(CHART IV): TAP DRILL FORMULA FOR METRIC THREADS; NOMINAL OD OF THREAD (MAJOR DIAMETER) - PITCH = TAP DRILL SIZE. (Note: This formula will yield approximately 68% - 77% of thread.) Example: TO FIND THE TAP DRILL SIZE FOR AN M10 x 1.5 THREAD. 10 (OD) - 1.5 (PITCH) = 8.5 mm (TAP DRILL SIZE). The following table chart defines standard metric external thread size M1.6 to M18 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. The following are metric external thread size table chart for sizes M 140 to M 175 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. SThe following table chart are standard metric external thread sizes M 0.25 - M 1.4 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. sized in metric units ☙ See also: thread classes for bolts sized in inches. Tolerance class is designated by tolerance grades and tolerance positions. The tolerance grade is described by a numeral, from 3 to 9 for external threads and 4 to 8 for internal threads. The higher the number the greater the tolerance. A class of thread fit Metric Screw Thread Chart Metric Tap Size Tap Drill (Inches) Clearance Drill (Inches) Standard Screw Thread Chart Standard Thread Size Tap Drill Size (Inches) Clearance Drill Size (Inches) The values listed in the chart above are the recommended values for a class 2 thread fit.

Standard External Metric Thread and Fastener Sizes M 0.25 - M 1.4; Metric External Table Chart Thread Sizes M 20 - M 55; Metric External Table Chart Thread Sizes M 56 - M 78 ; Metric External Table Chart Thread Sizes M 80 - M 100 ; Metric External Table Chart Thread Sizes M 105 - M 135; Metric External Table Chart Thread Sizes M 140 to M 175

The following table chart defines standard metric external thread size M1.6 to M18 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. The following are metric external thread size table chart for sizes M 140 to M 175 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads.

Basically the METRIC hole threads stay the same for all mating screws that fit. The class of the METRIC screw determines how tight or loose the fit 

to identify an unknown thread, certain tools and data are necessary. included in these charts are a helpful compilation of the data needed for the identification of most external (male) threads from the three most popular thread systems in the world, metric standards, u.s.a.(inch) standards, and the british (inch) standards.

The illustration below show the tolerance of the metric screw threads. Other available thread tolerances: 5g6g: For DIN 912 or ISO 4762 Property class 12.9 socket 

ISO Metric thread is a globally standardized thread. Compared to 3A (external) & 3B (internal): for applications where closeness of fit and/or accuracy of thread BSP (BSPP &. BSPT). Metric fine. NPT. UN/JIC/SAE. (Thread class 2). 8,54. 27.

Metric Screw Thread Chart. Metric Tap Size Tap The values listed in the chart above are the recommended values for a class 2 thread fit. The clearance drill 

001” over basic, (see chart 1A on this page). In addition, metric threads are also designated in much the same way. The thread tap limits are designated by the  For instance, a 5G tolerance would signify a tolerance that is in the 5th tolerance class of band G. Screw threads are usually signified by two tolerances, one for  Class fit: 5. Specification of Metric Threads: 6. Local Notes (callouts). 8. Counterbore Appendix C Bolt Grade Markings and Strength Chart. 29. Appendix D  The illustration below show the tolerance of the metric screw threads. Other available thread tolerances: 5g6g: For DIN 912 or ISO 4762 Property class 12.9 socket  In custom use, thread size, pitch and tolerance classes can be independently on Metric screw threads including thread form, definitions, limits and fits for  Class of fit comparative chart between Unified & Metric threads. Those letters represent the class of fit for inch size internal and external Unified screw threads. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Do not use these values for standard metric internal thread 

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