Jowo or Bock #6 dies? (Not Taps)

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Leonardo

Leonardo

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Joined
Jun 3, 2025
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Nashville, IN
Hello folks,

Does anyone know if it's possible to purchase/commission/make a die to pair with a Jowo or Bock tap?

To start I want to do this for Jowo #6 size housing, but eventually may want to have this for Bock as well.

I was planning to order a M7.4 x .5 Tap for #6 nibs from Meisternibs today, however may pivot to an M7.5 version if there is a die for that one but not the M7.4. If it has be be made/commissioned, then I believe I would prefer the M7.4 since if I understand correctly, is the native thread size for Jowo 6 housings.

For context, one of my pen designs contains a custom designed nib housing and I would it to be interchangeable with a Jowo or Bock nib housing. I have had some success 3D printing this piece in my prototype testing, but the threading would be more robust and accurate with a die than what I have been able to approximate in TinkerCAD.

Thanks all!

Leo
 
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I somehow missed this in my previous research but I found a comment in this thread suggesting that the M7.5 version is available on Amazon and Ebay, and when I looked at Amazon they also have pairs including the matching die. I had actually already read that thread a couple weeks ago and must have missed forgotten this part. Sorry I thought I had done my research!
 
Update: Tapco reached out asking about the H limit on the M7.4 tap which I believe is H6 but the photo isn't clear enough to make out for sure. If anyone has one of these and can let me know, I would appreciate it. The M7.5 versions I have found were all H6, as was the M6.5 Jowo 5 tap from Meisternibs, so I think this should be the same for the Jowo 6 Meisternib tap.

I also ordered a cheap m7.5 tap and die from Amazon for testing and a handful of taps and dies from Victor Machinery to get started with caps and sections.
 
Perhaps this will help you. The part number is the Tapco part number. These are prices from the group buy in 2020. I don't think these have been done in a group buy since then.

We just completed a group buy from Tapco, and the prices are much higher now than what you see below from 2020. Maybe 60-70% higher based on prices we got for single-unit 1" dies.

1749161019171.png
 
Wow that's a bit more than I expected. I just ordered a "M7.5 X 0.5 Metric Round Die, Right Hand Machine Thread Die M7.5 x 0.5mm" for $13 from Amazon. It's not adjustable but I figured it would be worth a shot for the price.
 
From my experience with threads in polymeric materials and ebonite, it makes no difference whether they are 7.4 or 7.5 mm. There is a certain elasticity, so that you don't notice much difference in the machined part.
There is also no need for more expensive tools made of high-hardness steel. The materials are relatively soft and easy to cut,
ensuring a long life for the cutting tools.
For a better finish on the threads, I recommend using some cutting fluid, which prevents jamming and possible cracks.
Have fun!
 
I heard back from TapCo and they gave me these prices:

Item/Amount1pc2pc3-5pc6-11pc
M7.4-.5 HS 1"OD Die$312$241.20$102.08$75.75

Item/Amount1pc2pc
The M7.4-.5 D4 Plug tap with TiN treat$212.56156.72

Based on what Herman mentioned above (thanks!) it looks like these aren't really necessary, but since I've got the data, here it is. I will post an update later after my M7.5-0.5 die comes in later this month.
 
hooked said:
Perhaps this will help you. The part number is the Tapco part number. These are prices from the group buy in 2020. I don't think these have been done in a group buy since then.

We just completed a group buy from Tapco, and the prices are much higher now than what you see below from 2020. Maybe 60-70% higher based on prices we got for single-unit 1" dies.

View attachment 385205
Click to expand...
Thank you for sharing this!
 
Leonardo said:
Hello folks,

Does anyone know if it's possible to purchase/commission/make a die to pair with a Jowo or Bock tap?

To start I want to do this for Jowo #6 size housing, but eventually may want to have this for Bock as well.

I was planning to order a M7.4 x .5 Tap for #6 nibs from Meisternibs today, however may pivot to an M7.5 version if there is a die for that one but not the M7.4. If it has be be made/commissioned, then I believe I would prefer the M7.4 since if I understand correctly, is the native thread size for Jowo 6 housings.

For context, one of my pen designs contains a custom designed nib housing and I would it to be interchangeable with a Jowo or Bock nib housing. I have had some success 3D printing this piece in my prototype testing, but the threading would be more robust and accurate with a die than what I have been able to approximate in TinkerCAD.

Thanks all!

Leo
Click to expand...
Regarding 3D, resin printers are great for smaller and more delicate parts. Elegoo and Anycubic offer several options with great resolution and reasonable cost. Resins are becoming more resistant every day, ABS-like is very good for use in pen parts.

If you are going to work with threaded parts, forget TinkerCAD. I recommend Autodesk's Fusion 360 software. You can generate threads, even the thinnest or multi-entry ones, and directly obtain the STL model that will be used in the 3D printer.

The best thing about Fusion 360 is the free version for hobbyists and students. There are some limitations for full professional use, but for hobbyists like us it is honestly more than necessary. On YouTube, you can find several basic courses and learning is not complicated.

Have fun with your pens!
 
Herman said:
Regarding 3D, resin printers are great for smaller and more delicate parts. Elegoo and Anycubic offer several options with great resolution and reasonable cost. Resins are becoming more resistant every day, ABS-like is very good for use in pen parts.

If you are going to work with threaded parts, forget TinkerCAD. I recommend Autodesk's Fusion 360 software. You can generate threads, even the thinnest or multi-entry ones, and directly obtain the STL model that will be used in the 3D printer.

The best thing about Fusion 360 is the free version for hobbyists and students. There are some limitations for full professional use, but for hobbyists like us it is honestly more than necessary. On YouTube, you can find several basic courses and learning is not complicated.

Have fun with your pens!
Click to expand...
Thanks Herman! This is funny because I was watching a Fusion 360 tutorial last night since I couldn't adjust the thread angle in TinkerCAD and was looking for something with more control. I haven't tried it yet but glad to hear I'm on the right track! Hoping to pick up a resin printer later this summer.
 
Leonardo said:
I heard back from TapCo and they gave me these prices:

Item/Amount1pc2pc3-5pc6-11pc
M7.4-.5 HS 1"OD Die$312$241.20$102.08$75.75

Item/Amount1pc2pc
The M7.4-.5 D4 Plug tap with TiN treat$212.56156.72

Based on what Herman mentioned above (thanks!) it looks like these aren't really necessary, but since I've got the data, here it is. I will post an update later after my M7.5-0.5 die comes in later this month.
Click to expand...
If you ever decide to do this as a group buy, I'd be interested in participating. I'd like to acquire all the matching taps and dies for both bock and jowo.

I'll look in my collection, as I have several of them, but im always game to have doubles or triples of everything.
 
I would too eventually. I just got a "Winfox" brand M7.5 tap and haven't tried it yet but visually it looks well made and crisp. It came with a 7mm drill bit. The die won't be here for a couple weeks and is "Aceteel" brand. Both from Amazon around $12 each. I will post an update when I have tested them.

The rest of my taps and dies were ordered from Victor Machinery except for one M11x.75 die which was out of stock at VME, that I was able to find from Home Depot with free shipping. It shall be a big experiment on if these taps and dies from various manufacturers will fit together.

I am also just using all single start taps for now. I like the idea of being able to match up the patterns in my blanks this way and the more robust single threading. However, I'm sure I'll try triple starts eventually.
 
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