Cast Iron Surface Plates
Durable, High-Strength Bases for Precision Inspection & Tooling
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As a dedicated Cast Iron Surface Plate Manufacturer, SPT Metrology engineers every plate for accuracy, strength, and long service life on demanding shop floors. Built to Grade 1 tolerance under IS 2285:2003, each plate delivers a stable, repeatable reference surface for gauging, toolmaking, spotting, and general-purpose inspection, holding its accuracy even under sustained daily use. As a trusted Cast Iron Surface Plates Supplier across Tamil Nadu and beyond, we manufacture and dispatch to toolrooms, QC labs, and heavy engineering units throughout India.
Built From Premium-Grade Cast Iron
Every plate starts as IS 210:2009 Grade FG 260 cast iron, chosen for its strength, wear resistance, and dimensional stability. Before finishing, each casting undergoes a full stress-relieving process, eliminating internal stresses that would otherwise cause the plate to warp or lose flatness over time. The finished material sits in the 170–220 BHN hardness range, giving it strong resistance to surface damage from everyday tool contact and workshop handling, a key reason cast iron remains the standard choice for tool rooms and metrology labs across India.
Hand-Scraped for True Flatness
Our Precision Cast Iron Surface Plates are machined and then hand-scraped to bring the working surface to final tolerance, producing the fine, uniform contact pattern needed for blue matching, precision marking, and comparative inspection work. Cast iron's inherent rigidity also means the plate resists flexing under clamping loads and fixture pressure, an advantage in setups where granite's brittleness would be a liability.
Built for Inspection-Grade Reliability
For quality departments that can't afford drift, our Cast Iron Inspection Surface Plates are checked at every stage of manufacture, from casting through final scraping, so the flatness you're promised on paper is the flatness you get on the shop floor: this is especially critical in gauge calibration, CMM staging, and first-article inspection work, where even small deviations compound into rejected parts.
Sizes & Custom Configurations
Standard sizes are available off the shelf, and we also manufacture custom dimensions, T-slotted tops, threaded inserts, and other configurations to match specific fixture or workstation requirements, whether you need a compact bench plate or a large-format inspection base. As a Cast Iron Surface Plate India-wide supplier, we've shipped custom configurations to toolrooms across 10+ states.
Why Manufacturers Choose SPT
Every cast iron surface plate leaving our Chennai and Dharmapuri facilities is checked against traceable calibration standards before dispatch, so what you receive matches what's on the certificate. It's this attention at the finishing stage, not just the casting, that keeps SPT plates performing to spec well past the point where lower-grade plates start to drift.
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Cast Iron Surface Plate Manufacturers Across India.
From our facilities in Chennai and Dharmapuri, we manufacture and supply cast iron surface plates to toolrooms and inspection floors nationwide.