JIS F2031 Ship Mooring Equipment Roller Pawl Type Chain Cable Stopper

JIS F 2031 Roller Pawl Type Anchor Chain Stopper | 70–132 mm Chain Cable Stopper

Product Overview

The JIS F 2031 roller pawl type anchor chain stopper is a deck-welded cable stopper used in the anchor chain line between the anchor windlass / cable lifter and the hawse pipe or chain pipe arrangement. It is designed to hold the anchor chain against anchor-related tension and to reduce the holding load transmitted back to the windlass after the anchor chain is secured.

This roller pawl type is intended for large anchor chain diameters from 70 mm to 132 mm. The roller supports chain guidance during operation, while the pawl mechanism is used for chain holding according to the vessel’s anchoring procedure. Selection should be confirmed together with chain diameter, chain grade, windlass arrangement, left-hand / right-hand operation, deck foundation, weld detail, load class, and classification requirement.

Quick Specifications

• Product type: roller pawl type anchor chain stopper → chain holding and chain-guiding equipment for ship anchoring arrangements.
• Technical standard: JIS F 2031-1998 → standard reference for cable stoppers used with marine windlasses and anchor capstans.
• Applicable anchor chain diameter: 70–132 mm → suitable for large chain cable arrangements where the vessel drawing specifies roller pawl type.
• Nominal No. range: 73 / 78 / 84 / 90 / 95 / 102 / 107 / 114 / 122 / 132 → select according to chain diameter and project drawing.
• Installation form: welded foundation or forecastle deck installation → deck foundation, weld leg, reinforcement, and chain lead direction must be confirmed.
• Main material options: mild steel, C-Mn steel, stainless steel, casting steel, nodular cast iron, and steel forging → final part-by-part material grade should be confirmed before production.
• Surface treatment: Sa2.5 blasting + one layer epoxy shop primer, galvanized, polished, or customized finish → final protection system follows project corrosion and coating requirements.
• Calculated mass range: 932–4840 kg → important for deck foundation design, workshop handling, lifting during installation, packing, and freight planning.

Main Technical Parameters

Selection & Inquiry Guide

• Step 1: Confirm JIS F 2031 roller pawl type chain cable stopper and nominal No. according to the vessel anchor chain diameter.
• Step 2: Confirm anchor chain grade, chain cable drawing, windlass / cable lifter position, hawse pipe position, and left-hand or right-hand operating arrangement.
• Step 3: Confirm design load basis, required load class, test load, acceptance criteria, FEA requirement, and whether class witnessing is required.
• Step 4: Confirm forecastle deck foundation, weld leg, deck reinforcement, installation space, chain lead direction, and any shipyard installation restrictions.
• Step 5: Confirm material route for body, roller, pawl, axles, bush, washer, and welded foundation; different parts may require different material grades.
• Step 6: Confirm surface treatment: shop primer, final coating, galvanized finish, polished finish, or customized protection system.
• Step 7: Provide quantity, delivery destination, required delivery time, class certificate requirement, GA drawing, foundation drawing, and reference photos if available.

Structure

Welded side frame / body | Anchor chain passage | Roller assembly | Pawl locking mechanism | Pawl axle | Roller axle | Bush and washer | Deck foundation welding area | Shop primer, galvanized, polished, or customized surface finish

Anchoring, Structure & Engineering Advantages

• Roller pawl configuration combines chain guidance and mechanical chain holding, which is useful where the anchor chain must be aligned between the windlass and hawse pipe while also being secured after anchoring.
• The roller arrangement helps guide the chain cable through the stopper and can reduce harsh local contact compared with a non-roller holding arrangement, subject to correct chain alignment.
• The pawl mechanism provides a defined chain holding interface. Pawl seating, chain pitch compatibility, operating clearance, and contact area should be checked against the actual chain cable specification.
• The welded foundation transfers anchor chain load into the ship structure instead of relying on the windlass to hold the anchor load. Deck reinforcement and weld detail should be confirmed by the shipyard or design office.
• The nominal range from No. 73 to No. 132 covers large chain diameters; the increasing body size and mass should be considered for installation lifting, deck access, and foundation strength.
• FEA-based strength calculation can be provided according to project requirement to review stress distribution around the pawl seat, roller axle area, side frame, and welded foundation.
• Pull test, load test, NDT, and class witness inspection can be arranged according to agreed inspection scope; test load and acceptance criteria must be confirmed before quotation.

Custom Attributes

• Standard: JIS F 2031-1998 → use when the shipyard or owner specification calls for JIS cable stopper dimensions and arrangement.
• Product Category: anchor chain stopper → anchoring deck equipment for chain cable holding, not a mooring chock or rope fairlead.
• Type: Roller pawl type → combines roller-guided chain passage with pawl-type chain holding.
• Applicable Chain Size: 70–132 mm → select according to actual anchor chain diameter and chain grade.
• Nominal No.: 73 to 132 → match the nominal No. with the applicable chain diameter and vessel drawing.
• Mounting: welded deck foundation or forecastle deck installation → foundation drawing and deck reinforcement should be confirmed before production.
• Material Options: mild steel / C-Mn steel / stainless steel / casting steel / nodular cast iron / steel forging → final material grade and part allocation are to be confirmed.
• Surface Treatment: Sa2.5 blasting + epoxy shop primer / galvanized / polished / customized → final surface protection follows project requirement.
• FEA Review: available according to project requirement → used to check local stress and load path when required by the shipyard, owner, or class.
• Pull Test / Load Test: available according to project requirement → test method, load value, holding time, and witness scope must be confirmed.
• Certificate Requirement: available upon request and subject to order scope → maker certificate, material certificate, class certificate, or witness report should be agreed before production.

How It Works

Anchor chain runs between the windlass and hawse pipe → Roller guides the chain cable through the stopper → Pawl is engaged when the chain needs to be secured → Anchor chain load is transferred through the stopper body and welded foundation to the reinforced ship structure → Windlass holding load is reduced after the chain is properly secured

Applications

Forecastle deck anchoring arrangement | Anchor windlass system | Large anchor chain cable route | Ocean-going vessels | Bulk carriers | Tankers | Container vessels | Engineering vessels | Newbuilding and replacement projects

Certifications & Advantages

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

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

Drawing & Photos

FAQ

Q1: Is this product a mooring equipment item or an anchoring equipment item?

A1: It should be treated as anchoring deck equipment. It is used in the anchor chain line to hold and guide the anchor chain. It is not a rope mooring chock, fairlead, bollard, or lifting device.

Q2: How should the correct nominal No. be selected?

A2: Select the nominal No. according to anchor chain diameter, chain grade, windlass arrangement, hawse pipe position, chain lead direction, stopper hand, deck foundation, and the vessel design drawing. The webpage table is for initial model selection and quotation confirmation.

Q3: Can FEA, pull test, and class certificate be provided?

A3: Yes, they can be arranged according to project requirement and order scope. The design load basis, test load, acceptance criteria, inspection method, and witness requirement should be confirmed before quotation and production.