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Old 11-06-2011, 09:35 AM   #15
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Originally Posted by Wooden Rivet View Post
Can anyone tell me the correct size drill for buck rivets on an Airstream?
Tom
# 30 drill bit for 1/8 inch holes.

# 21 drill bit for 5/32 inch holes.

# 11 drill bit for 3/16 inch holes.

Some use a # 20 drill bit for the Olympic rivets.

That is "WHY" they will, in time, leak.

Andy
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Old 11-07-2011, 06:22 AM   #16
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Tom, If you're going to replace the original bucked rivets; the closest resembling commonly available rivet is the MS20470AD5-# then use a #20 drill bit. For Cherry, CherryMax, Olympic or Pop style I use #20 but if you want to be 100% sure you are using the correct bit use that which the rivet manufacturer specifies.
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Old 11-07-2011, 10:19 AM   #17
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Tom, If you're going to replace the original bucked rivets; the closest resembling commonly available rivet is the MS20470AD5-# then use a #20 drill bit. For Cherry, CherryMax, Olympic or Pop style I use #20 but if you want to be 100% sure you are using the correct bit use that which the rivet manufacturer specifies.
A 1/8 rivet is .125 inches. The # 30 is .1285 inches.

A 5/32 rivet is .15625. The #21 is .159 inches.

A 3/16 rivet is .1875. The # 11 is .191 inches.

The smallest hole should be used whenever possible.

However, here of late, the Olympic rivets seemingly have gone "nuts".

Their rivet head, while still meeting their specs, is some what smaller. And, the body is .154 inches.

Using a # 21 drill bit, then gives a .005 inches of clearance.

Using a # 20 drill bit, gives a .007 inches of clearance.

Again, the smallest sized hole should always be used. It minimizes looseness as well as water leaks.

Using washers on Olympic rivets is an absolute "NO NO".

Why, is easy.

The washer in time, hardens and then falls off. Results, because of that, is a water leak for every one of those washers that fall off.

Then the hair pulling and fun, really starts, not to say what the leaking water may have ruined.

Andy
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