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ISO 4759-1 Tolerances for fasteners – Part 1: Bolts, screws, studs and nuts ...
June 2002
D EUTSCHE NORM
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Nuts for T-slots
508 Supersedes January 1997 edition.
ICS 21.060.20 Muttern für T-Nuten
In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker.
Foreword This standard has been prepared by the Normenausschuss Werkzeuge und Spannzeuge (Tools and Clamping Devices Standards Committee), Technical Committee Bohrbuchsen, Spannzeuge und Vorrichtungen. Amendments This standard differs from the January 1997 edition in that marking details have been changed and the standard has been editorially revised. Previous editions DIN 508: 1924-01, 1928-01, 1956-05, 1969-10, 1977-06, 1979-02, 1991-04, 1997-01.
Introduction This standard conforms in substance to International Standard ISO 299 : 1987. In conjunction with DIN 6379 studs, nuts for T-slots form clamping elements similar in function to the T-head bolts specified in DIN 787. DIN 267-4 (withdrawn), upon which the April 1991 edition of this standard was based, was superseded by DIN EN 20898-2. However, neither the property classes specified in the latter standard nor the hardness classes specified in DIN 267-24 apply because the T-nuts specified here are not compatible with conventional nuts. Instead, T-nuts as specified in this standard shall be subjected to tensile testing using the proof loads specified in table 1 (cf. figure 2). To utilize the bearing capacity of T-nuts, full-length engagement of the stud is essential. It should be noted that, when determining the bearing capacity of the assembly, allowance must be made for the reduced wall thickness of the shank.
Continued on pages 2 to 4.
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 the prior permission of DIN Deutsches Institut für Normung e.V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, has the exclusive right of sale for German Standards (DIN-Normen).
Ref. No. DIN 508 : 2002-06 English price group 06
Sales No. 0006 01.03
Page 2 DIN 508 : 2002-06 All dimensions are in millimetres.
1
Scope
This standard specifies nuts for T-slots, which are elements for use with DIN 6379 studs, for mounting workpieces or fixtures in T-slots as specified in DIN 650 on machine tool tables, workholding plates, and in workholding fixtures and toolholders.
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 applies. DIN 267-4 DIN 267-24 DIN 650 DIN 787 DIN 6379 DIN EN 20898-2 ISO 299 : 1987 ISO 2768-1 : 1989 DIN EN ISO 4759-1
3
Fasteners – Technical delivery conditions – Property classes for nuts (previous classes) Fasteners – Technical delivery conditions – Property classes for nuts Dimensions of T-slots for machine tool tables T-head bolts Studs for use with T-nuts Mechanical properties of fasteners – Part 2: Nuts with specified proof load values – Coarse thread (ISO 898-2 : 1992) Machine tool tables – T-slots and corresponding bolts General tolerances – Part 1: Tolerances for linear and angular dimensions without individual tolerance indications Tolerances for fasteners – Part 1: Bolts, screws, studs and nuts – Product grades A, B and C (ISO 4759-1 : 2000)
Dimensions, proof loads and designation
Nuts for T-slots shall have dimensions and resist proof loads as specified in table 1 (cf. figures 1 and 2). Design details not given here remain unspecified. For general tolerances, tolerance class m as specified in ISO 2768-1 shall apply.
Figure 1: T-nuts
Page 3 DIN 508 : 2002-06
a)
Slot dimensions as in DIN 650. Figure 2: Tensile testing of nuts for T-slots
Designation of an M16 nut for T-slots with a equal to 18 mm:
Nut DIN 508 – M16 é 18 Table 1: Dimensions and proof loads
Limit deviations
4 4.1
Limit deviations
Approx. Size of Proof load, mass T-slot F min, Limit per unit, as in in deviain g DIN 650 103 N tions
Material and hardness Material
The steel used for nuts for T-slots shall be at the manufacturer’s discretion.
4.2
Hardness
Size M4 nuts shall have a Vickers hardness of 170 HV or greater, size M5 up to M36 nuts, a hardness of 188 HV or greater, and nuts of sizes greater than M36 shall have a hardness of 180 HV or greater.
Page 4 DIN 508 : 2002-06
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Tolerances
Nuts for T-slots shall be manufactured in product grade A in accordance with DIN EN ISO 4759-1.
6
Marking
As a rule, nuts shall be marked with the DIN symbol in a durable manner. The marking shall be easy to read. If marking is not possible for lack of space, the smallest commercially available packaging unit shall bear the marking.
Other relevant standard DIN 6330
Metric hexagon nuts 1,5 d high
