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West-East
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Join Date: Sep 2008
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Mating Thread for Grease Fitting with DIN 714121 Threads

10/10/2008 10:21 AM

I am using Alemite #2108 grease fitting. The data sheet calls out M6 x 1 pitch taper metric thread conforming to German standard DIN 714121

I can't find any reference to this thread in Machinerys Handbook (25th ed) and I know that sometimes tapers mate to straight threads.

Do I tap the mating part with a taper thread or a straight thread?

I do not have access to the DIN specificaton either.
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Tim in Mexico
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#1

Re: Mating Thread for Grease Fitting with DIN 714121 Threads

10/10/2008 11:23 PM

If this is isolated to one particular piece of equipment and not the entire plant, why not simply tap the hole with a standard readily available size. Being careful not to contaminate the lubricant of course...
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dadw5boys
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#2

Re: Mating Thread for Grease Fitting with DIN 714121 Threads

10/10/2008 11:36 PM

http://www.alemite.com/catalog/details.aspx?identifier=fittings_metric

or the special thread

http://www.alemite.com/catalog/details.aspx?identifier=fittings_specialthread

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sidevalveguru
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#3

Re: Mating Thread for Grease Fitting with DIN 714121 Threads

10/11/2008 8:55 AM

i'm doing this ugly thing today!

Just pulled out some straight thread M6 grease fittings; replaced w/ tapered thread fittings. (to go from in-line to 90° angled). The interference started when i was at a good assembly depth, & seemed to be within reasonable limits for the 'clocking' i needed to do. I'm sure you could get away with this in the odd case.

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dadw5boys
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#5
In reply to #3

Re: Mating Thread for Grease Fitting with DIN 714121 Threads

10/11/2008 2:03 PM

I always try to use a bottom taps for grease fitting.

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bwire
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#9
In reply to #3

Re: Mating Thread for Grease Fitting with DIN 714121 Threads

10/12/2008 9:08 PM

Yeah go ahead wrap some thread into the thread add some nail polish and get on with it

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HarryBurt
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#4

Re: Mating Thread for Grease Fitting with DIN 714121 Threads

10/11/2008 10:05 AM

Grease fittings are cheap. Why not just buy some straight thread ones and throw the tapered ones out?

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dadw5boys
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#6

Re: Mating Thread for Grease Fitting with DIN 714121 Threads

10/11/2008 2:04 PM

What is the pressue rating for this fitting ? 8000 lb psi ? like the manuel says ?

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nick name
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#7

Re: Mating Thread for Grease Fitting with DIN 714121 Threads

10/12/2008 10:28 AM

Normaly the female thread is straight and only the male thread is tapered.
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bwire
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#8
In reply to #7

Re: Mating Thread for Grease Fitting with DIN 714121 Threads

10/12/2008 9:06 PM

The ^%$# you say?

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West-East
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#10

Re: Mating Thread for Grease Fitting with DIN 714121 Threads

10/13/2008 6:53 AM

Thank you all for your input. We had used straight threads in the mating piece in the past but no one here at work seems to know why.

I was hoping someone out there had access to the DIN 714121 to "get it in writing" that straight threads were acceptable.
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Tim in Mexico
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#11
In reply to #10

Re: Mating Thread for Grease Fitting with DIN 714121 Threads

10/13/2008 7:48 AM

Better to have asked this from the start...
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bwire (2); dadw5boys (3); HarryBurt (1); nick name (1); sidevalveguru (1); Tim in Mexico (2); West-East (1)

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