Looking for long threads

[Big Shed]

I have been trying to get hold of some long threads with countersunk phillips head in 4"x1/4" Whitworth (some places call these set screws)

I can get them up to 2 1/2" long, but I haven't found any 4" long.

Any ideas out there?

[snowyskiesau]

Fred,

Have you had a look at Bolts and Industrial Supplies?

I had success with them recently when I was looking for very small metric screws.

[Big Shed]

Fred,

Have you had a look at Bolts and Industrial Supplies?

I had success with them recently when I was looking for very small metric screws.

Just had a look there, they have hex head 1/4" set screws up to 3". Can't find any c/s set screws.

Even M6 only to 75mm and in hex.

[neksmerj]

BS,

If hard pressed, you could weld the appropriate head onto some 1/4" allthread.

Wouldn't look pretty, but might do the job.

As an after thought, you can purchase M6 furniture screws, however, they have a flat head with a socket head. I think Cornall's have them in West Heidelberg.

Ken

[Grahame Collins]

Hi,
I believe that it would not be excessively hard to fab up a 4" bolt. If you have acess to a mig, it is easier of course,due to the quick tacks and small volume deposited.

The socket which I would make around 4mm diameter will keep alignment if you don't dawdle beteween opposed tack welds.

After that machine flush to major thread diameter and run a die up the thread while still in the lathe.

I have used the same welded socket system with a draw bar from the school HM mill ( the kids get confused with "loosen a turn or two, strike sharply with soft hammer" but they use - unscrew all of the way out of the female thread and beat the shot out of it- which makes the thread cactus.)

You can hold the thread ok in a chuck jaw with a threaded mandrel.

If you go this way and have any more probs maybe I can help.

Grahame

[Big Shed]

Ken and Grahame, two problems with the welding suggestion.

1 I haven't got a welder

2 Can't weld for shyte

Also, far too much work involved for what I want to do.

At the moment I am buying hex head 1/4" Whitworth bolts and machining the hex head to 60deg c/s. I also have to machine the length of the bolt slightly as they don't fit properly in the expanding pen mandrels these go in, drilled to 6mm all the way through, then reamed to .250". The long thread fits very nicely without machining, except for turning down the c/s head to the dimension of the expanding mandrel.

[old_fella]

Can you buy a normal style one which doesnt have the thread the entire length and run a die over it the full length giving you the set screw style

[Bryan]

I like Grahame's idea, but without the welding. Make it a screw-on head. Loctite is your friend.

[Gavin Newman]

Is it important that the bolt head be flush with the end of the mandrel? If not, why could you not use a standard bolt but machine up a tapered washer to go under the head?

[Big Shed]

Is it important that the bolt head be flush with the end of the mandrel? If not, why could you not use a standard bolt but machine up a tapered washer to go under the head?

Yep

[mike48]

Blackwoods had screws listed as cat no 0632 2711 in their 2006 printed catalog as Ajax slotted CSK 1/4 x 4 inch but only in 304 stainless.
Sidney Cooke apparently only made 1/4 BSW CSK slotted metalthread screws up to 3 inch length.
What about using an old imperial CSK masonry anchor, as the shank is quite long?
Ramset made CSK slotted head in 1/4 shank to over 4 inch overall length.
Does it need to threaded overall?
Make it.

cheerio

[wm460]

you could try Coventry Fasteners on South Rd Adelaide.

Coventry Group