DEUTSCHE NORM August 2005
DIN 13-26{ ICS 21.040.10
Supersedes
DIN 13-26:1983-10
General purpose ISO metric screw threads –
Part 26: Limits of sizes for fine pitch threads with preferred tolerance classes – Nominal thread diameters of 252 mm to 1 000 mm
Metrisches ISO-Gewinde allgemeiner Anwendung –
Teil 26: Grenzmaße für Feingewinde mit bevorzugten Toleranzklassen –
Gewinde-Nenndurchmesser von 252 mm bis 1 000 mm
Document comprises 18 pages
Translation by DIN-Sprachendienst.
In case of doubt, the German-language original should be consulted as the authoritative text.
©  No part of this translation may be reproduced without prior permission of
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DIN 13-26:2005-08
Contents Page
Foreword (2)
1Scope (3)
2Normative references (3)
3Terms and definitions (4)
4Limits of size (4)
Figures
Figure 1 — Internal thread with tolerance position H (4)
Figure 2 — External thread with tolerance position h (5)
Figure 3 — External thread with tolerance position g (5)
Tables
Table 1 — Limits of size (6)
Foreword
This standard has been prepared by Section B Gewinde of the Normenausschuss Technische Grundla
gen (Fundamental Technical Standards Committee). It is an editorially revised edition of DIN 13-26:1983-10, with the normative references updated and the designations modified in form, but not in substance, to conform with standard terminology (see Amendments).
Amendments
The following amendments have been made to DIN 13-26:1983-10:
a) the title of the standard is now more precise;
b) in the German edition of this standard, the following terminology has been modified. The first two terms
have also been changed in the English translation:
⎯Innengewinde (internal thread) replaces Muttergewinde (nut thread),
⎯Außengewinde (external thread) replaces Bolzengewinde (bolt thread),
⎯Mindestmaß (minimum limit of size) replaces Kleinstmaß,
⎯Höchstmaß (maximum limit of size) replaces Größtmaß,
⎯Toleranzklasse (tolerance class) replaces Toleranzfeld;
2
DIN 13-26:2005-08
c) the normative references have been updated;
d) the standard has been editorially revised,
Previous editions
DIN 13-26:1973-02, 1983-10
1 Scope
This standard applies for ISO general purpose screw threads with a basic profile as in DIN ISO 68-1. It sets out limits of size for fine pitch threads with nominal thread diameters of 252 mm to 1000 mm, with preferred tolerance classes.
2 Normative references
This standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to (including any amendments) applies.
DIN 13-6, General purpose ISO metric screw threads ⎯ Part 6: Nominal sizes for 1,5 mm fine pitch threads with diameters from 12 mm to 300 mm
DIN 13-7, General purpose ISO metric screw threads ⎯ Part 7: Nominal sizes for 2 mm fine pitch threads with diameters from 17 mm to 300 mm
DIN 13-8, General purpose ISO metric screw threads ⎯ Part 8: Nominal sizes for 3 mm fine pitch threads with diameters from 28 mm to 300 mm
DIN 13-9, ISO general purpose metric screw threads ⎯ Part 9: Nominal sizes for 4 mm fine pitch threads with nominal diameter from 40 mm to 300 mm
DIN 13-10, General purpose ISO metric screw threads ⎯ Part 10: Nominal sizes for 6 mm fine pitch threads with diameters from 70 mm to 500 mm
DIN 13-11, General purpose ISO metric screw threads ⎯ Part 11: Nominal sizes for 8 mm fine pitch threads with diameters from 130 mm to 1 000 mm
DIN 2244, Screw threads ⎯ Terms and screw thread elements for parallel screw threads
DIN ISO 68-1, ISO general purpose screw threads ⎯ Basic profile ⎯ Part 1: Metric screw threads
DIN ISO 965-1, ISO general purpose metric screw threads ⎯ Tolerances ⎯ Part 1: Principles and basic data DIN ISO 965-3, ISO general purpose metric screw threads ⎯ Tolerances ⎯ Part 3: Deviations for constructional screw threads
3
DIN 13-26:2005-08
4
3 Terms and definitions
For the purpose of this standard, the terms and definitions used in DIN 2244 shall apply *).
4 Limits of size
The limits of size for fine pitch threads with preferred tolerance classes (cf. DIN ISO 965-1) have been calculated on the basis of the nominal dimensions as in DIN 13-6 to DIN 13-11, applying the limit deviations and tolerances as in DIN ISO 965-1. Limits of size for threads with tolerance classes not covered in this standard may be calculated using the limit deviations as in DIN ISO 965-3
The limits for the root radius of the external thread are specified in DIN ISO 965-1 as R  = 0,144 34 P  = H /6 for the maximum limit of size and R min  = 0,125 P ≈ H /7 for the minimum limit of size of the minor diameter d 3
.
Key
D  Nominal thread diameter, major diameter
D 1 Minor
diameter D 2 Pitch
diameter a  Minimum limit of size b
Maximum limit of size
Figure 1 — Internal thread with tolerance position H
*)
editoriallyTranslator's note: Standard only available in German.
DIN 13-26:2005-08
5
Key
d  Nominal thread diameter, major diameter
d 2 Pitch
diameter d 3 Minor
diameter a  Minimum limit of size b
Maximum limit of size
Figure 2 — External thread with tolerance position h
Key
d  Nominal thread diameter, major diameter
d 2 Pitch diameter
d 3 Minor
diameter a  Minimum limit of size b
Maximum limit of size
Figure 3 — External thread with tolerance position g

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