Starrett 56243 Combination Square Set 300mm Metric

Product Description

The STARRETT 56243 is a 2-piece combination square set designed for precision layout, marking, and measurement work in fabrication, machining, and construction trades. The set includes a 300mm steel blade graduated in metric increments of 0.5mm and 1mm, paired with a cast iron square head for rigidity and accurate 90-degree reference. The heavy cast iron head resists wear and maintains square over repeated use. This tool is built for tradespeople who need reliable, repeatable measurements in metric applications on the shop floor or in the field.

The 56243 is suited for metalworking shops, pipefitters, millwrights, and general contractors working in metric dimensions. The 300mm blade length accommodates a wide range of layout tasks, from scribing reference lines on plate stock to checking squareness on fabricated assemblies. The dual graduation increments of 0.5mm and 1mm provide flexibility for both fine and coarse layout work. This set is a practical addition to any tool kit where metric precision measurement is a daily requirement.

Key Features

• 300mm steel blade with 0.5mm and 1mm metric graduations
• Cast iron square head for durability and stable 90-degree reference
• 2-piece set — blade and square head included
• Metric graduation style for use in metric-dimensioned work environments
• Steel blade material resists flex and maintains straight edge over time

Compatibility

Designed as a standard combination square set for metric layout and measurement tasks in metalworking, fabrication, and construction applications.

Installation Notes

Combination squares require no installation but should be inspected for squareness before use by referencing the head against a known flat surface. Keep the blade locking mechanism clean and free of debris to maintain accurate blade positioning. Avoid dropping the cast iron head, as impact can affect calibration. This tool is serviced and used by machinists, pipefitters, millwrights, and skilled tradespeople.