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Strong Mount bolt size

My 550B will be here Thursday.  I want to have everything ready to mount it to my bench.  Could someone tell me what diameter bolt i will need for the Strong Mount ?  I don't need the length, just diameter.  Been waiting 7 weeks and don't want to waste time on Thursday running to Lowes to buy the bolts.  Thanks in advance !

1/4" bolts.

My strong mount for the 650 came with bolts.

How Long Were the Bolts that the Strong Mount comes with?

My strong mount is attached with 1/4 x 20 bolts. Through bolt is the best way to go. I utilized heavy duty fender washers. The large washers were underneath the bench, as the mount will serve that purpose on the upper surface.

Sorry, I never got to the last post, this thread being 4 yrs old. My bench is a full 2 1/2" solid maple block. I used 3 1/2" bolts.

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