T3 Fence Installation Question

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Forum topic by lburgwin posted 05-28-2016 02:49 PM 636 views 0 times favorited 5 replies Add to Favorites Watch
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3 posts in 905 days

05-28-2016 02:49 PM

Greetings! Long time lurker, but first time poster here. I’ve got an issue with a Delta T3 Fence/Rail system installation, so figured it was time to sign up and ask you all.

I have a Delta 34-410 TS, and until yesterday, it was sporting the original round rails and JetLock fence. The fence looked like someone pounded fence posts with it, so it needed changing. I purchased a Delta T3 fence and rail system, however, the bolts that attach the front guide rail to the saw are not the size I need.

The original rail bolted directly to the cast iron portion of the table. The cast iron itself was drilled and tapped for what looks like 7/16-18 bolt. The schematic is here: and the bolt is labeled as part 10 in the schematic “Special Screw #422-04-112-500”

The bolts that came with the rail to attach are 5/16-18. These will work fine for the wings, but not for the holes in the cast iron. As you can see in the schematic, the way they mount in the cast iron does not allow for a lock washer and nut to be attached behind.

Have any of you encountered this? The obvious answer here is for me to find the proper size flat head bolts to thread in there and try out, but I’m worried that the heads will sit too proud in the rail, thus not allowing the fence to slide back and forth.

Thanks in advance for any insight or thoughts you all have.

PS: All the holes DO indeed line up.

5 replies so far

View wuddoc's profile


318 posts in 3894 days

#1 posted 05-29-2016 03:29 AM

Check out McMaster-Carr. They have pages of specialty bolts

-- Wuddoc

View JIMMIEM's profile


43 posts in 1017 days

#2 posted 05-29-2016 01:22 PM

If the flat head screws sit proud of the rail get a countersink bit and drill the rail holes to set the screw heads lower. The rail is relatively thick and making/deepening a countersink won’t be a problem. Use a good countersink and cutting oil.

View mrg's profile


834 posts in 3175 days

#3 posted 05-29-2016 09:54 PM

I have the same era saw and the T3 bolted right up. Just checked, the bolt goes thru the cast table two washers and the nut. The thread doesn’t stick out as far as the stamped wings once bolted together.

-- mrg

View conifur's profile


955 posts in 1327 days

#4 posted 05-29-2016 10:13 PM

My 2 deltas use metric to attach to the cast iron thread holes.

-- Knowledge and experience equals Wisdom, Michael Frankowski

View lburgwin's profile


3 posts in 905 days

#5 posted 05-30-2016 03:59 AM

Thanks for all the input fellas. I got it all setup and making sawdust!

For the 4 bolts that thread straight into the cast iron table top, I had to go up to 3/8-24. The -24 vs -18 (from the packaging) surprised me a bit.

The heads of the 3/8 flat heads were significantly larger, so I did as Jimmiem suggested and countersunk the hole a bit more.

Thanks for the help fellas!

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