2.2.1 When the drawing calls for a hole without tolerance on the hole dimension, the tolerance block shall apply. 2.2 Hole Diameter Tolerances 2.2.1 When a drawing calls for a hole and specifies the hole diameter and tolerance, the drawing tolerance shall take precedence.
STANDARD TOLERANCE CHART ISO
If general tolerances in accordance with ISO 2768 shall apply, the information shall be indicated in or near the title block, such as ISO 2768-m. The tolerance of the depth of the hole shall be defined on the drawing. General tolerances specified in angular units control only the general orientation of lines or line elements of surfaces, but not their form deviations.ĥ. ASTM E2188 - Standard Test Method for Insulating Glass Unit Performance The tolerances and specifications are strongly considered as general guidelines for acceptability/approval. ASTM C1172 - Standard Specification for Laminated Architectural Flat Glass 6. Keywords: Tolerance chart Manufacturing processes. ASTM C1048 - Standard Specification for Heat-Treated Flat Glass 5. Smaller or larger tolerances should be indicated adjacent to the relevant nominal dimensions.Ĥ. the standard weight (of mass) by a precision manufacturer in. All in all, this standard is just for a general tolerance for machining. When selecting the tolerance class, the respective customary workshop accuracy has to be taken into consideration.ģ. ISO Tolerances For Fasteners ISO Tolerance Chart ISO & Metric Standards. These tolerances may be suitable for use with materials other than metal.Ģ. It does not apply for the following dimensions:Ī) linear and angular dimensions which are covered by reference to other standards on general tolerances ī) auxiliary dimensions indicated in brackets Ĭ) theoretically exact dimensions indicated in rectangular frames.ġ.
unless reference to ISO 2768-2 is made, or angles of uniform polygons Ĭ) linear and angular dimensions produced by machining assembled parts. external sizes, internal sizes, step sizes, diameters, radii, distances, external radii and chamfer heights for broken edges) ī) angular dimensions, including angular dimensions usually not indicated, e.g. ISO 2768 Part 1 only applies to the following dimensions which do not have an individual tolerance indication:Ī) linear dimensions (e.g. It applies to the dimensions of parts that are produced by metal removal or parts that are formed with sheet metal fabrication. ISO 2768 Part 1 is intended to simplify drawing indications and it specifies general tolerances for linear and angular dimensions without individual tolerance indications in four tolerance classes.
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