{"product_id":"spi-13-274-6-combination-square-set-12in-4-piece","title":"Spi 13-274-6 Combination Square Set 12in 4-piece","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 13-274-6 is a 4-piece combination square set built for layout, measurement, and inspection work in trade and industrial settings. The set includes a 12-inch hardened steel blade and three interchangeable cast iron heads: a square head, a center head, and a protractor head. Blade graduations follow the 4R pattern, marked in 1\/64-inch, 1\/32-inch, 1\/16-inch, and 1\/8-inch increments, giving the user multiple reference scales on a single blade. This set is used by machinists, pipefitters, ironworkers, and general tradespeople who need reliable angle, depth, and layout readings on the job.\u003c\/p\u003e\n\u003cp\u003eThe 13-274-6 set is suited for both shop and field use. The square head is used for 90-degree and 45-degree angle layout. The center head locates center points on round stock. The protractor head reads angles for miter, bevel, and custom-angle layout. All three heads mount to the same 12-inch blade, making the set a compact, multi-function layout tool for metal fabrication, mechanical assembly, and structural work.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e12-inch hardened steel blade for durability and long-term accuracy\u003c\/li\u003e\n  \u003cli\u003e4R graduation pattern: 1\/64, 1\/32, 1\/16, and 1\/8 inch scales on one blade\u003c\/li\u003e\n  \u003cli\u003eThree cast iron heads included: square, center, and protractor\u003c\/li\u003e\n  \u003cli\u003eInterchangeable heads work on a single shared blade\u003c\/li\u003e\n  \u003cli\u003eHardened steel blade resists wear from repeated use and sliding\u003c\/li\u003e\n  \u003cli\u003eCompact 4-piece design covers most common layout and inspection tasks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a general-purpose combination square set compatible with standard 12-inch blade layout applications across metal fabrication, mechanical assembly, and structural trade work.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eNo installation is required for this tool. Before use, verify that all head locking mechanisms are fully tightened to prevent blade slippage during measurement. Inspect the blade and head contact surfaces for burrs or debris that could affect reading accuracy. Store the set in a dry environment to prevent rust on the hardened steel blade and cast iron heads.\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: 12 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\/64 inch, 1\/32 inch, 1\/16 inch, 1\/8 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Types Included\u003c\/strong\u003e: Square, Center, Protractor\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: 2.55 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 27111803\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: 13-274-6\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51700773257522,"sku":"13-274-6","price":165.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/4a1e24e4cd4ec7e1cf75cd39950a0ce5.jpg?v=1788395132","url":"https:\/\/voomisupply.com\/products\/spi-13-274-6-combination-square-set-12in-4-piece","provider":"Voomi Supply","version":"1.0","type":"link"}