VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 07-20-2019, 10:26 AM
rv9builder rv9builder is offline
 
Join Date: Jan 2005
Location: Irvine, CA
Posts: 788
Default 1/4 or 3/8-inch torque wrench?

I want to buy a 20–150 inch-pound CDI torque wrench. They are available with either a 1/4-inch drive or a 3/8-inch drive. Is one drive size better than the other for working on aircraft and torquing AN4 bolts? I own sockets in both sizes, so that's not an issue, and both wrenches are the same length and diameter.

Thanks!
__________________
Mark
RV-12iS Fuselage
RV-9A Project: Sold

VAF donation made for 2019

Last edited by rv9builder : 07-20-2019 at 03:04 PM.
Reply With Quote
  #2  
Old 07-20-2019, 10:54 AM
jcarne's Avatar
jcarne jcarne is offline
 
Join Date: Jul 2016
Location: Worland, Wyoming
Posts: 945
Default

If you own sockets in both sizes I would say it doesn't matter. I have 1/4" CDI that I like and it is sometimes a pain to go back and forth between the 1/4" and 3/8" wrench set I have.
__________________
Jereme Carne
PPL
RV-7A Emp. done
Wings mostly done
Fuselage almost done
Finish kit arrived
Exempt but gladly paying!
Reply With Quote
  #3  
Old 07-20-2019, 11:32 AM
fl-mike's Avatar
fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 1,131
Default

torque screwdriver with 1/4" socket adapter for AN3's and #8 screws
__________________
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS
N164WM
N184WM reserved (RV-8)....tail kit done, slow-build wing done, slow-build fuselage in progress.
Reply With Quote
  #4  
Old 07-20-2019, 04:32 PM
rapid_ascent rapid_ascent is offline
 
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,060
Default

I have a 1/4" CDI wrench. I bought an shaft adapter for 1/4" to 3/8" then I can use my 3/8" sockets too.
__________________
Ray Tonks
2018 Donation Paid
Titan IOX-370 on order
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
Shop Setup - In Progress (Gathering Tools, Never Complete)
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
Reply With Quote
  #5  
Old 07-20-2019, 06:27 PM
Rick_A's Avatar
Rick_A Rick_A is offline
 
Join Date: Oct 2005
Location: Highland Village, TX
Posts: 1,460
Default Both eventually

The 1/4 20-150 in lb will do the job for about 90% of the build. However, at some point you will need a Ft Lb wrench for a few items. At which point a 3/8 ft lb torque wrench is a good option.

Adapters for 1/4 to 3/8 and 3/8 to 1/4 come in very handy.

A couple of things that need greater than 150 in lb are spark plugs and exhaust manifold nuts.
__________________
Rick Aronow,
A&P
Flying 7A Slider;
RV-12 SOLD
Highland Village,TX
Reply With Quote
  #6  
Old 07-21-2019, 06:46 AM
DaleB's Avatar
DaleB DaleB is offline
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,121
Default

I use a little Park Tools beam style 1/4" drive for AN3 and AN4. It's simple, easy to use, and compact enough to fin most places. And not terribly expensive.
__________________
Dale

Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
Reply With Quote
  #7  
Old 07-21-2019, 08:01 AM
Plummit's Avatar
Plummit Plummit is offline
 
Join Date: Apr 2010
Location: SoCal
Posts: 858
Default Free!

I'll give you my 1/4" drive Harbor Fright torque wrench if you need it.

-Marc
__________________
RV-10
N814RV
2019 Donation Made
Reply With Quote
  #8  
Old 07-21-2019, 10:50 AM
rv9builder rv9builder is offline
 
Join Date: Jan 2005
Location: Irvine, CA
Posts: 788
Default

Quote:
Originally Posted by DaleB View Post
I use a little Park Tools beam style 1/4" drive for AN3 and AN4. It's simple, easy to use, and compact enough to fin most places. And not terribly expensive.
I have that same wrench and use it for AN-3 bolts. Since it maxes out at 60 inch pounds, I've never used it for AN4s.
__________________
Mark
RV-12iS Fuselage
RV-9A Project: Sold

VAF donation made for 2019
Reply With Quote
  #9  
Old 07-21-2019, 11:07 AM
rv9builder rv9builder is offline
 
Join Date: Jan 2005
Location: Irvine, CA
Posts: 788
Default

Quote:
Originally Posted by Plummit View Post
I'll give you my 1/4" drive Harbor Fright torque wrench if you need it.

-Marc
Thanks, Marc, but I'm not sure a typical torque wrench from Harbor Freight is up to aircraft standards. That said, Harbor Freight has a high-end line of torque wrenches called Icon. I thought this video was interesting. It compares an Icon torque wrench to a similar wrench from Snap-On.

https://www.harborfreight.com/38-in-...+torque+wrench
__________________
Mark
RV-12iS Fuselage
RV-9A Project: Sold

VAF donation made for 2019
Reply With Quote
  #10  
Old 07-21-2019, 11:09 AM
az_gila's Avatar
az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,911
Exclamation

Quote:
Originally Posted by DaleB View Post
I use a little Park Tools beam style 1/4" drive for AN3 and AN4. It's simple, easy to use, and compact enough to fin most places. And not terribly expensive.
I don't think those beam wrenches are still available.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 03:09 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.