Technical Specification of Container Quad Flush Foundation Base.

• Model: AA-A4/203 、AA-A4/279、 AA-A4/216、AA-A4/258
• Center-to-Center: 203mm/279mm (ISO Standard), 216mm, 258mm or Custom
• Safe Working Loads: Share 210KN, and Tension 250KN.
• Breaking Loads: Shear 420KN, and Tension 500KN.
• Material: Weldable Carbon Steel
• Finish: Shop Primer
• Installation: Weld to the deck or hatch cover
• Class Approval: ABS, DNV-GL, CCS, Others
• Application: Twistlocks + Turnfoot D-ring combination to lash or hold cargo
• Category: Fixed Foundation Equipment in Hold
• Tags: Flush Foundation, Quad Flush Mounting Base, Container Lashing.

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

Product Overview

The Quad Flush Foundation, also known as the Quadruple Flush Twistlock Pocket, is a flush-mounted weldable base fitting designed to secure four twistlocks simultaneously within the cargo hold or on hatch covers. Manufactured from high-strength carbon steel and fully class-approved (ABS, DNV-GL, CCS), this fitting is ideal for multi-container base locking, or when container lashing requires tight grouping, reinforcement, or combination with turnfoot D-rings. With customizable center-to-center dimensions and a rated breaking load of 500KN, it’s an optimal choice for ships requiring precision and strength in underdeck lashing.

This versatile unit accommodates ISO standard spacing (203mm or 279mm center-to-center) and offers custom configurations to suit vessel-specific layouts. Fully class-approved and ISO-compliant, this foundation base delivers strength, stability, and watertight integrity for secure cargo operations. Compact, durable, and fully ISO-compliant, this fitting is essential for standardized container lashing and securing systems on modern vessels.

Drawings and Features of Quad Flush Foundation

Key Features

Note: Need alternate hole spacing? Custom configurations available upon request.

• Four-Point Lashing Capability: Accommodates 4 twistlocks or lashing combinations
• Versatile Design: Supports turnfoot D-rings, twistlocks, and rods
• Custom Spacing: Choose from 203mm, 279mm, or project-specific spacing
• Heavy-Duty Performance: 500KN max tension load capacity
• Weldable & Class Approved: Meets ABS, DNV-GL, CCS, and ISO standards
• Flush-Mount: Seamless deck integration, reduces obstruction and improves water resistance

Model	Lc (mm)	L(mm)	Weight (kg)
AA-A4/203	203	383	45
AA-A4/216	216	396	46.3
AA-A4/258	258	438	50.5

Chamfer Type

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.