Bulwark Mounted Mooring Chock JIS F 2007 Type A | Oval Opening Cast Steel Rope

Product Specification

Bulwark Mounted Mooring Chock JIS F 2007 Type A | Oval Opening Cast Steel Rope Guide

Product Overview

The JIS F 2007 Type A bulwark mounted mooring chock is a cast steel rope guide with an oval opening. It is welded to the vessel bulwark to guide mooring ropes through the bulwark structure and reduce sharp local contact during berthing, shifting, and harbor mooring operations.

Type A covers nominal sizes 150 to 500. It is suitable when the vessel arrangement requires a longer oval rope opening, more entry tolerance, and clear rope alignment at the bulwark mooring station. The standard name may be mooring pipe, while international buyers often search for bulwark mounted mooring chock or oval mooring chock.

Quick Specifications

• Type: JIS F 2007 Type A oval opening → longer rope passage for bulwark-mounted mooring arrangements.

• Nominal size range: 150 to 500 → wider size coverage than Type B.

• Standard: JIS F 2007-1976 → reference for dimensions, type designation, and standard material basis.

• Standard material: SC42 cast steel according to JIS G 5101 → C-Mn cast steel, stainless steel, or special steel can be discussed.

• Calculated mass: 15.1 to 115 kg → useful for handling, packing, installation, and freight estimation.

• Surface treatment: Sa2.5 blasting + epoxy shop primer for cast steel → stainless steel contact surfaces can be polished when required.

• Manufacturing focus: smooth rope-contact surface, controlled casting quality, weld-zone preparation, and dimensional control.

Main Technical Parameters

Main webpage dimensions for JIS F 2007 Type A mooring chock. Dimensions are in mm unless otherwise stated.

Reference rope diameter should be checked against the vessel mooring arrangement and project specification.

Selection & Inquiry Guide

Step 1: Confirm JIS F 2007 Type A oval opening and nominal size 150 to 500 according to rope diameter and vessel drawing.

Step 2: Confirm bulwark opening, reinforcement, weld length, and available installation space before production.

Step 3: Confirm material requirement: SC42 cast steel, C-Mn cast steel, stainless steel, or special steel.

Step 4: Confirm surface treatment: shop primer, final coating requirement, or polished stainless steel contact surface.

Step 5: Confirm certificate scope before quotation: maker certificate, material certificate, class certificate, or witness inspection.

Step 6: Provide quantity, destination, required delivery time, installation drawing, and reference photos if available.

Structure

Oval rope opening | Cast steel body | Bulwark-mounted welded structure | Smooth rope-contact radius | Welded connection area | Ribs according to nominal size | Shop primer or stainless steel finishing

Design and Quality Advantages

• Oval opening provides a longer rope passage than the round Type B configuration, which helps rope entry where the mooring line angle changes along the bulwark.

• Rope-contact surfaces are dressed and smoothed after casting to reduce sharp local contact and help protect manila rope or wire rope.

• Casting indications are controlled within accepted marine casting criteria. The focus is acceptable casting quality that does not affect performance, welding quality, or inspection acceptance.

• The cast body area within 50 mm of the ship-structure welding zone is specially controlled to reduce harmful indications affecting welding quality.

• For nominal sizes 150 to 300, extra attention is applied to thinner wall and weld-adjacent areas to reduce crack risk during shipyard welding.

• FEA-based review can be used to check stress distribution around the opening edge, ribs, and welded transitions when required by project.

Custom Attributes

• Standard: JIS F 2007-1976 → use when the project specification calls for JIS mooring pipe / mooring chock dimensions.
• Type: Type A oval opening → suitable for longer rope passage through bulwark openings.
• Nominal Size: 150 / 200 / 250 / 300 / 350 / 400 / 450 / 500 → select by rope diameter, hull arrangement, and drawing requirement.
• Material: SC42 cast steel as standard reference → alternative cast steel or stainless steel can be discussed.
• Surface Treatment: Sa2.5 blasting + epoxy shop primer → final coating follows vessel painting specification after installation.
• Weld-Zone Control: 50 mm around welding interface → controlled to reduce harmful indications near the shipyard weld area.

Certificate Requirement: Maker certificate or class certificate according to order → class inspection scope should be confirmed before quotation.

How It Works

Bulwark opening alignment → Rope passes through oval chock → Smooth contact surface guides rope direction → Cast body transfers local contact force to welded bulwark structure → Inspection and coating after installation

Applications

Small service vessels | Tugboats | Barges | Workboats | Cargo vessels | Tankers | Bulwark mooring stations | Harbor mooring arrangements | Newbuilding and replacement projects

Certifications & Advantages

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

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

Drawing & Photos

FAQ

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

A1: Select the nominal size according to rope diameter, oval opening dimensions, bulwark arrangement, and vessel design drawing. The reference rope table is for initial selection only.

Q2: Why choose Type A instead of Type B?

A2: Type A uses a longer oval opening and covers sizes up to 500, so it is more suitable when the rope path needs more entry length and the vessel has a larger bulwark mooring arrangement.

Q3: What quality points should be checked for cast steel Type A chocks?

A3: Key points include dimensional control, smooth rope-contact finishing, casting indication control, 50 mm weld-zone preparation, and certificate scope according to the project requirement.