Editorial Technical Reference

Container Fitting

This page explains how Container Fitting is classified within Fabricated Metal Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A forged steel fitting used to secure and lift shipping containers, enabling stacking and transport on ships, trucks, and trains.

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Product Specifications

Technical details and manufacturing context for Container Fitting

Definition
Container fittings, also known as twist locks or container locks, are critical components in intermodal transport. They are used to lock containers to chassis, vessels, or each other during stacking. Specified by dimensions, load ratings, and material grade, they must meet international standards for safety and interchangeability. Grades vary by load capacity and corrosion resistance, with higher grades for offshore or heavy-duty applications. The fitting consists of a body with a rotating head that engages the container's corner casting. When turned 90 degrees, the head locks into the casting, securing the container. The locking mechanism is spring-loaded or manually operated, ensuring a positive engagement that withstands lifting and transport forces. Materials commonly specified include ASTM A148 Grade 80-50, ASTM A27 Grade 70-40, DIN 1.0558, and GB/T 11352 ZG270-500. Key parameters include rated load (25–40 t per ISO 1161), safe working load (20–30 t per ISO 3874), breaking load (≥150 t per ISO 1161), material yield strength (≥250 MPa per ASTM A148), hardness (150–220 HB), surface treatment (hot-dip galvanized or epoxy coated per ISO 1461), coating thickness (70–100 μm per ISO 1461), operating temperature (-40 to +80 °C), dimensional tolerance (±1.0 mm per ISO 1161), weight (3.5–5.5 kg), fatigue life (≥2,000,000 cycles), and corrosion resistance (≥500 h in salt spray per ISO 9227). Relevant standards include ISO 1161, ISO 3874, GB/T 1835, and JIS F 8010. Always verify model-specific values and standards with the legal manufacturer or supplier before procurement.
Working Principle
The fitting consists of a body with a rotating head that engages the container's corner casting. When turned 90 degrees, the head locks into the casting, securing the container. The locking mechanism is spring-loaded or manually operated, ensuring a positive engagement that withstands lifting and transport forces. The head is typically operated with a handle or tool, and the body is bolted or welded to the chassis or vessel. The design ensures that the container remains securely attached during lifting, stacking, and transit, while allowing quick release when needed. The fitting must be properly aligned with the corner casting to ensure correct engagement, and regular inspection is required to detect wear or damage that could compromise safety.
Common Materials
ASTM A148 Grade 80-50, ASTM A27 Grade 70-40, DIN 1.0558, GB/T 11352 ZG270-500
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Load25–40 tStatic load capacity per fittingISO 1161
Safe Working Load (SWL)20–30 tDynamic load capacity under normal operationISO 3874
Breaking Load≥150 tMinimum ultimate tensile loadISO 1161
Material Yield Strength≥250 MPaMinimum yield strength of cast steelASTM A148
Hardness150–220 HBBrinell hardness range for wear resistance
Surface TreatmentHot-dip galvanized or epoxy coatedCorrosion protection for marine environmentISO 1461
Coating Thickness70–100 μmZinc coating thickness for galvanized fittingsISO 1461
Operating Temperature-40 to +80 °CTemperature range for safe operation
Dimensional Tolerance±1.0 mmTolerance on critical dimensionsISO 1161
Weight3.5–5.5 kgTypical weight per fitting
Fatigue Life≥2,000,000 cyclesMinimum cycles under cyclic loading
Corrosion Resistance≥500 h in salt spray hMinimum salt spray test durationISO 9227

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Fitting Body
    Forged body bolted or welded to the chassis or vessel.
  • Rotating Head
    Turns 90 degrees to lock into the container corner casting.
  • Locking Mechanism
    Spring-loaded or manual mechanism that holds positive engagement.
  • Handle Optional
    Operates the head on manually released fittings.
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Manufacturing capability
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Inspection readiness
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Manufacturers of Container Fitting

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

CHISEN Forged Product
Zhangjiagang, Jiangsu, CN
Also makes: Steel Forging, Electric Power Fitting
Stated by the company · profile compiled by CNFX from public sources
View profile Send enquiry
Shanghai Metal Corporation
Shanghai, CN
Also makes: Power Distribution, Lighting System, Pressure Vessel and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Container Fittings”
View source page ↗ shanghaimetal.com · checked 2026-08-27
View profile Send enquiry

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Frequently Asked Questions

What are the typical load ratings for a container fitting?

According to ISO 1161, the rated load is typically 25–40 t per fitting, and the safe working load per ISO 3874 is 20–30 t. The breaking load is at least 150 t. These values are reference ranges; always verify the specific model's ratings with the manufacturer.

Which materials are commonly used for container fittings?

Common materials include ASTM A148 Grade 80-50, ASTM A27 Grade 70-40, DIN 1.0558, and GB/T 11352 ZG270-500. The minimum yield strength is typically ≥250 MPa per ASTM A148. Confirm the exact material grade for your application.

What surface treatments are available for corrosion protection?

Hot-dip galvanizing or epoxy coating are common, with zinc coating thickness of 70–100 μm per ISO 1461. Corrosion resistance is tested per ISO 9227 with a minimum of 500 hours in salt spray. Verify the treatment meets your environmental requirements.

What standards apply to container fittings?

Key standards include ISO 1161 for dimensions and load ratings, ISO 3874 for handling and securing, GB/T 1835 for Chinese applications, and JIS F 8010 for Japanese marine use. Always check compliance with the relevant standard for your region.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Container Fitting.

Container fittings container hardware

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 1 October 2026

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