Bulwark Mounted Mooring Chock JIS F 2007 Type B | Round Opening Cast Steel Rope Guide

Bulwark Mounted Mooring Chock JIS F 2007 Type B | Round Opening Cast Steel Rope Guide

Product Overview

The JIS F 2007 Type B bulwark mounted mooring chock is a cast steel rope guide with a round opening. It is installed on the vessel bulwark to guide mooring ropes through a compact circular opening and provide a smooth contact radius for rope direction control.

Compared with Type A, Type B has a shorter size range from 150 to 300 and a more compact round rope passage. It is suitable for smaller and medium bulwark mooring positions where the vessel drawing requires a circular opening rather than a long oval opening.

Quick Specifications

• Type: JIS F 2007 Type B round opening → compact circular rope guide for bulwark-mounted mooring positions.

• Nominal size range: 150 to 300 → focused on smaller and medium mooring arrangements.

• Standard: JIS F 2007-1976 → reference for Type B dimensions and designation.

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

• Calculated mass: 17.5 to 45.5 kg → useful for handling, packing, installation, and freight estimation.

• Surface treatment: Sa2.5 blasting + epoxy shop primer for cast steel → polishing is normally limited to stainless steel contact surfaces.

• Manufacturing focus: round-opening contact radius, casting soundness, weld-zone control, and thin-wall crack-risk reduction.

Main Technical Parameters

Main webpage dimensions for JIS F 2007 Type B 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 B round opening and nominal size 150 to 300 according to rope diameter and vessel drawing.

Step 2: Confirm whether the bulwark layout requires a compact circular opening rather than the longer Type A oval opening.

Step 3: Confirm bulwark structure, welding condition, and surrounding reinforcement, especially for thin-wall and weld-adjacent areas.

Step 4: Confirm material requirement: SC42 cast steel, C-Mn cast steel, stainless steel, or special steel.

Step 5: Confirm surface treatment, polishing requirement, certificate scope, inspection witnessing, quantity, destination, and delivery time.

Step 6: Provide installation drawing, bulwark structure drawing, or reference photos if available.

Structure

Round rope opening | Cast steel body | Bulwark-mounted welded arrangement | Smooth rope-contact radius | Welded connection area | Ribs according to standard | Shop primer or stainless steel finishing

Design and Quality Advantages

• Round opening provides a compact rope passage where the bulwark arrangement requires a circular guide instead of the longer Type A opening.

• Rope-contact areas are rounded, dressed, and smoothed after casting to reduce sharp local contact and support rope protection.

• Casting quality is controlled within accepted marine casting criteria, with emphasis on performance, welding quality, and inspection acceptance.

• The 50 mm welding-adjacent zone of the cast body is controlled and dressed as required to reduce harmful indications near the weld interface.

• Because Type B is supplied only in sizes 150 to 300, wall-thickness and weld-interface control are especially important during production and installation.

• FEA-based strength review can be used to check stress concentration around the round opening, ribs, and welded support area when required.

Custom Attributes

• Standard: JIS F 2007-1976 → use when the shipyard or design specification requires JIS standard mooring pipe / mooring chock dimensions.
• Type: Type B round opening → suitable for compact circular rope passage through the bulwark.
• Nominal Size: 150 / 200 / 250 / 300 → select by rope diameter, available bulwark space, and vessel drawing.
• Material: SC42 cast steel as standard reference → C-Mn cast steel, stainless steel, or special steel can be discussed.
• Surface Treatment: Sa2.5 blasting + epoxy shop primer → polished finishing mainly applies to stainless steel contact surfaces when specified.
• Weld-Zone Control: 50 mm around welding interface → controlled to reduce harmful indications affecting welding quality.
• Certificate Requirement: Maker certificate or class certificate according to order → class inspection should be confirmed before quotation.

How It Works

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

Applications

Small vessels | Workboats | Tugboats | Barges | Service boats | Bulwark rope openings | Harbor mooring positions | Replacement of JIS F 2007 Type B chocks

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: What is the main difference between JIS F 2007 Type A and Type B?

A1: Type A has an oval opening and covers sizes 150 to 500. Type B has a round opening and covers sizes 150 to 300. The choice depends on rope path, bulwark opening arrangement, and vessel design drawing.

Q2: Why is weld-zone control important for Type B sizes 150 to 300?

A2: Type B sizes are relatively compact and may have thinner wall sections near the weld interface. Controlled casting, dressing, and weld-zone preparation help reduce crack risk during shipyard welding.

Q3: What information is needed before quotation for Type B?

A3: Confirm type, nominal size, material, surface treatment, quantity, certificate requirement, installation drawing, destination, and delivery time. Class inspection scope should be confirmed before quotation.