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jacques
05-09-2007, 06:13 AM
Hello, I am looking for screws for the compression of my jbl 4343 (2420).
It is not the same standard in France.
Can somebody tell me which type of screw it acts? (information to be given to the store which is not near from my home)



jacques

ayaboh
05-09-2007, 07:04 AM
1/4" UNC. Don't remember the length.

Fangio
05-09-2007, 07:34 AM
1/4" UNC. Don't remember the length.
Yep. Length is 1" that would be ~ 25mm.

jacques
05-09-2007, 08:10 AM
Yep. Length is 1" that would be ~ 25mm.

ok 1/4 UNC and 1"" length

thanks a lot Ayaboh and fangio

I changed myself the drivers of compressions (the old in aluminium and the new in titane)
the screws were so tight that I have to use a drilling machine to make jump the head of the screws (very carrefully)
but I forgot that the standard of the screws was different (damned :))
now I can phone to a shop in paris where it's possible to find screws like this



jacques

Fangio
05-09-2007, 08:32 AM
Well it's an ancient standard but psssst.. don't tell that to the anglo-saxon majority here. :duck:

May I ask - why did you choose titan diaphrams as replacement?

jacques
05-09-2007, 11:57 AM
Well it's an ancient standard but psssst.. don't tell that to the anglo-saxon majority here. :duck:

May I ask - why did you choose titan diaphrams as replacement?


my living room is very reverberating
seriously besides I plan to pose an acoustic treatment on the wall of the bottom and the ceiling
I find that the high frequencies are a little too important and hard
one of my friend, with 4345 , has change the aluminium diaphrams for titane diaphrams and the sound is softer (not so straight like aluminiun)

so, as I found originals' jbl diaphrams in titane (and not very expensive !) I wanted to test them

but I forgot the screws (I am a french jbl newbies :-) )

edgewound
05-09-2007, 12:57 PM
ok 1/4 UNC and 1"" length

thanks a lot Ayaboh and fangio

I changed myself the drivers of compressions (the old in aluminium and the new in titane)
the screws were so tight that I have to use a drilling machine to make jump the head of the screws (very carrefully)
but I forgot that the standard of the screws was different (damned :))
now I can phone to a shop in paris where it's possible to find screws like this



jacques

It seems to me that you're interested in the diaphragm mounting screw size, which is #6-32 x 5/8".

The horn mounting screws are 1/4-20

Bruno GINARD
05-09-2007, 01:30 PM
Hi Jacques,

TRy that :

http://www.radiospares.fr/cgi-bin/bv/rswww/searchBrowseAction.do?obs=sObs&name=SiteStandard&No=0&N=0&Ntk=I18NAll&Ntt=vis%20us&Nty=1&D=vis%20us&Ntx=mode%20matchpartial&Dx=mode%20matchpartial&callingPage=/jsp/search/search.jsp&BV_SessionID=@@@@0989589343.1178738891@@@@&BV_EngineID=cccjaddklgfidegcefeceeldgondhgh.0&cacheID=f1ie&Nr=avl:f1

jacques
05-10-2007, 12:45 AM
It seems to me that you're interested in the diaphragm mounting screw size, which is #6-32 x 5/8".

The horn mounting screws are 1/4-20

hello,
before to change the diaphragm, your are oblige to separate the 2420 in two parts
I speak about the four screws which maintains these two parts

sorry but my english is not my first language and I am not very clear

jacques

jacques
05-10-2007, 12:48 AM
Hi Jacques,

TRy that :

http://www.radiospares.fr/cgi-bin/bv/rswww/searchBrowseAction.do?obs=sObs&name=SiteStandard&No=0&N=0&Ntk=I18NAll&Ntt=vis%20us&Nty=1&D=vis%20us&Ntx=mode%20matchpartial&Dx=mode%20matchpartial&callingPage=/jsp/search/search.jsp&BV_SessionID=@@@@0989589343.1178738891@@@@&BV_EngineID=cccjaddklgfidegcefeceeldgondhgh.0&cacheID=f1ie&Nr=avl:f1

hello bruno

there is not persistence of the session on the radiospare web site

so the link is dead at the end of YOUR session

can you give me the reference of radiospare's screw ?

jacques

Mr. Widget
05-10-2007, 01:37 AM
hello,
before to change the diaphragm, your are oblige to separate the 2420 in two parts
I speak about the four screws which maintains these two parts

sorry but my english is not my first language and I am not very clear

jacquesYour English is fine... it i just a bit confusing because these drivers have three sets of screws. The 1/4-20 screws as Edge mentioned for mounting the horns, the non-magnetic #6-32s for the diaphragms and the four square shouldered rather long ~2" (50mm) machine screws that you need to mount the back cap onto the front half of the driver.

Unfortunately I do not know the name for this type of screw or the size of these off the top of my head. They are a standard machine screw, but are not a particularly common style. I have always ordered them directly from JBL. This is not a realistic option for you. Maybe Guido or another European member has a source for them.


Widget

jacques
05-10-2007, 04:00 AM
Your English is fine... it i just a bit confusing because these drivers have three sets of screws. The 1/4-20 screws as Edge mentioned for mounting the horns, the non-magnetic #6-32s for the diaphragms and the four square shouldered rather long ~2" (50mm) machine screws that you need to mount the back cap onto the front half of the driver.

Unfortunately I do not know the name for this type of screw or the size of these off the top of my head. They are a standard machine screw, but are not a particularly common style. I have always ordered them directly from JBL. This is not a realistic option for you. Maybe Guido or another European member has a source for them.


Widget
yes, that's right (not about my english :-) )
I am looking for the four square shouldered rather long ~2" (50mm) machine screws that I need to mount the back cap onto the front half of the driver.

rs237
05-10-2007, 04:36 AM
i have the same Problem, i found these f*****g screws in my 2441.

regards Juergen

spirou38
05-10-2007, 06:47 AM
hello,
before to change the diaphragm, your are oblige to separate the 2420 in two parts
I speak about the four screws which maintains these two parts

sorry but my english is not my first language and I am not very clear

jacques

Hi Jacques,

You should try Weber métaux in Paris - France

http://www.weber-france.com/Adresse.htm

Bonjour de Grenoble.

jacques
05-10-2007, 08:54 AM
Hi Jacques,

You should try Weber métaux in Paris - France

http://www.weber-france.com/Adresse.htm

Bonjour de Grenoble.

hello,
yes I Know, the shop in paris is weber metaux

but I live in Bordeaux and I don't know the screw's type, that is my problem !

jacques
05-11-2007, 09:13 AM
does someboby hold this information ?



jacques

Earl K
05-11-2007, 09:57 AM
- I just easily threaded some generic 10/32 bolts that I have around here, into the threads of a 2441s' top-plate ( to hold the back-cap in place ) / so I figure they ( 2441 ) must be 10/32 by 50mm long ( 2" )
.. :)

Zilch
05-11-2007, 09:59 AM
#8-32 x 1.5" Phillips-drive Fillister-head.

http://www.smithfast.com/trussrndfill.html

Google "Fillister head" for sources.

Mr. Widget
05-11-2007, 10:04 AM
...so I figure they must be 10/32 by 50mm long ( 2" )
.. :)


#8-32 x 1.5" Phillips Fillister-head.

Maybe 2441 vs. LE85?

I know I have both sets of screws downstairs... somewhere. I have also ordered piles of them from JBL, but I can't seem to find the part number. This can't be that difficult for us regulars. Can't we get this together definitively?

Also... are we sure that all filister head screws will fit into that rather small pocket?



Widget

Earl K
05-11-2007, 10:07 AM
- Secondly; I just threaded some generic 8/32 bolts that I have, into the threads of a 2410s' top-plate ( to hold the back-cap in place ) / so I figure they ( the 2410 bolts ) must be 8/32 by 38mm long ( 1.5" )
.. :)

- I don't have any 2420 (le85s ) .

Zilch
05-11-2007, 10:36 AM
Also... are we sure that all filister head screws will fit into that rather small pocket?The driver is 2420, so I went a pulled a screw from one and measured it.

The dimensional spec for the head is an ANSI standard.

I'm not sure the spelling is, tho.... :p

rs237
05-11-2007, 10:43 AM
i have opened an another 2441 . The screws are 4,7 X 50 mm = 3/16" X 2" . UNF or UNC ?? Perhaps someone has 4 pieces for me ?
Vielleicht sogar jemand hier in Deutschland ?.

regards
juergen

edgewound
05-11-2007, 02:22 PM
2420 (LE85) uses (4) 8-32 x 1.5" Phillips/Fillister head machine screws.

2410 (LE175) uses (2) of the same.

Zilch is right....and so is EarlK.

mech986
05-11-2007, 09:31 PM
#8-32 x 1.5" Phillips-drive Fillister-head.

http://www.smithfast.com/trussrndfill.html

Google "Fillister head" for sources.

Zilch,

thanks for the link. I found another link there that finally explains and pictures all the different machine screw head types that I've read about but could never remember what they looked like. Here's the link:

http://www.smithfast.com/msheadstyles.html


Regards,

Bart

pocketchange
05-29-2007, 05:30 PM
i need 8. Sources mentioned drew a blank... if anyone has a part # from JBL it will be help me out... no end.

.250 phillips head 10-32 X 2"

mbd7
05-29-2007, 06:53 PM
Pocketchange, if you're in the DFW Metromess, check out Elliott's Hardware. They're an old fashioned hardware store that caters to us DIY'ers

pocketchange
05-29-2007, 07:01 PM
I'll give them a call pn the AM. Trouble is finding the #8/.250 head.
I'm thinking of using a cheese head and turning it down to fit. I refuse to cut up the diaphragm cover over a machine screw.
David @ JBL is looking for the correct screws but does not have a part number and I don't either.

100AMPFUSE
05-29-2007, 11:51 PM
Since we are on the subject of screws-bolts,I always wondered what was the name/type of mounting bolts that JBL used to mount the horn to the driver on both 375 and 175(the old stuff),some type of acorn head bolt?what were they made of? can they still be bought?:blink:remember Im a newbe please be kind.

Zilch
05-30-2007, 03:53 AM
Yes, acorn head bolts.

Steel, typically, but also available in brass.

Acorn nuts are more common; combine with short studs for a similar assembly....

caladois
05-30-2007, 04:59 AM
Good luck in your research. I found some screws in a John deer shop !!!!! Go and try !

mech986
05-30-2007, 09:54 AM
Try this number with Dave in JBL Pro Parts. Its a 8/32 x 1.5 long Filister head, Black Torx drive, not the same as original but if the head is the right size, may be a decent sub.


803-02010-24 SCR,8-32 X 1 1/2,FIL,TORX,BLK ZINC,LCS $ 0 .42 USD EA

I couldn't find a pdf for the 2420 showing engineering drawings or part numbers.


Otherwise, contact Smith fasteners above and maybe request a sample?


Regards,


Bart

Thom
05-30-2007, 04:18 PM
In a bind you'd be surprised what you can do to a machine screw head by chucking the screw in a portable drill and holding it to a bench grinder. Should satisfy anyone but a machinist, and unless the machinist wishes to make you better ones, he too should hold his tongue.