{"product_id":"spi-13-277-9-combination-square-set-18in-4-piece","title":"Spi 13-277-9 Combination Square Set 18in 4-piece","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 13-277-9 is a 4-piece combination square set built for layout, inspection, and measurement work in trade and industrial settings. The set includes a square head, protractor head, and center head, all compatible with an 18-inch hardened steel blade graduated in 4R style. The 4R graduation delivers four scales: 1\/8, 1\/16, 1\/32, and 1\/64 inch markings on opposing faces, giving machinists, pipefitters, fabricators, and tool-and-die professionals precise reference in a single blade. Cast iron heads provide rigidity and resistance to wear under shop conditions.\u003c\/p\u003e\n\u003cp\u003eThis combination square set is suited for general layout and angle work in machine shops, fabrication facilities, and on industrial job sites. The square head handles 45-degree and 90-degree layout. The protractor head allows angle measurement across the blade. The center head locates the center of round stock quickly and accurately. All three heads accept the same 18-inch blade, so the set functions as a versatile system rather than a collection of single-purpose tools.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e18-inch hardened steel blade for durability and long-term accuracy\u003c\/li\u003e\n  \u003cli\u003e4R graduation: 1\/8, 1\/16, 1\/32, and 1\/64 inch scales for fine layout work\u003c\/li\u003e\n  \u003cli\u003eThree interchangeable heads: square, protractor, and center\u003c\/li\u003e\n  \u003cli\u003eCast iron head construction resists wear and maintains squareness under repeated use\u003c\/li\u003e\n  \u003cli\u003e4-piece configuration covers a broad range of layout and inspection tasks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a self-contained 4-piece combination square set; all three heads are compatible with the included 18-inch 4R hardened steel blade.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eCombination squares are hand-held layout and inspection tools that require no installation. Store the set away from moisture and cutting fluids to prevent rust on the blade and corrosion on the cast iron heads. Verify blade lock tightness before transferring measurements to avoid blade shift. Periodically check head-to-blade squareness with a known reference surface to confirm accuracy is maintained.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Pieces\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlade Length\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGraduation Style\u003c\/strong\u003e: 4R\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGraduation Increments\u003c\/strong\u003e: 1\/8, 1\/16, 1\/32, 1\/64 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Types\u003c\/strong\u003e: Square, Protractor, Center\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlade Material\u003c\/strong\u003e: Hardened Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Material\u003c\/strong\u003e: Cast Iron\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3.28 pounds\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: 13-277-9\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51711385043250,"sku":"13-277-9","price":266.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ce05fa09f648c473cd7f0b0d45349515.jpg?v=1788476202","url":"https:\/\/voomisupply.com\/products\/spi-13-277-9-combination-square-set-18in-4-piece","provider":"Voomi Supply","version":"1.0","type":"link"}