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[ronnyd]

Plenty of tapping compound, (Rocol or something nice and gooie like that).....

Can you use tapping compound on a die? 

Of course, just brush it on  the unthreaded part of the bolt and do 1/4 turn at a time. Spent most of my working life doing crap like that.

When do you turn back to break the swarf?   
I was always taught halfvturn forwards & quarter back

What ever floats your boat.

[Rods2]

I wish I had some idea of what the hell this was all about . . . screwing or something ?

Hello, Rog, who woke you up?

Didn't take STEMO very long to pop up in this thread once he saw the keywords of boats & screwing, to say: Hello Sailor!

[Mister Rog]

I wish I had some idea of what the hell this was all about . . . screwing or something ?

Hello, Rog, who woke you up?

I poke my nose in for a look now and again.

[Lizzie Zoom]

I wish I had some idea of what the hell this was all about . . . screwing or something ?

Hello, Rog, who woke you up?

I poke my nose in for a look now and again.

No Rog, that applies to the "69" thread!!

[Mister Rog]

I wish I had some idea of what the hell this was all about . . . screwing or something ?

Hello, Rog, who woke you up?

I poke my nose in for a look now and again.

No Rog, that applies to the "69" thread!!

That's when you really tell the difference between Andrex and cheaper brands 

[Lizzie Zoom]

I wish I had some idea of what the hell this was all about . . . screwing or something ?

Hello, Rog, who woke you up?

I poke my nose in for a look now and again.

No Rog, that applies to the "69" thread!!

That's when you really tell the difference between Andrex and cheaper brands 

 

[biggriffin]

 I use to get bag fulls of stainless nuts/bolts washers from Aberdeen, never once had a problem with delivery,or quality, https://www.grampianfasteners.com/

[TheBoy]

...despite me checking the thread length with a useless egay seller, they have sent me some bolts with insufficient thread on.

 .....

What size did you want? And did you want hex headed bolts or set screws or cap head bolts or cap headed set screws? But we dont have a massive selection .....

M5 x 100mm.  But it needs to have 60mm thread on it as there are bolts in the middle to clamp one half of the contraption, and then more bolts further down to (separately) clamp the other half of it.

Bolts I was sent have about 20mm thread, so I need to cut 40mm of thread in each of 5 bolts, with a Machine Mart tap&die set.

[biggriffin]

Like these..
  https://www.tcfixings.co.uk/main/product/productinfo/7736/M5x100-Socket-Cap-Head-Screw-12.9-BZP/1

Know there bzp, but stainless available.

[TheBoy]

Like these..
  https://www.tcfixings.co.uk/main/product/productinfo/7736/M5x100-Socket-Cap-Head-Screw-12.9-BZP/1

Know there bzp, but stainless available.

I'm told it has to be A2, and that doesn't spec thread length

[Doctor Gollum]

Southampton Boat Show in a couple of weeks... Going so can have a look if required 

[Nick W]

Like these..
  https://www.tcfixings.co.uk/main/product/productinfo/7736/M5x100-Socket-Cap-Head-Screw-12.9-BZP/1

Know there bzp, but stainless available.

I'm told it has to be A2, and that doesn't spec thread length

I think you're going to struggle to buy an M5x100 bolt with a 60mm thread length. I also think if you do find such a thing you'll have to be very careful not to break them, especially if stainless.

[dave the builder]

you can get  A2 STAINLESS STEEL all THREADED RODS M6 X 1000MM 5 PACK from screwfix £12.69
I use it as part of my rotary drum water filtration system and it's not rusted
m5 is an odd size to use for long bolts
is it that critical to use m5 ? weight issue ?

[biggriffin]

Like these..
  https://www.tcfixings.co.uk/main/product/productinfo/7736/M5x100-Socket-Cap-Head-Screw-12.9-BZP/1

Know there bzp, but stainless available.

I'm told it has to be A2, and that doesn't spec thread length

Get in touch with Grampian fasteners, everything they do is suitable for the oil industry, in the North sea so a very tough environment, and is also suitable for the food industry

[Andy B]

...despite me checking the thread length with a useless egay seller, they have sent me some bolts with insufficient thread on.

 .....

What size did you want? And did you want hex headed bolts or set screws or cap head bolts or cap headed set screws? But we dont have a massive selection .....

M5 x 100mm.  But it needs to have 60mm thread on it as there are bolts in the middle to clamp one half of the contraption, and then more bolts further down to (separately) clamp the other half of it.

Bolts I was sent have about 20mm thread, so I need to cut 40mm of thread in each of 5 bolts, with a Machine Mart tap&die set.

So you need/want a set screw ie a 'bolt' that is threaded for its whole length 

You'll probably end up with a bolt favouring a dogs leg if you cut that much thread with a MM die 

I'm not back in work till the week end but I'll look to see what we have