Engineers Squares

About Engineers Squares

Engineers squares are precision measuring and marking tools essential for checking perfect 90-degree angles in metalworking, engineering, and fabrication tasks. Also known as machinist squares or precision squares, these tools feature an L-shaped design with a stock and blade set at an exact right angle, manufactured from hardened stainless steel or precision-ground carbon steel. MyToolShed.co.uk stocks engineers squares in sizes ranging from compact 50mm models for detailed work to larger 300mm versions for substantial projects, with accuracy typically within 0.02mm per 100mm to meet demanding professional standards.

Available as individual squares or multi-piece sets, the range at MyToolShed features trusted brands including Draper, Facom, Faithfull, and Sealey. Whether you're verifying machine setups, checking component squareness, marking perpendicular lines, or conducting quality control inspections, these precision instruments ensure your measurements remain accurate and your work meets exacting engineering tolerances. Sets like the Faithfull 4 Piece Engineers Square Set and Sealey 4 Piece Precision Steel Square Set offer excellent versatility for varying applications.

Applications

Engineers squares are indispensable across numerous trades and industries:

• Mechanical Engineers – verifying component squareness, checking machine tool setups, and ensuring dimensional accuracy in manufactured parts
• Toolmakers and Die Makers – precision work requiring absolute accuracy when creating moulds, dies, and tooling components
• Machinists – setting up lathes, milling machines, and grinders, plus verifying workpiece orientation and alignment
• Fabricators and Welders – ensuring steel structures, frames, and assemblies are perfectly square before welding
• Maintenance Fitters – diagnosing machinery problems, checking equipment alignment, and conducting quality control inspections
• Precision Woodworkers – marking accurate cuts, checking joinery, and setting up machinery for fine furniture making
• Quality Control Inspectors – verifying manufactured components meet dimensional specifications and tolerances
• Apprentices and Students – learning fundamental measurement techniques in engineering and manufacturing education programmes

Choosing The Right Engineers Squares

Size and Application: Consider your typical workpiece dimensions. Smaller 50-100mm squares suit intricate work and tight spaces, whilst 150-300mm models are better for larger fabrication tasks. Multi-piece sets offer versatility across varying applications.

Accuracy Grade: Professional toolmakers require DIN 875 Grade 0 or 1 squares with tolerances of 0.01-0.02mm per 100mm. General engineering and fabrication work is well-served by Grade 2 squares, whilst workshop and DIY applications can use standard accuracy models.

Material and Construction: Hardened stainless steel offers excellent corrosion resistance, ideal for environments exposed to coolants and cutting fluids. Carbon steel squares require more care but often provide exceptional rigidity. Look for precision-ground edges and faces for optimal accuracy.

Base Design: Flanged bases, such as those on the Facom Flanged Stainless Steel Precision Square, provide superior stability when checking vertical surfaces. Standard bases are perfectly adequate for most general applications and drawing work.

Brand Quality: Established manufacturers like Facom, Draper, Sealey, and Faithfull available at MyToolShed.co.uk maintain strict quality control and offer reliable long-term accuracy for professional tradespeople.

Frequently Asked Questions

What's the difference between an engineers square and a try square?

Engineers squares are manufactured to much tighter tolerances (typically within 0.02mm per 100mm) using hardened steel construction, making them suitable for precision engineering and metalwork. Try squares are woodworking tools with lower accuracy standards and aren't appropriate for precision engineering applications requiring dimensional accuracy.

How do I check if my engineers square is still accurate?

Place the square against a known straight edge and scribe a line. Flip the square over and align it with the same line from the opposite direction. If the square's edge perfectly matches your original line from both orientations, it's accurate. Any visible gap indicates the square is out of true and should be replaced.

How should I maintain my engineers square?

After each use, wipe the square clean with a lint-free cloth to remove metal filings, coolant, and debris. Apply a light coating of corrosion-preventive oil if the square is carbon steel. Store in a protective case where it won't be dropped or knocked against other tools. Never use engineers squares as prying tools or hammers, as this will compromise their accuracy.