{"title":"Rockwell Superficial Test Blocks","description":"\u003cul class=\"points\"\u003e\n\u003cli\u003eCalibrated to ASTM E18, ANSI (NCSL) Z540-1, (ISO) 10012-1, ISO\/IEC 17025, ISO 6508\u003c\/li\u003e\n\u003cli\u003eLifetime Guarantee\u003c\/li\u003e\n\u003cli\u003eHighest quality steel, brass and aluminum\u003c\/li\u003e\n\u003cli\u003eRockwell test block surface hand lapped and diamond polished to a mirror finish\u003c\/li\u003e\n\u003cli\u003eSuperior accuracy and ease of testing for the operator\u003c\/li\u003e\n\u003cli\u003eSpecial heat treat process insures maximum consistency and repeatability\u003c\/li\u003e\n\u003cli\u003eRockwell Test Blocks are certified in our ISO\/IEC 17025 accredited laboratory\u003c\/li\u003e\n\u003cli\u003eIn stock for immediate delivery\u003c\/li\u003e\n\u003cli\u003eFree NIST traceable long form certificate with every Rockwell test block\u003c\/li\u003e\n\u003cli\u003eRockwell Test Blocks are provided within a range of +\/- 5 points\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eEach test block has been calibrated on a hardness tester whose accuracy has been verified using N.I.S.T. traceable load and depth measuring devices. The test blocks are made from only the highest quality material to ensure complete uniformity and repeatability. They are hand lapped and polished to a mirror finish. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEach test block is calibrated and marked with its own unique serial number along with the serial number of the indenter or penetrator in the calibration set that they were produced with. Each block comes with the latest test block certification requirements from ASTM and NIST, providing you with the most comprehensive calibration test block available.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"rockwell-superficial-test-block","title":"Rockwell Superficial Test Block","description":"\u003cul\u003e\n\u003cli\u003eCalibrated to ASTM E18, ANSI (NCSL) Z540-1, (ISO) 10012-1, ISO\/IEC 17025, ISO 6508\u003c\/li\u003e\n\u003cli\u003eLifetime Guarantee\u003c\/li\u003e\n\u003cli\u003eHighest quality steel, brass and aluminum\u003c\/li\u003e\n\u003cli\u003eRockwell test block surface hand lapped and diamond polished to a mirror finish\u003c\/li\u003e\n\u003cli\u003eSuperior accuracy and ease of testing for the operator\u003c\/li\u003e\n\u003cli\u003eSpecial heat treat process insures maximum consistency and repeatability\u003c\/li\u003e\n\u003cli\u003eRockwell Test Blocks are certified in our ISO\/IEC 17025 accredited laboratory\u003c\/li\u003e\n\u003cli\u003eIn stock for immediate delivery\u003c\/li\u003e\n\u003cli\u003eFree NIST traceable long form certificate with every Rockwell test block\u003c\/li\u003e\n\u003cli\u003eRockwell Test Blocks are provided within a range of +\/- 5 points\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2546\/6268\/files\/RockCertSample.pdf?430831550652381705\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eCertification Certificate Sample\u003c\/a\u003e \u003cbr\u003e\u003ca href=\"\/index.php\/Accreditations\"\u003eView ISO Scope and Certificates\u003c\/a\u003e\n\u003cdiv\u003e\n\n\u003cb\u003eRockwell Test Blocks manufactured in accordance to the latest Rockwell E18 Revision\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e Rockwell hardness testing is a fast and inexpensive test. The simplicity in the operation of a Rockwell hardness testing machine provides the added advantage that Rockwell hardness testing does not generally require a highly skilled operator to perform. The test is useful for material selection, for process and quality control, and for acceptance testing of commercial products. Rockwell hardness scales are divided into two categories: regular Rockwell scales and superficial Rockwell scales. Both categories of tests use the same types of indenters. The regular Rockwell hardness testing scales use heavier force (load) levels. For these scales, the preliminary force (minor load) level is 10 kgf and the standard total force (load) levels may be 60 kgf, 100 kgf or 150 kgf. The superficial Rockwell hardness testing scales use lighter force (load) levels, typically for use on thinner materials. For the superficial Rockwell scales, the preliminary force (load) level is 3 kgf and the standard total force (load) levels may be 15 kgf, 30 kgf or 45 kgf. The Rockwell hardness test method consists of indenting the test material with a diamond cone or hardened steel ball indenter. The indenter is forced into the test material under a preliminary minor load F0 (Fig. 1A) usually 10 kgf. When equilibrium has been reached, an indicating device, which follows the movements of the indenter and so responds to changes in depth of penetration of the indenter is set to a datum position. While the preliminary minor load is still applied an additional major load is applied with resulting increase in penetration (Fig. 1B). When equilibrium has again been reach, the additional major load is removed but the preliminary minor load is still maintained. Removal of the additional major load allows a partial recovery, so reducing the depth of penetration (Fig. 1C). The permanent increase in depth of penetration, resulting from the application and removal of the additional major load is used to calculate the Rockwell hardness number.\n\n\u003ch2\u003eBest Practices for Rockwell Hardness Testing\u003c\/h2\u003e\n\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003eThe indenter and anvil should be clean and well seated\u003c\/li\u003e\n\u003cli\u003eThe surface to be tested should be clean and dry, smooth, and free from oxide. A rough-ground surface is usually adequate for the Rockwell hardness test\u003c\/li\u003e\n\u003cli\u003eThe surface should be flat and perpendicular to the indenter\u003c\/li\u003e\n\u003cli\u003eTests on cylindrical surfaces will give low readings, the error depending on the curvature, load, indenter, and hardness of the material. Theoretical and empirical corrections for this effect have been published\u003c\/li\u003e\n\u003cli\u003eThe thickness of the specimen should be such that a mark or bulge is not produced on the reverse side of the piece. It is recommended that the thickness be at least 10 times the depth of the indentation. The spacing between indentations should be three to five times the diameter of the indentation. Rockwell hardness test blocks are designed to be used only on one side and the indents no closer to the block's edge than .040\"\u003c\/li\u003e\n\u003cli\u003eThe speed of application of the load should be standardized. This is done by adjusting the dashpot on the Rockwell hardness tester. Variations in rockwell hardness can be appreciable in very soft materials unless the rate of load application is carefully controlled\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003ch2\u003eTypical Application of Rockwell Hardness Testing Scales\u003c\/h2\u003e\n\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003eHRA - Cemented carbides, thin steel and shallow case hardened steel\u003c\/li\u003e\n\u003cli\u003eHRB - Copper alloys, soft steels, aluminum alloys, malleable irons, etc.\u003c\/li\u003e\n\u003cli\u003eHRC - Steel, hard cast irons, case hardened steel and other materials harder than 100 HRB\u003c\/li\u003e\n\u003cli\u003eHRD - Thin steel and medium case hardened steel and pearlitic malleable iron\u003c\/li\u003e\n\u003cli\u003eHRE - Cast iron, aluminum and magnesium alloys, bearing metals\u003c\/li\u003e\n\u003cli\u003eHRF - Annealed copper alloys, thin soft sheet metals\u003c\/li\u003e\n\u003cli\u003eHRG - Phosphor bronze, beryllium copper, malleable irons HRH . . . . Aluminum, zinc, lead\u003c\/li\u003e\n\u003cli\u003eHRK - Phosphor bronze, beryllium copper, malleable irons HRH . . . . Aluminum, zinc, lead\u003c\/li\u003e\n\u003cli\u003eHRL - Phosphor bronze, beryllium copper, malleable irons HRH . . . . Aluminum, zinc, lead\u003c\/li\u003e\n\u003cli\u003eHRM - Soft bearing metals, plastics and other very soft materials\u003c\/li\u003e\n\u003cli\u003eHRP - Soft bearing metals, plastics and other very soft materials\u003c\/li\u003e\n\u003cli\u003eHRR - Soft bearing metals, plastics and other very soft materials\u003c\/li\u003e\n\u003cli\u003eHRS - Soft bearing metals, plastics and other very soft materials\u003c\/li\u003e\n\u003cli\u003eHRV - Soft bearing metals, plastics and other very soft materials\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"WESTport Corp.","offers":[{"title":"15N \/ 72","offer_id":44234660380708,"sku":"HR15N 72","price":112.0,"currency_code":"USD","in_stock":true},{"title":"15N \/ 78","offer_id":43883181080612,"sku":"HR15N 78","price":112.0,"currency_code":"USD","in_stock":true},{"title":"15N \/ 83","offer_id":43883181113380,"sku":"HR15N 83","price":112.0,"currency_code":"USD","in_stock":true},{"title":"15N \/ 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