Yamamoto Metal Hardness Test Block

To verify hardness tester to be in good working condition

Features

To verify hardness tester to be in good working condition

To control various industrial hardness testers, it is important to verify all related factors, inculiding indenters, static and dynamic loads, indentation measurement, and sample pieces. Hardness blocks allow overall control of this coomplicated factors in the field. Therefore, it is imperative that a uniform surface hardness is displayed by all our test blocks, that the main factors of secular change are eliminated and, if possible, that the characteristic of their materials are similar to those of materials in practical use.

Material and manufacturing process

Yamamoto’s blocks are first cut from a plate material to avoid being affected by center segregation. After machining to the required shapes, heat treatment is carefully applied to the blocks to get a stable microstructure and the required hardness level.

After heat treatment is completed, the blocks are ground, lapped, and then undergo a thorough polishing process, followed by wet buffing to improve measuring precision and achieve the most accurate and consistent hardness available.

Yamamoto Metal Hardness Test Block has been manufactured since 1939 and maintained her reputation as the best in this field. The company received ISO 9001 Quality System certificate in 1997, issued by Japan Quality Assurance Organization (JQA).

Features and Benefits:

Regular, Superficial and Special Blocks

High precision, precision hardness tolerance

Certified blocks traceable to NIST

Calibrated in accordance with ASTM E18-00 section C using NIST Rockwell HRC standard reference material

Specifications

Assortment	Hardness Value	Tolerance	Calibration Number	Variation (R=Max-Min)	Materials (JIS Notation)	Dimension (mm)	Finished Surface	Standard Based
HMV (1, 0.1)	1650	±10%	4(2×2)	2% (HV1)	Si3N4	Ø10×5	Super Finish	JIS B 7735
HMV (1, 0.1, 0.01)	900, 800, 700, 600, 500	±15	6(3×2)	5% (HV0.1)	SK85	Ø25×6	Super Finish	JIS B 7735
–	400, 300, 200 (Be Copper)	±15	–	–	C1720P	Ø25×6 (2)	Super Finish	–
–	100 (C2600P), 40 (C1020-)	±10	–	7(100HV0.1), 4(40HV0.1)	←	Ø25×5, Ø25×6	Super Finish	–
HMV (0.1, 0.01, 0.001)	30 (AU)	±10	–	4(HV0.1)	Au	Ø25×5 (0.8)	Super Finish	–
UMV (0.01, 0.002)	900, 700 (Berkovich 9.8mN tested)	±20%	6(3×2)	10% (HV0.01)	SK85	Ø25×6	Super Finish (Fine)	JIS B 7735
– (0.01, 0.002)	500, 200 (-)	–	–	–	SK85, C1720P	Ø25×6 (2)	Super Finish (Fine)	–
*Nano Indentation Hardness Blocks		APPROX340	6(3×2 HV, Nano)		Syngle Crystal	Ø25×6	Super Finish (Fine)	JIS B 7735
HN-W		HV0.001			Tungsten	(W:Ø9×6)
(HV0.01, 0.001 Berkovich 9.8mN tested)
HV (30, 1)	1000(SK120), 900, 800, 700	±15	10(5×2)/HV30, 10	1.5%	SKS3	Ø64×15	Buffing	JIS B 7735
HV (10, 1)	600, 500, 400, 300, 200(SK85), 150(S45C)	–	6(3×2)/HV1	–	←	–	Buffing	–
–	100 (C2600P), 40(C1020P)	±10		(150HV and below 2.2%	←	Ø64×10	Buffing	–
HS	100(SK120), 95,90,80,70, 60,50, 40, 30	±2	HV10(5×2)	VHS≤1.5(70HS and below 1.2)	SK85	Ø64×15	Buffing	JIS B 7731
–	20(S20C), 7(C1020PØ64×10)	–	HS10(5×2)	∠HS(HS-VHS)≤0.5	←	–	Buffing	–
HL	HLE(Dia)850, 800, 700, 600, 500	±15	(HV Calibration)		SK85	Ø115×33	Buffing	JIS B 7731
–	HLD(WC)880, 830, 730, 630, 520	–	(HV Calibration)		–	–	Buffing	Related
HRC	70(SK120), 67, 64, 62, 60	±1	10(5×2)	0.2	SKS3	Ø64×15	Buffing	JIS B 7730
–	57, 55, 50, 45, 40, 35, 30, 25, 20, 10	–	–	(40HRC and below 0.3)	SK85	–	Buffing	–
HRA	87, 85, 83, 81, 78, 75, 71, 65, 56	–	–	0.3	Same as HRC	–	Buffing	–
HR30N	83, 81, 78, 73M 67, 60, 55, 50, 41	–	–	0.6	–	–	Buffing	–
HR15N (45N)	92, 90, 87, 85, 80, 75 (43) (23)	–	–	–	–	–	Buffing	–
HRBS	100, 95, 90	±2	10(5×2)	0.8	SK85	Ø64×10	Plate Lapping	JIS B 7730
–	82, 72, 62, 52, 42, 32	–	–	(50HRB and below 0.1)	C2600P	–	Plate Lapping	–
HR30T S	78, 72, 62, 52, 42, 38, 32	–	–	1.0	Same as HRB	–	Buffing	–
HR15T S	87, 82, 78	–	–	–	–	–	Buffing	–
HR (E•M•L•R•F•S)	HRE90 HRM107 HRL118 HRR123 HRF90	–	–	–	(100HV)	–	Buffing	JIS K 7202
–	HRM67 HRL92 HRR105 HRS90	–	–	–	(40HV)	–	Buffing	–
HBW (10/3000)	600, 550, 500, 450, 400, 350	±15	6(3×2)	1.5%	SK85	Ø115×18	Fine Grinding	JIS B 7736
–	300, 25, 229(d=4mm), 200, 180	–	–	–	–	–	Fine Grinding	–
	HBW(10/3000) 150, HBW(10/500) 125	–	–	2.5%	S45C	–	Fine Grinding	–
	HBW(10/500) 100	–	–	3%	S10C	–	Fine Grinding	–
HRC	67, 64, 62, 60	±1	6(3×2)			Ø50.8×6.4		(ASTM E-18)
HRC	55, 50, 45, 40, 35, 30, 25, 20	±1	6(3×2)			(Ø2″x1/4″)		(ASTM E-18)

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