Thread undercut DIN 76 – B Table 1: Dimensions of thread run-outs and thread undercuts for external threads Thread run-out DIN 76-1 : 2004-06 Designation of a type B thread undercut (B): Type A, with g1 and g2 of normal design Type B, with g1 and g2 of short designįigure 3: Thread undercut dimensions (notation) It should be noted that fasteners with thread undercut do not meet the requirements for minimum breaking load as specified in DIN EN ISO 898-1 or minimum breaking torque as specified in DIN EN 28839.
#Tabella gola uni iso 4755 full#
Key to figure 1 Shank diameter R pitch diameter Figure 1: Thread run-out dimensions (notation)ĭistance from last full form thread to bearing face, a (for fully threaded components)įigure 2: Dimension a (notation) 3.1.3 Thread undercuts Thread undercut dimensions shall be as given in figure 3 and table 1. Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1: Bolts, screws and studs (ISO 898-1 : 1999) ISO general purpose metric screw threads – General plan (ISO 261 : 1998) Thread run-outs for fasteners with thread in accordance with ISO 261 and ISO 262 Fasteners – Thread undercuts for external metric ISO threadsģ.1.1 Thread run-outs Thread run-out dimensions shall be as given in figures 1 and 2 and table 1. Beuth Verlag GmbH, 10772 Berlin, Germany, has the exclusive right of sale for German Standards (DIN-Normen). © No part of this translation may be reproduced without the prior permission of DIN Deutsches Institut für Normung e. In case of doubt, the German-language original should be consulted as the authoritative text. General purpose ISO metric screw threads – Nominal sizes for 1 mm to 68 mm diameter coarse pitch threads Thread run-outs and thread undercuts for pipe threads conforming to ISO 228-1 Thread run-outs and thread undercuts for trapezoidal threads, buttress threads, knuckle threads and other coarse pitch threads Mechanical properties of fasteners – Bolts, screws, studs and nuts made of non-ferrous metals (ISO 8839 : 1986) Document comprises 5 pages. For undated references, the latest edition of the publication referred to applies. 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. These normative references are cited at the appropriate places in the text, and the titles of the publications are listed below. This standard incorporates, by dated or undated reference, provisions from other publications.
This standard specifies dimensions for thread run-outs and thread undercuts for bolts, screws and similar components with external or internal ISO metric (coarse or fine pitch) thread as in DIN 13-1 and DIN ISO 261. Amendments This standard differs from the December 1983 edition in that it has been editorially revised.Ī&I-Normenabonnement - DaimlerChrysler AG - Kd.-Nr.2112003 - Abo-Nr.00028584/002/001 - 07:41:41 It should be noted that ISO 3508 and ISO 4755 do not contain specifications for thread run-outs and thread undercuts for internal threads. Type B thread undercuts are intended for use on a case-by-case basis, where required for technical reasons the use of special tools is necessary here. type A with g2 max = 3,5 P (normal design) and type B with g2 max = 2,5 P (short design).
As a departure from ISO 4755, which specifies only one type of thread undercut with g2 max = 3 P, this standard specifies two types, i.e. It is based on International Standards ISO 3508 : 1976 and ISO 4755 : 1983. 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.įoreword This standard has been prepared by Technical Committee Fachgrundnormen of the Normenausschuss Mechanische Verbindungselemente (Fasteners Standards Committee). ICS 21.040.10 Gewindeausläufe und Gewindefreistiche – Teil 1: Für Metrisches ISO-Gewinde nach DIN 13-1 Thread run-outs and thread undercuts for ISO metric threads as in DIN 13-1
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