The rivet heads shall be of any one of the form(shown in
sketch (1) Appendix H-4) given below:
1. Snap head.
2. Ellipsoidal head.
3. Pan head.
4. Conical head.
5. Round countersunk head.
6. Pan head with tapered neck.
7. Steeple head.
8. Countersunk head.
The dimensions of these rivet heads shall conform to the proportions
indicated in the sketch.
The Chief Inspector may, at his discretion, accept any slight
variation in the proportion of these dimensions and forms.
Tolerances on shanks
The tolerances on the diameters of the shanks measured at position
XX, YY, ZZ shown in sketch
2,Appendix H-4 shall be within the
limits given in table below:-
Diameter of Shanks
position as shown in Sketch-2 Appendix H-4
from rivet head or end
rivets 5D and below in length
||For rivets over 5D in length
||D + 1/64
||Rivet holes shall not be punched,
but shall be drilled full size from the solid plate, and
wherever possible rivet holes shall be drilled in place
with plates, straps and ends bolted in position. After
drilling the plates shall be separated, the burrs and
the sharp edges of the holes shall be removed and the
contact surfaces of the plates shall be cleaned. All tacking
holes shall be drilled to a size which will allow the
holes to be enlarged to the required rivet size by drilling
or reaming. All rivet holes shall be slightly countersunk
under each rivet head.
||The diameter of the rivet hole
shall be not more than 1/16 inch larger than the standard
diameter of the cold rivet as manufactured.
||Where sizes of rivets are mentioned
the sizes refer to the diameters of the rivet holes not
to the diameters of the rivets used before closing.