Bulwark Bolted Casting Steel Mooring Chock | CB 34-76 Type B Ship Mooring

Product Specification

Bulwark Bolted Casting Steel Mooring Chock | CB 34-76 Type B Ship Mooring Equipment

Product Overview

The CB 34-76 Type B bulwark bolted casting steel mooring chock is a ship mooring fitting used to guide mooring ropes through the bulwark area and control the rope lead direction during mooring operation. The Type B design is arranged for bolted mounting on the bulwark, and is suitable for newbuilding, replacement and repair projects where the ship structure and bolt arrangement need to match the standard dimensions or the yard drawing.

The casting body, smooth rope-contact radius, surface finishing, bolt holes, bulwark opening and surrounding ship structure should be checked together during selection. The rope-contact surface should be ground smooth to reduce rope abrasion. The 50 mm contact area around the chock body and ship structure should be free from casting or surface defects that may affect fit-up, seating quality or fastener tightening.

Quick Specifications

• Standard: CB 34-76 → marine mooring chock standard covering Type A, Type B, Type C and Type D.
• Type: Type B bolted type → intended for bulwark installation with rivets or bolts according to the standard table and project drawing.
• Applicable rope range: cable diameter 18.6–43.5 mm, flax girth 160–325 mm, nylon cable diameter 35–90 mm → helps match rope size with chock opening and rope-contact radius.
• Main dimensions: L 200–480 mm, L1 300–685 mm, L2 400–870 mm → core length dimensions for matching the bulwark opening and installation space.
• Bulwark opening dimensions: L3 310–705 mm, B3 240–545 mm → important for shipyard opening preparation and replacement work.
• Bolts or rivets: diameter 12–24 mm, quantity 12 or 16 → final fastener specification should be confirmed with the vessel drawing and class or yard requirement.
• Weight range: 22.6–205 kg → useful for quotation, handling, packing and delivery planning.
• Material options: casting C-Mn steel, cast iron, cast stainless steel or special steel for icebreaker projects → final material grade to be confirmed by order specification.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm the standard and type → CB 34-76 Type B, bulwark bolted mooring chock.

Step 2: Confirm rope size → maximum cable diameter, flax girth or nylon cable diameter according to the vessel mooring arrangement.

Step 3: Confirm main dimensions → L, L1, L2, B, B1, B2 and bulwark opening dimensions L3 × B3 for installation matching.

Step 4: Confirm fastening arrangement → bolt or rivet diameter, quantity, hole matching and whether the existing bulwark opening is for newbuilding or replacement.

Step 5: Confirm material and casting process → casting C-Mn steel, cast iron, cast stainless steel or special steel; wood pattern or lost foam process can be discussed according to order quantity and project requirement.

Step 6: Confirm surface treatment and documentation → sandblasting Sa2.5, epoxy shop primer, ground stainless steel surface finish or custom coating; certificate and inspection scope according to project requirement.

Structure

• Casting body | Smooth ground rope-contact radius | Bulwark opening | Bolt or rivet holes | Seating surface | Surface treatment
• Casting, Installation & Engineering Advantages
• The Type B structure is intended for bolted bulwark installation, so the opening size, bolt-hole arrangement and seating surface must be checked against the shipyard drawing before order confirmation.
• The rope-contact radius should be ground smooth to reduce rope abrasion during mooring rope guiding.
• Wood pattern or lost foam casting process can be selected according to order quantity, surface requirement and project schedule.
• The casting body and the 50 mm contact area around the ship structure should be checked to avoid surface defects that may affect fit-up, seating quality or fastener tightening.
• Finite element strength calculation and structural optimization can be arranged when required for project review, shipyard approval or special vessel application.
• Material, surface treatment and documentation scope should be confirmed according to the vessel type, installation position and classification requirement.

Custom Attributes

• Product Type: Type B bulwark bolted mooring chock → casting body with bolted or riveted installation arrangement.
• Standard: CB 34-76 → suitable when the project specifies CB marine mooring chocks.
• Installation: Bulwark bolted mounting → used where the chock is fastened to the bulwark opening according to the standard and yard drawing.
• Rope Contact Surface: Ground smooth radius → helps reduce rope friction and local abrasion.
• Casting Process: Wood pattern or lost foam process → selected according to quantity, size and surface requirement.
• Engineering Check: FEA review available when required → used for strength verification or optimization under project-specific conditions.

How It Works

Mooring rope approaches the bulwark opening → the ground smooth chock surface guides the rope → rope direction is controlled through the chock opening → load is transferred through the casting body, fasteners and reinforced bulwark structure.

Applications

Cargo vessels | Bulk carriers | Tankers | Workboats | Barges | Tugboats | Shipbuilding projects | Ship repair and replacement | Bulwark mooring stations

Certifications & Advantages

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

Classification certificate, material certificate, inspection record and coating documents are available according to project requirement and subject to class approval scope.

Drawing & Photos

FAQ

Q1: Is CB 34-76 Type B a welded or bolted mooring chock?

Type B is a bolted type for bulwark installation. The bolt or rivet diameter, quantity and hole arrangement should be checked with the vessel drawing before production.

Q2: Why should the rope-contact surface be ground smooth?

The mooring rope passes through the chock during berthing and mooring operation. A ground smooth radius helps reduce friction and local rope abrasion.

Q3: What information is required for quotation?

Please provide the standard and type, rope size, required dimensions or drawing, material, surface treatment, fastener requirement, quantity, certificate requirement, delivery destination and required delivery time.