Roller Pawl-Type Anchor Chain Stopper for 70–132 mm Chain | JIS F 2031:1998

Product Specification

Roller Pawl-Type Anchor Chain Stopper for 70–132 mm Chain | JIS F 2031:1998

Product Overview

The JIS F 2031:1998 roller pawl-type anchor chain stopper is an anchoring deck fitting used to hold and guide the anchor chain independently of the windlass. The supplied dimensional table corresponds to Annex 4 C Form, which is the roller pawl arrangement with a chain guide. It is intended mainly for JIS F 3303 Grade 2 and Grade 3 anchor chains and is arranged in the anchor-chain line according to the vessel anchoring layout.

For this C Form, the roller assists chain guidance while the pawl provides the mechanical holding function. Selection should be based on the applicable chain diameter, chain grade, JIS F 2031 class requirement, chain lead, windlass and hawse-pipe arrangement, deck foundation, welding detail, operating side, and the approved vessel drawing. The R Form without chain guide uses a different dimensional arrangement and should not be mixed with the C Form data on this page.

Quick Specifications

• Product: roller pawl-type anchor chain stopper, C Form with chain guide → combines anchor-chain guidance with a pawl-type holding arrangement.

• Standard: JIS F 2031:1998, Annex 4 → standard designation: Roller pawl type chain cable stoppers.

• Applicable anchor chain: 70–132 mm → nominal No. 73 to 132 according to the supplied C Form table.

• Chain grade basis: JIS F 3303 Grade 2 / Grade 3 anchor chain → final chain grade and certificate requirement to be confirmed for the vessel.

• Connection basis: Kenter shackle arrangement → compatibility with the actual chain and connecting link should be checked during selection.

• Installation: welded into the ship anchoring arrangement → deck foundation, reinforcement, chain lead and operating clearance require drawing confirmation.

• Standard material basis: component-specific JIS materials → body side frame may be SCW410 cast steel or SS400 welded steel construction according to the standard arrangement.

• Reference calculated mass: 932–4,840 kg for the supplied C Form table → relevant to installation handling, foundation review, packing and freight planning.

Main Technical Parameters

Reference: JIS F 2031:1998 Annex 4, C Form with chain guide. Dimensions are in mm unless otherwise stated.

Selection & Inquiry Guide

• Step 1: Confirm JIS F 2031:1998 Annex 4 roller pawl type and confirm C Form with chain guide; if R Form without chain guide is required, request the corresponding drawing and dimensional table.

• Step 2: Confirm nominal No., actual anchor-chain diameter, JIS F 3303 chain grade, connecting-link / Kenter-shackle arrangement, and chain certificate requirement.

• Step 3: Confirm the required JIS F 2031 class, operating side, chain lead angle, windlass / cable-lifter position, hawse pipe or fairleader position, and available operating clearance.

• Step 4: Confirm deck foundation, reinforcement, welding arrangement, installation height, and any shipyard restrictions before production.

• Step 5: Confirm material traceability, coating system, inspection scope, NDT or load-test requirement, and classification-society requirement according to the project specification.

• Step 6: Provide quantity, vessel type, installation drawing, delivery destination, required delivery time, and reference photos or GA drawing if available.

Structure

C Form chain guide | Roller assembly | Pawl locking mechanism | Body side frames | Pawl shaft | Roller shaft | Bushes and washers | Welded deck foundation interface

Anchoring, Structure & Engineering Advantages

• The C Form combines a chain guide with the roller-pawl arrangement, helping maintain the intended anchor-chain path while the pawl provides the holding function.

• JIS F 2031 treats the chain stopper as a device independent of the windlass and attached to the ship structure; the foundation and surrounding deck reinforcement therefore form part of the overall load path.

• Roller geometry and chain alignment should avoid excessive local bending of chain links. Chain lead, roller position and the actual chain size should be checked against the vessel arrangement drawing.

• The holding device should remain positively secured in operation and should not loosen progressively toward the open position. Pawl engagement, pin retention and operating clearance are key inspection points.

• For an SS400 welded body-side-frame arrangement, the standard calls for equivalent strength to the cast-steel configuration and specifies additional material requirements around chain-guide and shaft-bearing areas.

• The increasing mass from No. 73 to No. 132 should be considered in workshop handling, shipyard lifting, deck access and foundation planning.

• Inspection, material traceability, NDT, load testing and class witnessing should be defined by the order scope and applicable class or project requirement rather than assumed as standard supply.

Custom Attributes

• Standard: JIS F 2031:1998, Annex 4 → Roller pawl type chain cable stoppers.

• Configuration: C Form with chain guide → supplied table corresponds to Annex 4 Figure 1 body arrangement; R Form without chain guide uses separate dimensions.

• Nominal No.: 73 / 78 / 84 / 90 / 95 / 102 / 107 / 114 / 122 / 132 → select according to chain diameter and vessel drawing.

• Applicable Chain: 70–132 mm, JIS F 3303 Grade 2 / Grade 3 basis → actual chain size and grade to be confirmed before quotation.

• Body Side Frame Material Basis: SCW410 or SS400 according to JIS F 2031 Annex 4 → welded SS400 construction must maintain strength equivalent to the cast-steel arrangement.

• Surface Treatment: Sa 2.5 blast cleaning + epoxy shop primer as a project reference → final coating system follows vessel / shipyard specification and is not a default JIS F 2031 requirement.

• Installation: welded deck foundation → chain lead, deck reinforcement, weld detail and operating clearance require approval by the vessel design / shipyard side.

• Certificate Requirement: available according to project requirement and order scope → material, maker and class documentation to be confirmed before order.

How It Works

Anchor chain is led through the C Form chain-guide and roller arrangement → Roller supports the intended chain path → Pawl is engaged to hold the chain → Chain force is transferred through the stopper body into the ship structure → Pawl is released according to the approved anchoring procedure when chain movement is required

Applications

Forecastle anchoring stations | Anchor windlass arrangements | Large-vessel anchor-chain systems | Grade 2 / Grade 3 anchor-chain routes | Newbuilding projects | Repair and replacement projects

Certifications & Advantages

Certificates and inspection documentation can be arranged according to project requirement, agreed order scope, material traceability and classification-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 2031 Annex 4 C Form and R Form?

A1: C Form is the roller pawl arrangement with a chain guide, while R Form is the arrangement without a chain guide. Their body, roller and pawl dimensions are specified separately and should not be mixed.

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

A2: Select the nominal No. according to the actual anchor-chain diameter, chain grade, vessel anchoring arrangement, required JIS class, chain lead, operating side, foundation and approved drawing. The 70–132 mm range on this page is for the supplied C Form table.

Q3: Does the JIS Class A / Class B design basis mean the stopper has a published SWL?

A3: No. JIS F 2031 defines class strength requirements relative to the nominal breaking load of the applicable chain. These class design bases should not be rewritten as a fixed product SWL. The chain grade, design basis, test requirement and class approval scope must be confirmed for the project.