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OE Japanese Bolt Head Numbers


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Recall some vague discussion ages ago on what these numbers represent, a recent search showed that some car business people were stating categorically that the numbers were assembly torque settings. Well they are not, see chart below from a Subaru FSM.

post-185-0-64020200-1375425771_thumb.jpg

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Not Torque, tensile grade. I see the Nissan TSB was posted, let it speak for itself.

 

(INDIRECTLY it is a torque indicator, but only in the context of finding 75-80% of yield to properly clamp a joint!)

 

Torque is a terrible indicator of fastener state. Universally high stress joints have moved to ksi/stretch monitoring for critical fasteners. Too many variables using "torque"!

Edited by Tony D
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