Convoy Hosts - Improvements To Older Models

[NeutralFan]

I receives 2 hosts from Simon yesterday - an S6 and S2. Both are in perfect condition! The S6 has very matte black anodizing with lots of grip and the S2 gray looks great.

I found it interesting that the S6 came with square trapezoidal threads and the S2 has trapezoidal triangular threads. The S6 threads feels so nice when assembling the head or tail to the body. The S2 trapezoidal threads are good too, but not as nice as the S6.

And both host use the Omten 1288 switch. My other S2, purchased many years ago, has the older style square switch which took some modification to install a lighted switch.

6/14/21 Edited to accurately describe the threads and the intent of the post.

[zoulas]

Bunch of posts on BLF with similar statements made about inconsistent threads through production runs.

[NeutralFan]

I seems Simon is eventually switching to square threads for all his flashlights - which is a good thing. I’m fine either way since I don’t LEGO my flashlights. And I like that he is now using the Omten 1288 switch for these older style flashlights.

[ShyOne]

Simon is in the process of change to square threads.

So this has nothing to do with manufacturing inconsistency. It has to do with old stock & new stock as well as retooling schedules by the machine shop.

A nice upgrade by Convoy.

[Hoop]

What you are calling trapezoidal are triangular threads. (60 degree included angle) The one you are calling square may be trapezoidal, (15 degree angle per side) it is hard to tell from the picture but it does not appear dead square.

[NeutralFan]

There is certainly a flat spot on the S2 threads, therefore they are trapezoidal which is normal for Convoy flashlights. As for the S6 threads, I’m not sure how they could be any more square.

[Hoop]

The flat on the crest is called truncation. They are truncated triangular threads, the included angle is 60 degrees. The square threads may be square or at least steeper than 15 degrees per side, I can’t tell from the picture. If there is any flank angle they are technically a trapezoid. If they do have a 15 degree flank, 30 degree included, that would make them a trapezoidal thread which conforms to the metric trapezoidal profile. The Acme thread profile is nearly identical but has a 29 degree thread angle rather than 30.

[MascaratumB]

Not sure if it happens on yours too, NeutralFan, but the heads of my S6/S2/S2+ are interchangeable between the different 18650/18350 tubes, but the tailcap of the S6 does not fit the other tubes, only the S6 one.

[zoulas]

@Hoop

The flat on the crest is called truncation. They are truncated triangular threads, the included angle is 60 degrees. The square threads may be square or at least steeper than 15 degrees per side, I can’t tell from the picture. If there is any flank angle they are technically a trapezoid. If they do have a 15 degree flank, 30 degree included, that would make them a trapezoidal thread which conforms to the metric trapezoidal profile. The Acme thread profile is nearly identical but has a 29 degree thread angle rather than 30.

The only person that would know this is a machinist.

[NeutralFan]

@Hoop

The flat on the crest is called truncation. They are truncated triangular threads, the included angle is 60 degrees. The square threads may be square or at least steeper than 15 degrees per side, I can’t tell from the picture. If there is any flank angle they are technically a trapezoid. If they do have a 15 degree flank, 30 degree included, that would make them a trapezoidal thread which conforms to the metric trapezoidal profile. The Acme thread profile is nearly identical but has a 29 degree thread angle rather than 30.

Well Hoop, when you’re right, you’re right. I appreciate the info!

I’ll update the OP accordingly.

I thought this diagram does a good job showing the difference between the thread designs:

[NeutralFan]

@MascaratumB

Not sure if it happens on yours too, NeutralFan, but the heads of my S6/S2/S2+ are interchangeable between the different 18650/18350 tubes, but the tailcap of the S6 does not fit the other tubes, only the S6 one.

This is my first S6 and with the new thread design it certainly won’t be interchangeable with the others. But maybe it will be now with the others that have the newer thread design.