{"product_id":"granite-surface-plate-15-7-x-15-7-x-2-36-in-grade-a-precision","title":"Granite Surface Plate 15.7 x 15.7 x 2.36 in - Grade A Precision","description":"\u003cp\u003eIn this review the HHIP 15.7 x 15.7 x 2.36 in Grade A granite surface plate is evaluated for small shops and inspection benches that need a stable, low-maintenance reference surface. The bottom line: this plate is best for machinists, inspectors, and hobbyists who want a hard, non-magnetic, non-conductive work surface with a certified flatness of +\/-.0001 in for routine layout, squareness checks, and height gage work. It offers measurable precision without the premium cost of larger, NIST-traceable systems.\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 precision ground to deliver a high degree of flatness so measurements and layouts remain consistent.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade A accuracy:\u003c\/strong\u003e As a Grade A (Grade 0) plate with +\/-.0001 in accuracy, it supports fine dimensional checks and calibration tasks in a small shop environment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertificate of inspection:\u003c\/strong\u003e The included certificate documents the plate's flatness verification, providing confidence for inspection and setup use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable granite construction:\u003c\/strong\u003e Being non-magnetic, non-conductive and harder than steel, the plate resists nicks and burrs and serves as a long-lasting work surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile use:\u003c\/strong\u003e It is suited for measuring flatness and squareness, laying out parts, calibrating instruments, setting up tools, and use with a height gage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e HHIP checks plates with an auto collimator for overall accuracy assurance so buyers get a verified flat surface.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe plate is ideal for small machine shops, toolrooms, and inspection benches where a compact, accurate reference surface is needed for layout, gaging and setup. Its 15.7 x 15.7 in footprint gives enough area for most height gage and small fixture tasks without occupying excessive bench space.\u003c\/p\u003e\n\u003cp\u003eProfessionals who require NIST-traceable certification or very large working areas should look elsewhere; likewise, users needing a highly polished mirror finish for optical work may prefer a different grade or finish. For routine dimensional work, this plate is a practical, cost-effective choice.\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 documented flatness of +\/-.0001 in gives reliable reference accuracy for inspection tasks.\u003c\/li\u003e\n\u003cli\u003eNon-magnetic, non-conductive granite resists nicks and remains stable over time compared with softer materials.\u003c\/li\u003e\n\u003cli\u003eIncludes a certificate of inspection and is checked by auto collimator for quality assurance.\u003c\/li\u003e\n\u003cli\u003eCompact size and substantial weight make it a solid, vibration-resistant work surface for small shops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCertificate is not NIST traceable, so it is not suitable where formal traceability is required.\u003c\/li\u003e\n\u003cli\u003eSurface finish and perceived flatness received mixed feedback from some users, so expectations about polish may vary.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHHIP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel size\u003c\/td\u003e\n\u003ctd\u003e15.7 x 15.7 x 2.36 in\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+\/-.0001 in\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\u003eCertification\u003c\/td\u003e\n\u003ctd\u003eCertificate of inspection (not NIST traceable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe HHIP Grade A 15.7 x 15.7 x 2.36 in granite surface plate is a sensible, value-focused choice for small shops and inspectors who need a durable, accurate reference surface without NIST traceability. It balances precision, durability, and footprint well, making it a practical tool for layout, gaging and assembly tasks where documented flatness and a stable work plane matter.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs the plate NIST traceable?\u003c\/strong\u003e\u003cbr\u003eNo, the included certificate of inspection is not NIST traceable; it documents measured flatness but does not provide NIST traceability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this plate be used with a height gage?\u003c\/strong\u003e\u003cbr\u003eYes, the 15.7 x 15.7 in top and Grade A accuracy make it suitable for height gage work and routine dimensional checks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the surface nick or magnetize?\u003c\/strong\u003e\u003cbr\u003eNo, granite is non-magnetic and harder than steel so it resists nicks and burrs and will not magnetize.\u003c\/p\u003e","brand":"HHIP","offers":[{"title":"Default Title","offer_id":48247741055195,"sku":"B0DRW9QVDB","price":224.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61IFFKzJlRL._SL1020_cd4d3a1d-3f6d-43aa-982e-31c7fb4cd5cd.jpg?v=1771067237","url":"https:\/\/gearmusthave.com\/products\/granite-surface-plate-15-7-x-15-7-x-2-36-in-grade-a-precision","provider":"GearMustHave","version":"1.0","type":"link"}