Engineers Square 100mm 4in Machinist Square

An engineers square in a compact 100mm / 4in size, used for checking and marking true 90° angles on metal and other workshop materials. A handy measuring and marking tool for machinists, fabricators and anyone who needs a quick visual check when setting out work.

Used for metalworking, fabrication, workshop layout and general bench work, this 4in machinist square helps when checking edges, marking lines and confirming that components sit square before cutting, drilling or fitting. It suits trade use, garage jobs and careful DIY repairs where accurate right-angle marking matters, especially on smaller parts that need close, controlled handling.

The 100mm / 4in format makes it easy to keep on the bench, in a toolbox or alongside other measuring tools for regular use. Its compact size is useful when working in tighter spaces or when checking smaller sections without a larger square getting in the way. For repeated workshop use, having a dedicated 90° square close to hand can save time on marking out and help keep measuring jobs straightforward. With no unnecessary bulk, it is easy to pick up for quick checks during fitting, fabrication or general maintenance work.

Engineers square specifications

• Size: 100mm / 4in square for compact measuring and marking work.
• Function: Used to check and mark true 90° angles on workshop jobs.
• Application: Suitable for machinist, fabrication, metalworking and bench use.
• Handling: Smaller format is easier to use on tighter areas and smaller components.
• Use: Handy for layout, checking edges and marking before cutting or drilling.

A practical choice for regular workshop marking and square-checking jobs.