Wilson Instruments Rockwell test blocks set the standard for the industry and are made from the highest quality material to insure the most uniform and repeatable blocks available. Precision lapping guarantees a block surface rating (finish) of less than three micro-inches and a test and supporting surface of extreme flatness and parallelism Rockwell Test blocks are calibrated to meet American and international standards at the Wilson Instruments Hardness Calibration Laboratory in Canton, Massachusetts. The Wilson lab is accredited to ISO / IEC 17025 by NVLAP and the testers used in the calibration process undergo a stringent monitoring process using NIST traceable devices. Wilson Instrument's attention to detail and precision is unsurpassed in the test block industry. NVLAP certificate includes measurement uncertainty value.
A comprehensive variety of scales and blocks are available to meet the wide ranges and scales associated with Rockwell testing.
Custom test blocks and scales are available, contact us for more information
Principle of Operation
Rockwell test blocks provide a relatively easy and inexpensive means for verifying tester, indenter, and system performance. Rockwell hardness test blocks are reference materials, standardized to determine the average hardness of the block surface. The resultant certified value provides a reference number and tolerance that should be met during the tester verification process to insure compliance with performance standards. Checking against test blocks should be a daily procedure; generally it is recommended that the high, middle, and low range of the given scale is verified. A minimum of five tests should be performed on the standardized surface of the block – the average must fall within the tolerance of the indicated block value for the tester to be considered in calibration.
Note: All block values listed are nominal levels, the actual calibrated value will vary. For more information, please refer to the "Hardness Range" section under block details.