6-Inch Polished Stainless Steel Fixed Towing Chock for Inland Barges and Workboats

6-Inch Polished Stainless Steel Fixed Towing Chock for Inland Barges and Workboats

Product Overview

The 6-inch polished stainless steel fixed towing chock is a deck-mounted towline guide developed for river barges, tank barges, towboats, and workboats operating on American inland waterways and Gulf-connected service routes. Its fixed cast body provides a controlled rope path, while the curved polished working surfaces help reduce sharp contact, abrasion, and local line damage during towing, fleeting, and barge-handling operations.

This model is supplied as a 6-inch configuration with a stated Safe Working Load of 75 T. Selection must also consider towline construction and diameter, line MBL, expected lead angles, load direction, deck foundation, welding details, and the approved test basis. A 10-inch configuration is also available, but its dimensions and load rating are different and should be treated as a separate model.

Quick Specifications

• Product type: fixed stainless steel towing chock → guides the towing line through a defined deck-level path without moving rollers.

• Nominal size: 6 in → commercial size designation; confirm the actual opening and A-G dimensions against the approved drawing.

• Safe Working Load: 75 T → applies only to the confirmed load direction, installation foundation, and approved rating basis.

• Material: cast SUS304 stainless steel → exact casting grade, material standard, chemistry, and mechanical properties to be verified by MTC.

• Casting process: silica-sol casting technology → supports an integral cast form and controlled rope-contact geometry.

• Surface finish: high polished / mirror polished → smooth rope-working surfaces help reduce chafe and simplify visual inspection.

• Inspection options: radiographic examination and pull load test → scope, acceptance criteria, witness points, and reporting agreed before production.

• Series options: 6 in and 10 in → dimensions and SWL differ; the two versions are not interchangeable by size name alone.

Main Technical Parameters

Main product specification based on the information provided for the 6-inch model.

Main dimensions are in mm. Dimension letters must correspond to the approved product drawing.

Important: SWL is not the same as rope MBL, pull-test load, proof load, or breaking load. The stated 75 T rating should be released only with the approved load direction, foundation design, welding arrangement, and test documentation.

Selection & Inquiry Guide

Step 1: Confirm the required version: 6 in or 10 in, together with the reference drawing or existing chock model. Do not select only by the inch designation.

Step 2: Provide towline type, construction, diameter, MBL, expected service tension, and normal lead angles in plan and elevation.

Step 3: Confirm the required SWL unit, principal load direction, maximum side lead, deck location, foundation plate, surrounding reinforcement, and welding arrangement.

Step 4: Confirm the exact cast stainless steel grade and material standard, including whether the project requires SUS, ASTM/UNS, EN, or class-approved material identification.

Step 5: Define the surface finish, RT extent and acceptance level, pull-test or proof-load value, witness inspection, material traceability, and certificate scope.

Step 6: Provide vessel type, quantity, installation drawing or photos, classification society requirement, delivery destination, and required delivery time.

Structure

Integral cast stainless steel body | Fixed deck mounting base | Curved rope-working channel | Forward and aft guide shoulders | High-polished contact surfaces | Reinforced vessel foundation by shipyard

Towing, Casting and Installation Advantages

• The fixed channel controls the towline path and provides a smooth change of direction where the line passes across the deck edge or towing station.

• Rounded and polished working surfaces reduce sharp local contact and help limit abrasion, crushing, and heat build-up on synthetic or wire towing lines.

• The integral cast form reduces fabricated joints within the rope path; casting soundness and remaining wall thickness after grinding remain key acceptance points.

• RT and pull-load testing can be included in the inspection and test plan when required, with the examination zone and acceptance criteria agreed before production.

• The chock rating depends on the complete load path. Deck plate, foundation, reinforcement, weld size, weld length, and load direction must be verified by the vessel designer or shipyard.

• For brackish water, saltwater, chemical exposure, or tank-barge service, the final stainless grade and cleaning/passivation requirement should be reviewed against the operating environment.

Custom Attributes

• Nominal Size: 6 in → identifies this configuration but does not replace dimensional drawing verification.

• Safe Working Load: 75 T → project rating to be confirmed with unit basis, load direction, foundation, and approved test record.

• Material: Cast SUS304 stainless steel → exact casting grade and applicable standard must be shown on the material certificate.

• Rope Working Surface: High polished / mirror polished → smooth finishing is concentrated on the actual line-contact path.

• Inspection: RT and pull load test → inspection extent, test load, acceptance criteria, and witness requirement are order-specific.

• Installation: Fixed deck arrangement → welding and deck reinforcement are part of the vessel structure and require engineering confirmation.

• Related Model: 10 in fixed chock → uses different dimensions and SWL and should be quoted as a separate configuration.

How It Works

Towline approaches the chock → Line enters the polished fixed channel → Curved contact surfaces guide and restrain the line path → Towing force is transferred through the cast body and mounting base → Reinforced deck structure distributes the load into the vessel

Applications

American inland dry bulk barges | Tank barges | Towboats and push boats | Harbor and river workboats | Fleeting operations | Barge towing and handling stations | Newbuilding and replacement projects

Certifications & Advantages

Material certification, NDE records, pull-load test documentation, and class inspection can be arranged according to project requirement and are not included by default.

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

Drawing & Photos

FAQ

Q1: How should the 6-inch and 10-inch versions be selected?

A1: Select by the approved drawing, towline diameter and construction, line MBL, required SWL, load direction, available deck space, and foundation arrangement. The inch designation alone does not establish the rating.

Q2: Does the 75 T SWL apply in every towing direction?

A2: No. The rating must be linked to the approved principal load direction, allowable side lead, complete deck foundation, welding details, and test basis. A different lead angle or installation can change the structural demand.

Q3: What is normally required for ABS or other class inspection?

A3: The scope should be agreed before production and may include an approved drawing, material certificate, material traceability, NDE procedure and report, load-test procedure and results, welding or foundation details, and surveyor witnessing.

​Main Technical Parameters: 

Drawing of Stainless Steel Fixed Chock