British Standard Medium Link Chain | 3.2–25.4 mm Welded Steel Chain

Product Specification

British Standard Medium Link Chain | 3.2–25.4 mm Welded Steel Chain

Product Overview

British Standard medium link chain is a welded round-steel chain with link proportions between the short-link and long-link patterns commonly offered for general engineering use. The supplied range covers nominal wire diameters from 3.20 to 25.40 mm, with black-finish and hot-dip-galvanized weight references. The medium link geometry provides more internal clearance than a short-link chain while remaining more compact than a long-link pattern.

This product should be treated as a general-purpose, non-calibrated welded link chain unless an exact standard, steel grade, manufacturing class, working load limit, and test certificate are confirmed in the purchase specification. It is not a cranked-link conveyor chain, lifting chain, chain sling, calibrated hoist chain, anchor chain, or certified mooring chain. The supplied test-load and breaking-load figures are reference mechanical data only and must not be presented as a working load limit.

Quick Specifications

• Product form: Welded round-steel medium link chain → general-purpose chain with intermediate pitch and practical internal link clearance.
• Nominal diameter range: 3.20–25.40 mm (1/8–1 in) → covers light utility sizes through larger general-engineering chain.
• Link dimensions supplied: diameter D, pitch L, and outside width W → key values for space, connector, and replacement checks.
• Reference test load: 200–12,150 kg as supplied → unit basis and test procedure must be confirmed before contractual use.
• Reference breaking load: 400–24,300 kg as supplied → not a WLL, SWL, MWL, or lifting capacity.
• Surface finish: B.F. and H.D.G. weight data → interpreted as black finish and hot-dip galvanized, subject to order confirmation.
• Supply length basis: net weight per 200 ft (60.96 m) → useful for coil, drum, freight, and inventory calculations.
• Intended use: general engineering, restraint, agricultural, barrier, and marine utility duties → lifting and personnel-support applications are excluded unless separately certified.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm the requested product as British-pattern medium link welded chain and provide any mandatory standard number, drawing, grade, or replacement sample.

Step 2: Select nominal diameter D and confirm pitch L, outside width W, required internal clearance, connector size, and total chain length.

Step 3: Describe the actual duty, static or dynamic loading, environmental exposure, and whether the chain is used for restraint, lashing, barrier, agricultural, marine utility, or another general-engineering purpose.

Step 4: Confirm steel grade, heat-treatment requirement, weld process, dimensional tolerance, surface finish, and whether the chain must be calibrated for a wheel or mechanism.

Step 5: Define the required documents: material certificate, dimensional report, batch test certificate, breaking test, coating report, third-party inspection, or purchaser witnessing.

Step 6: Provide quantity, length per coil / bundle / drum, packaging, marking, destination, delivery time, and photographs or drawings of mating fittings where available.

Chain Construction

Round steel link | Medium link pitch | Welded joint at each link | Flash trimmed weld zone when specified | Non-calibrated geometry unless confirmed | Black finish or specified zinc coating | Coil, bundle, drum, or cut-length supply

Manufacturing & Quality Control Considerations

• Wire or bar diameter, pitch, and link width should be controlled together because connector fit and chain mass depend on all three dimensions, not diameter alone.
• The welded joint is the critical manufacturing area. Weld penetration, flash removal, local profile, cracking, and heat-affected-zone condition should be included in production inspection.
• If proof or test loading is required, the load level, sampling frequency, test-machine calibration, permanent elongation criterion, and certificate wording should be agreed before production.
• Breaking tests are destructive sample tests. A listed breaking load does not establish a working load limit without a governing standard, grade, design factor, intended duty, and traceable test basis.
• Non-calibrated medium-link chain should not be assumed to run correctly over pocket wheels, chain wheels, gypsies, or hoist mechanisms; pitch and dimensional tolerances must match the equipment.
• Hot-dip galvanizing should be applied after welding and surface preparation. Coating build-up can increase mass and slightly reduce clear dimensions, which should be considered for close-fitting attachments.
• Cut ends and connecting components should be selected for the same intended duty and compatible dimensions. The weakest connector or joining method can govern the complete assembly.

Load Data & Use Limitations

• The supplied test-load values are exactly one-half of the listed breaking-load values, but they do not establish a WLL, SWL, MWL, or design factor without a confirmed standard, grade, duty, and test basis.
• Shock loading, side loading, twisting, knotting, wear, corrosion, bending over small radii, and incompatible connectors can reduce usable strength.
• This chain is not presented as lifting chain, chain sling, hoist load chain, fall-arrest chain, personnel-support chain, or overhead load-handling equipment.
• For lashing or load restraint, specify the allowable capacity, compatible end fittings, tensioning device, inspection criteria, and applicable project or transport rules.

Surface Finish Options

• Black Finish (B.F.): self-colour or black-finished chain for dry or protected general use → exact oil, blackening, or coating condition should be confirmed.
• Hot-Dip Galvanized (H.D.G.): zinc-coated chain for improved atmospheric corrosion resistance → coating standard, minimum coating requirement, appearance, and post-galvanizing inspection should be specified.
• Painted, electro-galvanized, or special plated finish: available only when agreed → define process, coating thickness, colour, environmental suitability, and packaging protection.

Custom Attributes

• Product Name: British Standard Medium Link Chain → common market name; exact governing standard to be confirmed.
• Chain Form: Welded round-link chain → not a cranked-link conveyor chain.
• Nominal Diameter: 3.20–25.40 mm → select together with pitch, width, duty, and connector geometry.
• Calibration: Non-calibrated unless otherwise specified → not automatically suitable for sprockets, pocket wheels, or hoists.
• Material: Steel grade to be confirmed → carbon steel is the common basis; alloy steel requires defined grade and mechanical properties.
• Finish: B.F. / H.D.G. as primary table options → alternative coatings require separate confirmation.
• Supply Length: Cut length, coil, bundle, or drum → state length tolerance and packaging requirement.

Applications

General engineering restraint | Agricultural and farm utility | Gates, barriers, and fencing | Industrial securing | Construction and workshop utility | Non-lifting marine utility | Confirmed dimensional replacement

Inspection & Documentation

Inspection and documentation can be arranged according to the confirmed standard, grade, batch, test scope, and coating requirement. Maker’s test certificate, material record, dimensional report, coating report, or third-party witness record should be specified before quotation; classification certification is not assumed.

Drawing & Photos

FAQ

Q1: Is this product a cranked-link chain?

A1: No. The supplied dimensions describe welded round links with diameter D, pitch L, and width W. Cranked-link mill or drag chains are conveyor chains with different articulated side-link geometry, attachments, and sprocket requirements.

Q2: Can the listed test load or breaking load be used as a lifting capacity?

A2: No. The table does not provide a WLL, SWL, lifting grade, design factor, acceptance standard, or compatible lifting components. A separately certified lifting chain complying with the applicable lifting-chain standard is required for lifting operations.

Q3: What information is required for an accurate quotation?

A3: Provide diameter, pitch, width, total quantity, length per package, intended duty, material grade, black or galvanized finish, test and certificate scope, packaging, destination, delivery time, and the exact standard or reference sample if interchangeability is required.