EN 2544-1987 pdf download.Aerospace series Representation of rivets on drawings for aerospace equipment.
This EN 2544 specifies the representation of rivets on drawings for aerospace equipment.
2 General
The representation of rivets on drawings shall conform to one of the following two methods:
— either by conventional drawing of the rivets. This method is more particularly suitable for drawings containing a small number of rivets, or when the use of symbols does not offer all the safeguards for understanding.
or by the use of symbols. This method is more specially suited for drawings containing a large number of rivets and is covered by the following clauses of this standard. It shall meet the requirements arising from microcopying and reproduction of drawings.
3 Presentation of symbols
The reference of this standard shall be quoted in all drawings containing rivets by this symbol method.
3.1 Symbols for a set rivet
A set rivet is indicated by a cross.
The quadrants of the cross contain the information regarding rivet and rivet assembly. See next paragraphs.
3.1.1 Indications in upper left hand quadrant The following appear in this quadrant:
— letter R. indicating that the cross represents a rivet1.
— the numerical reference allocated to the rivet in the definitions parts list of the drawing or in a table
on the drawing giving the necessary information for definition of the rivet (head form, material,
diameter, length, surface treatment ).
3.1.3 Indications of lower left hand quadrant
3.1.3.1 countersink
A countersink shall be indicated by an equilateral triangle orientated as follows in the quadrant:
— V for the near side
— for the far side
If this countersink appears clearly on the drawing, indication by a triangle is unnecessary.
If the countersink angle is 1000, the triangle is sufficient. If the countersink angle is other than 1000. the value of the angle is placed on the right of the triangle.
3.1.3.2 Dimpling
Dimpling shall be indicated by a V symbol orientated as follows in the quadrant:
— V for the near side
— A for the far side
If this dimpling appears clearly on the drawing, indication by V symbol is unnecessary.
If the dimpling angle is 1000, the symbol is sufficient. If the dimpling angle is other than 1000, the value of
the angle is placed on the right of the symbol.
If several sheets are dimpled, their number precedes the symbol
3.1.3.3 Combined countersink and dimpling
The combination of a countersink and a dimpling shall be indicated by V symbol and an equilateral triangle
The orientation of these symbols and the angle indication shall conform to paragraph 3.1.3.1 and 3.1.3.2.
If appropriate, the angle shall be quoted after those symbols.EN 2544-1987 pdf download.

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