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  #1  
Old 12-03-2014, 02:04 AM
VPYVO VPYVO is offline
 
Join Date: Sep 2011
Location: Melbourne Australia
Posts: 51
Default Which bolts for silverhawk fuel servo to FAB?

Hello all I have searched here and on the net without success.
These bolts were not supplied in any of my kits.
The vans kit has no callouts.(different servos?)
Silverhawk manual says the holes are .250-20 UNC-3B Helicoil thread. Vertical induction of course with the fab

What is the an or mil spec? For the bolts.

I have read the posts re different issues with the FAB. Looking for the bolt and nut size in particular and any methods used to ensure it stays put.
Thanks in advance
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RV7 VH-RRA flying Sept 2017
Sept 2019 180 hours
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  #2  
Old 12-03-2014, 07:24 AM
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jdeas jdeas is offline
 
Join Date: Mar 2006
Location: SoCal
Posts: 626
Default Same as RSA5?

I believe that would be standard (grade 5 or better) 1/4-20 bolt. Per Vans, make sure they have drilled heads and safety wire them.
I tried to sub an AN bolt once but they are not threaded along the entire length and can bottom out before the FAB is properly secured.
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----------------------
RV-7 N314SY (KWHP)
IO-360-B1B

CANbus based trim/flaps and electrical

Last edited by jdeas : 12-03-2014 at 07:26 AM.
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  #3  
Old 12-03-2014, 07:50 AM
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Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
Default

MS20074-04-03 BOLT CRS 1/4-20 THRD AN74A3
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EXP Aircraft Services LLC
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  #4  
Old 12-03-2014, 10:37 AM
VPYVO VPYVO is offline
 
Join Date: Sep 2011
Location: Melbourne Australia
Posts: 51
Default Thanks!

Thanks Walt and jdeas!
Walt Thanks not just for this but also the many useful and interesting posts.
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Rob Rickards
Melbourne Australia
RV7 VH-RRA flying Sept 2017
Sept 2019 180 hours
=VAF=. 2019 Donor
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  #5  
Old 12-03-2014, 12:07 PM
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jdeas jdeas is offline
 
Join Date: Mar 2006
Location: SoCal
Posts: 626
Default Check that you don't bottom out

Quote:
Originally Posted by Walt View Post
MS20074-04-03 BOLT CRS 1/4-20 THRD AN74A3
The FAB has a thin top. If you use the AN74A3 make sure you don't bottom out the threads. Even with a washer and a doubler plate I couldn't get that bolt to fit to my satisfaction on a Bendix RSA-5
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RV-7 N314SY (KWHP)
IO-360-B1B

CANbus based trim/flaps and electrical
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  #6  
Old 12-03-2014, 12:45 PM
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JonJay JonJay is offline
 
Join Date: Jan 2007
Location: Battleground
Posts: 4,348
Default

I used Philister head screws. They are threaded all the way and drilled. Don't have the MS number handy. I'm not Walt and not worthy!
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  #7  
Old 12-12-2014, 09:34 AM
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pilotkms pilotkms is offline
 
Join Date: Mar 2007
Location: WARNER ROBINS, GA
Posts: 391
Default Source?

I found these at Mcmaster Carr :

90124A540 Grade 5 Steel Wire-Lockable Cap Screw, 1/4"-20 Thread, 3/4" Long, Fully Threaded, Packs of 10
Per Pack
11.24
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  #8  
Old 02-04-2015, 06:33 PM
VPYVO VPYVO is offline
 
Join Date: Sep 2011
Location: Melbourne Australia
Posts: 51
Default Bolts found

For anyone else looking for these bolts in the kits I found them!
In the FAB kit would you believe. Ricght where they should be?

Bag 939 FAB 360 HW
4.000 WASHER TAB LOCK 1/ TAB LOCK WASHER
939 FAB 360 HW 1.000 MS21919WDG3 CLAMP 3/16"
939 FAB 360 HW 4.000 1/4-20X1/ BOLT, HEX HEAD
939 FAB 360 HW 6.000 K1000-3 PLATENUT
939 FAB 360 HW 6.000 AN3-4A BOLT
939 FAB 360 HW 6.000 AN960-10 WASHER (AN3)
939 FAB 360 HW 7.000 SD-42-BSLF POP RIVET
939 FAB 360 HW 0.010 AN426AD3-5 RIVETS (LB)
939 FAB 360 HW 0.030 AN470AD3-4 RIVET
939 FAB 360 HW 1.000 F 1/4 PIPE PLUG PLTD, ALLEN HD
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RV7 VH-RRA flying Sept 2017
Sept 2019 180 hours
=VAF=. 2019 Donor
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