7050E Rivet Heat Treatment

[Rob130]

I have come upon some conflicting information on the E rivet. TO 1-1A-9 Aerospace Metals Manual pg.3-20 para f. states D/DD/E rivets can be kept refrigerated at -10 degrees
and must be driven within 30 minutes.

I was under the assumption that the E rivet did not require any special handling after they are initially heat treated.

Any information on the proper use and handling of E rivets would be appreciated.


Thanks, Rob

 

[rerig]

That requirement is for the DD, "Icebox Rivets" only.
The D & E rivets are not kept cold.

Normally, the E rivets will substitute for the DD rivet.
But it is a very hard rivet and is usually squeezed, not shot.

Consult the SRM for allowable DD rivet substitutions.
I don't know about the T.O., I'm commercial.

rerig.

 

[djfordz]

Could someone give me a reference for the general substitutions of dd rivets with e rivets.

I'm working on a Gulfstream part and there SRM is extremely vague.

I'm hoping to find a general reference of acceptable fastener substitutions to put in the DER.

 

[SuperStress]

Depending upon what your requirements are, you may just be able to reference the rivet strengths from MIL-HDBK-5J.

Table 8.1.2(b) on page 8-13 gives the single shear strength of DD rivets as 41 ksi versus 43 ksi for E (aka KE) rivets.

Assuming you have no other concerns (temperature, corrosion, fatigue), that should suffice as a reference for static strength applicability.

SuperStress

 

[Stache]

When I worked for the DOD I used to install several hundred DD rivets each day. From a maintainer’s point of view the DD rivets should be kept at –40 degrees until installed. I used to keep them on dry ice after removing from the freezer. Second make sure they are reheated treated if warmed to room temperature. The DD rivets will show sign of cracks in the shop head if the rivet is allowed to warm before installing. Having the rivet pre-cut to length is a good shop practice. If a maintenance person cuts the rivet prior to installing it will sometimes crack when installed. Maintenance folks will not tell anyone this because it is hard to install them in the larger sizes 3/16 and up.

The other problem is supply of E rivets we could not get them, however DD are very common.

Denny