Threaded Screw Inserts

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Forum topic by Dale J Struhar Sr posted 01-01-2010 06:33 PM 3184 views 0 times favorited 17 replies Add to Favorites Watch
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Dale J Struhar Sr

490 posts in 3061 days

01-01-2010 06:33 PM

Topic tags/keywords: question

Does anyone know of a company that makes taps for threaded steel inserts?

Thanks in advance.

-- Dale, Ohio

17 replies so far

View PurpLev's profile


8534 posts in 3580 days

#1 posted 01-01-2010 06:38 PM

I’m curious – why would you need that? I mean – those inserts are self drilling into WOOD. and as such wouldn’t have a comparable tap. if you’d want to tap any material to take the insert – why not just forgo the insert all together and just tap the original screw/bolt size? the whole Idea of the insert is to avoid tapping.

unless I’m not seeing something here.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View WoodSparky's profile


200 posts in 3033 days

#2 posted 01-01-2010 06:49 PM

Let’s assume you were looking for threaded inserts. Both Wood Craft and Lee Valley should have what you are looking for.

-- So Many tools, So little time

View Dale J Struhar Sr's profile

Dale J Struhar Sr

490 posts in 3061 days

#3 posted 01-01-2010 06:50 PM

I’m putting them into hard woods (pin boxes) and have to drill the hole oversize than what is reccommended. For a 1/2 inch OD insert they want a 3/8 hole to put the insert in. No way can it be threaded into such a hole in hard woods. I have had to drill the hole to 29/64 to get the insert in.

With the insert I use it the adjust the the tightness of the top and bottom of the pin boxes I’m making.

-- Dale, Ohio

View SteveMI's profile


1084 posts in 3225 days

#4 posted 01-01-2010 07:04 PM

In 3/8” hardwood, not for a box, I have used internally threaded tubing and epoxied them in the wood. Hole is only minimally larger than the bolt diameter. For odd diameter sizes, I have bought tubing in the hobby section of hardware store and threaded them internally myself. This way you only use standard taps for the fastener size you are using.

Depending how anxious you are about epoxy, file notches (teeth) in the bottom of the tube to catch the wood when you tap it in.

I also took a bolt of same thread, ground off the head to a point, partially put into the threaded tube and then used it to transfer the position to surface I needed the thru hole in. (Use brass to reduce the amount of grinding effort)


View Dusty56's profile


11819 posts in 3619 days

#5 posted 01-01-2010 07:05 PM

If you can’t find what you need , perhaps you could visit your local Tech school and create a project for a student : ) Or if you have a local machine shop , pay them a visit.

-- I'm absolutely positive that I couldn't be more uncertain!

View lwllms's profile


555 posts in 3213 days

#6 posted 01-01-2010 07:05 PM


If you’re using the brass inserts that take a 1/4” X 20 screw, you can get a 7/16” X 16 tap from industrial supply houses. I know MSC and Enco both stock them. The 7/16 is slightly undersized but the thread pitch is right. These will greatly reduce the damage from putting the inserts in but the inserts still fit very snuggly. Enco is the least expensive and their catalog number for the tap is 327-2374. Being a non-standard size the tap is expensive for a tap at $13.95 plus shipping. I always tap the holes before installing inserts.

View Gary's profile


9311 posts in 3364 days

#7 posted 01-01-2010 07:07 PM

Hey Dale, is this for those puzzle boxes?

-- Gary, DeKalb Texas only 4 miles from the mill

View a1Jim's profile


117029 posts in 3508 days

#8 posted 01-01-2010 07:10 PM

How about an auto parts store.

-- wood crafting & classes

View Jack Barnhill's profile

Jack Barnhill

366 posts in 3297 days

#9 posted 01-01-2010 07:18 PM

I’m not sure which insert has the 1/2” OD but here is the pilot hole information that was on the back of a package of threaded inserts from Rockler.

Rockler Info for Threaded Inserts

Unless you’re using the 8-32 insert, it looks like they recommend a larger pilot hole for hardwood.

-- Best regards, Jack -- I may not be good, but I'm slow --

View rustfever's profile


746 posts in 3241 days

#10 posted 01-01-2010 07:21 PM

Grainger and Fastenal are both good sources.

-- Rustfever, Central California

View lilredweldingrod's profile


2496 posts in 3038 days

#11 posted 01-02-2010 05:40 AM

I’m with a1jim. Any auto parts store will have Heli-coil kits. They have the right size drill, thread insert and installation tool. I’ve used them for years in all kinds of metals, don’t know why it would not work in hard wood. Check out McFeely’s.


View Dale J Struhar Sr's profile

Dale J Struhar Sr

490 posts in 3061 days

#12 posted 01-02-2010 06:35 AM

The 1/4/ -20 steel is 1/2 OD. I never thought of Heli-coils. I’ll be checking them out first thing in the morning. I think they will accomplish what I’m trying to do. Thanks

Some how I knew I would find a solution to my problem by searching such great minds and experiance.

Gary they are for the puzzle boxes. With them I can adjust the tolerance between the top and bottom of the box.
Once I set the clearance a touch of super glue holds it in place.

Thanks LJ’s

-- Dale, Ohio

View Brett's profile


49 posts in 1260 days

#13 posted 04-16-2015 11:07 AM

I know it’s late, but for anyone browsing around looking for a threaded inserts supplier check out Fastening Solutions UK. Great group of lads providing affordable inserts.

-- Brett, United Kingdom,

View SirIrb's profile


1239 posts in 1162 days

#14 posted 04-16-2015 12:38 PM

I have used these for salt cellers.
1. drill tap hole
2. using an allen wrench install the self tapping insert
3. done.

Why do you need a tap to tap a hole that is self tapping?

You can buy wood taps/dies but i have only seen them for larger sizes. But if it really bothers you you can use a metal tap on wood. I just dont know why. The self tapping-ness of the insert will give a better/tighter installation than if you tapped the hole, in my opinion. make sure you are perpendicular to the wood upon install of the insert.

-- Don't blame me, I voted for no one.

View hotbyte's profile


991 posts in 2907 days

#15 posted 04-16-2015 12:47 PM

Wonder if you could use a 3 sided file to put some “cutters” into the lower portion of outside threads to help cut the threads? I would not be tapered like a tap but, in wood, might help get the job done.

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