Norma "Cobra" threadless hose clamps

[rankamateur]

Does anyone use these, and know of an Australian source of supply?

 

 

[Head in the clouds]

Google is your friend - Normaclamp

 

 

[rankamateur]

More interested in the anyone use them so I can use a tried supplier, Autopartswholesale comes up in SA on google. I have two on a Silvan spray hose and thought they might have other potential in tight spots. Every time I run over my hose the clamp has to come undone to replace the fitting, and they have proved very reliable and reusable in that pressure application.

 

 

[facthunter]

It only goes to the one position so the size of the clamp would be more critical than a worm drive or spring tensioned fitting. I use Stainless "Tridon" because they are flexible and adapt to out of round applications. Nev

 

 

[kgwilson]

I have used them for my fuel line fittings and they come in the specific size for the hose. I got them along with the 1/4" fuel line at Pirtek. The clamps are 12-13mm Cobra stainless steel & are used in conjunction with 1/4" brass nipples & other standard 1/4" shutoff valves & facet fuel pumps etc. When they are on they are really tight. They can't be re-used if you have to get them off as you generally mangle them in the process of removal. At $1.50 a piece that isn't an issue though.

 

 

[rankamateur]

I have used them for my fuel line fittings and they come in the specific size for the hose. I got them along with the 1/4" fuel line at Pirtek. The clamps are 12-13mm Cobra stainless steel & are used in conjunction with 1/4" brass nipples & other standard 1/4" shutoff valves & facet fuel pumps etc. When they are on they are really tight. They can't be re-used if you have to get them off as you generally mangle them in the process of removal. At $1.50 a piece that isn't an issue though.

Do you have the right pliers or do you mangle them anyway? I only used a small screwdriver to lift the catch on mine and have re-used them about four times.

 

 

[Jabiru Phil]

Most irrigation company's sell Cobra clamps. The size of the hose and fitting is critical for a correct fit.

 

I personally would not use for aircraft. We do sell thousands in the low density poly applications as apposed to the nearly obsolete plastic cray clamp due mainly to uv failure.

 

The correct application tool is about $30 ea.

 

Hope that helps

 

Phil

 

 

[rankamateur]

Most irrigation company's sell Cobra clamps. The size of the hose and fitting is critical for a correct fit.I personally would not use for aircraft. We do sell thousands in the low density poly applications as apposed to the nearly obsolete plastic cray clamp due mainly to uv failure.

The correct application tool is about $30 ea.

 

Hope that helps

 

Phil

Phil

 

Why wouldn't you use them on an aircraft, do you have a particular concern? They don't seem to bite into the outer part of the hose like stainless threaded clamps, I was considering them for radiator and fuel hoses, I was looking into the correct sizes to order, given that there are no sharp ends sticking out and no worm drive to fit in confined spaces I thought they might be just the job.

 

 

[Jabiru Phil]

PhilWhy wouldn't you use them on an aircraft, do you have a particular concern? They don't seem to bite into the outer part of the hose like stainless threaded clamps, I was considering them for radiator and fuel hoses, I was looking into the correct sizes to order, given that there are no sharp ends sticking out and no worm drive to fit in confined spaces I thought they might be just the job.

RA

 

These are seriously great clamps, but as stated unless you have the EXACT fit the hose blows off, happens all the time in the field.

 

I would use Super Clamps if a more secure fit is required. They are a bronze colour with nuts instead of screw driver to tighten

 

Phi

 

 

[Head in the clouds]

I favour T-bolt clamps personally, and wire clamps are good too if not over-tightened. Both provide even ring-pressure. Admittedly they don't address the low-profile issue Rank is after.

 

 

 

[facthunter]

The thin stainless worm drive ones can be opened up easily and threaded over a pipe, and they have no bulk except where the worm is.. I find the wire ones cut into the rubber too much nev

 

 

[kgwilson]

Do you have the right pliers or do you mangle them anyway? I only used a small screwdriver to lift the catch on mine and have re-used them about four times.

They are re-usable but I haven't. I put them on with a pair of needle nose pliers as I don't have the correct tool. I did one as a test initially & buggered it taking it off hence my comment. What I like about them is that they have a very positive clip action, the clamp is very tight (must use the exact size though) are stainless steel and are low profile so they don't catch on anything & can't loosen.

 

 

[rankamateur]

RAThese are seriously great clamps, but as stated unless you have the EXACT fit the hose blows off, happens all the time in the field.

I would use Super Clamps if a more secure fit is required. They are a bronze colour with nuts instead of screw driver to tighten

 

Phi

Thanks Phil

 

I use superclamps on five inch layflat to feed my irrigation system but the aren't very tractable in small water and fuel hose sizes, they would get a bit cumbersome around an engine installation I think.

 

The best approach to getting the right size fit might be to back off a worm drive clamp on an existing installation and put the calipers on the hose where it is already installed, all the fuel hoses should use the same sized stem for each application.

 

The can't work loose aspect is just as important to me as the compact design. Steve...