TABLE OF CONTENTS Surface Texture Symbols. The symbol used to designate control of surface irregularities is shown in Fig. 1a. Where surface texture values other than roughness average are specified, the symbol must be drawn with the horizontal extension as shown in Fig.1e.
| Symbol | Meaning |
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 Figure 1a | Basic Surface Texture Symbol. Surface may be produced by any method except when the bar or circle (Fig. 1b or 1d) is specified. |
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 Figure 1b | Material Removal By Machining Is Required. The horizontal bar indicates that material removal by machining is required to produce the surface and that material must be provided for that purpose. |
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 Figure 1c | Material Removal Allowance. The number indicates the amount of stock to be removed by machining in millimeters (or inches). Tolerances may be added to the basic value shown or in a general note. |
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 Figure 1d | Material Removal Prohibited. The circle in the vee indicates that the surface must be produced by processes such as casting, forging, hot finishing, cold finishing, die casting, powder metallurgy or injection molding without subsequent removal of material. |
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 Figure 1e | Surface Texture Symbol. To be used when any surface characteristics are specified above the horizontal line or the right of the symbol. Surface may be produced by any method except when the bar or circle (Fig. 1b and 1d) is specified. |
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 Figure 1f |
Use of Surface Texture Symbols: When required from a functional standpoint, the desired surface characteristics should be specified. Where no surface texture...
