The Single Flush Foundation, also referred to as a Flush Single Twistlock Pocket, is a flush-mounted, weldable steel component designed to hold a single twistlock or stacking cone inside the cargo hold of a container ship. It ensures proper vertical alignment and load transfer for containers stacked below deck, while keeping the surface smooth and watertight.

Compact, durable, and fully ISO-compliant, this fitting is essential for standardized container lashing and securing systems on modern vessels.

Technical Specification of Single Flush Foundation AA-A1

• Model: AA-A1
• Safe Working Loads: Share 210KN, and Tension 250KN
• Breaking Loads: Shear 420KN, and Tension 500KN
• Total Wight: 7.3 KG
• Material: Weldable Carbon Steel
• Finish: Shop Primer
• Installation: Welded over a shallow deck recess
• Class Society Approved: ABS, DNV-GL, CCS and Others
• Application: Twist lock or stacking cone mounting in hold
• Category: Fixed Foundation Equipment in Hold
• Tags: Flush Foundation, Single Flush Mounting Base, Container Lashing

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

Drawings and Features of Single Flush Foundation

Key Features

Note: Always clean and remove debris from the pocket before inserting twistlock or cone.

• Flush Design – Seamless installation to avoid cargo interference or water ingress
• High Load Capacity – Withstands 500 kN tension and 420 kN shear loads
• Compatible with Twistlocks – Designed to hold manual, semi-auto, or mid-lock twistlocks
• Weld-Ready Construction – Manufactured from marine-grade carbon steel
• Watertight Safety – Typically fitted over recessed bases to maintain watertight integrity

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.

Our team minimizes delays by reducing back-and-forth on sample corrections, and our products consistently meet the quality standards of major classification societies (CCS, ABS, BV, LR) as well as ISO 3874 / ISO 1161. Whether for new builds or retrofits, we help streamline your project from inquiry to delivery — with speed, precision, and reliability.