The information you are looking for is usually found with the application notes of the component you are mounting to the heatsink. If the manufacturer of the component is short on information, but the package is standard, Motorola has good information. Find a MOT part that is in the same package and look up the app notes. For small parts like TO220 through hole 6 inch pounds rings a bell . . . but you know the old saying, in God we trust all others bring data. Hey if Bill Baltus is still around say hi to him for me. We visited your place last March. I can't ever thank him enough. Subject: Heaksink attachment: torque standards Date: Mon, 20 Dec 1999 13:32:39 -0600 From: Jason Miller <[log in to unmask]> The IPC-A-610 went to the extent of defining heatsink acceptability requirements such that "hardware meets mounting torque requirements if specified." Due to past problems, we are going to verify heatsinks withstand a certain amount of torque. Does anyone know of a recommended/benchmark torque heatsinks should be able to withstand? Our particular heatsink is about 1" x 1", .25" tall. We have been using Loctite 383. Jason Miller K-Byte Hibbing Manufacturing ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################