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Rivets, Buck Type, Preparation for and Installation of

3.2 Preparation for installation. 
3.2.1 Rivet holes. 
3•2• Oversize, oblong and irregular-shaped holes shall 
be cause for rejection. Rivet Fnles shall be drilled in accordance with 
the following requireænts• 
a. All holes shall be drilled (at 90 degrees) to the working 
surface. 
Extrene pressure shall not be applied and holes shall not be 
b. 
punched through with the drill. 
C. "hen drilling through than one sheet, hold the sheets 
securely together so there is no misalignment of holes due to shi fting 
Or spearation of the sheets. 
Piercing tools which produce true and clean 
holes, equivalent to acceptable drilled holes rruy be used. Piercing 
tools shall not be used wi thout written approval from the procurin activity. 
If piercing is used. all holes shall be inspected for radidl crac ing. 
3.2.1.3 Hole size. Hole size for rivets shall conform to Table I 
unless otherwise specified on the engineering drawing or specification. 
3.2.1.4 Countersinking. Countersinking shall be used in the 
Installaton rivets. Countersinks shall be produced 
with a tool that incorporates an automatic stop countersinking feature. 
(he countersinking tool shall be held at 90 degrees to the work surface 
during the entire cutting cycle. Countersinks shall be free of 
chatter nürks and concentric with the rivet holes. The countersink 
diamter shall be in accordance with Table VI unless other-wise specified 
on appl icable engineering drawings or specifications. 
3.3 Installation. 
3.3.1 Cleanin matin surfaces. Before parts are riveted together. 
all chips, shall be remved from the mating 
Bur.'S ruy be remved from rivet holes by chamfering to a depth 
surfaces. 
not to exceed 10 percent of the stock thickness, or 0.032 inch, whichever 
is less. Disassenbly after drilling and before riveting. in order to 
deburr faying surfaces, shall not be required.