2 & 3 Roller Universal Fairlead for Ship Mooring | JIS F 2020-1979 Type A/B1/B2

2 & 3 Roller Universal Fairlead for Ship Mooring | JIS F 2020-1979 Type A/B1/B2

Product Overview

The JIS F 2020-1979 small-size steel plate deck end roller is a compact roller fairlead used for ship mooring, cargo-handling and boat-handling rope guidance. In international purchasing language, products of this form are also commonly described as 2-roller or 3-roller universal fairleads. The standard defines three arrangements: Type A uses two vertical rollers and one horizontal roller; Type B1 uses one vertical roller and one horizontal roller; Type B2 is the mirrored arrangement of Type B1.

The original JIS configuration uses rollers of approximately 76.3 mm diameter. Larger 101, 135 and 168 mm versions in the supplied product series should be treated as project-specific enlarged configurations rather than standard JIS F 2020 sizes. For replacement or newbuilding inquiries, the buyer should therefore confirm the required Type A/B1/B2 arrangement, rope route, installation geometry, approved drawing, material and project load basis before production.

Quick Specifications

• Product type: 2-roller / 3-roller deck end fairlead → compact rope-guiding arrangement for deck-edge and ship-side rope lead positions.

• Standard: JIS F 2020-1979 → official standard name is Steel Plate Deck End Rollers (Small Size).

• Type A: 3 rollers, 2 vertical + 1 horizontal → standard three-roller configuration.

• Type B1 / B2: 2 rollers, 1 vertical + 1 horizontal → Type B2 mirrors the B1 vertical-roller and claw arrangement.

• Standard roller diameter: approximately 76.3 mm → original JIS configuration; larger 101 / 135 / 168 mm versions require project drawing confirmation.

• Reference calculated mass: Type A 20.6 kg; Type B1 / B2 17.7 kg → standard reference values for the original configuration.

• Standard material basis: SS41 steel main structure, SGP or STPG38 roller tube, BC6 bronze or YBsC2 brass-casting bush → modern equivalents require project approval.

• Inspection basis: visual condition, dimensional compliance and smooth roller operation → key checks before shipment.

Main Technical Parameters

JIS F 2020-1979 standard configuration reference:

Project-specific enlarged size data supplied for this product series:

Selection & Inquiry Guide

Step 1: Confirm Type A, Type B1 or Type B2 from the vessel drawing. Type A is the 3-roller form; Type B1 and B2 are 2-roller mirrored arrangements.

Step 2: Confirm rope information, including rope type, rope diameter, normal lead direction and deck-edge route. Do not infer fairlead SWL from roller diameter.

Step 3: Confirm standard or enlarged configuration. The original JIS arrangement uses approximately 76.3 mm rollers; 101 / 135 / 168 mm enlarged versions require an approved project drawing.

Step 4: Confirm installation position, available space, foundation / weld arrangement, local deck reinforcement and access for roller inspection and lubrication.

Step 5: Confirm material grades or approved modern equivalents, surface-preparation and coating system, quantity, certificate / inspection requirement, destination and required delivery time.

Step 6: For replacement work, provide the existing fairlead photo and dimensional drawing so Type, handed arrangement and mounting interface can be checked before manufacture.

Structure

Steel Plate Body | Horizontal Roller | Vertical Roller(s) | Roller Shafts | Bronze / Brass Bushes | Shaft Retaining Plate | Grease Fitting | Deck-End Mounting Structure

Design / Engineering / Quality Advantages

• Type-specific rope guidance → Type A provides two vertical contact positions plus one horizontal roller; Type B1 / B2 provide a one-sided vertical roller with mirrored left / right arrangements.

• Rotating rope-contact surfaces → the rollers change the rope lead direction while reducing sliding contact against fixed steel deck edges.

• Maintainable pin-and-bush arrangement → the standard includes replaceable roller shafts, bushes and grease fittings, supporting inspection and lubrication in service.

• Material schedule is component-specific → body, rollers, shafts and bushes use different material groups rather than one generic material designation.

• Standard inspection focuses on service-relevant quality → finish should be free from harmful defects, dimensions should conform, and the rollers should operate smoothly.

• Replacement engineering should verify handedness and interface → Type B1 and B2 are mirror arrangements, so the existing vessel layout should be checked before fabrication.

Custom Attributes

• Standard: JIS F 2020-1979 → reference standard for small-size steel plate deck end rollers.

• Type: A / B1 / B2 → Type A is 3-roller; Type B1 / B2 are 2-roller mirrored arrangements.

• Standard Roller Diameter: Approx. 76.3 mm → original JIS configuration.

• Project-Specific Enlarged Sizes: 101 / 135 / 168 mm → not standard JIS sizes; approved drawing required.

• Standard Material Basis: SS41 / SGP or STPG38 / BC6 or YBsC2 → legacy JIS grades and component-specific material schedule.

• Bush & Lubrication: Bronze or brass-casting bush with grease fitting → supports roller rotation and maintenance.

• SWL / Design Load: To be confirmed → no product SWL should be derived from the supplied roller-diameter table.

• Surface Protection: According to project specification → blasting, marine coating, stainless-steel finish or other systems are project-specific supply options.

• Certificate Requirement: According to order scope → maker documentation or class involvement is subject to project requirement and approval procedure.

How It Works

Rope Approaches the Deck-End Fairlead → Rope Contacts the Required Horizontal / Vertical Roller → Roller Rotates to Reduce Sliding Contact → Rope Lead Direction Changes → Resulting Forces Transfer Through the Fairlead Body to the Supporting Ship Structure

Applications

Ship Mooring Rope Guidance | Workboats | Tugboats | Harbor Service Vessels | Deck-Edge Rope Lead Positions | Cargo-Handling Rope Guidance | Boat-Handling Arrangements | Replacement Projects

Certifications & Advantages

Inspection and certification scope should be confirmed before quotation. Material certificates, maker inspection records, dimensional checks, roller-operation inspection and classification-society attendance can be arranged according to project requirement and order scope.

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

Drawing & Photos

FAQ

Q1: What is the difference between JIS F 2020 Type A, Type B1 and Type B2?

A1: Type A is the three-roller arrangement with two vertical rollers and one horizontal roller. Type B1 uses one vertical and one horizontal roller, while Type B2 mirrors the B1 vertical-roller and claw arrangement. The correct type should be taken from the vessel layout or replacement drawing.

Q2: Are 101, 135 and 168 mm standard JIS F 2020 sizes?

A2: No. The original JIS F 2020-1979 configuration uses rollers of approximately 76.3 mm diameter. The 101, 135 and 168 mm versions in this product series are project-specific enlarged configurations and should be manufactured only against an approved drawing.

Q3: What should be confirmed before ordering a replacement or enlarged fairlead?

A3: Confirm Type A/B1/B2, roller arrangement, rope route and diameter, actual mounting dimensions, installation side, material, coating, project load basis, certificate requirement and the existing vessel drawing or photo. For Type B replacement, confirm whether B1 or the mirrored B2 arrangement is required.