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Stuart pump

Stuart pump

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3404607/02/2019 11:01:40
594 forum posts
6 photos

The threads for the unions are 3/8 by 40

How do I do them please ?


John Rudd07/02/2019 11:18:07
1365 forum posts
58 photos

From the comfort of my arm chair, here's how I would.

Chuck a piece of hex brass bar with the required a/f size. Machine the two diameters to suit taste, centre drill, then drill thru to diameter of pipe cone o/d. Bore out to minor diameter of 3/8 x 40 thread, then tap with appropriate tap to required depth. Part off at required length.

You could use a D bit to form the minir diameter to give a flat bottom inside the nut.

Does this help?

Edited By John Rudd on 07/02/2019 11:18:46

JasonB07/02/2019 11:25:40
15775 forum posts
1650 photos
1 articles

Is it the male thread on the body or the female in the nuts you are asking about?

If it is the male bosses then mark ctr of boss, set up in the 4-jaw or on an angle plate on the face plate to get the mark running true. face off then turn OD to 3/8" and then thread with die or single point if you prefer.. Could also be done on the mill or even the lathe with a boring head set for external cutting to round off the bosses.

For the Cone I drill with a suitably sized ctr drill which will give the angle and then drill the clearance hole.

Edited By JasonB on 07/02/2019 11:33:25

3404607/02/2019 11:32:38
594 forum posts
6 photos


The male thread on the body - Stuart supply nuts and unions so ok on that score.


Edited as posting while you replied - thanks 

Edited By Bill Chugg on 07/02/2019 11:34:03

JasonB07/02/2019 11:33:52
15775 forum posts
1650 photos
1 articles

Added method above.

3404607/02/2019 11:35:14
594 forum posts
6 photos
Posted by JasonB on 07/02/2019 11:33:52:

Added method above.

Postin at same time as yourself again

Jason - many thanks - all ok now.

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