Granite Tri-Squares
High-Accuracy References for X-Y-Z Axis Inspection & Machine Alignment
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SPT Metrology manufactures Granite Tri-Squares lapped for precise perpendicularity checking across CNC machine axes, spindle alignment, and squareness verification tasks. As a trusted Granite Tri-Square Manufacturer, we build these triangular reference tools for machine tool builders, CMM calibration, and metrology labs that need a stable, non-magnetic squareness reference that won't drift between checks.
Two-Face vs Three-Face: Built for the Task
Our two-face tri-squares carry a master angle with two narrow, perfectly perpendicular edges, well suited to checking component squareness, guideway alignment, and vertical structure inspection. For CNC machining centers and CMMs needing full geometric verification, our three-face tri-squares let you check X, Y, and Z axis perpendicularity from a single reference tool, rather than needing separate setups per axis.
Why the Triangular Form Matters
The rigid triangular geometry resists bending and deflection far better than a flat square of comparable size, which matters directly at the level of precision this tool operates at: a tri-square that flexes even slightly under its own handling introduces error before you've even taken a reading. Combined with granite's minimal thermal expansion and non-magnetic properties, the tri-square holds its perpendicularity through repeated daily use in real workshop conditions.
Where It Gets Used
SPT granite tri-squares support checking perpendicularity of machine guideways, aligning CNC X-Y-Z axes, verifying spindle and column squareness, inspecting tooling fixtures, and routine CMM calibration: the recurring checks that keep a machining center's geometric accuracy from silently drifting between major services.
Built to Metrology Standards
Every tri-square is lapped to tight tolerance and inspected before dispatch, manufactured in line with international metrology standards so the squareness reference you're relying on for machine calibration is itself fully traceable.
Why Manufacturers Choose SPT
As a Granite Tri-Square Supplier trusted across Tamil Nadu and beyond, we build every tri-square to hold its geometry through the exact conditions it's meant to work in, not just the controlled environment it was lapped in.
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Granite Tri-Square Manufacturers Across India.
From our facilities in Chennai and Dharmapuri, we manufacture and supply granite tri-squares to machine tool builders and metrology labs nationwide.