metric thread sealtite connectors

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eeelectric8

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Hi Guys,
Lately we have been getting a lot of Busch compressors and vacuum pumps. And of course they come with Italian motors (Lafert) with metric threads in the peckerheads. Does anyone have any idea what size these threads are and where to get metric metallic liquid tite connectors ? Asking Busch or Lafert is like pulling teeth. They are so close to 3/4" standard you can almost bull a standard connector in place. Same thing with 1". Sometimes I can install a 1/2" in a 3/4" KO and lock nut it. But in large compressors the wire size is too great for a 1/2" connector.
 
Tap it out

Tap it out

They are close, I think it is british thread size. I just run a tap for 3/4 npt in it, it cross threads some but not enought to screw it up.
 
I get a lot of import equipment, what is see is "PG" threads, which are not metric.
Sealcon has a good selection of cord grips, LT fittings

https://www.sealconusa.com/products/liquid-tight-strain-relief-fittings/

Most of the equipment I see, Danfoss, Grundfoss, E&H, Siemens, is intended to be wired with cord grips and cables. European installations do not use conduit and wire, and I find the enclosures are small and delicate, hard to connect a 3/4" LT conduit fitting, worse if you need more than one conduit
 
I also suggest the adapters. I used them on occasion when I worked for a machine tool builder and we had the occasional piece of equipment with metric threads.
 
What a learning experience

What a learning experience

I've been in electrohydraulics for over 30 years and I thought I knew what PG was ... the size (in mm) of the cable that the Packing Gland could handle. PG specification was common for cable "strain relief" grommets in my world.

I never thought that peckerheads were threaded for PG, rather NPT in the USA, and BSP in most of the rest of the world.

What I learned matches other responses, pg is a thread spec. Per Maryland Metric, "DIN 40430 Pg thread usage will eventually be phased out in continental Europe." What's this, a DIN spec that is not hard metric? Take a look at https://mdmetric.com/tech/thddat6.htm for confusion. Pitch is inch based, diameter seems to match nothing.

The current (since 2001) European threads are to DIN EN 50262 ... that's a British standard, not ISO, but hard metric. See the Maryland Metric site, https://mdmetric.com/tech/thddat10.htm for details.

I now know less than I did before. Perhaps ISO will come to the rescue?
 
GeorgeB said:
I've been in electrohydraulics for over 30 years and I thought I knew what PG was ... the size (in mm) of the cable that the Packing Gland could handle. PG specification was common for cable "strain relief" grommets in my world.

I never thought that peckerheads were threaded for PG, rather NPT in the USA, and BSP in most of the rest of the world.

What I learned matches other responses, pg is a thread spec. Per Maryland Metric, "DIN 40430 Pg thread usage will eventually be phased out in continental Europe." What's this, a DIN spec that is not hard metric? Take a look at https://mdmetric.com/tech/thddat6.htm for confusion. Pitch is inch based, diameter seems to match nothing.

The current (since 2001) European threads are to DIN EN 50262 ... that's a British standard, not ISO, but hard metric. See the Maryland Metric site, https://mdmetric.com/tech/thddat10.htm for details.

I now know less than I did before. Perhaps ISO will come to the rescue?
Click to expand...

DIN, Deutsches Institut für Normung
 
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