Norwegian Standard Welded Round Link Chain for Marine and Industrial Application

Product Specification

Norwegian Standard Welded Round Link Chain for Marine and Industrial Applications

Product Overview

The Norwegian Standard welded round link chain is supplied to the dimensional series commonly marketed as a Norwegian-pattern chain, with nominal bar diameters from 3.5 mm to 19 mm. The chain consists of interlocking round steel links formed and flash-butt welded into continuous lengths. It is intended for general marine utility, fishing, agricultural, forestry, suspension, connecting, barrier, and industrial service where the specified link geometry and load basis are suitable.

The supplied data provides link dimensions, unit weight, reference breaking load, and standard supply length. It does not identify an exact NS standard number, material grade, working load limit, proof load, heat-treatment condition, or lifting-chain certification. The reference breaking load must therefore not be treated as a WLL. Any overhead-lifting, chain-sling, hoist, or calibrated transmission application requires a separately confirmed standard, grade, proof-test regime, marking, and certificate scope.

Quick Specifications

• Product type: Flash-butt welded round link chain → flexible interlocking links for general connection, suspension, and utility service.
• Nominal bar diameter: 3.5–19 mm → covers lightweight utility chain through larger general-purpose sizes.
• Inside link length: 18–57 mm → affects articulation, attachment compatibility, and the number of links per metre.
• Inside link width: 5.5–27 mm → should be checked against hooks, shackles, pins, and other connecting components.
• Unit weight: 0.25–8.00 kg/m → supports handling, packaging, freight, and total assembly-mass calculations.
• Reference breaking load: 500–14,000 kgf from the supplied table → ultimate reference value only, not a declared WLL.
• Surface finish: Self-colour, electro-galvanized, hot-dip galvanized, or painted → select according to corrosion exposure and dimensional fit.
• Supply format: Standard cut lengths of 30–100 m depending on size → custom lengths, end links, and packaging should be confirmed before quotation.

Main Technical Parameters

Load Rating & Intended Use

• Breaking load is the reference force at which a test specimen is expected to fail; it is not the allowable operating load and must not be used directly as WLL.
• No working load limit, safety factor, proof load, chain grade, heat-treatment condition, or acceptance standard has been supplied for this series.
• The standard product should be treated as a general-purpose welded link chain unless the purchase specification defines a certified lifting, lashing, or load-bearing duty.
• For overhead lifting or chain-sling service, quote a separate lifting-chain specification stating the applicable standard, grade, WLL, proof test, breaking test, traceability, marking, and inspection certificate.
• For sprocket, pocket wheel, hoist, or transmission use, link pitch, dimensional tolerance, calibration, hardness, and wheel compatibility must be confirmed; the supplied dimensions alone do not establish transmission suitability.

Selection & Inquiry Guide

Step 1: Confirm the nominal bar diameter and required inside link length / width from the customer drawing, reference sample, mating hook, shackle, pin, or attachment.

Step 2: State the actual duty: general utility, fishing, agricultural, forestry, suspension, barrier, securing, transmission, lashing, or lifting. Load-rated duties require a separate technical specification.

Step 3: Confirm material grade, heat treatment, required WLL or proof load, minimum breaking force, dimensional tolerance, weld acceptance, and traceability when these are project requirements.

Step 4: Select self-colour, electro-galvanized, hot-dip galvanized, or painted finish according to the environment. Confirm whether coating thickness may affect fit through holes, hooks, or wheels.

Step 5: Provide total length, cut length per piece, quantity, end-link or fitting requirement, packaging method, and whether the chain is supplied loose, coiled, bundled, or packed in pails / cases.

Step 6: Confirm inspection and documentation scope, delivery destination, required delivery time, and provide a drawing, sample, or photo when exact Norwegian-pattern compatibility is required.

Construction

Round steel bar | Formed interlocking links | Flash-butt welded joint | Weld trimming and dressing | Optional heat treatment according to duty | Surface coating | Cut length, coil, bundle, or specified packaging

Manufacturing & Quality Control

• Incoming steel identification and bar-diameter control should be matched to the ordered material grade; the generic description “iron” is not sufficient for a load-rated chain.
• Link forming should control inside length, inside width, link alignment, and twist so that adjacent links articulate without local binding.
• Flash-butt welding should produce a complete joint around the link section. Weld upset, trimming, and local dressing should be controlled without reducing the required bar section.
• Dimensional inspection should cover bar diameter, pitch / inside length, inside width, overall cut length, and unit weight where specified.
• Visual inspection of welds and link surfaces should identify cracks, incomplete fusion, sharp fins, excessive mismatch, and coating defects that could affect service or handling.
• Proof testing, breaking testing, hardness testing, material verification, and third-party witnessing are arranged only when stated in the purchase specification.
• Hot-dip galvanizing or other coating should be selected with consideration for corrosion exposure, coating continuity, link articulation, and dimensional compatibility with mating fittings.

Custom Attributes

• Standard Basis: Norwegian dimensional pattern, exact NS number to be confirmed → the supplied table does not identify a traceable Norwegian standard designation.
• Chain Type: Welded round link chain → the supplied geometry is a conventional round-link pattern, not a confirmed cranked-link chain.
• Size Range: 3.5 / 5 / 6.5 / 8 / 10 / 11 / 13 / 16 / 19 mm → select by link geometry, service duty, and required load basis.
• Material: Carbon steel or alloy steel grade to be confirmed → material chemistry and heat treatment must match the required duty.
• Welding Process: Flash-butt welded → weld procedure, weld acceptance, and testing scope depend on the project specification.
• Surface Treatment: Self-colour / electro-galvanized / hot-dip galvanized / painted → select for corrosion environment and mating-component clearance.
• Load Data: Reference breaking load from supplied table → not a WLL and not sufficient to establish lifting suitability.
• Supply Length: 30–100 m per standard piece depending on size → custom cut lengths and packaging available subject to confirmation.
• Inspection: Maker inspection or third-party witnessing according to order → SGS or other inspection is not included unless specified.

Chain Geometry & Load Path

End connection applies tensile force → Adjacent links rotate and bear against each other → Force passes through the curved link sections and welded joint → Flexible articulation follows the connection path → End fitting transfers the force to the connected equipment

Applications

Marine utility connections | Fishing and aquaculture support | Agricultural and forestry equipment | Barriers and suspension | General industrial assemblies | Non-lifting securing and connecting | Custom chain assemblies subject to duty confirmation

Inspection & Certification

Inspection and documentation can be arranged according to the ordered duty, material traceability, test plan, and customer requirement. Possible documents include a maker’s inspection certificate, dimensional report, material certificate, coating report, proof-test or breaking-test report, and third-party witness report when specified.

Certification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA, CRS, Makers Test Certificate — available only when applicable to the confirmed product duty, inspection scope, and approval procedure; not supplied by default.

Drawing & Photos

FAQ

Q1: Is the breaking load in the table the same as the working load limit?

A1: No. The table provides a reference breaking load in kgf. A WLL requires a defined chain grade, safety factor, proof-test requirement, intended duty, and applicable standard. The breaking load must not be used directly as the operating load.

Q2: Can this Norwegian Standard chain be used for overhead lifting?

A2: Not on the basis of the supplied table alone. Overhead-lifting use requires a separately specified and certified lifting chain with confirmed material grade, heat treatment, WLL, proof load, minimum breaking force, marking, traceability, and compliance with an applicable lifting-chain standard.

Q3: What information is needed for an accurate quotation?

A3: Provide the nominal diameter, inside link length and width, intended duty, material or grade, finish, total and cut lengths, end fittings, quantity, required load / test basis, certificate scope, packaging, destination, and a drawing or sample when exact compatibility is required.