YAMAMOTO - Hardness Test Block
Brand: Yamamoto - Japan


Rockwell Blocks (64mm diameter)

Scale	Nominal Hardness Value	Variation
HRA	56, 65, 71, 75, 78, 81, 83, 85, 87	+0.3
HRB	32, 42, 52	+0.5
HRB	62, 72, 82, 90, 95, 100	+0.4
HRC	10, 20, 25, 30, 35, 40	+0.15
HRC	45, 50, 55, 60, 62, 64, 67, 70	+0.1
HR15N	75, 80, 85, 87, 90, 92	+0.45
HR30N	41, 50, 60, 67, 73, 78, 81, 83	+0.45
HR15T	78, 82, 87	+0.5
HR30T	32, 42, 52, 62, 72, 78	+0.5
HRE	90	+0.5
HRL	92, 118	+0.5
HRM	67, 107	+0.5
HRR	105, 123	+0.5

Rockwell Blocks (51mm diameter)

Scale	Nominal Hardness Value	Variation
HRC	20, 25, 30, 35, 40, 45	+0.15
HRC	50, 55, 60, 62, 64, 67	+0.1

 
Brinell Blocks (115mm diameter)

Scale	Nominal Hardness Value	Variation
HBW30	150, 180, 200, 229, 250, 300, 350, 400, 450, 500, 550, 600	+0.7%
HBW5	100, 125	+0.7%

Micro Vickers Blocks (25mm diameter)

Scale	Nominal Hardness Value	Variation
HV	100, 200, 300, 400, 500, 600, 700 800, 900	+2.5%