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

Product Specification

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

Product Overview

The 10-inch polished stainless steel fixed towing chock is a cast deck fitting used to guide towing wire, synthetic towing line, or barge rigging through a defined lead point. It is intended primarily for American inland bulk barges, tank barges, workboats, towboats, and related harbor or fleet operations where a fixed, smooth rope-contact path is required.

The one-piece stainless steel casting uses a curved throat and rounded section transitions to reduce sharp local contact at the line path. Mirror or high-polished finishing improves surface smoothness and simplifies routine cleaning, while final selection must be verified against the towing arrangement, line diameter, load direction, lead angle, supporting deck or bulwark structure, inspection scope, and approved vessel drawing.

Quick Specifications

• Nominal type: 10-inch fixed towing chock → compact fixed line guide for inland barge and workboat towing arrangements.
• Rated SWL: 65 t as provided → load direction, allowable lead angle, design factor, and approved basis must be confirmed before order.
• Main dimensions: A 534 × B 435 × C 370 mm → key envelope dimensions for deck or bulwark arrangement review.
• Casting material: stainless steel specified as SUS304 or SUS316 → exact cast grade, chemistry, heat treatment, and MTC basis to be confirmed.
• Manufacturing process: silica-sol investment casting → supports controlled geometry and a smoother as-cast surface before final polishing.
• Surface finish: high polish, mirror polish, or light polish → select according to rope-contact requirement, appearance, and maintenance preference.
• Inspection options: radiographic examination and pull-load test → scope, test load, acceptance criteria, and witnessing must be agreed in the inspection plan.
• Unit weight: approximately 90 kg → useful for handling, foundation planning, packing, and freight estimation.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm the application vessel and towing arrangement: inland bulk barge, tank barge, workboat, towboat, pushboat, harbor tow, or fleet service.

Step 2: Confirm line type and diameter, expected maximum line load, load direction, horizontal and vertical lead angles, and whether the stated 65 t SWL applies to a defined design direction.

Step 3: Provide the installation position and supporting structure drawing, including deck or bulwark thickness, reinforcement, weld preparation, and available mounting space.

Step 4: Confirm the required cast stainless grade, including the governing ASTM, JIS, EN, or project material designation, heat treatment condition, and material traceability.

Step 5: Confirm the polishing level and inspection plan: visual and dimensional inspection, RT extent, pull-load or proof-load requirement, test fixture, acceptance criteria, and witness requirement.

Step 6: Provide quantity, required certificate scope, class society or owner requirement, delivery destination, required delivery time, and product or installation photos if available.

Structure

One-piece stainless steel casting | Fixed deck or bulwark mounting body | Curved towing-line throat | Rounded section transitions | Polished rope-contact surface | Load-transfer area to supporting vessel structure

Casting, Towing and Installation Advantages

• The curved rope-contact path helps guide towing wire or rope through the selected lead while reducing sharp edges and abrupt local bending at the chock.
• Rounded changes in section support a smoother structural load path through the casting; the final design direction and permissible side lead must still be verified by calculation or approved drawing.
• Silica-sol casting can support tighter surface and dimensional control than rough sand-cast finishing, but casting soundness must be demonstrated by the agreed inspection scope rather than described as defect-free.
• A polished stainless steel contact surface reduces coating damage at the line path and can simplify cleaning; it does not remove the need for inspection for wear, deformation, corrosion, or rope damage.
• SUS316-type material is generally considered when greater chloride resistance is required, while the actual cast grade and service environment must be stated in the purchase specification.
• The chock and its deck or bulwark foundation act as one load-transfer system. Foundation design, reinforcement, weld details, and installation inspection are therefore as important as the casting itself.
• RT and pull-load testing can be arranged according to project requirement, but examination zones, test load, holding time, acceptance criteria, and witness points must be confirmed before production.

Custom Attributes

• Product Type: Fixed towing chock → a non-lifting deck fitting used to guide towing or rigging lines.
• Primary Market: American inland waterway vessels → intended for bulk barges, tank barges, workboats, towboats, and fleet operations.
• Nominal Size: 10 inch → confirm whether this refers to the line opening, product series, or customer drawing designation.
• Rated Load: 65 t SWL as supplied → confirm design direction, lead angle, safety factor, test load, and approval basis.
• Material: SUS304 / SUS316 cast stainless steel → exact casting standard and grade to be stated on the PO and material certificate.
• Casting Process: Silica-sol investment casting → selected for controlled geometry and improved surface quality before polishing.
• Surface Treatment: High polish / mirror polish / light polish → define required finish on all surfaces or rope-contact surfaces only.
• Quality Control: RT and pull-load test available → subject to agreed procedure, acceptance standard, and witness scope.
• Certificate Scope: Maker's inspection report, material certificate, and class-related documentation → available according to order and approval procedure.

How It Works

Towing wire or rope approaches the chock → The curved polished throat controls the line lead → Contact load is distributed through the cast body → The fixed mounting and reinforced vessel structure transfer the load into the deck or bulwark

Applications

American inland bulk barges | Tank barges and oil barges | Workboats | Towboats and pushboats where approved by drawing | Harbor and fleet towing arrangements | Newbuilding and replacement projects

Certifications & Advantages

ABS-related approval or survey attendance can be arranged only according to the project specification, approved drawing, inspection scope, and class procedure. Manufacturer's inspection records and material certificates are available according to the purchase order.

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

Drawing & Photos

FAQ

Q1: Can the 65 t SWL be used for every towing direction?

A1: No. The supplied SWL must be tied to a defined load direction and allowable lead-angle range. The vessel designer or class-approved drawing should confirm the chock, foundation, reinforcement, and weld arrangement for the actual towing geometry.

Q2: Should SUS304 or SUS316 be selected for inland barge service?

A2: Selection depends on water chemistry, chloride exposure, cleaning practice, cargo environment, and the project material specification. SUS316-type chemistry is generally considered where improved chloride resistance is required, but the exact cast grade and certificate designation must be confirmed.

Q3: Are RT, pull-load testing, and ABS certification included by default?

A3: No. RT coverage, acceptance criteria, proof or pull-test load, holding time, witness attendance, and ABS documentation must be defined before quotation. Class approval is subject to the vessel project and approval procedure.