Precision Granite Angle Square

UNPARALLELED LTD is one of the leading manufacturers and suppliers of precision granite angle square in China. With abundant experience, we warmly welcome you to buy advanced precision granite angle square made in China here from our factory. We also accept custom orders.

Precision You Can Trust, Cast in Stone

Ask any metrologist what keeps a measurement honest over twenty years, and the answer rarely involves steel. Metal squares creep, rust, and drift with every swing in shop temperature - and in ultra-precision work, drift is the enemy. That's exactly the problem UNPARALLELED® set out to solve with our precision granite angle square (granite try square), a reference-grade tool machined from premium black granite with a density of roughly 3,100 kg/m³ - noticeably denser and more dimensionally stable than the marble substitutes some budget suppliers quietly swap in.

If you've ever searched for "granite square for CMM calibration," "how to check squareness of a machine base," or "best material for a stable measuring reference," this page - and this product - is built for exactly that need.

Exact tolerance grade, dimensions, and certification are configured to your application - see FAQ below.

• Dimensionally stable under real shop conditions - negligible thermal drift keeps your squareness reading valid from first measurement to last, even across a full production shift.
• Non-magnetic, non-conductive - safe to use around magnetic chucks, CNC spindles, and sensitive electronic gauging without interference.
• Corrosion-proof by nature - no oiling, no rust prevention routine, no degradation from coolant or humidity in the shop.
• Verified high-density material - sourced and controlled to roughly 3,100 kg/m³, well above the marble-blend stone some lower-cost suppliers pass off as granite.
• Full metrological traceability - every square ships with calibration documentation traceable to a national metrology institute, so it holds up in an ISO 9001 audit, not just on your bench.
• Engineered lightening bore - reduces mass and thermal lag without sacrificing the rigidity of the working edges, so the tool equalizes to ambient temperature faster than a solid block.
• Custom-built to your drawing - sizes, tolerance grades, and edge configurations are manufactured to spec rather than forced into a catalog size.

Picture a CMM technician starting the morning shift: before trusting a single reported dimension, they set the granite square against the machine's reference column and confirm the axis is still true. No warm-up curve to wait out, no correction factor to apply for the room being a few degrees warmer than yesterday - the reading is the reading.

The same tool travels well beyond the metrology lab. On the assembly line, it's used to verify that a linear guide rail sits truly perpendicular to its mounting base before the carriage ever gets bolted down. In semiconductor and PCB drilling equipment, where positioning error is measured in microns rather than millimeters, technicians rely on it to validate table squareness during machine build and periodic requalification. Optical inspection (AOI) and industrial CT equipment manufacturers use it for the same reason: once a reference is granite, nobody has to ask whether last week's number still holds.

Is your granite actually granite, or a marble composite? Genuine black granite, verified at a density of approximately 3,100 kg/m³. We deliberately call out this figure because some suppliers substitute cheaper marble - which is softer, less stable, and denser-looking but not denser-performing - and market it as granite. We don't do that, and we're happy to provide material test reports on request.

What squareness tolerance can you manufacture to? Depending on size and grade requested, tolerances down to roughly 1 μm are achievable. Tell us your application (CMM reference, machine assembly, general inspection) and we'll recommend the appropriate grade.

Can you certify the square to my national standard? Yes. Our metrology team works to DIN, GB, JIS, BS, ASME, and ГОСТ standards, and every unit is calibrated against equipment traceable to national metrology institutes, with documentation supplied.

Can sizes and hole placement be customized? Yes - the square shown is our standard configuration, but length, thickness, hypotenuse angle, and bore diameter/position can all be produced to your drawing or sample.

How do I know this will actually improve my measurement accuracy vs. what I'm using now? Send us your current tolerance requirement and application (CMM, machine assembly, inspection fixture, etc.), and our team will recommend the correct grade and configuration - including, where useful, a side-by-side comparison against a steel or lower-grade stone square.

Ready to Get an Accurate Reference That Doesn't Move?

If squareness drift has ever cost you a rework, a failed audit, or an uncomfortable conversation with a customer, it's worth putting a real granite reference on your bench.

Request a custom quote: tell us your required size, tolerance grade, and applicable standard (DIN / GB / JIS / BS / ASME / ГОСТ), and our engineering team will respond with a tailored specification and lead time.

📩 Get a Quote / Technical Consultation - contact UNPARALLELED® directly, or visit www.unparalleled-group.com to speak with our precision measurement specialists.

UNPARALLELED® - Dare to be first, courage to innovate. No cheating, no concealment, no misleading.

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