Folding Squares

About Folding Squares

Folding squares are compact precision measuring tools designed to provide accurate 90-degree angles whilst folding flat for convenient storage and transport. Essential for carpenters, joiners, roofers, and metalworkers, these versatile layout tools feature hinged arms that lock securely when open for marking and checking squareness, then fold away to fit comfortably in a tool belt or pocket. MyToolShed.co.uk stocks quality folding squares from trusted brands including Stanley, Hultafors, Faithfull, and Draper, all engineered to deliver reliable accuracy on UK building sites and workshops.

Typically constructed from lightweight anodised aluminium with clearly etched metric graduations, modern folding squares combine durability with portability. Blade lengths commonly range from 200mm to 300mm, with secure locking mechanisms that hold the square rigid during use whilst allowing smooth folding action when needed. Whether checking door frames for square, marking timber cuts, or setting out roof structures, a well-made folding square delivers the precision required for professional joinery and construction work.

Applications

Folding squares serve numerous trades and applications across the UK:

• Carpenters and Joiners: Checking door frames, marking accurate timber cuts, setting out stairs, and verifying corner squareness in woodworking projects
• Roofers: Calculating and marking rafter angles, checking roof structures, and ensuring accurate cuts on fascia boards
• Kitchen Installers and Shopfitters: Ensuring cabinets, worktops, and display units are installed square and true
• Builders and General Contractors: Checking wall corners, setting out foundations, and verifying structural squareness throughout construction
• Metalworkers and Fabricators: Marking cutting lines on sheet metal and verifying right angles in fabrication work
• DIY Enthusiasts: Home improvement projects including decking, shed building, shelving, and furniture assembly requiring accurate 90-degree angles

Choosing The Right Folding Squares

Blade Length: Most folding squares feature 200mm to 300mm blades. A 300mm blade offers greater reach for larger frames and longer boards, whilst 200mm models provide better portability for tight spaces and second-fix work.

Construction Quality: Look for anodised aluminium construction that resists corrosion in UK site conditions. MyToolShed.co.uk stocks models from Hultafors, Stanley, Faithfull, and Draper with solid rivets and hinges at the most vulnerable points. Professional-grade squares typically guarantee accuracy within 0.5mm over the blade length.

Locking Mechanism: A secure, easy-to-operate lock is essential. Wing nut systems offer positive locking, whilst friction hinges maintain consistent pressure. The mechanism should hold firmly without play yet open and close smoothly.

Scale Graduations: Choose squares with clearly marked metric graduations that are etched or laser-engraved rather than printed. This ensures markings remain legible even after years of heavy site use, typically with 1mm increments for precise measuring.

Frequently Asked Questions

What's the difference between a folding square and a try square?

A try square has a fixed 90-degree angle and doesn't fold, offering slightly better rigidity but less portability. Folding squares sacrifice minimal rigidity for the convenience of folding flat, making them ideal for site work where tool belt space is limited. Quality folding squares from Stanley or Hultafors provide more than adequate accuracy for most carpentry and construction applications.

How do I verify my folding square is still accurate?

Place your square against a straight edge and draw a line. Flip the square over and align it with the same line—if accurate, the blade will align perfectly. Any deviation indicates lost accuracy and the square should be replaced. Perform this test periodically, especially after drops or impacts.

What blade length suits general carpentry work?

For most carpentry and joinery applications, a 300mm blade provides excellent versatility, offering sufficient reach for checking door frames and marking boards without being unwieldy. Smaller 200mm models suit tight spaces but may feel limiting for first-fix carpentry or roofing work.