Standard Diameter & Thread Pitch for G Slim. ATT 7 Weber, Tradede OC, Goodfella, EJ?

[EssDoubleYou]

TGIF! Read a great article by Codfish/Jim re the ATT 7 & saw some very cool interchangeable handles on their site ttp://abovethetie.com/?store_item=486&main=Above%20the%20Tie

I am wondering if any of you mechanically minded shavers can answer the two Qs below:

What is the 1) Diameter and 2) Thread Pitch that fits this "Standard size" that fits "the Atlas handle fits the following: Weber, Tradede OC, Goodfella, Edwin Jagger, Muhle, Gillette Old Type and Tech heads"

1) Diameter (SAE) or fractions of an inch (not likely metric given older G fit, but maybe). SAE example 8 or 10?


2) Pitch in thread count per inch. Most likely 24 or 32, but not sure?

Thanks, want to make sure it fits some of my other razors!

 

[JRL]

I'm not an expert, but after doing a lot of searching and reading, here are my notes:

There seems to be just 2 different thread sizes used on
all 3 piece razors: the #10-32 and the slightly larger Metric M5 X 0.8.

They have the same thread pitch so the metric handles will
screw onto vintage Gillette heads. Most vintage Gillette handles
have their threads worn over time, so they'll screw onto
metric heads like the EJ, Muhle and Goodfella.

A freshly tapped #10-32 handle won't screw onto a Metric head.

I think that's correct, but getting a second opinion would be a very good idea.

 

[EssDoubleYou]

Perfecto! Millie Grazzi JRL.

 

[srm_92000]

I'm not an expert, but after doing a lot of searching and reading, here are my notes:

There seems to be just 2 different thread sizes used on
all 3 piece razors: the #10-32 and the slightly larger Metric M5 X 0.8.

They have the same thread pitch so the metric handles will
screw onto vintage Gillette heads. Most vintage Gillette handles
have their threads worn over time, so they'll screw onto
metric heads like the EJ, Muhle and Goodfella.

A freshly tapped #10-32 handle won't screw onto a Metric head.

I think that's correct, but getting a second opinion would be a very good idea.

+1
Spot on IMHO but I'd just add that a new M5 handle screwed onto a worn 10-32 head is in danger of stripping the thread.

 

[wquiles]

I'm not an expert, but after doing a lot of searching and reading, here are my notes:

There seems to be just 2 different thread sizes used on
all 3 piece razors: the #10-32 and the slightly larger Metric M5 X 0.8.

They have the same thread pitch so the metric handles will
screw onto vintage Gillette heads. Most vintage Gillette handles
have their threads worn over time, so they'll screw onto
metric heads like the EJ, Muhle and Goodfella.

A freshly tapped #10-32 handle won't screw onto a Metric head.

I think that's correct, but getting a second opinion would be a very good idea.

Those are the same values I have found as well.

But then cutting new threads, besides the thread pitch, you can also alter the initial size of the hole (in female threads) which determines the minor diameter. By varying the size of the hole, you get various levels of thread engagement (technically called the thread class [1B, 2B, or 3B for internal threads]).

In theory for a 10-32 thread, you would use a #21 size drill (0.159"), but you could use a slightly larger 4.2mm drill (0.165", which will of course give you a slightly looser thread engagement) but that would be about the same size drill recommended for the M5x0.8 threads. That would make interchanging parts a "little" bit easier.

For those interested, there are many on-line programs where you can plug the thread size, and the class of fit you want (for either internal or external threads), which will give you more information:
http://theoreticalmachinist.com/Threads_UnifiedImperial.aspx

 

[alex2363]

You guys are good with these numbers, we are proud to have u at B&B as contributors.

 

[mdc]

Those are the same values I have found as well.

But then cutting new threads, besides the thread pitch, you can also alter the initial size of the hole (in female threads) which determines the minor diameter. By varying the size of the hole, you get various levels of thread engagement (technically called the thread class [1B, 2B, or 3B for internal threads]).

In theory for a 10-32 thread, you would use a #21 size drill (0.159"), but you could use a slightly larger 4.2mm drill (0.165", which will of course give you a slightly looser thread engagement) but that would be about the same size drill recommended for the M5x0.8 threads. That would make interchanging parts a "little" bit easier.

For those interested, there are many on-line programs where you can plug the thread size, and the class of fit you want (for either internal or external threads), which will give you more information:
http://theoreticalmachinist.com/Threads_UnifiedImperial.aspx

Saving this for later. Thanks!

You guys are good with these numbers, we are proud to have u at B&B as contributors.

+1