The Quad Base Foundation AB-A4, also known as the Quad Doubling Plate Container Foundation, is a heavy-duty, flush-mounted weldable base used to anchor four twistlocks or D-rings for ISO container securing. Designed for installation at the bottom of cargo holds or on hatch covers, it provides maximum contact and load support for high-capacity lashing zones.

This foundation comes in multiple center-to-center spacing options — 203mm, 279mm (transversal layout), 216mm, 258mm, or customized — and is suitable for use with standard and midlock twistlocks or stacking cones. OLIPORTS ensures that all units meet strict quality and classification requirements, including ABS, DNV-GL, CCS approvals.

Technical Specification of Container Quad Base Foundation Plate.

• Model: AB-A4/203 、AB-A4/279、 AB-A4/216、AB-A4/258
• Center-to-Center: 203mm/279mm (ISO Standard), 216mm, 258mm or Custom
• Safe Working Loads: Share 210KN.
• Breaking Loads: Shear 420KN.
• Material: Weldable Carbon Steel
• Finish: Shop Primer
• Installation: Weld to the deck or hatch cover
• Class Approval: ABS, DNV-GL, CCS, Others
• Application: Under deck foundation for twist locks, D-rings, stacking cones
• Category: Fixed Foundation Equipment in Hold
• Tags: Base Foundation, Quad Base Plate, Doubling Plate, Container Lashing.

* Can be customized according to your needs, type and test class approved on request.

Drawings and Features of Quad Base Foundation

Features & Advantages

Note: Recommended for shipbuilders, retrofits, or new builds with high-density ISO container plans.

• Four-point anchoring for twistlocks or turnfoot D-rings
• Ideal for use in underdeck double-stack systems or heavy midship container positions
• Custom Spacing: Choose from 203mm, 279mm, or project-specific spacing
• High-performance foundation for cargo securing zones
• Fully certified by ABS, DNV, CCS, and other class societies
• Built for global fleet requirements with consistent dimensions and finish

Model	Lc (mm)	L(mm)	Weight (kg)
AB-A4/203	203	343	16.2
AB-A4/216	216	356	16.4
AB-A4/258	258	398	17.2
AB-A4/279	279	439	17.6

With over a decade of manufacturing and global distribution experience, OLIPORTS has developed deep expertise in container lashing and cargo securing systems. We fully understand the design drawings, structural layouts, and mechanical calculations behind every container ship’s securing solution — allowing us to respond quickly and accurately to your technical requirements.

• Deep understanding of ship drawings and classification standards
• Over 10 years of global lashing system supply experience
• Support for custom layouts to match your vessel and route
• Certified by CCS, ABS, DNV-GL, and compliant with ISO 3874 / ISO 1161
• Fast quote turnaround and fewer sample revisions
• Trusted by yards, shipowners, and retrofit contractors worldwide

Built to perform. Certified to last. Delivered on time. Our in-house design and fabrication capabilities ensure fast delivery, high compatibility, and long-term durability.