Interference-Fit Threads Machinery's Handbook, 31st Edition
2107
Internal Thread
Max. Material Stud (Largest Stud)
Max. Material Tapped Hole (Smallest Tapped Hole) Min. Pitch Dia.
External Thread
Max. Major Dia.
Max. Interference
Max. Pitch Dia. Minor Dia.
Min. Minor Dia.
(Design Form)
MAXIMUM INTERFERENCE
Internal Thread
Min. Material Tapped Hole (Largest Tapped Hole)
Min. Material Stud (Smallest Stud)
External Thread
Major Dia.
Max. Pitch Dia.
Min. Pitch Dia.
Min. Interference
Max. Minor Dia.
Min. Minor Dia. __ P 8 MINIMUM INTERFERENCE Note: Plastic flow of interference metal into cavities at major and minor diameters is not illustrated. Maximum and Minimum Material Limits for Class 5 Interference-Fit Thread Design and Application Data for Class 5 Interference-Fit Threads.— Following are con- ditions of usage and inspection on which satisfactory application of products made to dimensions in Table 1, Table 2, and Table 3 are based. Thread Designations: The following thread designations provide a means of distin guishing the American Standard Class 5 Threads from the tentative Class 5 and alternate Class 5 threads, specified in Federal Screw Thread Handbook H28. They also distinguish between external and internal American Standard Class 5 Threads. Class 5 External Threads are designated as follows: NC-5 HF—For driving in hard ferrous material of hardness over 160 BHN. NC-5 CSF—For driving in copper alloy and soft ferrous material of 160 BHN or less. NC-5 ONF—For driving in other nonferrous material (nonferrous materials other than copper alloys), any hardness. Class 5 Internal Threads are designated as follows: NC-5 IF—Entire ferrous material range. NC-5 INF—Entire nonferrous material range.
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