Rc50 Test Block - Starrett Blocks Can Be Used To Test Rockwell Scales. They Are Available In Steel, Brass And Aluminum. Each Block Is Serialized, With A Certificate Detailing The Environmental Conditions Used To Test The Block. Actual Readings Are Given, With The Averages Of These Readings: Min. Reading, Max Reading And A Repeatability Figure. The Blocks Are Calibrated According To Astm E-18 Standards, Ansi (Ncsl) Z540-1, (Iso) 10012-1, Iso/Iec 17025 And Mil-Std 45662A.

• Starrett blocks can be used to test Bench Top Hardness Testers
• Each block is serialized, with a certificate detailing the environmental conditions used to test the block
• Actual readings are given, with the averages of these readings: min. reading, max reading and a repeatability figure
• The blocks are calibrated according to ASTM E-18 standards, ANSI (NCSL) Z540-1, (ISO) 10012-1, ISO/IEC 17025 and Mil-std 45662A.
• Hardness test blocks are designed to be used on one side only
• Indents should be more than .010" from the centers of two indents or no closer to the block's edge than .040"