{"product_id":"starrett-52680-steel-rule-18-in-4r-graduation-rigid","title":"Starrett 52680 Steel Rule 18 in 4R Graduation Rigid","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 52680 is an 18-inch rigid steel rule designed for precise linear measurement in trade and industrial applications. Manufactured from spring steel with a satin chrome-plated finish, it delivers clean readability and corrosion resistance under shop conditions. The rule carries 4R graduation, meaning four scales are present: 1\/16, 1\/32, 1\/64, and 1\/8 inch. At 1-1\/8 inches wide and 0.050 inches thick, it lays flat and reads clearly without flexing. Machinists, pipefitters, sheet-metal workers, and fabricators reach for this rule when they need consistent, repeatable measurements on the bench or in the field.\u003c\/p\u003e\u003cp\u003eThe 52680 suits general layout and inspection work in fabrication shops, mechanical rooms, plumbing rough-in, and HVAC duct work. Its rigid construction keeps the blade from bowing across longer spans, which matters when scribing lines or checking material dimensions. The horizontal scale orientation and silver satin-chrome surface reduce glare under artificial lighting, making graduation marks easy to read in low-light service environments. It is sold individually and requires no accessories for standard use.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e4R graduation: four scales in one rule (1\/16, 1\/32, 1\/64, and 1\/8 inch)\u003c\/li\u003e\n\u003cli\u003eRigid spring steel construction resists flexing across the full 18-inch length\u003c\/li\u003e\n\u003cli\u003eSatin chrome-plated finish reduces glare and improves graduation contrast\u003c\/li\u003e\n\u003cli\u003e1-1\/8-inch width provides a stable lay-flat surface for scribing and layout\u003c\/li\u003e\n\u003cli\u003e0.050-inch blade thickness balances durability with compact profile\u003c\/li\u003e\n\u003cli\u003eNon-magnetic, no hook included — straightforward layout tool\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard rigid steel rule suitable for general-purpose measurement and layout tasks across machining, fabrication, plumbing, HVAC, and electrical trade work.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eNo installation is required for this measuring tool. Store flat to prevent warping and avoid contact with abrasive surfaces that could wear graduation markings. Clean with a dry or lightly oiled cloth to maintain the chrome finish and prevent surface rust in humid environments. Do not use this rule as a cutting guide with rotary tools, as edge damage will compromise measurement accuracy.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Spring Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 1-1\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.0500 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGraduation Style\u003c\/strong\u003e: 4R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGraduation Scales\u003c\/strong\u003e: 1\/16, 1\/32, 1\/64, 1\/8 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Satin Chrome-Plated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor\u003c\/strong\u003e: Silver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexibility\u003c\/strong\u003e: Rigid\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale Orientation\u003c\/strong\u003e: Horizontal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnetic\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes Hook\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.313 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 41111604\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: STARRETT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 52680\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51539363561778,"sku":"52680","price":136.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/46cc4a7df93a7063ebb50eb80ac3224b.jpg?v=1785838838","url":"https:\/\/voomisupply.com\/products\/starrett-52680-steel-rule-18-in-4r-graduation-rigid","provider":"Voomi Supply","version":"1.0","type":"link"}