ISO INTERNATIONAL STANDARD 4579 First edition 2021-11 Aerospace Drives, internal, ToRX? PARALOBE? drive Geometrical definition, gaging and technical requirements Aeronautique et espace-Empreintes, TORX PARALOBE? entrainement -Définition géométrique, calibrage et exigences techniques Reference number ISO 4579:2021(E) ISO @IS02021 IS0 4579:2021(E) COPYRIGHT PROTECTED DOCUMENT @ IS02021 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, withoutpriorwrittenpermission.Permission can berequestedfrom eitherIso at theaddress below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2021 - All rights reserved