{"product_id":"granite-surface-plate-15-7-x-9-8-x-2-36-in-grade-a-precision","title":"Granite Surface Plate 15.7 x 9.8 x 2.36 in - Grade A Precision","description":"\u003cp\u003eIn this review of the 15.7 x 9.8 x 2.36 in Grade A Granite Surface Plate the bottom line is straightforward: it is a practical, stable reference surface for small shops and inspection benches where flatness matters more than traceable calibration. The plate's top surface is precision ground to a high degree of flatness with an accuracy of +\/-.0001 in, and it ships with a certificate of inspection that confirms compliance with Federal Specifications. For someone needing a non-magnetic, hard work surface for layout, height gaging, and visual inspection, this plate offers strong value.\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 top surface is ground to achieve high flatness, giving a reliable reference for measuring and laying out parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade A accuracy:\u003c\/strong\u003e With Grade A (Grade 0) accuracy of +\/-.0001 in, the plate is suited to close-tolerance inspection tasks common in small machine shops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertificate of inspection:\u003c\/strong\u003e Each plate includes a certificate that shows it meets or exceeds Federal Specifications GGG-P-463C, useful for shop records.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-magnetic and non-conductive:\u003c\/strong\u003e Being granite, the surface will not magnetically interfere with sensitive parts and is electrically insulating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable work surface:\u003c\/strong\u003e Harder than steel, the plate resists nicks and burrs and serves well for assembly, marking, and setup work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile usage:\u003c\/strong\u003e Useful for checking flatness, squareness, parallelism, perpendicularity and as a stable base for height gages.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis plate is best for small to medium machine shops, inspection benches, toolrooms, and hobbyists who need a stable, hard reference surface for layout work and height gaging. The size is convenient for bench-top use and offers ample area for many common dimensional checks without occupying a large footprint.\u003c\/p\u003e\n\u003cp\u003eThose who require NIST-traceable certification, very large surface plates, or a mirror-polished finish should look elsewhere; the included certificate confirms federal spec compliance but does not provide NIST traceability, and customer feedback indicates surface smoothness can vary between units.\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\u003eHigh flatness accuracy of +\/-.0001 in delivers a reliable reference for precision checks.\u003c\/li\u003e\n\u003cli\u003eDurable, non-magnetic granite resists nicks and is a stable work surface for assembly and inspection.\u003c\/li\u003e\n\u003cli\u003eIncludes a certificate of inspection and meets Federal Specifications GGG-P-463C for quality assurance.\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 and some buyers report variability in surface smoothness or polish between units.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e4401-4025\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eGranite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall size\u003c\/td\u003e\n\u003ctd\u003e15.7 x 9.8 x 2.36 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrade \/ Accuracy\u003c\/td\u003e\n\u003ctd\u003eGrade A (Grade 0), +\/-.0001 in\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\u003eCertificate\u003c\/td\u003e\n\u003ctd\u003eIncluded (not NIST traceable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProperties\u003c\/td\u003e\n\u003ctd\u003eNon-magnetic, non-conductive, harder than steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe HHIP 15.7 x 9.8 x 2.36 in Grade A Granite Surface Plate is a sensible, cost-effective choice for shops that need a dependable flat reference and a tough work surface without the premium of traceable calibration. It is good value for bench-level inspection, layout, and height gage work, though buyers seeking perfect surface polish or NIST traceability should consider higher-tier options.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this plate come with calibration paperwork?\u003c\/strong\u003e\u003cbr\u003eYes, it ships with a certificate of inspection confirming compliance with Federal Specifications GGG-P-463C, but it is not NIST traceable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the surface magnetic or conductive?\u003c\/strong\u003e\u003cbr\u003eNo, the granite surface is non-magnetic and non-conductive, making it suitable for work on delicate electronic or magnetic parts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this plate for height gage measurements?\u003c\/strong\u003e\u003cbr\u003eYes, the plate is intended as a stable reference for height gages, checking flatness, squareness, and other dimensional tasks.\u003c\/p\u003e","brand":"HHIP","offers":[{"title":"Default Title","offer_id":48196126802139,"sku":"B0BN5VG79Z","price":197.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61IFFKzJlRL._SL1020_51fcb7d9-6ed5-48a9-8a6c-be24e93da07b.jpg?v=1770354529","url":"https:\/\/gearmusthave.com\/products\/granite-surface-plate-15-7-x-9-8-x-2-36-in-grade-a-precision","provider":"GearMustHave","version":"1.0","type":"link"}