Martin Committee Tenor Neck Screw

[Mikey B]

Hi everyone, I could really use some help with the dimensions and thread size of the neck thumbscrew that retains the neck to the body on the above horn. Any help as always is greatly appreciated.

Many thanks in advance, Mike

 

[rhysonsax]

If it's the same as the Martin alto I could measure that on mine.

But I expect there will be a Martin tenor owner along in a while.

Rhys

 

[altissimo]

the screws on my 1930's Handcraft tenor and 1950's Indiana alto are the same thread size - I just swapped them over and they both fit, not sure what thread it is - obviously not metric, but there's more than one type of inch thread...
I see from this that the Comm III had a different type of neck screw than the common transverse type - http://www.doctorsax.biz/2012/Martin_Neck_Screw.htm

 

[thomsax]

Martin Comm I and II or The Martin Tenor (Comm III)?

 

[Mikey B]

Sorry guys, don't have all the jingo on exact year and model yet! Will follow this up shortly. Thanks.

Mike.

 

[Mikey B]

Jingo should read info, oh well, that's spill chick for you!

 

[jbtsax]

Here you go: Martin Committee neck screw.

Most American made saxes use 8-32 neck screws for typical neck sockets or receivers. The Martin is a different animal altogether.

 

[altissimo]

depends if it's one of these -

or one of these -

 

[thomsax]

For The Martin I think a baritone(brass) or sousaphone bell screws works. The are not wing screws. The Martin have round screws. 8-32 = 4,7 mm? I not familiar with the "inch system".

 

[ProfJames]

I need one for my Handcraft so please let me know where they can be sourced. The one I need is for the type of neck in the first photo

 

[thomsax]

I need one for my Handcraft so please let me know where they can be sourced. The one I need is for the type of neck in the first photo

I have some new replacement neck screws in inches. Just brass left. The nickel screws are gone. Can you mesure in mm?

 

[ProfJames]

I have some new replacement neck screws in inches. Just brass left. The nickel screws are gone. Can you mesure in mm?

Will do Thom but I cannot get to the sax tonight. Will post the mm measurement tomorrow.

 

[jbtsax]

The link I posted had a picture of the round screw shown in Altissimo's lower picture with the information that it is a SAE (standard American engineers) 10 - 32 thread. The one in the upper photo is most likely an 8 - 32.

 

[Mikey B]

Thanks everyone, this is a great resource we are lucky to have access to all this information.

 

[Mikey B]

Just resurrecting this thread again as I had too many balls in the air the at the time. The neck screw is for a Comm III tenor.

What diameter should the knurled section of the thumb screw be? And what thickness? And overall length including the 10-32 thread

Thanks everyone.

 

[saxismyaxe]

The screw head on the tenor has a diameter of 15mm, with a thickness of 4mm.

The thread is indeed 10-32nds, and the the threaded portion is 10mm long. However the head is machined with hollowed pocket of 2mm in which the threaded section is soldered (And the 2mm felt washer sits in this pocket), so the actual exposed threaded portion is 8mm.

 

[jbtsax]

The screw head on the tenor has a diameter of 15mm, with a thickness of 4mm.

The thread is indeed 10-32nds, and the the threaded portion is 10mm long. However the head is machined with hollowed pocket of 2mm in which the threaded section is soldered (And the 2mm felt washer sits in this pocket), so the actual exposed threaded portion is 8mm.

I don't understand the part about the "felt washer". Can you provide a picture?

 

[saxismyaxe]

There is a felt washer that fits into the machined recess on the underside of the screw roundel. The whole screw affair is very much like an oversized trumpet valve finger pearl, felt washer and all.

 

[saxismyaxe]

 

[MontyMac]

The thread is indeed 10-32nds,

Just an "observation" from an American Machinist and Assembler: (read insufferable perfectionist) the size designation in Not A Fraction. { i.e. 10/32 should be 5/16?}
A #10 screw is about 3/16th of an inch and can be threaded in 24 threads per inch (National Coarse), 32 threads per inch (National Fine) or 40 tpi (National Special).
Trust me, I deal with this with my younger mechanics all the time.
I found this chart a few months ago as a guide for selecting replacements.
http://www.engineeredpartsinc.com/pdf/metric-conversions.pdf