CSDA has adopted the International Association of Concrete Drillers & Sawers (IACDS) Tolerance Standard that was developed through the cooperation of sawing and drilling associations from Austria, Germany, Italy, Japan, Sweden, Switzerland, the United Kingdom and the United States.

The IACDS Tolerance Standard consists of nine sections that cover reasons for issuing tolerances, definitions, and maximum tolerances for each sawing and drilling discipline, including core drilling, flat sawing, wall sawing and wire sawing. Also covered in this Standard are maximum tolerances for crushing and bursting. “The Standard is intended to separate the amateur from the professional,” said Kaspar Disch of Switzerland, who was instrumental in the development of this Standard.

The tolerances for each discipline are defined by eight separate measurements including angle accuracy, directional accuracy, verticality, horizontal level, surface roughing, section width pocket hole depth or joint and evenness. The IACDS Tolerance Standard is available on both the IACDS Web site ( and the CSDA Web site (

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