What are the Different Sheet Pile Interlocks?

Interlocks are design features built-in to particular types of steel sheet piles that allow those sheet piles to join together for the ultimate purpose of creating walls and other barrier structures. There are three major sheet pile interlock options: Larssen, ball and socket, and thumb and finger. Each of these interlocks differs slightly in terms of function and capabilities. Below you’ll find more information about these three common types of interlocks.

Click to view sheet pile for sale

Larssen Interlock –

Featuring a “double-clutch” design that is simple and straightforward, Larssen interlocks have indented and outdented sections that interlock with each other to allow for the formation of wall and barrier structures such as retaining walls, oil terminals, and protection for coastal areas. Larssen interlocks were invented in Norway in the early 1900s and were one of the first types of hot-rolled sheet pile. They remain very popular today! The most common Larssen interlock styles of sheet pile include: AZ, NZ, ZZ, Hoesch, and ESZ.

Click for AZ NZ ZZ and Hoesch Sheet Pile for Sale

Ball and Socket Interlock –

As its name suggests, this type of interlock uses a “ball” and “socket,” which connect to adjoin sheet piles. Ball and socket interlocks allow sheet piles to form rigid walls or barriers that are resistant to pressure from forces like debris and water. In comparison to other types of interlocks, ball and socket interlocks are optimized for easy and efficient pile driving. Sheet pile with ball and socket interlocks is often used to create structures like retaining walls, cofferdams, bridge abutments, bulkheads, and more. Popular ball and socket styles of sheet pile include: PZ and PZC. The PZC style is wider and more lightweight than the PZ style. PZ and PZC sheets are some of our most popular sheet pile options at Eiffel Trading!

PZ/PZC Sheet Pile for Sale

Thumb and Finger Interlock –

This type of interlock is used on flat PS-style sheet piles. It enables flat sheets to create a circular or cellular barrier design appropriate for bulkheads, cellular cofferdams, graving docks, levees, and more. Thumb and finger interlocks allow sheet piles to be threaded together quickly and efficiently around a circular template. Popular types of sheet pile with thumb and finger interlocks include: PS 27.5 and PS 31. The number that accompanies the notation for these sheet pile types is indicative of their weight per square foot.

Flat Sheet Pile for Sale

Larssen, ball and socket, and thumb and finger interlocks are all engineered for repeated and sustained use. They are durable and dependable over the long haul. If you are a buyer looking for sheet pile with any of the major types of interlocks, you shouldn’t have any problem finding what you’re looking for on either the new or used market. Buying steel sheet pile used can save you a considerable amount of money, especially considering the current prices of steel.


And if you have some extra AZ, NZ, ZZ, Hoesch, ESZ, PZ, PZC, or PS sheets you’re not using anymore, selling can be a great choice. Steel sheet piles are made to be used and re-used and retain their value quite well, which means selling can be a smart and profitable move.

Click to View all Sheet Pile Listings

Buy and Sell with Eiffel Trading

Eiffel Trading’s online marketplace is a one-stop-shop for your steel piling needs; our inventory includes used steel sheet pile, brand new steel plates, used crane access trestle, used steel plates, and much more. Additionally, foundation equipment inventory ranges from used drill rigs, to used pile breakers, and everything in between.

All of our listings are constantly being updated, but if you don’t see what you’re looking for, create a wanted listing for free.

Ready to sell your used heavy equipment or construction material? List your products today for free on Eiffel Trading’s online marketplace.

If you have any questions or would like additional information, please call us at 1-800-541-7998 or email sales@eiffeltrading.com.