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YAMAMOTO SCIENTIFIC TOOL LABORATORY

Standard Blocks for Hardness

HMV JIS B 7735
UMV JIS B 7735
HN-W JIS B 7735
HV JIS B 7735
HS JIS B 7731
HL JIS B 7731
HR C JIS B 7730
HR A
HR30N
HR15N
HR45N
HRB W JIS B 7730
HR30T
HR15T
HREW JIS K 7202
HRMW
HRLW
HRRW
HRFW
HRSW
HBW JIS B 7736

YC-Charpy V-Notch Test Blocks

Type A 30J Five pcs. for each types
Type B 100J
Type C 160J

※ Satisfies JIS B 7740 & ISO

Standard Microstructure

Group 1 Ferrous-Carbon Steel ・ Cast Iron 25Types
Group 2 Alloy Tool Steel ・ High Speed Steel 25Types
Group 3 Structural Alloy Steel ・ Steel for Special uses 25Types
Group 4 Standard Microstructure ・ Non-ferrous Alloy 25Types
Group 6 Standard Microstructure ・ Surface modification of Metals 25Types
Group 7 Standard Microstructure ・ Abnormal Structure 23Types

Standard Piece Sets of JIS Steel Materials

Group for Educational Applications Group K
Group for Specialized Applications Carbon Steel Group F
Tool Steel Group G
Structural & Special Steel Group H

Hardnester

Hardnester for general use for precision tools
Rockwell “C” 8 Hardness Set Vickers 8 Hardness Set Vickers 16 Hardness Set
No. Ⅰ HRC 20 HV 200 HV 200-250
No. Ⅱ HRC 30 HV 300 HV 300-350
No. Ⅲ HRC 40 HV 400 HV 400-450
No. Ⅳ HRC 50 HV 500 HV 500-550
No. Ⅴ HRC 55 HV 600 HV 600-650
No. Ⅵ HRC 60 HV 700 HV 700-750
No. Ⅶ HRC 65 HV 800 HV 800-850
No. Ⅷ HRC 67 HV 900 HV 900-950