ASKER Durometer Type A

The Type A Durometer for general rubber (Normal hardness ) The mainstream product used world-wide for measuring various kinds of rubbers, and specified in the standards of JIS K 6253-3, ASTM D 2240, ISO 48-4, DIN53505, etc.
The Pressure foot in contact with the specimen is 44mm in width and 18mm in depth, wide enough to ensure accurate measurement.
Another type of durometer with an 18mm diameter pressure foot is available. In addition, the Longer Pressure Foot Type (AL Type) is applicable for measurement of narrow or concave specimens.



Type A Durometer (ASKER A type), conforming to JIS K 6253-3 is the most popular type of durometer for measuring rubber hardness.

However, verification is recommended because a significant difference is estimated to be the largest when a durometer indicates measurement values from 10 to 90 points.

For hard specimens for which Type A Durometer readings indicate more than 90 points, measurements should be undertaken using the Type D Durometer (ASKER D type). However, for soft specimens with measurements of less than 20 points, the ASKER C type or Type E Durometer (ASKER E type) should be used. The most important consideration in using durometers is to select the correct type for purposes of measurement according to the specimen.

StandardsJIS K 6253-3
JIS K 7215
ASTM D 2240
ISO 48-4
ISO 868
DIN 53505
Indication range0 point – 100 point (262 degree dial scale)
Minimum indication1 point (Accuracy : ±1 point)
Indentor Design (mm)Height: 2.50 35°Angle Flat Cone Point 0.79 Dia.
Spring Forces [mN(g)]0 point: 550(56)
100 point: 8050(821)
Central hole of diameter of Pressure footΦ3
Pressure foot Dimension (mm)44×18(Rectangular)
Outer Dimension (mm)Approx. Width 57×Depth 30×Height 76
Weight (g)200
Applicationgeneral rubber


Rubber and plastic hardness tester.

The stationary set hand (max-hand) makes the maximum value easier to read and allows the creep characteristics of a specimen.
Accurate measurement is made possible for specimens* for which stress relaxation occurs over time or for specimens for which it is difficult to take readings from the front.
*Materials for which the reading decreases immediately after the indentor has been pressed against the surface.

Constant loarder assures uniform test pressure eliminating false readings due to differences between operators in measuring by hand.
High accuracy and repeatability of the hardness readings are assured by the flexible joint function.

The gauge to check the indentor height on a durometer and the reading indicator mechanism.
Inspection is conducted at 2, 50, and 100 points respectively.

Tester to check load properties of the spring on a durometer
Inspection is conducted at 25, 50, and 75 points respectively.

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