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Detailed Explanation of Full Classification of Hardness Blocks | Essential Standard Accessories for Calibrating Hardness Testers
2026-05-29
The core function of the hardness block (standard block) used for calibration is to verify whether the error of the hardness tester during operation is within the range specified by international standards. Each hardness block is engraved with a serial number to ensure its international standard traceability; Made of high-quality materials, it can effectively ensure the reliability and stability of hardness values, and is the core standard accessory for hardness tester calibration.
Rockwell hardness block
Rockwell hardness standard block
Specifications: 60-70HRC, 35-55HRC, 20-30HRC, 70-85HRA, 60-70HRA, 85-95HRBW, 60-70HRBW
External dimensions: circular shape with a diameter of Φ 60 × Φ 10 × 10mm
Weight: 0.2 kg/piece
Standard surface Rockwell hardness block
Specification: 88-92 HR15N、74-82HR30N、45-55HR30N、45-55HR45N、85-91HR15T、70-80HR30T、54-72HR45T
External dimensions: circular shape with a diameter of Φ 60 × Φ 10 × 10mm
Weight: 0.2 kg/piece
Brinell hardness block
Brinell hardness standard block
Specification: 150-250 HBW10/3000、150-250HBW5/750、150-250HBW2.5/187.5、500-600HBW10/3000、500-600HBW5/750、500-600HBW5/187.5、75-125HBW10/1000、75-125HBW5/250、75-125HBW2.5/62.5
Dimensions: Φ 90 × 16mm or 60 × 40 × 10mm
Weight: approximately 0.8 kilograms per piece for a diameter of 90 × 16mm; 60 × 40 × 10mm, approximately 0.2 kg/piece
Hammer striking the Brinell strip
Specification: 175-225HBW5/750
Dimensions: 12 × 12 × 150mm
Weight: 0.2 kg/piece
Vickers hardness block
Vickers Hardness Standard Block
Specification: 700-800 HV3、700-800HV5、700-800HV10、700-800HV30、700-800HV50、400-600HV5、400-600HV10、400-600HV30、175-225HV5
Dimensions: 60 × 40 × 10mm
Weight: 0.2 kg/piece
Microhardness block
Standard microhardness block
Specification: 700-800 HV1、800-900HK0.5、700-800HV0.2、400-600HV0.2、400-600HV0.1、175-225HV0.1、175-225HV0.05
External dimensions: 25 × 25 × 8mm (note: industry commonly used specifications are 25 × 25 × 5mm, 8mm is a non-standard thickened version)
Weight: 0.05 kg/piece
Leeb hardness block
Standard Leeb hardness block
Specifications: 750-850HLD, 590-670HLD, 490-570HLD
Dimensions: Φ 90 × 55mm
Weight: 2.75 kg/piece
Specifications: 550-630HLG, 460-540HLG
Dimensions: Φ 120 × 70mm
Weight: 7.5 kg/piece
Other common hardness blocks
In addition to the above types, common ones include Leeb G-type blocks, rubber hardness blocks, Vickers hardness blocks, Shore hardness blocks, Babbitt hardness blocks, etc. Suitable models can be selected according to different calibration requirements.
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