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| − | =Typical Industry Tangent Point Tolerances=
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| − | <table cellpadding=10>
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| − | <tr valign=top>
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| − | <td width=500>
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| − | In working with thousands of customers over the past few decades, we've seen some trends in accepted envelope deviation tolerances. Here are what we commonly see:
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| − | ====Aerospace and Automative Fluid Lines====
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| − | <table cellpadding=10 width=400>
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| − | <tr>
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| − | <td bgcolor=#9999CC>
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| − | Diameter Range
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| − | </td>
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| − | <td bgcolor=#CCCCFF width=200>
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| − | Envelope Tolerance
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| − | </td>
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| − | </tr>
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| − | <tr>
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| − | <td>
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| − | 12.7 mm (0.5 inch) diameter tubes or less
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| − | </td>
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| − | <td>
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| − | +/- 1 mm (0.039 inches)
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| − | </td>
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| − | </tr>
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| − | <tr>
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| − | <td>
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| − | Greater than 12.7 mm (0.5 inch)
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| − | </td>
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| − | <td>
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| − | +/- 2 mm (0.078 inches)
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| − | </td>
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| − | </tr>
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| − | </table>
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| − |
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| − | ====Automotive Exhaust Pipes====
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| − | <table cellpadding=10 width=400>
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| − | <tr>
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| − | <td bgcolor=#9999CC>
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| − | Diameter Range
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| − | </td>
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| − | <td bgcolor=#CCCCFF width=200>
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| − | Envelope Tolerance
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| − | </td>
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| − | </tr>
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| − | <tr>
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| − | <td>
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| − | 50 mm to 76 mm
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| − | </td>
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| − | <td>
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| − | From +/- 2 mm to +/- 3 mm
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| − | </td>
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| − | </tr>
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| − | <tr>
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| − | <td>
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| − | 76 mm to 102 mm
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| − | </td>
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| − | <td>
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| − | +/- 3 mm
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| − | </td>
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| − | </tr>
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| − | <tr>
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| − | <td>
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| − | Larger then 102 mm
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| − | </td>
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| − | <td>
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| − | +/- 3 mm or greater
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| − | </td>
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| − | </tr>
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| − | </table>
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| − | ====Shipbuilding====
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| − | <table cellpadding=10 width=400>
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| − | <tr>
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| − | <td bgcolor=#9999CC>
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| − | Diameter Range
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| − | </td>
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| − | <td bgcolor=#CCCCFF width=200>
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| − | Envelope Tolerance
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| − | </td>
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| − | </tr>
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| − |
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| − | <tr>
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| − | <td>
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| − | All Diameters
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| − | </td>
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| − | <td>
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| − | +/- 6 mm
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| − | </td>
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| − | </tr>
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| − |
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| − | </table>
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| − |
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| − |
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| − | ====HVAC====
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| − | <table cellpadding=10 width=400>
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| − | <tr>
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| − | <td bgcolor=#9999CC>
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| − | Diameter Range
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| − | </td>
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| − | <td bgcolor=#CCCCFF width=200>
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| − | Envelope Tolerance
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| − | </td>
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| − | </tr>
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| − |
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| − | <tr>
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| − | <td>
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| − | All Diameters
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| − | </td>
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| − | <td>
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| − | +/- 2 to +/- 3 mm
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| − | </td>
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| − | </tr>
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| − |
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| − | </table>
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| − |
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| − | ====Structural Tubes (Frames)====
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| − | <table cellpadding=10 width=400>
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| − | <tr>
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| − | <td bgcolor=#9999CC>
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| − | Diameter Range
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| − | </td>
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| − | <td bgcolor=#CCCCFF width=200>
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| − | Envelope Tolerance
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| − | </td>
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| − | </tr>
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| − |
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| − | <tr>
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| − | <td>
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| − | All Diameters
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| − | </td>
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| − | <td>
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| − | +/- 2 to +/- 3 mm
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| − | </td>
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| − | </tr>
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| − |
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| − | </table>
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| − |
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| − | ====Tighter Tolerances====
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| − | Sometimes customers will required +/-0.75 mm - but this is very rare. We've never seen tube shapes that must be qualified with a deviation tolerance of less than +/- 0.75 mm.
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| − |
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| − | </td>
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| − | <td width=300>
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| − | [[image:aerospace_envelope_tolerance.png|400px]]<br>
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| − | [[image:exhaust_envelope_tolerance.png|400px]]<br>
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| − | [[image:shipbuilding_envelope_tolerance.png|400px]]<br>
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| − | </td>
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| − | </tr>
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| − | </table>
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| | =Other Pages= | | =Other Pages= |
