TYPE

Main spring travel

INDENTER DESCRIPTION

INDENTER
IMAGE

APPLICATIONS

A
ASTM D2240
JIS K6253
ISO 868

8.05N

Truncated Cone
35° Included Angle

Soft rubber, elastomers,

neoprene,silicone, vinyl,

nitrile, and butyl,
soft plastics, felt, leather,
waxes, printing rollers
and similar materials

B
ASTM D2240

8.05N

Conical
30° Included Angle

Rubber, elastomers,
use when off the high
end of the A scale

C
ASTM D2240

44.5N

Truncated Cone
35° Included Angle

Medium hard
rubber or plastics
use when off the
low end of the D scale

D
ASTM D2240
JIS K6253
ISO 868

44.5N

Conical
30° Included Angle

Hard rubber, plastics,

acrylic,delrin, kevlar, pvc,

nylon,lexan, epoxies and

similar materials

DO
ASTM D2240

44.5N

3/32" Spherical
Diameter
(2.38mm)

Dense textile
winding, medium
printing rollers

O
ASTM D2240

8.05N

3/32" Spherical
Diameter
(2.38mm)

Soft printing rollers,
textile windings

OO
ASTM D2240

1.11N

3/32" Spherical
Diameter
(2.38mm)

Sponge rubber,
very soft rubber

OOO
ASTM D2240

1.11N

1/2" Spherical
Diameter
(12.7mm)

Very soft materials,

(e.g.) open cell foam