Question

O De JUicralIR ed to a maximun of 20 percet of the rivets, or 10 rivets in a single rivet pattern, whichever is less. Repairs to more than two adjacent oversize rivets, or replacing more than half the rivets with oversaze rivets in any 10 inch length of pattern is prohibited. TABLE I Hole Size, Standard Rivets Hole Diameter Limits Rivet Diameter (inches) Recommended Drill Sizes Minimum Maximum 1/16 #51 (0.067) 0.062 0.072 3/32 #40 (0.098) 0.093 O.103 1/8 # 30 (0.128) 0.125 0.135 #21 (0.159) #20 (0.161) 5/32 0.156 0.171 #11 (0.191) #10 (0.194) 3/16 0.187 0.202 7/32 #1 (0.228) 0.218 0.233 1/4 F (0.257) 0.250 0.265 9/32 L (0.290) 0.281 0.296 5/16 0 (0.316) 0.312 0.327 11/32 S (0.348) 0.343 0.358 0.375 0.390 3/8 V (0.377) 13/32 Z (0.413) 0.406 0.421 TABLE II Minimum Flattened Dimension of Manufactured

What is the explanation for determining to use a #20(.161) when 5/32 rivet diameter is called out on a blueprint?

Answer 1

5/32 diameter rivets means 5/32 = 0.15625 inch nominal dia.

for getting a successful rivetting , we use a drill of size # 20 (0.161 inch) . As this provides a bit bigger hole which ensures easy rivetting.