2420 Screws

[Bruno GINARD]

Hi all!

I own an old pair of 2420 drivers. Some screw ( back) was exchanged for metrics models!

So, I would like to replace them for original US models, instead of those non-adapted ones.

Anyone could give me the original size ( inch) for the 4 back screws (rear hood) and ones for the diaphragm fixation on the driver ( 3 screws).

In centimeters, the 4 are approximately 41 mm X 4 mm (diameter), and the 3 inside the back chamber, for the diaphragm, are 18 mm X 3.1 mm.


Regards

Bruno

[Guido]

Originally are used

1/4-20 x 1-1/4 FLH Screws.

this is a common screw in the states.

You can go to a screw dealer in France e.g. Wuerth. They should have them.

[Guido]

The screws inside I can not tell you. Sorry.

Are the changed too?

[Bruno GINARD]

Thanks Guido for those informations.

In fact, i suppose there are 3 screws to maintain the 2420 diaphragm. My models have only 1, that's why i need the size ( supposed the previous owner was a poor handyman !)

For the rear chamber, if 1-1/4 is the diameter, how do you translate in equivalent centimeters " 1/4-20 ?


Thanks

[Tom Loizeaux]

Metric screws won't work. Not only will the size be wrong, but the threads will not mesh with the tapped holes. Get "INCH" sized screws!

Tom

[Alex Lancaster]

Unfortunately, I do not have any 1" 24xx out of cabinets, but if I remember correctly, the screw thread might me numeric, (#6, #8, etc.), In about a week I will have a 2410 driver, and I can tell You exactly.

Meanwhile, it might be difficult to obtain them in Yr location, but would be available in UK.

Alex

[Guido]

1/4-20 means
diameter is 1/4 inch (approx. 6mm)
20 is the number auf "windings" on an inch

1-1/4 means the screw is 1 1/4 inch (approx. 3,18cm) long.

I hope this helped.

I got them from German Wuerth. You have Wuerth in France too.

[Fangio]

1/4-20 means
diameter is 1/4 inch (approx. 6mm)
20 is the number auf "windings" on an inch

1-1/4 means the screw is 1 1/4 inch (approx. 3,18cm) long.

I hope this helped.

I got them from German Wuerth. You have Wuerth in France too.

I'm looking for a fistful inch screws to mount the 24xx/23xx combo to JBL monitor baffles. They should have 1/4" x 1-1/4", countersink heads with cross slot, and be black of course. The winding is called UHF here I believe.

Living in a millions city one should think that would be easy to find. But I haven't been lucky yet, inch screws aren't common in the usual screwdealers shelfs here, and not even in internet shops. I've digged through the archives how other europeans solved this and of course - one thread came up. Asked the local Wuerth office but they said no, not available. The only dealer I could find would order at least 100 in UK, for 40€ plus s/h.

Would someone please be so kind to point me to a dealer or direction where these can be had in smaller quantities than 100 these days, lets say 20. Thank you.

[Mr. Widget]

I'm looking for a fistful inch screws....

Would getting bright zinc screws be any easier for you? Remember John's discovery?

http://www.audioheritage.org/vbullet...ad.php?t=11782

If getting any inch screws is a problem, let me know by PM and I'll send you a fist full of 1/4-20s.


Widget

[Fangio]

Perfect, thank you very much. And

[4313B]

Speaking of nuts, bolts, screws, washers; Another option may be to see if these guys have what you want. I don't shop around much and usually just get on their website and order a hundred or so of whatever I need.

Aaron’s General Store

[Alex Lancaster]

Also, forget about the 1/4" screws or bolts suggested previously, those would be for mounting the driver to the horn, and 1 1/4 is too long.

Alex

[Guido]

@ alex

The screws I recommended to Bruno are for the mounting of the 2307 Horn to the baffle.

It's taken from:

http://www.jblproservice.com/pdf/Stu...ries/4333B.pdf

Maybe I didn't get the problem right, Sorry

[Alex Lancaster]

Guido:

I see, but originally it said "screws or bolts" ON THE "back", as for the baffle board mounting, it could be just about any thread depending on the cabinet.

For the driver to horn bolts, I use grade 5, 1/4" NS by 3/4 or 1" long, depending on the horn.

I had to grow up on a "metric" country, where until a few years ago, the only places to get metric hardware were the VW and Renault dealers.

Alex

[Earl K]

Hi Bruno

For a 2410;

The 3 screws ( machine bolts ) for the diaphragm are #6-32 by 3/4" long ( or @ 19 mm long )

The 2 screws ( machine bolts ) for the back-cap are #8-32 by 1.5" long ( or @38 mm long )

For a 2420/1; Don't have one to measure

For a 2426;

The 3 screws ( machine bolts ) for the diaphragm are #6-32 by 3/4" long ( or @ 19 mm long )

The 3 screws ( machine bolts ) for the back-cap are #8-32 by .5" long ( or @ 13 mm long )

The bolts that hold in the diaphragm should be nonmagnetic ( brass ) - if you can find them .

regards <> Earl K