Class 1 1000mm Cast Iron Bridge Ruler – Precision Inspection

Class 1 1000mm Cast Iron Bridge Ruler – Professional Inspection & Scribing Measurement Tool

Achieve exceptional dimensional accuracy with this Class 1 1000mm Cast Iron Bridge Ruler — the go-to precision measurement tool for workshop professionals, machinists, and quality control engineers. Built to exacting Class 1 tolerance standards, this heavy-duty cast iron bridge ruler is engineered for reliable flatness checking, surface plate inspection, scribing layouts, and platform maintenance tasks.

Its solid cast iron construction ensures long-term dimensional stability, resisting warping and wear even under demanding shop-floor conditions. The precisely ground reference surface provides a stable and accurate baseline for scribing, gauging, and straightedge alignment work — making it indispensable on measurement platforms, granite surface plates, and precision assembly benches.

Made in Mainland China.

Key Features

• Class 1 Accuracy: Ground and finished to Class 1 tolerance standards for professional-grade precision measurement
• 1000mm Span: Extra-long 1000mm (approx. 39.4") reach covers large workpieces and surface plates in a single pass
• Cast Iron Construction: High-rigidity grey cast iron body provides stability, vibration damping, and resistance to thermal distortion
• Bridge Design: Raised arch profile allows the ruler to bridge across surface plate edges and uneven workpiece surfaces
• Scribing & Inspection Ready: Precisely machined edges serve as a scribing guide and straightedge reference for layout work
• Platform Maintenance Use: Ideal for checking flatness and alignment of surface plates, machine tables, and inspection platforms
• Non-Electrified / No Hazardous Chemicals: Purely mechanical precision instrument — safe and straightforward to use

Specifications

• Length: 1000mm
• Accuracy Class: Class 1
• Material: Cast Iron
• Type: Bridge Ruler (Scribing & Inspection)
• Application: Flatness inspection, scribing layout, surface plate maintenance
• Electrified: No
• Hazardous Chemicals: None
• Country of Origin: Mainland China

Who Needs This?

This cast iron bridge ruler is the preferred choice for precision machinists, metrology technicians, tool & die makers, and quality assurance teams who demand traceable accuracy on the shop floor. Whether you're scribing layout lines on a large workpiece, checking the flatness of a machine table, or maintaining your inspection platform, this Class 1 instrument delivers the reliability you need.

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For more information on precision measurement standards and best practices in metrology, visit the NIST Metrology Program.

Frequently Asked Questions

Q: What does "Class 1" accuracy mean for a cast iron bridge ruler?

A: Class 1 is a precision tolerance classification for measurement tools. A Class 1 cast iron bridge ruler meets tighter flatness and straightness tolerances than Class 2 or lower-grade tools, making it suitable for high-accuracy inspection, scribing, and surface plate maintenance tasks in professional metrology and machining environments.

Q: What is a bridge ruler used for in a workshop or inspection environment?

A: A cast iron bridge ruler is used to check the flatness and straightness of surface plates, machine tables, and large workpiece surfaces. Its raised arch (bridge) profile allows it to span across a surface plate or workpiece, and its precision ground edge acts as a reference straightedge for scribing layout lines and performing dimensional inspections.

Q: Is this bridge ruler suitable for use on granite surface plates?

A: Yes. The Class 1 1000mm Cast Iron Bridge Ruler is fully compatible with granite and cast iron surface plates. It is commonly used alongside dial test indicators and slip gauges to verify surface flatness during platform maintenance and quality control inspections.

Q: How should I store and maintain my cast iron bridge ruler?

A: To preserve the accuracy and surface finish of your cast iron bridge ruler, store it in a dry environment away from moisture to prevent rust. Apply a light coat of protective oil to all machined surfaces after use, and handle it with clean hands or gloves to avoid corrosion from skin acids. Never stack heavy objects on top of the ruler, as this can cause distortion over time.