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The limit dimensions for standard threads given in the table correspond to the - tolerance field 6g for bolt threads - tolerance field 6H for nut threads. The metric steel / metal threads specified in this catalog are based on these tolerance fields.
10.5 DIN 13 ISO Metric threads ISO Metric threads – DIN 13 (Thread limits for standard engagement lengths to UNI 5545-65) Nominal thread-Ø Gra-dient P Screw with tolerance of 6g Nut screw with tolerance of 6H Ø major d Ø pitch d 2 Ø minor d 1 Ø major D Ø pitch D Ø minor D max. min. max. min. max. min. min. max. min. max. min. max.
The main document for ISO Metric Threads: * List and definition of symbols. * Tolerance classes definition. * Designation rules. * Allowance Chart – Per class and pitch. * Normal Length of Engagement Chart – Per diameter and pitch. * Tolerance fields Charts – Per diameter and pitch. * Root radius Charts and formulas.
ISO METRIC THREADS - DIN 13 (thread limits) P (mm) Screw with tolerance of 6g Nut screw with tolerance of 6H Ø major d Ø pitch d2 Ø minor d1 Ø major D Ø pitch D2 Ø minor D1 max. min. max. min. max. min. min. max. min. max. min. max. M3 0.5 2.980 2.874 2.655 2.580 2.367 2.273 3.000 2.675 2.775 2.459 2.599
The metric ISO standard thread is standardized according to the DIN 13-1 standard, which covers standard threads with an outer diameter of 1 to 68 mm. This standard was first defined back in 1949, but has been revised and updated many times since then.
The metric steel and metal threads specified in this catalogue are based on the tolerance fields given above. For threads in plastic standard parts (without steel or metallic thread insert) this tolerances can as a rule not be maintained for production-orientated reasons. Page 1134 | Technical information.
ISO 724 - ISO general-purpose metric screw threads - Basic dimensions (DIN 13), the standard in Europe, is recognizable by its cylindrical outer and inner diameter and its precise outer diameter in millimeters. Thread Dimensional Data. d = Basic Nominal Diameter.