Pen Mandrel Thread Size?

[toomanysplinters]

Does anyone know that the thread size is on the mandrels that Arizona Silhouette sells?

 

[Chris Hare]

I think it is a 1/4" dia. machine thread.

Hope this helps.

 

[Paul in OKC]

1/4-28 is pretty much the standard. Some older mandrels had a 10-32 thread on the end that went into the morse taper end.

 

[Mudder]

Originally posted by Paul in OKC
<br />1/4-28 is pretty much the standard. Some older mandrels had a 10-32 thread on the end that went into the morse taper end.

Yep,

1/4-28 on all the mandrels that I own.

 

[Randy_]

Scott: Others have offered the correct answer to your question; but it is worth noting that the mandrels sold by WOODCRAFT reportedly have a different thread. I don't remember that the actual threading has ever been mentioned; but it is supposedly a little smaller than the standard 1/4 x 28.

Since the subject has come up, think I will email WOODCRAFT and see if they will give me the information.

 

[Fred in NC]

Before going too far with this, it would be better to find out which end of the mandrel shaft are we talking about.

Most of the mandrels in the market have a 1/4-28 thread in the tailstock end (for the round nut). The only exception I found is with some of the PSI mandrels.

The end that screws into the Morse plug is another story. . .

 

[Randy_]

My Berea mandrels(both the "A" and "B") have the same thread on both ends. I think it is the 1/4" x 28 thread but am not sure

 

[Randy_]

Originally posted by Fred in NC
<br />...The only exception I found is with some of the PSI mandrels...

Fred: What is the thread on the PSI mandrel??

 

[Fred in NC]

What is the thread on the PSI mandrel?? --&gt; 1/4-20

 

[Randy_]

Thanks!!

 

[Randy_]

Just got a reply from WOODCRAFT:

"...It has a 5mm x 0.8 thread pitch..."

 

[woodman928]

Dem silly little milly meters [][][]

 

[Fred in NC]

Randy, please correct me if I am wrong, but is that the size of the thread that goes into the Morse taper plug ? The nut end of all my Woodcraft mandrels is 1/4-28.

 

[Randy_]

Fred: I forgot to ask that question when I emailed WOODCRAFT. I assume it is the arbor end of the mandrel based on previous posts saying the WC mandrels would not fit other arbors. Anyway, after realizing my mistake, I sent Woodcraft another email for clarification; but it was after 5 so I'm not expecting an answer until tomorrow.

 

[KenV]

I ran the "screw chekr" on and off the AZ A and B and a PSI mandrel 1/4 by 28 both ends of all three --

 

[scubaman]

Berea mandrels use 1/4-20 (1/4 NC). At least the high precission shafts do - never saw the other one. All others I know of use 1/4-28 (1/4 NF) at the tailstock end. Both are standard nuts available in any HW store

 

[Randy_]

Originally posted by KenV
<br />
I ran the "screw chekr" on and off the AZ A and B and a PSI mandrel 1/4 by 28 both ends of all three --

"...Houston, we have a problem..."

Fred said one end of his PSI mandrel was 1/4-20. We have a conflict here unless PSI has put out mandrels with different threads. Fred...???...Ken...???

 

[Fred in NC]

Well, I own ONE PSI mandrel, over 2 yrs old, and it does have 1/4-20 thread at the nut end. The other end is plain, for a drill chuck. It was marginal, and I switched over to Woodcraft mandrels.

 

[KenV]

I am using a Brownell's Screw Checker on a PSI Item PKM-ALX mandrel and both ends still go in the 1/4 by 28 NF hole.

Love the screw checker -- have been using this one for many years and it has save a number of wrong assumption from becoming repair opportunities.