Post hole borer - size of auger

Question

I am hiring a post hole borer to put a number of 75x75 post in. I have the choice of 150mm or 200mm auger. Which is more suitable for this job please?

Kris · Accepted Answer

200mm as it will give you room to position post correctly and space for postmix to secure post in place!

Edward · Answer

Hello,
For 75/75 post better choice for 200mm may use more postcrete but you get a better resistance as will depend on the height of the fence as a general rule is when setting a fence post into the ground, the height required above the ground should be divided by 3 and this figure is the hole depth required. The width of the post hole should be 3 times the width of diameter of the post.

For example, if you are erecting a 6 foot high fence using 4 inch fence posts, the posts need to be 6 feet above the ground. 6 divided by 3 is 2, therefore the depth of the hole required is 2 feet.
Thanks 
Edward

Phillip · Answer

The 200 borer would be my preference has it would
Give the post more strength in the ground .Then use post mix 
Good luck Phil.

Stephen · Answer

200mm would be preferable, in case posts are slightly bigger.

Jordan · Answer

I would go with the 150mm as you dont want the hole to be too wide

Paul · Answer

You need a 2ft deep hole by 150mm in width, the width only needs to be the double of the post bare in mind that once you have got your postcrete in place there is still chance of movement, you are only needing to allow enough to put your post in and postcrete to hold it in place.

Michael · Answer

150mm will do the job just fine with plenty of room for backfill

James · Answer

I would personally go for 200mm that will give more room for concrete/course mix (the more the better).

Tamoor · Answer

It depends on a number of things, the size of the post, the height of poles, the material the post is made from, you have to consider all these things. But generally, if you have  a6ft post made from wood, you want to put it near enough to a third in the ground and the size of the auger in my experience should be double the size of the post, so for your post size, the hole size should be 150in.
There you have it.

Richard · Answer

There isn't really that much difference, I guess it depends how much cement you want in the hole. If you are a novice I'd go for the 150mm as it will be easier to keep the post in position when your putting the postcrete in.

Post hole borer - size of auger

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