1" x 8 tpi spindle tap question

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Forum topic by Chris posted 06-30-2011 08:57 PM 6463 views 0 times favorited 7 replies Add to Favorites Watch
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327 posts in 3173 days

06-30-2011 08:57 PM

Topic tags/keywords: 1 spindle tap 1x8 tpi spindle tap tap for wooden spindles

I am looking to purchase a 1”x8 tpi spindle tap that is designed to be used for wood and is made or marketed by Beall. I was wondering if the tap was by chance designed to work with a 1” forstner bit for if this tap is designed like all other taps of course an undersized drill size would be used.

Therein lies the dilemma, this tap is designed for woodworkers. i am not presently familiar with any drill bit on the market outside of high speed drill bits that come in such variations of sizes which one may need to use with this tap.

Curious to know if anyone is familiar with this system?


-- Chris Harrell - custom callmaker "Quacky Calls" Eastern NC.

7 replies so far

View crank49's profile


3898 posts in 2058 days

#1 posted 06-30-2011 09:37 PM

1” x 8 tpi is a standard bolt thread for metal. I doubt, if a specialty wood thread existed, that it would use the same identical description as a metal thread. Bellow are standard metal tap and drill sizes.





You are in luck. As you can see, the drill size for a 1”- 8 thread is 7/8”. That is a standard Forstner or Brad point drill size.

I saw on Woodcraft’s site they are suggesting tapping a hole in wood to match the standard thread of a lathe spindle, so YES!, this is in fact a standard metal thread size. It is so you can remove the chuck and just screw the wood workpiece onto the lathe in place of the chuck.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

View sarahss's profile


258 posts in 1736 days

#2 posted 06-30-2011 10:00 PM

I recently checked into it for my Jet Mini lathe with a 1×8 TPI headstock. After talking with Jet and McMaster Carr, they recommended this, but I haven’t ordered it yet and don’t know if the “pitch” of the threads would be correct or not.

don’t know if you want to spend that much either, but we got the tap & dye set (1×8TPI)—from Grizzly, I think—anyway, the threads the tap cut were not compatible with my lathe headstock.

View David Kirtley's profile

David Kirtley

1286 posts in 2085 days

#3 posted 06-30-2011 11:09 PM

It is a metal tap to match the metal threads. I have one but have not used it yet. I believe the instructions do say 7/8 bit but I would have to go look when I get home.

-- Woodworking shouldn't cost a fortune:

View Chris's profile


327 posts in 3173 days

#4 posted 07-01-2011 08:46 AM

Thanks guys, i actually called Craft Supplies USA today and spoke with a rep and to reiterate what you guys are saying, the rep said the particular 1×8 spindle tap in question does utilize a 7/8” pilot hole.

So there i go!

Thanks again, Chris

-- Chris Harrell - custom callmaker "Quacky Calls" Eastern NC.

View bubinga's profile


861 posts in 1755 days

#5 posted 07-01-2011 01:22 PM

The 1×8 tap does use a 7/8” bit, a brad point is much better choice, and you can buy it,( and odd sizes) from Beall Tool
The tap you are looking to purchase, has a removable guide on the end,that guides the tap straight
I have made, and tapped wood nuts for 1/2”, 5/8”,3/4”, 1”, 1 1/4” and 1 1/2”, wood bolts.
IMPORTANT: When tapping in wood, clamp in vise to avoid splitting

-- E J ------- Always Keep a Firm Grip on Your Tool

View Chris's profile


327 posts in 3173 days

#6 posted 07-02-2011 05:17 AM

“IMPORTANT: When tapping in wood, clamp in vise to avoid splitting

—E J”

THanks EJ, with this tidbit i will not have to go through the school of hard knocks in this area. Chris

-- Chris Harrell - custom callmaker "Quacky Calls" Eastern NC.

View Thomas Hanson's profile

Thomas Hanson

43 posts in 1039 days

#7 posted 06-19-2015 12:58 PM

Update for this thread, Woodcraft and Amazon both have this tap and it works great on my Rikon mini lathe. 7/8” forstner bit works for the pilot hole. Turn in lathe if possible using tapered center to keep straight, backing the tap up frequently to clear chips.

-- Okie from Council Hill

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