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  1. #1
    Member
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    Jan 2007
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    MS
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    Ford, 3000 diesel (sold), Kubota, 3130

    Default What size auger for my post hole digger?

    I have a kubota L3130 tractor and about to buy a post hole digger. I am building a fence and going to sink around forty 4" and six 6" post. My question is will one size auger be ok, let say a 9". Or would I do a better job getting a 6" and 9".

    If I dig the 4" holes with a 9" auger will the post be too loose.
    Thanks; Mickey

  2. #2
    Super Member
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    central New York
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    all makes and models

    Default Re: What size auger for my post hole digger?

    Any post that is a smaller diameter then the auger will be loose for a while until the soil becomes compressed as much as the surrounding dirt.

    The most common auger sold is the nine inch! It is good to dig with that diameter, often the auger hole isn't quite straight and the larger diameter will allow you to have the room to make it vertical.

  3. #3
    Member
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    Jan 2007
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    MS
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    Ford, 3000 diesel (sold), Kubota, 3130

    Default Re: What size auger for my post hole digger?

    Thanks Art, I have done a surch and found out massive amount of info on this subject. Should have done that first.

    Mickey

  4. #4
    Silver Member Mundy's Avatar
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    Nov 2007
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    112
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    Swartz Creek, Michigan
    Tractor
    Satoh Beaver 4X4, Scag Super Z

    Default Re: What size auger for my post hole digger?

    We built 1150' of privacy fence around our back yard over a three year period. All posts are 4" and 8' apart. Our soil type varied from dense clay to wet sand.

    The first year we used a 6" auger and found it was very difficult to keep the fence in line. The 6" holes did not allow for much if any adjustment of the post and if the bit wandered during boring any adjustment to the hole had to be done with post hole diggers. This was a pain.

    The next year we used a 9" and it was great. The hole was big enough to allow the posts to be set in a nice straight line and the backfill/compaction around the post was much easier too.

    We used blast furmace slag for backfill and a 5' by 1.5" solid steel pry bar used like a ram rod to compact the slag around the post. We left the slag down about 8" and topped the hole with the clay spoils.

    6" may be a little tight in the 9" hole but if most are 4" posts a little extra hand work with a few 6" posts in 9" holes would not be too bad.

    Good Luck
    http://Crestwoodscorsos.com
    Regards,
    Mundy


    If they outlawed guns could we use swords?

  5. #5
    Silver Member
    Join Date
    Aug 2007
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    112
    Location
    Ottawa/Gatineau, Canada
    Tractor
    Kubota BX24

    Default Re: What size auger for my post hole digger?

    I'd say it has a lot to do with how well you can align your holes in order to get a nice straight fence. You get more wiggle room with a larger auger. Also, some 6" posts may be larger than 6"...
    I started off with a 9 inch and ended up buying a 12 inch. The backfilled holes in either size didn't seem overly loose, but then there are tricks to backfilling...
    Happiness is a clean zerk!

    Bx24 with mower, Kubota rotary tiller, Greenline PHD w/9"/12" auger, Walco 48" Rotory Cutter, Bro-Tek skid plates and thumb.

  6. #6
    Elite Member buckeyefarmer's Avatar
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    Kubota L3940 L5030 MF205-4

    Default Re: What size auger for my post hole digger?

    I use a 12" auger.
    L3940HSTC, QA FEL, BH92
    L5030HST,QA,FEL
    MF 205-4
    Husqvarna YTH24V48LS (the other orange)
    KK Finish Mower, KK Tiller, 6' rotary mower, Pallet forks, PHD, Blade, Carryall, cultivator, 2 wheel barrows, assorted gardening tools,

  7. #7
    Gold Member
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    Dec 2009
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    Blue Ridge Mnts, Va
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    Kubota B7800 4/wd

    Default Re: What size auger for my post hole digger?

    There are some educational and informative videos on YouTube. Most recently I have been putting # 57 gravel (3/4 to 1" rock) around my post and in the bottom of the hole for drainage and stability , a little more work and expense -I believe it's worth the extra effort.

    YouTube - tractor post hole digging

    YouTube - Post Installation

  8. #8
    Platinum Member thavil's Avatar
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    Southern Maryland
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    Kubota BX24

    Default Re: What size auger for my post hole digger?

    richardbro said everything I was going to say, I personally went with the 12" auger. I started off with the 9" that came with my Leinbach PHD but quickly went to TSC and purchased a 12". The 12" gave me more room for placement of my posts since I'm not a pro yet on digging straight holes. Backfilling wasn't a problem and long as you tamp as you backfill.

    As you can see in the attached picture, I didn't dig a very straight hole. Looked straight from the seat but not when I got off the tractor.
    Attached Thumbnails Attached Thumbnails -110908_10212-jpg  
    BX24, 60" MMM, Woods HC48 Rotary Cutter, W.R Long Flat Toothbar, 4' Farm Force Box Blade, Leinbach 7200JR PHD w/ 12" & 9" augers, Cosmo XB 3PH spreader, Pat's Easy Change, Front & Rear Bro-Tek Skid Plates, BXpanded Under Armor/Brush Forks/BH Dolly/Bucket Hooks/Tool Pouch/Work Lights, drag harrow, Larry's Mower Axle Stands, 52" Rachet Rake, Millcreek manure spreader

  9. #9
    Elite Member
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    Jul 2006
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    midwest
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    JD 4520, Toolcat 5610, Bobcat S300, Case-IH 125 Pro, Case-IH 245, IH 1086, IH 806

    Default Re: What size auger for my post hole digger?

    For those size of posts, I would go with 9" auger. It will work with both 4" or 6" posts. A 12" auger is going to create a lot of tamping for a 4" post. You may have to use hand diggers to widen the hole on the 6" posts, if you are off the mark.

  10. #10
    Elite Member buckeyefarmer's Avatar
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    Kubota L3940 L5030 MF205-4

    Default Re: What size auger for my post hole digger?

    FWIW, If the hole left around the post isn't big enough, you can't tamp it good. For a fence I just put the dirt back in, tamping as I fill the hole.
    L3940HSTC, QA FEL, BH92
    L5030HST,QA,FEL
    MF 205-4
    Husqvarna YTH24V48LS (the other orange)
    KK Finish Mower, KK Tiller, 6' rotary mower, Pallet forks, PHD, Blade, Carryall, cultivator, 2 wheel barrows, assorted gardening tools,

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