PH Tool 4-Step Block

The PH Tool 4-Step Block is used for thickness and linearity calibration. This 4-Step block comes in thicknesses of .250”, .500”, .750” and 1.000”, with step face measuring .750″ x .750″. Two metric versions are also available.  This test block is in accordance with ASTM E797.

Available in aluminum, steel, stainless steel and special alloy. Variations of this block are also available.

Contact us for pricing and to place your order.



Standard test blocks are non-representative tools, meaning that they are not manufactured from actual parts. Rather, they are a simplified design that contains manufactured discontinuities such as holes, angles, radii and more. Standard test blocks serve the purpose of standardizing and calibrating test equipment to ensure it is functioning properly.

All test blocks ship with a NIST-traceable certification report stating that the block meets applicable specifications.

Optional fitted, wooden storage case also available.

Additional information

Calibration Block

Imperial Aluminum, Imperial 1018 Steel, Imperial Stainless Steel, Imperial Special Alloy, Metric Aluminum 4A, Metric 1018 Steel 4A, Metric Stainless Steel 4A, Metric Special Alloy 4A, Metric Aluminum 4B, Metric 1018 Steel 4B, Metric Stainless Steel 4B, Metric Special Alloy 4B


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