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09-04-2016, 10:58 AM
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Join Date: Mar 2015
Location: Bonney Lake, WA
Posts: 71
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Degree countersink #10 screws
Having trouble finding this answer.. Which countersink do I need for the #10 screws on the rudder? Is it 82 degrees, or a 100 degree rivet countersink? On that note, what would the 130/120 countersink so be needed for?
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PP ASEL/A&P
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09-04-2016, 11:29 AM
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Join Date: Nov 2005
Location: Davis, CA
Posts: 1,156
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Quote:
Originally Posted by Brettc
Having trouble finding this answer.. Which countersink do I need for the #10 screws on the rudder? Is it 82 degrees, or a 100 degree rivet countersink? On that note, what would the 130/120 countersink so be needed for?
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The #10 screws have 100 degree heads, the countersunk pulled rivets used on our RVs typically have 120 degree countersunk heads, though in the latter case I believe Vans mentions just using a 100 degree dimple or cutter for them, in the build instructions.
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Lars Pedersen
Davis, CA
RV-7 Flying as of June 24, 2012
960+ hours as of June 30, 2020. Where did the time go?
Last edited by Lars : 09-04-2016 at 06:00 PM.
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09-04-2016, 11:55 AM
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Join Date: Mar 2015
Location: Bonney Lake, WA
Posts: 71
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Thanks!!! Placing an order then.
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PP ASEL/A&P
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09-04-2016, 11:59 AM
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Join Date: Apr 2006
Location: Vancouver island, BC Canada
Posts: 385
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AN426 rivets have a 100 degree head.
From our bible:
"e. Countersunk head rivets MS20426
(supersedes AN426 100-degree) are used on the exterior surfaces of aircraft to provide a smooth aerodynamic surface, and in other ap- plications where a smooth finish is desired. The 100-degree countersunk head has been adopted as the standard in the United States."
You might be thinking of pulled rivets.
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Jim Green
RV7 tip up
IO360 Whirlwind 200RV
Last edited by jimgreen : 09-04-2016 at 12:01 PM.
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09-04-2016, 12:10 PM
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Join Date: Jan 2005
Location: Bellevue, NE
Posts: 524
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The only "oddball" countersink on the Van's aircraft is for the CS4-4 pulled, countersunk rivets. Those are 120 degrees.
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Bob
RV-10 builder x2
RV-7A under construction
EAA Tech Counselor
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09-04-2016, 02:10 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,761
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"AN" solid rivets and "AN" screws have 100? heads.
Pulled rivets typically have 120? heads.
Non-aircraft screws typically have 82? heads.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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09-04-2016, 02:54 PM
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Join Date: Mar 2015
Location: Bonney Lake, WA
Posts: 71
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Quote:
Originally Posted by Mel
"AN" solid rivets and "AN" screws have 100? heads.
Pulled rivets typically have 120? heads.
Non-aircraft screws typically have 82? heads.
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Thanks! I was lookin in the manual before I ordered a countersink. Yard store has like 4 different degrees of the same countersink. I appreciate the help
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PP ASEL/A&P
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09-04-2016, 06:01 PM
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Join Date: Nov 2005
Location: Davis, CA
Posts: 1,156
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Argh. I should type what I'm thinking, instead of what my fingers were saying. "Countersunk pulled rivets" is what I meant. Previous post edited.
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Lars Pedersen
Davis, CA
RV-7 Flying as of June 24, 2012
960+ hours as of June 30, 2020. Where did the time go?
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