{"product_id":"class-1-1000mm-cast-iron-bridge-ruler-precision-inspection","title":"Class 1 1000mm Cast Iron Bridge Ruler – Precision Inspection","description":"\u003ch2\u003eClass 1 1000mm Cast Iron Bridge Ruler – Professional Inspection \u0026amp; Scribing Measurement Tool\u003c\/h2\u003e\n\n\u003cp\u003eAchieve exceptional dimensional accuracy with this \u003cstrong\u003eClass 1 1000mm Cast Iron Bridge Ruler\u003c\/strong\u003e — 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.\u003c\/p\u003e\n\n\u003cp\u003eIts 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClass 1 Accuracy:\u003c\/strong\u003e Ground and finished to Class 1 tolerance standards for professional-grade precision measurement\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1000mm Span:\u003c\/strong\u003e Extra-long 1000mm (approx. 39.4\") reach covers large workpieces and surface plates in a single pass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCast Iron Construction:\u003c\/strong\u003e High-rigidity grey cast iron body provides stability, vibration damping, and resistance to thermal distortion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBridge Design:\u003c\/strong\u003e Raised arch profile allows the ruler to bridge across surface plate edges and uneven workpiece surfaces\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eScribing \u0026amp; Inspection Ready:\u003c\/strong\u003e Precisely machined edges serve as a scribing guide and straightedge reference for layout work\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlatform Maintenance Use:\u003c\/strong\u003e Ideal for checking flatness and alignment of surface plates, machine tables, and inspection platforms\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNon-Electrified \/ No Hazardous Chemicals:\u003c\/strong\u003e Purely mechanical precision instrument — safe and straightforward to use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 1000mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccuracy Class:\u003c\/strong\u003e Class 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cast Iron\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Bridge Ruler (Scribing \u0026amp; Inspection)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Flatness inspection, scribing layout, surface plate maintenance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrified:\u003c\/strong\u003e No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHazardous Chemicals:\u003c\/strong\u003e None\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho Needs This?\u003c\/h3\u003e\n\u003cp\u003eThis cast iron bridge ruler is the preferred choice for \u003cstrong\u003eprecision machinists, metrology technicians, tool \u0026amp; die makers, and quality assurance teams\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-200mm-jewelry-measuring-caliper-bead-stone-gauge-stainless-steel\"\u003e0–200mm Jewelry Caliper – Stainless Steel Bead \u0026amp; Stone Gauge\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/precision-panel-ruler-push-guide-table-saw-woodworking-positioning-plate\"\u003e1.65M Precision Panel Ruler Push Guide for Table Saw\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-5m-soft-tape-measure-double-scale-60-inch-sewing-tailor-ruler\"\u003e1.5M Soft Tape Measure – Double Scale 60 Inch Sewing Ruler\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on precision measurement standards and best practices in metrology, visit the \u003ca href=\"https:\/\/www.nist.gov\/metrology\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eNIST Metrology Program\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does \"Class 1\" accuracy mean for a cast iron bridge ruler?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is a bridge ruler used for in a workshop or inspection environment?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this bridge ruler suitable for use on granite surface plates?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How should I store and maintain my cast iron bridge ruler?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does \\\"Class 1\\\" accuracy mean for a cast iron bridge ruler?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"What is a bridge ruler used for in a workshop or inspection environment?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"Is this bridge ruler suitable for use on granite surface plates?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"How should I store and maintain my cast iron bridge ruler?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Sewing \u0026 Hand Tools\", \"item\": \"https:\/\/oasis-select.com\/collections\/sewing-hand-tools\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Class 1 1000mm Cast Iron Bridge Ruler – Precision Inspection\", \"item\": \"https:\/\/oasis-select.com\/products\/class-1-1000mm-cast-iron-bridge-ruler-precision-inspection\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"Default Title","offer_id":47745290633321,"sku":"\u003cnone\u003e","price":353.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S3df1615266b842a69aeb73d76d2d6d78N.webp?v=1783031508","url":"https:\/\/oasis-select.com\/products\/class-1-1000mm-cast-iron-bridge-ruler-precision-inspection","provider":"Oasis Select","version":"1.0","type":"link"}