing when preparing production or shipyard installation drawings.

Selection Guide

Step 1: Confirm rope type and size: steel wire rope diameter, flax rope girth, or nylon rope diameter shall match the corresponding model range.

Step 2: Confirm deck installation space: check L, L1, B, B1, H, and H1 against the available deck area and nearby structures.

Step 3: Confirm material and surface finish: choose C-Mn casting steel with blasted and primed surface, or stainless steel with polished contact surface when corrosion appearance or special service is required.

Step 4: Confirm inspection and certificate requirement: advise the required class society, material certificate, inspection level, and whether FEA verification is required.

Structure

• Cast rope-contact body | Deck welded base | Rounded rope passage | Smooth dressed contact surface | Weld-adjacent quality control area | Optional stainless steel polished contact surface
• Casting, Installation and Quality Advantages
• Cast body geometry provides a continuous rounded rope passage and reduces sharp local contact with mooring ropes.
• Wood pattern or lost-foam casting process can be selected according to quantity, dimensional control, and surface finish requirement.
• Rope-contact surfaces are dressed and ground smooth for carbon steel versions; stainless steel versions can be polished where required.
• Casting indications such as pores or inclusions are controlled within accepted marine casting inspection limits and shall not affect product performance.
• The 50 mm weld-adjacent area is controlled to avoid defects that may affect welding quality between the chock body and deck structure.
• Deck welded installation provides a strong and clean connection when combined with proper deck reinforcement and approved welding procedure.
• Finite element analysis can be provided for structural optimization or project review when required.

Custom Attributes

• Standard: CB34-76 Type C → use this field when the vessel drawing or shipyard specification calls for CB34 Type C mooring chock.
• Installation: Deck welded → suitable for deck-mounted mooring rope guidance.
• Material: Casting C-Mn steel / casting stainless steel / special steel to be confirmed → select according to vessel service environment and project requirement.
• Rope size: Steel wire rope 15–43.5 mm / flax rope girth 125–325 mm / nylon rope 30–90 mm → used as the main model selection basis.
• Surface treatment: Sa2.5 blasting + epoxy shop primer / stainless steel polishing → confirm before quotation.
• Inspection: Manufacturer inspection / class inspection to be confirmed → certificate scope shall follow project requirement.
• FEA verification: Available when required → useful for special projects or customer engineering review.

Inquiry Guide

• Required standard and type: CB34-76 Type C, or provide drawing if different.
• Rope type and size: steel wire rope diameter, flax rope girth, or nylon rope diameter.
• Material requirement: casting C-Mn steel, stainless steel, or special steel grade.
• Surface treatment requirement: primer coating, final paint system, or stainless steel polishing.
• Quantity and vessel type: newbuilding, repair, small vessel, workboat, tug, barge, or other application.
• Installation drawing or deck arrangement drawing, if available.
• Required certificate: Maker’s Test Certificate, material certificate, or class certificate.
• Delivery destination and required delivery time.

How It Works

• Deck welding and reinforcement → Rope enters the rounded chock opening → Contact surface guides the mooring rope direction → Smooth radius reduces local rope abrasion → Mooring load is transferred through the welded deck structure
• Applications
• Small vessels | Workboats | Tugs | Barges | Fishing vessels | Service boats | Deck mooring arrangements requiring CB34 Type C welded chock

Certifications & Advantages

Certification can be arranged according to project requirement, inspection scope, and class society approval procedure.

Certification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA, CRS, Makers Test Certificate.

Drawing & Photos

Ordering

• Confirm CB34-76 Type C model or provide the vessel drawing item number.
• Confirm rope type and size for model selection.
• Confirm material, surface treatment, and whether stainless steel polishing is required.
• Confirm quantity, required certificate, and inspection scope.
• Confirm delivery destination, packing requirement, and required delivery date.

FAQ

Q1: How should the correct CB34 Type C mooring chock size be selected?

A1: The size should be selected according to the actual mooring rope type and size. The table gives the maximum steel wire rope diameter, flax rope girth, and nylon rope diameter for each model. Deck space and installation drawing should also be checked before ordering.

Q2: Can the CB34 Type C mooring chock be supplied in stainless steel?

A2: Yes. The standard product can be supplied in casting C-Mn steel, and stainless steel can be discussed when corrosion resistance, appearance, or special service conditions require it. Polishing is normally applied only to stainless steel contact surfaces when specified.

Q3: What quality points should be checked for a casting steel deck welded mooring chock?

A3:Key points include smooth rope-contact surface, casting indications controlled within accepted marine casting limits, no weld-affecting defects within the 50 mm weld-adjacent area, correct outline dimensions, proper surface treatment, and certificate scope matching the project requirement.

Important Engineering Notes

• This product is intended for deck welded installation. Deck reinforcement and welding details shall be confirmed by the shipyard or designer according to the vessel structure.
• Casting surface indications shall be evaluated according to the applicable inspection standard and class requirement. Acceptable indications shall not affect strength, welding, or service performance.
• For carbon steel products, the contact surface is dressed and ground smooth before coating. For stainless steel products, polishing can be specified when required.
• Class certificates, material certificates, and inspection attendance shall be confirmed before order because certificate cost and lead time may vary.