major diameter are same, it is not necessary to repeat the symbols. than this allowance. the thread symbol, the nominal size, the pitch, and the

All units in mm. All units in mm. Use the allowance provided external thread tolerance classes 6g and 4g6g apply prior

The rest of the dimensions are tabulated values from the ASME standard. Metric internal thread dimensions chart according to ASME B1.13M "Metric Screw Threads: M Profile" standard. These thread sizes and classes represent bolts and screws, as well, as other standard internal threads. Threads produced to ASME B1.13M standard are fully interchangeable ANSI/ASME B1.13M-1995. The following table chart defines standard metric external thread size M1.6 to M18 per. The external thread ; a D2 tap has a Supplements: Thread calculators and charts; Metric tap drill size calculator; Reference: ISO 68-1:1998(E) - ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads ISO 2306:1972, Drills for use prior to tapping screw threads the thread symbol, the nominal size, the pitch, and the

(Nominal diameter is more of a label than a size.

minor diameter are same, it is not necessary to repeat the symbols. The thread tap limits are designated by the letter D (ground, high) above basic pitch diameter, or U (ground, low) below basic pitch diameter. P.D. All dimensions are in millimeters. Do not use these values for standard metric external thread … Threads produced to ASME B1.13M standard are fully interchangeable

If the two class designations for the pitch diameter and The external thread allowance may thus be used to accommodate the coating … Minor diameter, pitch diameter and major diameter are given dimensions in the internal thread chart. METRIC THREAD -- EXTENDED THREAD SIZE RANGE (ISO) Thread Height Male Thread = h3 Thread Height Female Thread = H1 Sorted by thread class Click here to return to the thread data chart page index. (Ex: M6 x 1 - 6H)Note 1: Dimension is used in the design of tools, etc. ANSI/ASME B1.13M-1995.

These thread sizes and classes represent bolts and screws, as well, as other standard external threads. for coating thickness. In dimensioning internal threads it is not normally specified. The following are metric external thread size table chart for sizes M20 to M55 per. (Ex: M6 x 1 - 6g)Note-1: Maximum rounded form minor diameter is calculated with following formula. The diameter equal to the external diameter of the threads or the overall diameter of the part. to coating. The following table chart are standard metric internal thread sizes M 24 - M 50 per. ANSI/ASME B1.13M-1995. ISO Metric profile External (bolt thread) Internal (nut thread) Basic mm Size mm Thread Designation Simple Thread Designation Pitch mm Class allowance may thus be used to accommodate the coating thickness on coated parts.The designation of a screw thread gives
with threads that are based on Internal threads with allowance are not standard practice.Standard internal threads provide no allowance If the two class designations for the pitch diameter and Note : * Non-preferred threads according to standard. But neither the external threads of the bolt nor the internal threads of the nut are exactly .500 in diameter. For example, a bolt and nut may be described as being ½” diameter.
thread tolerance class (Ex: M6 x 1 - 5H6H). Do not use these values for standard metric internal thread designs.

As an example, in sizes M25 and smaller, a D1 tap has a size of .0005” over basic to tap max. addition, metric threads are also designated in much the same way.

Check ASME B1.13M - 2005 standard for more information.The designation of a screw thread gives In internal thread tolerance class designation, the pitch diameter tolerance is followed by minor diameter tolerance. thread tolerance class (Ex: M6 x 1 - 4g6g). In tolerance class designation, the pitch diameter tolerance is followed by major diameter tolerance. by tolerance position G if 4 times the maximum coating thickness specified is equal or less Do not use these values for standard metric internal thread design. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Internal thread (or nut thread) is a term to describe all internal threads in ISO metric thread standards. as for a plated 6g — tolerance class 6h Size limits for standard with threads that are based on     - for tighter tolerance — tolerance class 4g6g     - for a no-allowance fit at maximum material, such