{"product_id":"spi-14-449-3-surface-finish-comparator-6-specimens-nickel","title":"Spi 14-449-3 Surface Finish Comparator 6 Specimens Nickel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 14-449-3 is a nickel surface finish comparator used to visually and tactilely evaluate machined surface textures. It contains 6 specimens covering a range of 0.2 to 6.3 Ra micrometers, equivalent to 8 to 250 AA microinches. Each specimen represents a distinct finish grade produced by vertical grinding, allowing machinists and quality control technicians to compare a workpiece surface directly against a known standard. The comparator includes an instruction sheet and a protective carrying case. It weighs 0.25 pounds and measures 2.5 inches in length by 5 inches in width overall.\u003c\/p\u003e\n\u003cp\u003eThis comparator is used in machine shops, inspection departments, and manufacturing environments where surface finish must be verified against engineering specifications. It is suited for checking ground components in both production and incoming-inspection workflows. Quality technicians, machinists, and metrology personnel use this tool as part of surface texture verification on vertically ground parts. It is not limited to a single industry and is commonly found in aerospace, automotive, and general metalworking applications.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e6 nickel specimens spanning 8, 16, 32, 63, 125, and 250 AA microinches (0.2 to 6.3 Ra micrometers)\u003c\/li\u003e\n  \u003cli\u003eMachining process: vertical grinding — specimens match that specific surface texture pattern\u003c\/li\u003e\n  \u003cli\u003eDual-scale reference: AA microinch and Ra micrometer values for both Imperial and metric specifications\u003c\/li\u003e\n  \u003cli\u003eComplies with ANSI B46.1-1978, Military Specification 45662, and SAE surface finish standards\u003c\/li\u003e\n  \u003cli\u003eIncludes instructions and protective carrying case\u003c\/li\u003e\n  \u003cli\u003eCompact form factor — 2.5 inches by 5 inches overall — for bench or field use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use as a surface finish reference tool on vertically ground nickel-finish workpieces evaluated to AA and Ra scale standards per ANSI B46.1-1978, Military Specification 45662, and SAE requirements.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eNo installation is required. This is a hand-held inspection reference tool. Store specimens in the included case to prevent surface contamination or damage that could affect comparison accuracy. Clean workpiece surfaces before comparison to ensure accurate tactile and visual readings. Handle specimens by the edges to avoid introducing oils or debris onto the reference surfaces.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Nickel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Surface Finish\u003c\/strong\u003e: 8 AA microinches (0.2 Ra micrometers)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Surface Finish\u003c\/strong\u003e: 250 AA microinches (6.3 Ra micrometers)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Specimens\u003c\/strong\u003e: 6\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpecimen Grades\u003c\/strong\u003e: 8, 16, 32, 63, 125, 250 AA microinches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMachining Process\u003c\/strong\u003e: Vertical Grinding\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eScale Type\u003c\/strong\u003e: AA and Ra\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Width\u003c\/strong\u003e: 5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.25 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI B46.1-1978, Military Specification 45662, SAE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncludes\u003c\/strong\u003e: Instructions and carrying case\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: 14-449-3\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51721885679922,"sku":"14-449-3","price":112.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/552ee3d6c55db1652596da723acca322.jpg?v=1788582547","url":"https:\/\/voomisupply.com\/products\/spi-14-449-3-surface-finish-comparator-6-specimens-nickel","provider":"Voomi Supply","version":"1.0","type":"link"}