It's designed for decking and railings so yes otherwise this would be a poor choice by the manufacturer. Screws are galvanized and drive easy with an impact driver. You will need a lag bolt and nut.
Loading table exist on manufactures site: https://www.strongtie.com/deckties_decks/dtt_tie/p/dtt#LoadTables
6-15/16" 1/16" shy of 7-inches.
Not sure what you mean by 1800 lb straps. Performance depends somwhat on the wood species, but in general these are rated for tension loads of 850 lb.
Maybe address this question to Simpson Strong Tie
One is enough for posts along the edge. You probably will need two for the corner posts. Longer rods are fine. Take a look at this http://www.deckmagazine.com/design-construction/railings/code-compliant-guardrail-posts_o
You could try and use one of Simpson's narrower tension ties and install it on the bottom of the 2x6, which, depending on the center line dimension, could increase the distance between bolts anywhere from 3/4" to 1-1/2". The DTT1Z is intended for installation on the narrow face of a joist, however if this doesn't get you the loads you need the LTT19 is narrow enough to fit on the narrow face of the joist (at the underside). If the configuration works, you could also add blocking to widen the joist and use something heavier, such as the HDQ/HHDQ series.
Galvanized steel threaded rod should be used if used in deck construction, threaded rod size is 1/2" for deck tension tie.
I placed a guard post on a flat surface and marked the location of the top bolt hole using a DTT2Z. I then measured 2" from the bottom of the post and marked the location of the bottom bolt hole. Then I set up stops on my drill press so that I could drill all of the bolt holes in all of the guard posts. Finally, while installing a guard post, I clamped the post to the rim/band joist, plumbed it, and then drilled through the joist using the holes in the clamped guard post as guides. I was able to drill all of these bolt holes from below my raised deck.
Hi, Unfortunately the item cannot be shipped to the following territories/state(s): Alaska, Guam, Hawaii, and Puerto Rico. There are various logistical, governmental or economic factors that could restrict online merchandise in this way. Thanks for shopping Home Depot!