Marine Trawl Chain for Fishing Gear | G80 Short, Mid & Long Link Chain

Product Specification

Marine Trawl Chain for Fishing Gear | G80 Short, Mid & Long Link Chain

Product Overview

Marine trawl chain is a flash-butt-welded round-link steel chain supplied for fishing gear assemblies such as trawl ground gear, net weighting, tuna net sinker lines, bridles, and related connecting sections, subject to the actual fishing system design. The product range includes short-link, mid-link, and long-link configurations. Link geometry affects chain mass per metre, articulation, connector clearance, and the way the chain fits into a net or rigging arrangement, so selection should be based on the approved gear drawing rather than chain diameter alone.

The supplied range covers 7–28 mm chain diameter, 0.83–14.3 kg/m unit weight, and minimum breaking loads from 53 to 860 kN. G80, a minimum safety factor of 4, and the breaking-load values are manufacturer-supplied product designations. They do not automatically establish a certified lifting-chain working load limit, anchor-chain grade, or class-approved mooring capacity. The application load case, dynamic effects, wear allowance, connection details, material grade, finish, and test scope should be confirmed for each order.

Chain Configurations

• Short-link chain: compact link geometry and relatively higher mass per metre at comparable diameter → suitable where closer link spacing, compact movement, or concentrated net weighting is required.
• Mid-link chain: intermediate link length and unit weight → provides a practical balance between compactness, flexibility, and connection clearance.
• Long-link chain: more open link geometry and generally lower mass per metre at comparable diameter → useful where attachment clearance, larger articulation, or lower chain weight per metre is preferred.
• Final selection: link type, diameter, supplied length, end arrangement, and connectors must match the fishing gear drawing and the actual load path.

Quick Specifications

• Product category: Marine trawl / tuna / fishing chain → welded round-link chain for fishing net and trawl gear assemblies.
• Link configurations: Short, mid, and long link → enables selection by chain compactness, unit weight, movement, and connection clearance.
• Chain diameter range: 7–28 mm → covers light net-weighting arrangements through larger fishing gear connections within the supplied table.
• Minimum breaking load range: 53–860 kN → manufacturer-supplied tensile reference; it is not a declared lifting WLL.
• Unit weight range: 0.83–14.3 kg/m → important for net weighting, handling, total gear mass, packing, and freight calculations.
• Construction: Flash-butt-welded round links → weld quality, heat-treatment route, and dimensional consistency are key production controls.
• Material: Alloy steel or carbon steel stated by supplier → exact grade, chemistry, heat treatment, and mechanical properties must be confirmed.
• Finish and delivery: Self colour or specified finish; plywood box, wooden case, bag, or steel drum with pallet according to order.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm the actual function and installation position: trawl ground gear, chain dangler, net weighting, tuna net sinker line, bridle, connecting section, or another fishing gear application.

Step 2: Select short, mid, or long link together with nominal diameter, required chain mass per metre, movement requirement, connector clearance, and the approved net or rigging drawing.

Step 3: Confirm the design load basis: in-service tension, towing or retrieval loads, shock and dynamic effects, seabed contact, minimum breaking load requirement, design factor, and expected wear.

Step 4: Confirm material grade, heat-treatment requirement, flash-butt-weld quality controls, surface finish, corrosion protection, seawater exposure, and any operating-temperature requirement.

Step 5: Confirm total length or number of chain lengths, end links, joining links, shackles or fittings, marking, dimensional inspection, test reports, and class witnessing if required.

Step 6: Provide quantity or total metreage, fishing method, vessel type, destination, required delivery date, packing method, and reference drawing or existing-chain photos.

Structure

Round steel bar | Formed short / mid / long links | Flash-butt-welded link joint | Heat-treated strength grade where specified | Chain lengths or assemblies | End links and fittings to be confirmed | Self colour or specified surface finish

Fishing Gear Selection & Engineering Advantages

• Three link geometries allow the chain layout to be matched to net design, mass distribution, bending movement, and connection spacing instead of selecting only by bar diameter.
• The supplied weight-per-metre values support preliminary calculation of total chain mass for net weighting, handling, storage, packing, and vessel loading review.
• Minimum breaking-load values provide a clear tensile selection reference, while the page keeps breaking load separate from working load and avoids unsupported lifting claims.
• Flash-butt welding is suitable for continuous round-link production, but weld upset removal, weld consistency, link dimensions, and the heat-treatment process should be controlled and documented.
• Replacement chain should match the existing link geometry and connector interfaces. A chain with the same diameter but different link length may change weight, movement, and connection compatibility.
• Material traceability, dimensional inspection, breaking-load verification, and third-party witnessing can be arranged according to the agreed inspection and test plan.

Manufacturing, Inspection & Quality Control

• Raw material: Confirm steel grade, heat number, chemical composition, and material certificate before production, especially where G80 mechanical performance is required.
• Link forming and welding: Control bar diameter, forming geometry, flash-butt welding parameters, weld alignment, and removal of harmful weld projections.
• Heat treatment: Confirm the required process, batch traceability, hardness or mechanical-property checks, and records applicable to the selected material and strength grade.
• Dimensional inspection: Verify chain diameter, link length, inside width, outside width, unit weight, total supplied length, and compatibility with fittings or existing gear.
• Load testing: Define proof load, minimum breaking load, elongation, sampling frequency, test-piece selection, and witness requirements before quotation.
• Final inspection and packing: Check surface condition, identification, rust protection, chain length marking, package weight, and seaworthy packing according to delivery conditions.

Material & Surface Treatment

The supplied specification lists alloy steel and carbon steel. Because G80 performance depends on the actual material grade, welding procedure, heat treatment, and test results, the final steel designation should be confirmed rather than described only as generic carbon steel.

Standard supply may be self colour or another finish agreed with the customer. Painted, galvanized, or other corrosion-protection systems should be confirmed with the material and heat-treatment route. For high-strength alloy steel, coating preparation and hydrogen-embrittlement controls may require special attention. Stainless steel should be treated as a separate material option with its own mechanical-property and load table unless verified by test.

Custom Attributes

• Product Type: Marine trawl / fishing / tuna chain → select the description according to the actual fishing system.
• Link Type: Short / Mid / Long → changes link geometry, unit weight, movement, and connector clearance.
• Nominal Diameter: 7–28 mm → choose together with link type and minimum breaking-load requirement.
• Strength Designation: G80 stated by supplier → exact governing standard, material grade, and test basis to be confirmed.
• Safety Factor: Minimum 4 stated by supplier → not a declared lifting WLL and not sufficient without the application design basis.
• Surface Finish: Self colour or as requested → coating specification and corrosion protection should be included in the purchase order.
• Supply Form: Cut lengths, continuous length, drum, box, bag, or palletized package → total length and end arrangement to be confirmed.
• Documentation: Maker certificate, material certificate, dimensional report, and load-test documents → available according to agreed order scope.

How It Works

Fishing gear is deployed → Chain provides the specified mass, connection, or rigging function → Link geometry allows movement through the gear cycle → Tension and contact loads pass through the round links and welded joints → Gear is retrieved, cleaned, and inspected for wear, deformation, corrosion, and weld damage

Applications

Bottom trawl ground gear | Trawl net weighting and chain danglers | Tuna purse-seine sinker lines | Fishing net bridles | Net and gear connecting sections | Replacement chain for approved fishing assemblies | Marine fishing and selected aquaculture net systems subject to design confirmation

Certifications & Documentation

Maker test certificates, material certificates, dimensional inspection reports, breaking-load test reports, and third-party witness documents can be arranged according to the order scope. Classification society certification is subject to the society’s applicable rules, product scope, approved test plan, and inspection acceptance; it is not assumed as standard supply.

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

Packaging & Delivery

• Packing options: Plywood box, wooden case or bag,  bag, steel drum, and palletized export packing according to chain length, unit weight, and customer requirement.
• Package identification: Product name, link type, nominal size, supplied length, heat or batch reference, net weight, gross weight, and purchase-order number where required.
• Transport protection: Apply agreed temporary rust protection, drainage, wrapping, and seaworthy reinforcement suitable for storage and ocean transport.
• Delivery data: Confirm total metreage, number of packages, maximum package weight, lifting and handling restrictions, destination, and required delivery schedule.

Drawing & Photos

FAQ

Q1: What is the practical difference between short-, mid-, and long-link trawl chain?

A1: Short links provide compact geometry and generally higher weight per metre at comparable diameter. Mid links provide an intermediate arrangement. Long links provide more open geometry, larger connection clearance, and generally lower weight per metre at comparable diameter. The correct choice depends on the net drawing, required mass distribution, movement, connectors, and load case.

Q2: Can the supplied G80 trawl chain be used for lifting?

A2: Not on the basis of this table alone. The supplied G80 designation, safety factor, and minimum breaking loads are fishing-chain product data and do not automatically demonstrate compliance with lifting-chain standards. Lifting or overhead handling requires a separately specified and certified lifting chain with a declared WLL, proof test, marking, and documentation.

Q3: What information is required for an accurate quotation?

A3: Please provide fishing method and chain function, short/mid/long link type, nominal size, total length or quantity, required minimum breaking load, material and finish, end links or fittings, test and certificate scope, packing requirement, delivery destination, required delivery time, and an existing drawing or chain sample details if available.