the shop. Burrs resulting from reaming shall be removed. The
threads of bolts shall be entirely outside of the holes. The body
diameter of bolts shall have tolerances as recommended by ASME B4.1
for the class of fit specified. Fitted bolts shall be fitted in
reamed holes by selective assembly to provide an LN-2 fit.
(3) Holes for high strength bolts shall have diameters of not
more than 2 mm 1/16 inch larger than bolt diameters. If the
thickness of the material is not greater than the diameter of the
bolts the holes may be punched. If the thickness of the material
is greater than the diameter of the bolts the holes may be drilled
full size or subpunched or subdrilled at least 3 mm 1/8 inch
smaller than the diameter of the bolts and then reamed to full
size. Poor matching of holes will be cause for rejection.
Drifting occurring during assembly shall not distort the metal or
enlarge the holes. Reaming to a larger diameter of the next
standard size bolt will be allowed for slight mismatching.
2.2.3.2
Bolted Aluminum Connections
Punching, drilling, reaming and bolting for bolted aluminum connections
shall conform to the requirements of AA ADM1, Section 6.
2.2.4
Riveted Connections
2.2.4.1
Riveted Structural Steel Connections
a. Rivet Holes - Rivet holes shall be accurately spaced, cylindrical
and perpendicular to the member. Countersinking shall be true and
square with the hole. Rivet holes shall be 2 mm 1/16 inch larger than
the diameter of the rivet. If the thickness of the material is not
greater than the diameter of the rivet the holes may be punched full
size. If the thickness of the material is greater than the diameter of
the rivet the holes shall be drilled full size or subpunched or
subdrilled at least 3 mm 1/8 inch smaller than the diameter of the
rivet and then reamed to full size in accordance with the following
provisions unless otherwise specified or authorized. For shop
connections rivet holes may be drilled full size if the component parts
to be riveted are welded, bolted or clamped together before drilling of
rivet holes. For field connections the holes required to be subpunched
or subdrilled shall be reamed in the shop if the work is assembled and
matchmarked in the shop. For field connections not assembled in the
shop the holes required to be subpunched or subdrilled shall be reamed
in the field after the work has been assembled and bolted together.
(1) Punched Holes - Punching shall be accurate. The diameter of
the punch shall be not more than 2 mm 1/16 inch greater than the
diameter of the rivet. The diameter of the die opening shall not
be more than 2 mm 1/16 inch greater than the diameter of the
punch. Holes shall be clean cut without torn or ragged edges.
(2) Reamed and Drilled Holes - Reaming and final drilling shall
be done with the component parts of the member assembled and
firmly fastened together. Drilling shall be done with twist
drills. Reaming shall be done with short taper reamers having not
less than four flutes. Reamed holes shall be made smooth by the
reamer touching the entire circumference of the hole. Outside
burrs on reamed holes shall be removed to the extent of making a 2
mm 1/16 inch chamfer.
SECTION 05055A
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