ASME Y14.100:2004 pdf download.Engineering Drawing Practices.
4.30 In-House PecuLiar Information
Design activity identifying numbers may be indicated in brackeLs, I L to identify in-house peculiar identities Engineering drawings and part lists using bracketed identification shall carry a note thereon indicating bracketed identities are for in-house information only.
NOTE: Documents identified as bracketed in1omation are not consdend reisrenced docunwnts as defined heres and therefote are not conasdered part ol Ihe englIwerIn drawlnR. data, or desgn paisgr.
4.31 Use .1 Specifications and Standards
When applicable specifications and standards do not completely fulfill the design requirements of the item. engineering drawings may specify the requirements of the specifications and standards and the variations necessary to fulfill the design requirements of the item, in lieu ol preparing new documentation.
4.32 Metric Practices
4.32.1 Metric Designs. The measurement system In which the part, item, or any of its features is designed shall be used in the documentation for that part. item, or feature. it may be nece’ssarv for any one drawing or assodated document to contain both metric units and inch-pound units to accommodate the interfacing of items. When a document contains some features in rounded, rational metric units and other features in rounded, rational inch-pound units, each measurement shall be appropriately labeled with the applicable measurement unit; or, a general note shall Lw used for the most predominant unit, and other measurement system units shall h clearly marked on the appmpriate incasurement
4.32.2 Metrics. Metric units, practices. and uses for the documentation shall be in accordance with the International System of Units (SI), in accordance with ASTM E 380 and IEEE 268.
4.32.3 Soft Conversion. Soft conversion should not be used on drawings. Soft conversion is the pmcess of changing inch-pound measurement units to equivalent metric units, or vice versa, within acceptable measurement tolerances without changing the physical configuration.
Design activity identifying numbers may be indicated in brackeLs, I L to identify in-house peculiar identities Engineering drawings and part lists using bracketed identification shall carry a note thereon indicating bracketed identities are for in-house information only.
NOTE: Documents identified as bracketed in1omation are not consdend reisrenced docunwnts as defined heres and therefote are not conasdered part ol Ihe englIwerIn drawlnR. data, or desgn paisgr.
4.31 Use .1 Specifications and Standards
When applicable specifications and standards do not completely fulfill the design requirements of the item. engineering drawings may specify the requirements of the specifications and standards and the variations necessary to fulfill the design requirements of the item, in lieu ol preparing new documentation.
4.32 Metric Practices
4.32.1 Metric Designs. The measurement system In which the part, item, or any of its features is designed shall be used in the documentation for that part. item, or feature. it may be nece’ssarv for any one drawing or assodated document to contain both metric units and inch-pound units to accommodate the interfacing of items. When a document contains some features in rounded, rational metric units and other features in rounded, rational inch-pound units, each measurement shall be appropriately labeled with the applicable measurement unit; or, a general note shall Lw used for the most predominant unit, and other measurement system units shall h clearly marked on the appmpriate incasurement
4.32.2 Metrics. Metric units, practices. and uses for the documentation shall be in accordance with the International System of Units (SI), in accordance with ASTM E 380 and IEEE 268.
4.32.3 Soft Conversion. Soft conversion should not be used on drawings. Soft conversion is the pmcess of changing inch-pound measurement units to equivalent metric units, or vice versa, within acceptable measurement tolerances without changing the physical configuration.
