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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.
– Metric screw thread, fine series, are designated by the basic diameter, preceded by the profile letter M and followed by the pitch separated by an x-mark and then by the tolerance grade, e.g. 6, and the tolerance position, e.g. H. Example: M10 x 1,25 – 6H.
having to the tolerances for the period in which the threads are still in use, they have modified to conform to the ISO standard. The tolerances below have t*en taken from the January 1952 of D IN 13 Part 15.
This part of ISO 965 specifies a tolerance system for ISO general purpose metric screw threads (M) according to ISO 261. The tolerance system refers to the basic profile according to ISO 68-1.
ISO 965-1 - ISO general purpose metric screw threads -- Tolerances -- Part 1: Principles and basic data. Location tolerance zones relative to the zero line (nominal size) Basic tolerances for internal and external threads. Pitch P.
ISO quality IT8 (i.e. P8 instead of P9, N8 instead of N9 and IS8 instead of IS9) are recommended for the width of broached slots. Tolerance H9 for the shaft slot and D10 for the hub slot are recommended for sliding fits. Squares for Operating Spindles and Operating Parts to.
