{"product_id":"spi-13-456-9-combination-square-blade-18-inch-4r","title":"Spi 13-456-9 Combination Square Blade 18 Inch 4R","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 13-456-9 is an 18-inch replacement blade for combination squares, graduated in the 4R system with four graduations: 1\/64, 1\/32, 1\/16, and 1\/8 inch. The blade is finished with a baked enamel coating that protects the graduated markings from wear, corrosion, and shop-floor abrasion. This blade is used to restore or replace a worn combination square blade without replacing the entire tool. Machinists, pipefitters, tool and die workers, and general trade professionals rely on 4R-graduated blades for precise layout work on metal, wood, and composite materials.\u003c\/p\u003e\n\u003cp\u003eThis blade fits standard combination square heads that accept an 18-inch blade. It is suited for use in machine shops, fabrication shops, plumbing layout, electrical rough-in, and any trade application requiring accurate scribing, squaring, or depth measurement. The 4R graduation system provides four scales on a single blade, reducing the need to switch tools during layout. Installation or replacement requires no special tools and takes only a few seconds once the locking screw on the square head is loosened.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e18-inch blade length provides extended reach for larger workpieces and layout tasks\u003c\/li\u003e\n  \u003cli\u003e4R graduation system includes 1\/64, 1\/32, 1\/16, and 1\/8 inch scales on one blade\u003c\/li\u003e\n  \u003cli\u003eBaked enamel finish protects graduation markings from wear and corrosion\u003c\/li\u003e\n  \u003cli\u003eSold individually as a direct replacement blade for combination square sets\u003c\/li\u003e\n  \u003cli\u003eCompatible with standard combination square heads accepting an 18-inch blade\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement blade for combination squares that accept an 18-inch, 4R-graduated blade. No specific compatible head models or part numbers were provided in the product data.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eReplacement is performed by loosening the locking screw or clamp knob on the combination square head, sliding out the worn blade, and inserting the new blade to the desired depth before retightening. No special tools are required beyond what is used to operate the square head's locking mechanism. Inspect the head's groove and locking mechanism for wear before installing a new blade to ensure accurate seating and reliable clamping.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlade Length\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGraduation System\u003c\/strong\u003e: 4R (1\/64, 1\/32, 1\/16, and 1\/8 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Baked Enamel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.5 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SPI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 13-456-9\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51703923573042,"sku":"13-456-9","price":55.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5225d423bb4631aea6b4139caae80be0.jpg?v=1788419483","url":"https:\/\/voomisupply.com\/products\/spi-13-456-9-combination-square-blade-18-inch-4r","provider":"Voomi Supply","version":"1.0","type":"link"}