50 McGrath Road P.O. Box 670 Dracut, MA 01826Toll Free 1 (800) 343-0001Fax 1 (978) 452-9988

Distributor of Building Materials since 1847

Adjustable Column With Interchangeable Cap Plates

Adjustable Columns

Designed with an embedded fastening unit in the top of the Lally Lock Adjustable Columns, these columns offer the ability to use different cap plates. The adjustable columns come in 3” or 4” diameter, constructed using 11-gauge steel. A 4 5/8” x 5 3/8” x 3/8” Standard Cap Plate comes with each column; however, it can be switched in the field for an interchangeable Lally Lock Beam or Saddle Plate. This allows an adjustable column to be used for an LVL or heavy weight load applications easily instead of waiting for a costly custom plate design.

These adjustable columns have an easy adjustable base that allows an adjustment up to 4”. A 2 and 1 adjustment tool is included with the column. This tool has one end that is a wrench used for the base adjustment. The other end is an allen wrench for changing out the top plate.

Available Plates

Included Standard Cap Plate

This plate is 4 5/8” x 5 3/8” x 3/16” made in 10-gauge steel. With a center sink hole, the plate screws into the column. The plate has either one keyhole or one 3/8” hole located in each corner to attach the plate to the beam.

Interchangeable Lally Lock Beam Plate

Made from 1/4” low carbon steel. The plate has two keyholes and two 3/8” holes with a 19/32” counter sunk hole in the center of the plate to accept a 1/2” bolt. The plate can be used for a 3 1/2” or 4” column.

Interchangeable Lally Lock Saddle Plate

Made from 12 gauge low carbon steel with eight 3/16” holes. A specially designed hole and bolt to connect the plate to the column is located in the center of the plate.

Size and Load Chart

Adjustable Columns Chart

Structural Lock System Components

Lock System

Originally, our patented Lock System was designed for our concrete filled and hollow adjustable lally columns.

More Info

Lock Column

Our patented Lally Lock columns are concrete-filled and are available in 3 1/2″ or 4″ outside diameter.

More Info


Our system allows users to simply screw in any of our cap plates into a 6″ threaded rod.

More Info


Our base plates are designed to disperse a wide range of load configurations.

More Info


Our columns come 3″ & 4″ in diameter and are constructed using 11 gauge steel.

More Info


Use our bracing when building a deck in high wind areas, reinforcing an existing deck, or looking to distribute weight.

More Info