For universal head rivet and countersunk rivet which type of symbols r used in aircraft part drawing?

Question

for universal head rivet and countersunk rivet which type of symbols r used in aircraft part drawing to show blind rivets and solid rivets

Answer 1

On the body of the blue print (print), there will be a symbol to show location.

A plus sign (+) with a circle in the middle will indicate attachment that is on that particular drawing.

A "+" with a missing section in the center indicates a location duplicated from a preceding view.

A circle drawn with dashed lines indicates an attachment called out on another print.

A "+" drawn with dashed lines, and a circle in the middle indicates an attachment lies under existing structure.

By the attachment on the drawing, there should be a symbol, another "+", with a code in the upper left quadrant. This is referenced to the "General Notes", where there will be a legend for the codes.

A few examples: A "XES" in the upper left is a S4931313C6 PIN, with a NAS1252-10L WASHER, and a MS21042L3 NUT.

An "M" would be a 3D0282E6 RIVET.

A "T" would be a3D0240-6 Blind Fastener,  Etc.

The upper right quadrant indicates attachment diameter, in 1/32". Example: "3" would be a 3/32 dia attachment, "4" would be 1/8 (4/32), a "5" would be a 5/32, a "6" would be a 3/16 (6/32), etc.

The bottom left, if it has anything written in it, would be either a "F" or a "N", to desiginate that the attachment head goes either on the FAR side (the side facing away from you on the view of the print), or the NEAR side (the side closest to you in that view of the print). Usually, this isn't used, but left up to the discression of the mechanic/assembler. It usually IS used with a bolt for rigging (example, so the head of a bolt going through a torque tube on a door mechanism doesn't rub the structure as the tube rotates), or with rivets when proper orientation is needed for purposes of sealing something against leakage (such as rivets going through a fuel tank).

The lower right quadrant, if it has anything in it, will be a "C", to indicate that the butt side of the rivet is to be countersunk,(such as a double flush plug) for the NACA method (82 degrees, rather than the 100 degrees for under a manufactered head).

As far as countersinking or not under the head of an attachment, that should be covered in the "process standards", under the "hole preparation" section. Common sense dictates that a flush head attachment needs a countersink, a universal head attachment doesn't.