ISO INTERNATIONAL STANDARD 18669-2 Second edition 2020-04 Internal combustion engines - Piston pins - Part 2: Inspection measuring principles Moteurs d combustion interne-Axes de pistons- Partie 2: Principes de mesure pour le controle Reference number IS0 18669-2:2020(E) ISO @ISO 2020 IS018669-2:2020(E) COPYRIGHTPROTECTEDDOCUMENT ISO2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or IsO's member body in the country of the requester: ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122.749 0111 Fax: +41 22 749 09 47 Email:copyright@iso.org Website: www.iso.org Published in Switzerland ii IS02020-Allrights reserved IS018669-2:2020(E) Contents Page Foreword iv 1 Scope .1 2 Normativereferences. .1 3 Terms and definitions. .2 4 Measuring principles. 4 4.1 General measuring conditions. 4 4.2 Characteristics and measuringprinciples 4 4.2.1 Outside diameter, di 45 4.2.2 Cylindricity of theoutside diameter (d) 4.2.3 Circularityoftheoutsidediameter (d,) 5 4.2.4 Circumferential waviness. 6 4.2.5 Edge drop-off, b, c. .6 4.2.6 Inside diameter, d2, d 66 4.2.7 Concentricity of inside diameter (ID) relative to outside diameter (OD) 4.2.8 Length, l, 4.2.9 Gauge length, Is 4.2.10 Runoutoftheendfaces,s. 4.2.11 End face concavity, hi, and end face step, h2 8 4.2.12 End face diameter, d 8:8 4.2.13 Outside-edge profile 4.2.14 Inside chamfer, t.. 9 4.2.15 Tapered bore diameter, d3 66 4.2.16 Tapered bore angle, α. 4.2.17 Runout tapered bore, e 9 4.2.18 Roughness 9 4.2.19 Carburised and nitrided case depth 10 4.2.20 Core hardness. 10 4.2.21 Peripheral surface hardness. 10 4.2.22 Volume change 11 4.2.23 Material defects 11 4.2.24 Residual magnetism .12 4.2.25 Visualdefects .13 4.2.26 Grinder burn .13 4.2.27 Streaks on bore surface 13 Bibliography 14 @ IS0 2020 - All rights reserved iii