{"product_id":"12ft-x-8ft-x-2ft-granite-surface-plate-grade-b-precision-flat-work","title":"12ft x 8ft x 2ft Granite Surface Plate Grade B - Precision Flat Work","description":"\u003cp\u003eIn this review of the 12' x 8' x 2' Granite Surface Plate Grade B, the bottom line is simple: it is a solid, affordable bench-grade flat reference for small shops and inspection benches. The plate's top surface is precision ground to achieve a high degree of flatness with an accuracy of +\/-.0001' and it ships with a certificate of inspection, so the main reason to buy is dependable dimensional reference on a practical scale for layout, height gage work and calibrations where NIST traceability is not required.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision ground top:\u003c\/strong\u003e The surface is finished to a tight flatness tolerance of +\/-.0001' so it performs well as a baseline for measurement and inspection tasks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade B accuracy:\u003c\/strong\u003e As a Grade B (Grade 1) plate, it balances cost and capability for routine calibration and layout work in small shops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertificate of inspection:\u003c\/strong\u003e Each plate includes a certificate confirming measurements were checked, giving confidence in its declared flatness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-magnetic and non-conductive:\u003c\/strong\u003e Granite construction eliminates magnetic interference and resists conductivity, useful when working with electronic-sensitive parts or instruments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple uses:\u003c\/strong\u003e The plate serves as a work surface for assembling, inspecting, marking parts and for checking squareness, parallelism and heights with a height gage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto-collimator checked:\u003c\/strong\u003e HHIP inspects plates by auto collimator for overall accuracy assurance, helping ensure consistent performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis plate suits small machine shops, toolrooms and inspection benches that need a reliable, mid-accuracy reference surface for layout, checking flatness and using a height gage. Its 12' by 8' footprint gives ample area for small fixtures and parts while still being manageable to position on a bench.\u003c\/p\u003e\n\u003cp\u003eUsers who require NIST traceable calibration or the highest laboratory-grade tolerances should look for lab-certified, traceable alternatives; similarly, those needing a polished or mirror finish for optical work should consider a different plate. For routine dimensional tasks and general shop use, this plate is appropriate and cost-effective.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolid flatness claim of +\/-.0001' provides a dependable reference for inspection and layout work.\u003c\/li\u003e\n\u003cli\u003eIncludes a certificate of inspection, so buyers receive documented verification of measurements.\u003c\/li\u003e\n\u003cli\u003eGranite construction is non-magnetic and non-conductive, beneficial around sensitive instruments.\u003c\/li\u003e\n\u003cli\u003eSize and weight are well suited to small shops needing a stable work surface without a full metrology table.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot NIST traceable, so it is not intended for formal laboratory calibrations that require traceability.\u003c\/li\u003e\n\u003cli\u003eSurface finish reports are mixed by customers, with some noting variation in smoothness and polish.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct\u003c\/td\u003e\n\u003ctd\u003e12' x 8' x 2' Granite Surface Plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrade\u003c\/td\u003e\n\u003ctd\u003eGrade B (Grade 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlatness \/ Accuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-.0001'\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eGranite (non-magnetic, non-conductive)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInspection\u003c\/td\u003e\n\u003ctd\u003eCertificate of inspection included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eMeets or exceeds Federal Specifications GGG-P-463C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInspection method\u003c\/td\u003e\n\u003ctd\u003eChecked by auto collimator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 12' x 8' x 2' Grade B granite plate is a practical, value-oriented choice for small shops and inspection benches that need a dependable flat reference without lab-level traceability. It delivers useful accuracy, a verified inspection certificate and the non-magnetic benefits of granite, making it a good buy where documented but not NIST-traceable performance is acceptable.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this plate NIST traceable?\u003c\/strong\u003e\u003cbr\u003eNo. The plate includes a certificate of inspection but is not NIST traceable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this with a height gage?\u003c\/strong\u003e\u003cbr\u003eYes. The plate is intended as a flat reference surface for measuring heights, checking parallelism and using height gages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the granite surface magnetic?\u003c\/strong\u003e\u003cbr\u003eNo. Granite is non-magnetic and non-conductive, which helps avoid magnetic interference with instruments.\u003c\/p\u003e","brand":"HHIP","offers":[{"title":"Default Title","offer_id":48688414556379,"sku":"B08BXND2Z1","price":62.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/814waJa8izL._SL1500.jpg?v=1778720824","url":"https:\/\/gearmusthave.com\/products\/12ft-x-8ft-x-2ft-granite-surface-plate-grade-b-precision-flat-work","provider":"GearMustHave","version":"1.0","type":"link"}