{"product_id":"hhip-4401-2418-black-granite-surface-plate-24in-x-18in-x-3in","title":"HHIP 4401-2418 Black Granite Surface Plate 24in x 18in x 3in","description":"\u003cp\u003eIn this review of the HHIP 4401-2418 Black Granite Surface Plate, the bottom line is simple: this is a practical, hard-wearing flat reference surface for small shops and inspection benches that need reliable flatness without premium traceability. The plate's Grade A (Grade 0) finish and precision-ground top are the single biggest reasons to consider it, delivering an advertised accuracy of +\/-.000075 in across a usable 24in by 18in area. It ships with a certificate of inspection and enough mass to stay put while measuring, making it a straightforward choice for routine layout, calibration with a height gage, and assembly tasks.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision-ground top:\u003c\/strong\u003e The surface is ground to a high degree of flatness so users can trust contact measurements and layout work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade A accuracy:\u003c\/strong\u003e The +\/-.000075 in specification supports fine dimensional checks and calibration tasks for small- to medium-size parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertificate of inspection:\u003c\/strong\u003e Each plate includes documentation of its checked accuracy for quality control purposes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-magnetic and non-conductive:\u003c\/strong\u003e Granite construction avoids magnetic interference and electrical conduction during sensitive measuring and assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable, harder than steel:\u003c\/strong\u003e The granite resists nicks and burrs, providing a long-lasting flat surface for inspection and marking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstantial weight:\u003c\/strong\u003e At about 150 lb, the plate resists movement during measurement and provides stable support for height gages.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis surface plate is aimed at small machine shops, toolrooms, inspection benches, and hobbyists who need a reliable, rigid reference plane for measuring flatness, checking squareness, laying out parts, and using a height gage. Its 24in by 18in footprint is well suited to small- to medium-size fixtures and assemblies where a compact, accurate surface is required.\u003c\/p\u003e\u003cp\u003eThose who require NIST traceable certification, larger working areas, or a polished finish for ultra-critical lab environments should consider higher-end options or lab-grade plates; this model is best for practical shop use and routine calibration where the supplied inspection certificate is sufficient.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSolid Grade A flatness specification that supports precise measurement and layout tasks.\u003c\/li\u003e\n\u003cli\u003eDurable granite construction that resists nicks and is non-magnetic and non-conductive.\u003c\/li\u003e\n\u003cli\u003eIncludes a certificate of inspection for quality assurance and is heavy enough to stay stable during use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eNot NIST traceable, so it may not meet strict laboratory calibration requirements.\u003c\/li\u003e\n\u003cli\u003eSurface finish reports are mixed among users; some may expect a more polished top depending on application.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e4401-2418\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eBlack granite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrade\u003c\/td\u003e\n\u003ctd\u003eGrade A (Grade 0)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-.000075 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e24 in x 18 in x 3 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApproximately 150 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertificate\u003c\/td\u003e\n\u003ctd\u003eIncludes certificate of inspection (not NIST traceable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe HHIP 4401-2418 is a practical, value-oriented granite surface plate that performs well for small shops and inspection benches where a Grade A reference plane is needed. With precision grinding, a supplied inspection certificate, and robust weight, it offers dependable flatness for layout, height gage work, and assembly tasks, though labs needing NIST traceability should look elsewhere.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this plate NIST traceable?\u003c\/strong\u003e\u003cbr\u003eNo, the plate includes a certificate of inspection but it is not NIST traceable.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use this for height gage calibration?\u003c\/strong\u003e\u003cbr\u003eYes, the flat surface and +\/-.000075 in accuracy make it suitable for measuring heights and checking squareness with a height gage in shop environments.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the granite surface prone to chipping?\u003c\/strong\u003e\u003cbr\u003eThe granite is harder than steel and resists nicks and burrs, but users should still handle the plate carefully to avoid impact damage.\u003c\/p\u003e","brand":"HHIP","offers":[{"title":"Default Title","offer_id":48177268326619,"sku":"B01LTHIHCK","price":284.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51BlWIU93HL._SL1000.jpg?v=1769453064","url":"https:\/\/gearmusthave.com\/products\/hhip-4401-2418-black-granite-surface-plate-24in-x-18in-x-3in","provider":"GearMustHave","version":"1.0","type":"link"}