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Weight - Load - Indentor Chart

Scale Symbol Indentor Type Preliminary Force N (kgf) Total Force N (kgf) Typical Applications
A Spheroconical Diamond 98.07 (10) 588.4 (60) Cemented carbides, thin steel, and shallow case hardened steel
B 1/16” Carbide Ball 98.07 (10) 980.7 (100) Copper alloys, soft steels, aluminum alloys, malleable iron, etc.
C Spheroconical Diamond 98.07 (10) 1471 (150) Steel, hard cast irons, pearlitic malleable iron, titanium, deep case hardened steel, other harder than HRB 100
D Spheroconical Diamond 98.07 (10) 980.7 (100) Thin steel and medium case hardened steel, and pearlitic malleable iron
E 1/8” Carbide Ball 98.07 (10) 980.7 (100) Cast Iron, Aluminum and magnesium alloys, and bearing metals
F 1/16” Carbide Ball 98.07 (10) 588.4 (60) Annealed copper alloys and thin soft sheet metals
G 1/16” Carbide Ball 98.07 (10) 1471 (150) Malleable irons, copper-nickel-zinc and cupro-nickel alloys
H 1/8” Carbide Ball 98.07 (10) 588.4 (60) Aluminum, zinc and lead
K 1/8” Carbide Ball 98.07 (10) 1471 (150) Bearing Metals and other very soft or thin materials. Use smallest ball and heaviest load that doesn’t give anvil effect.
L ¼” Carbide Ball 98.07 (10) 588.4 (60)
M ¼” Carbide Ball 98.07 (10) 980.7 (100)
P ¼” Carbide Ball 98.07 (10) 1471 (150)
R ½” Carbide ball 98.07 (10) 588.4 (60)
S ½” Carbide ball 98.07 (10) 980.7 (100)
V ½” Carbide ball 98.07 (10) 980.7 (150)
15N Spheroconical Diamond 29.42 (3) 147.1 (15) Similar to A, C and D scales but for thinner gage material.
30N Spheroconical Diamond 29.42 (3) 294.2 (30)
45N Spheroconical Diamond 29.42 (3) 441.3 (45)
15T 1/16” Carbide Ball 29.42 (3) 147.1 (15) Similar to B, F and G scales but for thinner gage material.
30T 1/16” Carbide Ball 29.42 (3) 294.2 (30)
45T 1/16” Carbide Ball 29.42 (3) 441.3 (45)
15W 1/8” Carbide Ball 29.42 (3) 147.1 (15) Very Soft Material
30W 1/8” Carbide Ball 29.42 (3) 294.2 (30)
45W 1/8” Carbide Ball 29.42 (3) 441.3 (45)
15X ¼” Carbide Ball 29.42 (3) 147.1 (15)
30X ¼” Carbide Ball 29.42 (3) 294.2 (30)
45X ¼” Carbide Ball 29.42 (3) 441.3 (45)
15Y ½” Carbide Ball 29.42 (3) 147.1 (15)
30Y ½” Carbide Ball 29.42 (3) 294.2 (30)
45Y ½” Carbide Ball 29.42 (3) 441.3 (45)

The above tables are from ASTM E 18.
Reprinted from the Annual Book of ASTM Standards, copyright American Society for Testing and Materials.
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