L1 = Length of normal hand-tight engagement. This is also the L1 gauge length. (Longer thread engagement may be used in special applications, such as flanges for high pressure use. In such cases the pitch diameter, E, remains as specified and the diameter at the end of the pipe is proportionally smaller.)

Tolerances When using L1 gauges to check threads, the thread is within permissible tolerance if the ring gauge face, or plug gauge notch, is +/- 1 turn from being flush with the end of the thread.

In general, use inserts with a large entering angle (round inserts) and select a positive insert geometry. In turning and milling, ceramic grades can be used, ...

Note: Basic dimensions are given to four or five decimal places to eliminate errors when calculating gauge dimensions, they do not imply a greater degree of precisions than is normally obtainable. Metric dimensions, where shown, are calculated from the inch values and rounded.

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This article will concentrate on the industrial hardening of steel, which is carried out using one of three main techniques.

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Adheres to standards specified by the O-ring division of Parker Hannifin CorporationApplicationsUsed for milling half or full O-ring dovetail grooves ...

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L2 = Effective length of thread = Truncation from point of thread triangle to flat (not shown in diagram). Minimum = 0.033P for all pitches. See table for maximum.

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