OT-Aircraft, pin-rivet, threaded ? ? ?

Hi Guys,

If there are aircraft fastener specialists out there, what is a "pin-rivet, threaded" used for and how is it installed?

Thanks,
John

Post a part number or a picture.

Sounds like the standard nomenclature that gets assigned to stuff into the NSN system by people that don't have a clue what it is.

You are gonna have to come up with some specifics of the fastener, to get useful info, but it sounds like it could be the description of a HiLock or similar interference fit fastener. Or something as simple as a drive rivet.

Cheers
Trev

"pin rivet" is short for "drive pin rivet". A drive pin rivet has a hollow core with a pin down the shaft. The end of the shaft is narrowed so when you hit the pin it expands. You can drive pin rivets with hammers, nail sets, anything that can cause a pin to move forwards. There are machines that will do it automatically and at high speed.

A threaded drive pin rivet is a drive pin rivet that has an external threaded stud protuding from the top so after you set the rivet the stud is there to accept a fastener. Typically these are used when you need to mount something to a thin wall. You drive in the rivets. Hang the appliance on the studs and then use nuts to secure the appliance.

PS I wouldn't advise setting rivets on an aircraft with a hammer. Working on aircraft properly requires expensive, specialized tools and training for many operations. Doing a handyman special on an aircraft is dangerous and possibly illegal. If you make a mistake you could kill the pilot and his passengers.

Mornin'

Thanks for the info. I was able to get the NSN number and look it up from there.

Bizarre fastener. It is basically like a carraige bolt without the square section at the base of the shank under the head.

Instead, it has a hex recess, not in the head like a button head screw, but in the opposite or threaded end. Apparently it goes through a round hole and you tighten with a nut and keep the fastener from turning with an Allen wrench inserted into the threaded end.

Seems like you'd need three hands to assemble.<LOL> No wonder aircraft mechanics get the big bucks........

Thanks,
John

Sounds like a standard Hilock to me.

Racebrewer said:

Apparently it goes through a round hole and you tighten with a nut and keep the fastener from turning with an Allen wrench inserted into the threaded end.

Click to expand...

It requires a special collar rather than a nut.

The collars come in two flavors and are aluminum. They have a hex head and are scored so that the hex breaks off at a specific torque.

There are pneumatic tools to install them as well as 1/4 drive ratchets with a hole bored through them to accommodate the hex key.

If tightened using a wrench, use a six or twelve point box type wrench as the collar will break away prematurely if tightened with an open type wrench.

Can someone post a picture of this thing? It sounds interesting.

Perfect. That's what I was dealing with.

Much appreciated,
John

If you are installing these correctly, the hole size is critical to the strength of the assembly.

Depending on the particulars of the part number, it may have a slightly enlarged section of the shank, or just a very carefully sized parallel side to it. But in any case, the hole size is usually reamed to a decent tolerance, and sometimes cold worked.

The key is used to stop it from turning as it begins it's trip down the hole. Once in the hole, if the hole is correctly sized, the fastener should not rotate.

The tolerances for the hole will be specific to the specific type of fastener you are dealing with, but for non-aircraft, non-critical fastenings, a reasonable interference fit is what is required. Not so critical if using a regular nut, but if using the proper collars, too tight a fit will cause the collar to break before the pin is seated. Not so good.

Cheers
Trev

and Pan American Tool has a large stock of stepped reamers for them as well as other aerospace related stuff..

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