SAE J2486:2018 pdf free

SAE J2486:2018 pdf free.Tension Indicating Washer Tightening Method for Fasteners
Handling and Storage of Fasteners- Particularly when torque measurement is to be used to control tightening，it is imperative that fasteners be protected from shop dust, direct, moisture, and other environmental factors. It is recommended that fasteners remain in protective storage until their imminent use.Both plain finish and coated fasteners are susceptible to surface corrosion, even when exposure is limited to conditions inside a typical warehouse.
Fastener Surface Condition- -Dry or rusty threads and bearing surfaces significantly increase the amount of torque required to tighten fasteners to a prescribed tension. F ailure to protect fasteners from environmental factors may lead to inability to properly tension the fasteners, or torsional failures during attempts to properly tension them. The necessity for adequate lubricant to achieve the desired level of bolt pretension cannot be over-emphasized- particularly in applications reliant upon higher clamping forces.
TIW Surface Condition- -Unlike nuts or bolts, TIWs themselves are not generally affected by the presence of lubricants, dust, or surface corrosion. This permits the TIW to indicate whether the chosen assembly method (usually torque) was able to attain the required clamping force. The TIW will not flatten if the surface condition of the fasteners is such that it prevents adequate tightening (e.g., seizing, galling, severe corrosion, etc.).
TIWs and Torque- .The purpose of the TIW is to indicate the adequacy of whatever level of torque has been applied. For example, fasteners which lack sufficient lubricity to enable generation of the required tension are identified as those on which the TIWs are not adequately compressed.
Lubrication- Use of fasteners in varying states of lubricity is possible with the TIW method. Fasteners which accumulate rust or dirt from shop or job site conditions can be cleaned and lubricated prior to installation without adversely impacting the ability of the TIW to indicate clamp force. However, necessary precautions for “field lubricating” may need to be considered in order to avoid introduction of any unacceptable factor.SAE J2486 pdf free download.