What Size Auger For 6x6 PostHave about a dozen to set for a fence then will be using it later for deck posts. The Best Post Hole Diggers of 2023. i don't set that many corner posts. One or two inches additional each way generally won’t hurt the integrity of the post. A 10″-diameter hole is required for a 6×6 post. The 8 Best Post Hole Diggers for Landscaping Projects. UPGRADE PICK: Landworks Cordless Earth Auger. 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. What size auger for 6×6 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. Post Hole Calculator for Concrete Embedded Posts. Step 1: Install the Post Brackets Secure the post brackets with washers and nuts, and then set the pressure plates on top. The material used in making an auger’s blade is also important because it determines how easily it can cut through different types of dirt and rock without breaking or dulling prematurely. Do this by nailing the sides of the tube to the center of a tic-tac-toe grid of 2x4s at the top of the hole. i don't set that many corner posts. of Gravel 3" under each fence post. For example, if you’re using 6″ x 6″ posts, you should use a 6″ auger with six-inch long blades. See more 2 Reply Save Like 4 MTB98 · #5 · Oct 29, 2019 Agreed that 9” is best for 4” posts. Your 4x4 posts are really 3 1/2 by 3 1/2 which is about 5" at the diagonal. To find the concrete needed, start by subtracting the volume of the post from the volume of the hole: 1. So, a 6" bit wouldn't help at all for 4"x6" posts, and would just barely work for 4"x4"s. Fence post don't. Keep in mind that you’ll need a larger hole (and a larger auger) if you’ll be filling around the post with concrete. post hole Confirm hole diameter from building plan. Have about a dozen to set for a fence then will be using it later for deck posts. Use a power auger or post hole digger to dig post holes of about two to four feet deep for the footings. so 6" auger for a 4x4 works good enough for me. The most common mistake when sizing forms and augers is choosing a curb form which is too small for a particular auger size. Find the right auger size for your project. The one to choose depends on the type of posts you’re installing. The 12" is needed for 6x6 posts. Shovel a 6" layer of gravel into the hole to provide drainage. While usually 18-or 24-inch diameter, verify from building plans. It comes with a 6-inch auger that measures 30 inches long, but you can add a standard ¾-inch extension for boring even deeper. Post Hole Diameter (Inches). Dig an 8"-diameter hole at least 6" deeper than your area's frost line for each 4x4 post, using a power auger, hand auger, or post-hole digger. Post Hole Depth (Inches) Total Cu. Post Hole Concrete Calculator. What Size Auger Do I Need For Fence Posts? — Attachments King. Then multiply by the number of posts to find the total amount of concrete needed for the project: 1. A 12-inch auger, best attached to a heavy machine, will create a hole large enough for a 6×6 or 4×6 post and plenty of concrete. How deep should a post be in the ground:– in general, a post 6×6 or 8×8 that extend 8 feet or more above ground level should be at least 3 feet deep buried in the ground. by KingDustPan What diameter hole should I auger for a 4”x6” fence post? Hello, I’m getting mixed opinions so I wanted to ask here. BEST MANUAL: Ames Post Hole Digger With Ruler. so 6" auger for a 4x4 works good enough for me. Not sure if the holes are well oversized, or close to whatever the auger. What size auger do I need for a 4x4 inch post? 4x4-inch posts will typically fit into holes drilled by a 6-inch diameter auger bit. The 12" is needed for 6x6 posts. What Size Auger For 6X6 Post. How deep should a post be in the ground:– in general, a post 6×6 or 8×8 that extend 8 feet or more above ground level should be at least 3 feet deep buried in the ground. Having more loose soil around a post is not a good thing. The general sizing rules are as follows: Bulbs -. Now, put the strings back on the batterboards, but move them toward the outside of the layout by. Augers Included in This Sale! - Check Out Our Other Combos for Different Sizes! Specifications: * 2-stroke, air-cooled, 3 horsepower * 63cc . Plan on at least four posts, one at each corner. Wondering of the 12" may be too big. A 6x6 post requires a 10"-diameter hole. Enter the height of the posts. For example, for a 6 foot fence/post, a minimum of 2 feet of post should be in the ground for a total post length of 8 feet. 3/4″ dia, 12mm socket size driver head 36″ (900mm) Post Sizes: Nominal 4×4 and 6×6 posts: HOW IT WORKS. The most common mistake when sizing forms and augers is choosing a curb form which is too small for a particular auger size. How deep should a 6×6 fence post be?. The 12" is needed for 6x6 posts. What Size Auger For 6X6 Post Dig an 8″-diameter hole at least 6″ deeper than your area’s frost line for each 4×4 post, using a power auger, hand auger, or post-hole digger. i don't set that many corner posts. Step 1: Install the Post Brackets Secure the post brackets with washers and nuts, and then set the pressure plates on top. A 6×6 post requires a 10″-diameter hole. For loose or sandy soil, using a tube form is recommended (left). Try using the auger to test your soil if you are concerned that there are rocks or other obstructions in the area you plan to build on. What size auger for 6×6 post? Dig, align, and finish the job by digging an 8″-diameter hole for each 4×4 post at least 6″ deeper than your area’s frost line with a power auger, hand auger, or post-hole digger. Depending on size of carport, you may need to have one additional support post at the halfway mark on both the left and right sides for a total of six. So the total load imposed on the soil below each footing would be a maximum of 1800 psf as. The amount of concrete required post anchors in the wet concrete. For larger industrial applications, you will need. Here is a general auger size chart for post hole digging with a tractor: Post Diameter (inches) Auger Size (inches) 2-3. Do this by nailing the sides of the tube to the center of a tic-tac-toe grid of 2x4s at the top. on other hand a 9" auger would be nice for 6x6 corner. vs the handful or corner posts i would need to deal with. Deck And Other Footings: sizes available 6”-36” wide, . What size Auger do I need for fence posts? A 12-inch auger, best attached to a heavy machine, will create a hole large enough for a 6×6 or 4×6 post and plenty of concrete. 3/4″ dia, 12mm socket size driver head. You will spend a little more on concrete, but you won't have to worry about it cracking in the corners. vs the handful or corner posts i would need to deal with. · Augering Holes Using an auger mounted on a skid steer, bore holes to depth required on building plans. What size do auger bits come in?. Sep 29, 2014 / What size auger do you use? #8 O. The width of the post hole should be 3 times the width of diameter of the post. Smaller augers, like 4- or 6-inch options, are appropriate for light-duty work (like mailboxes) as well as metal fence posts for chain-link fences. width ), a two level deck or deck with roof – 24”x24”. Use a power auger or post hole digger to dig post holes of about two to four feet deep for the footings. The 6x6 post is the minimum recommended size in order to provide the strength, rigidity and the proportion in the final appearance. UPGRADE PICK: Landworks Cordless Earth Auger. Can I use an auger for fence posts?. Compact and level the gravel using a post or 2 x 4. A 2"-4" auger is capable of quickly and efficiently drilling large numbers of holes suitable for seeds, bulbs or small potted plants. The 9" works best for 6" round or 4x4 posts. Smaller augers, like 4- or 6-inch options, are appropriate for light-duty work like mailboxes as well as metal fence posts for chain-link fences. BEST BANG FOR THE BUCK: XtremePowerUS Electric Post Hole Digger With 4″ Bit. Reinforcing Rod fed through a Hollow Auger Shaft into the Finished Curb Auger assemblies can be provided as either "hollow", allowing 3/8″ diameter reinforcing rod to be fed through the hollow auger shaft and placed in. It is important to note that this chart is a general guideline and may vary depending on the factors mentioned above. – The bottom of the footings must be a minimum of 36” below finish grade level. A 6x6 post requires a 10"-diameter hole. footings for a deck, you’ll obviously need the 12-in. Still have questions? Contact Us Get the Right Auger Diameter 2“ Diameter 3“ Diameter 4“ & 5“ Diameter 7“ Diameter 8“-9“ Diameter. Auger rentals with 4-to-5-inch diameters work for smaller fence posts and plants that come in quart-sized pots. Post Hole Diameter (Inches). The size of the auger needed will depend on various factors, including the size of the posts, the type of soil, and the depth of the holes required. The post saddles for the Deck Foot Anchor have a lateral slide feature which allows the saddle to be moved up to about 2" to make up for any errors in the location of your pergola footings. All About Sonotubes: What Are They, How to Use …. What size auger is best for fence posts? A 12-inch auger, best attached to a heavy machine, will create a hole large enough for a 6×6 or 4×6 post and plenty of concrete. What size auger for 6x6 post?. com/watch?v=M7nIEwPTGC4 --~--As the property projects chug along, we fina. How Deep Do I Need to Dig a Post. The posts are 10’ tall, and the depth of the hole will be 4’, so buried 4’. Soil that contains a high amount of sand or gravel will require an auger with a smaller diameter since these. Best Auger For Fence Posts 2023:. Auger drills are interchangeable and come in 4-, 6-, 8- or 12-in. BEST MANUAL: Ames Post Hole Digger With Ruler. Dig the post hole, making it three times the width of the post and at a depth equal to 1/3 to 1⁄2 of the above-ground length of the post, plus 6" (right). This is measured from the ground to the top of the posts. The 9" works best for 6" round or 4x4 posts. What size auger bits do I need? If you want to drill a small hole in the wood (for general purpose or home use) all you need is hand wood auger bits (available up to 200 mm or 8″ size). Precautions: • QUIK-tubes should be protected from moisture prior to placement. It should be set back half the width of the post from the string. However, this leaves little to no room for cement or dirt to pack in and secure the post. For larger industrial applications, you will need. Setting Posts without Mixing. Use pressure treated lumber for posts since they will. 6x6 posts are over kill for a fence of this height IMO but you maybe matching to existing so do what you want to do. so 6" auger for a 4x4 works good enough for me. The petrol fence post auger is in essence pretty much the same as its . Gallon Pot & Post Hole Auger (7" x 28") $235. Check out our latest Upload! Excavator, Tractor clearing trees! https://www. For these post hole sizes, you will want to allow 4 inches of room. Finally, augers with 8 to 9 inch diameters work for plants in two-gallon-sized pots and drilling holes for larger 6x6. The general sizing rules are as follows: Bulbs - 2", 3" or 4" Depending on bulb size. If your need to dig holes for shrubs, you can always use the 9" auger and drill 3 holes close together in a triangular pattern. A 6×6 post requires a 10″-diameter hole. What Size Auger Do I Need?. Product Specs Type: Cordless electric Depth capacity: 30 inches. auger for steel fence posts. What size auger is best for fence posts? A 12-inch auger, best attached to a heavy machine, will create a hole large enough for a 6×6 or 4×6 post and plenty of concrete. Best value: Landworks Earth Auger Power The Landworks Earth Auger Power makes your life simpler. What diameter hole should I auger for a 4”x6” fence post?. How to Build a Deck: Post Holes and Deck Framing. Always consult the factory for recommendations on proper auger size and curb form choices. How deep should a post be in the ground:– in general, a post 6×6 or 8×8 that extend 8 feet or more above ground level should be at least 3 feet deep buried in the ground. So, if you were planning to install a 4×4 post, a 12-inch Sonotube would be appropriate. width, 6×6 post – 14” min. so 6" auger for a 4x4 works good enough for me. of Gravel 3" under each fence post. How big of a hole do I need for a 4x4 fence post?. How Many Bags of Concrete for a Fence Post?. As a rule of thumb, you should always use a Sonotube with a diameter that is three times your desired post’s width. com">What size auger for 6×6 post? – TipsFolder. Dig an 8″-diameter hole at least 6″ deeper than your area's frost line for each 4×4 post, using a power auger, hand auger, or post-hole digger. Although the limited runtime of a. Building holes may be made larger in diameter or greater in depth (provided posts are long enough) without adversely affecting building structure. How Deep Can You Dig With a Post Hole Auger? In most cases you can dig to a depth of about three feet with a post hole auger or power auger. Use this chart to help compare sizes. Hole Sizes for Fence Posts and Other Posts. The auger bit is compatible with both 1/2 and 3/8 drill-rams. Use a 4x4 post to compact the soil at the bottom of the hole and then add 6" of gravel for better drainage under the footing. Then, find out how to power your planting auger properly for the best possible performance. Whether you're building a fence, setting a mailbox or even a basketball goal, the best way to ensure your posts will stay sturdy and true for years is to set . How deep should fence posts be?. For example, if you’re using 6″ x 6″ posts, you should use a 6″ auger with six-inch long blades. What size auger bit do you need for a 4×4 post? 6″ diameter. Be a Post Master, Installing Deck and Fencing Posts. What size aer do I require for fence posts? A 12-inch auger, which can be attached to a heavy machine, will make a hole large enough for a 6'6 or 4'6 post and plenty of concrete. Drive one vertical rebar into the ground in the center of the hole, then pour a 4-6” (100-152 mm) footing. Generally, for digging post holes with augers mounted on tractors, you'll want bits that come in sizes ranging from 6 inches to 12 inches in diameter. While a smaller diameter auger may be suitable. How to Build Deck Footings with QUIKRETE® Watch on. What size auger is best for fence posts. Auger drills are interchangeable and come in 4-, 6-, 8- or 12-in. Other Auger Considerations. Smaller augers, like 4- or 6-inch options, are appropriate for light-duty work (like mailboxes) as well as metal fence posts for chain-link fences. That means that for a 6-inch post, you will want a 10-inch post hole. My question is with regards to the diameter of auger bit to useis 10” sufficient?. Pour 6" of gravel or crushed stone into the bottom of the hole. The one to choose depends on the type of posts you’re installing. Then dump concrete through the tube into the bottom of the hole. What size do auger bits come in?. When it comes to post hole digging with a tractor, choosing the right auger size is crucial for getting the job done efficiently and . What size auger bit do you need for a 4×4 post? 6″. 6" square post won't fit a 6"hole. How to Pour Footings for a Solid, Frost. Also, the 9 inch auger seemed to be more efficient at getting the loose dirt out of the hole. What Size Concrete Tube For 6X6 Post. Post Holes- If you plan to secure your posts with cement or by tamping dirt, you will need spacing around the post to do so. You’ll be able to get away with a 6-in. What Size Auger For 6X6 Post. Place the QUIK-tube on the footing and backfill or brace it vertically to hold in place. If the auger is very much oversize you end up doing a lot of shoveling to fill the hole. The auger bit is 19. After the wide part at the bottom of the hole has. Because of the slim size. How deep should fence posts be?. Auger for fence post has a 4-inch diameter and 6-inch long shaft. For example, for a 6 foot fence/post, a minimum of 2 feet of post should be in the ground for a total post length of 8 feet. The diameter of your post hole should be three times the diameter of your post. What size auger bits do I need? If you want to drill a small hole. 25th Aug 2014, 12:59 AM #6 phild01 Community Moderator Join Date Aug 2009 Location Sydney, north Posts 16,685 Originally Posted by andy the pm. Having more loose soil around a post is not a good. up from the bottom of the footing. You can dig the footings 6" deeper than the frost line. FOOTINGS: – Poured concrete footings should be a minimum of 8” wider than the posts (4×4 post – 12” min. The 6-inch-wide auger of this digger is wide enough for larger posts, and with a wide-set pair of handlebars, it's designed for comfortable operation. When installing posts in clay or rocky soils, an auger with a diameter of at least 4 inches is recommended. What Size Auger For 6X6 Post Dig an 8″-diameter hole at least 6″ deeper than your area’s frost line for each 4×4 post, using a power auger, hand auger, or post-hole digger. Shovel a 6″ layer of gravel into the hole to provide drainage. What size auger bits do I need? If you want to drill a small hole in the wood (for general purpose or home use) all you need is hand wood auger bits (available up to 200 mm or 8″ size). Seriously never used any kind of PHD ever. Remember, the larger the diameter, the tougher it is to handle the machine. Because most extruded curb is between 33 and 55 square inches in cross sectional area 90% of all machines are equipped with the standard 6″ diameter auger. Use pressure treated lumber for posts since they will be in contact with the ground; An 8″ auger will cut about a 9″ diameter hole which is plenty wide for a 4×4 post. Find the right auger size for your project. 6" square post won't fit a 6"hole. For example: A 4x4 post (actual size 3. How deep should a post be in the ground:– in general, a post 6×6 or 8×8 that extend 8 feet or more above ground level. A 12-inch auger, best attached to a heavy machine, will create a hole large enough for a 6×6 or 4×6 post and plenty of concrete. 6x6 fence posts: how many bags of Quikrete?. com/pages/wood-post-anchor-kits/ Posthole Digger - Post Hole Digger - Auger Size?. Use a 4x4 post to compact the soil at the bottom of the hole and then add 6" of gravel for better drainage under the footing. Plan on at least four posts, one at each corner. Place approximately 2” (50 mm) of gravel in the bottom of the hole. The depth is dependent on the length of the auger bit. I would go for a 8" hole, this allows you some adjustment to plumb up your posts. It's not so much the shoveling as the tamping the dirt around the post as you fill the hole that gets old in a hurry. For a six-foot-high fence post, we would need a hole that’s 36 inches deep and 12 inches in diameter. Step 1: Determine the First Post Hole Center. If you are going to be using a mix of 3 to 6 inch post I'd opt for a 7 or 8 inch auger. Reply Save Like 3 Oscar Leroy. What size aer do I require for fence posts? A 12-inch auger, which can be attached to a heavy machine, will make a hole large enough for a 6’6 or 4’6 post and plenty of. Enter the height of the posts. Beside this,how big of an auger do i need?. but honestly i save more time dealing with the 50 plus wooden line posts. i don't set that many corner posts. A 2"-4" auger is capable of quickly and efficiently drilling large numbers of holes suitable for seeds, bulbs or small potted plants. Then dig out the center by hand. For example: A 4×4 post (actual size 3. As the post is 4 inches wide, 3 multiplied by 4 is 12, so the hole. Best Post Hole Diggers for Landscaping Projects">The 8 Best Post Hole Diggers for Landscaping Projects. A 6×6 post requires a 10″-diameter hole. When you pour concrete footings, hold the cardboard concrete form tube about 12 in. Because most extruded curb is between 33 and 55 square inches in cross sectional area 90% of all machines are equipped with the standard 6″ diameter auger. Always consult the factory for recommendations on proper auger size and curb form choices. 6 divided by 3 is 2, therefore the depth of the hole required is 2 feet. Post Hole Calculator for Concrete Embedded Posts">Post Hole Calculator for Concrete Embedded Posts. Have about a dozen to set for a fence then will be using it later for deck posts. Post Hole Digging Tips. Use a power auger. 5" and has a diameter of about 6. How to Easily Lay Out and Dig a Post Hole. It is recommended to consult the tractor and auger manufacturer's. The auger bit has a 3-inch diameter and 5/16 hex shaft (the size of your drill-ram will determine whether you need to buy a new shaft). 675 inches between the post corners and the. What Size Auger For 6X6 Post. The general sizing rules are as follows: Bulbs - 2", 3" or 4" Depending on bulb size 1 Quart Pot - 6" 1 Gallon Pot - 8" 2 Gallon Pot - 8" 3 Gallon Pot - 10" 5 Gallon Pot - 12" The required hole size also depends on the type of soil you are planting in. Posts that extend 6 feet above ground level should have holes at least 2 1/2 feet deep. The diameter of your post hole should be three times the diameter of your post. Installing Pergola Footings. Learn how to choose the perfect auger diameter for your landscaping or gardening project with the auger bit size chart below. 5") has a maximum width of just over 5". Its auger bit for 4×4 posts and trees is compatible with both 1/2 and 3/8 drills. Post Hole Depth (Inches) Total Cu. but honestly i save more time dealing with the 50 plus wooden line posts. 4 Pour Concrete and Raise Posts Prepare concrete mix in a wheelbarrow according to instructions and pour into the footings. Plan on at least four posts, one at each corner. The size of the auger needed will depend on various factors, including the size of the posts, the type of soil, and the depth of the holes required. This is measured from the ground to the top of the posts. If you’re pouring 12-in. How big of a hole do I need for a 6x6 post?. 4“ & 5“ Diameter 7“ Diameter 8“-9“ Diameter Compare Auger Sizes Comparison of the Different Augers I Use for Planting! 🌿 // Garden Answer Watch on Some augers are taller than they seem. For example, for a 6 foot fence/post, a minimum of 2 feet of post should be in the ground for a total post length of 8 feet. Try using the auger to test your soil if you are concerned that there are rocks or other obstructions in the area you plan to build on. Reinforcing Rod fed through a Hollow Auger. Great For: Planting multiple bulbs into a single hole; Planting 1-gallon potted plants;. Dig an 8″-diameter hole at least 6″ deeper than your area’s frost line for each 4×4 post, using a power auger, hand auger, or post. Size: Available in 6” (152 mm), 8” (203 mm), 10” (254 mm) and 12”(305 mm) diameters in 4’ (1. The auger bit is compatible with both 1/2 and 3/8 drill-rams. Posts that extend 6 feet above ground level should have holes at least 2 1/2 feet deep. Phil, pretty sure he means 6" diameter. The 9" works best for 6" round or 4x4 posts. Learn how to choose the perfect auger diameter for your landscaping or gardening project with the auger bit size chart below. Most often, poles are installed that range from 4 inches to 6 inches. Tool Tuff 2 Man Hand Held Fence Post Hole Digger/Earth Auger w. What size hole auger for 6" pine posts in clay?. Again, my experience in my rock hard and rock filled clay is that the bit can wander a bit, so I really liked the extra room the 12" bit gave. Using a Power Auger (DIY). If your need to dig holes for shrubs, you can always use the 9" auger and drill 3 holes close together in a triangular pattern. To provide drainage, insert a 6″ layer of gravel into the hole. A 4"x6" post is actually about 3. Ideally you want a bell shape at the bottom . What size auger for 6×6 post? – TipsFolder. Here is a general auger size chart for post hole digging with a tractor: Post Diameter (inches) Auger Size (inches) 2-3. If you are cutting the cardboard sonotubes in half with a handsaw, we recommend installing the uncut end on the top. Dig the post hole, making it three times the width of the post and at a depth equal to 1/3 to 1⁄2 of the above-ground length of the post, plus 6" (right). Mark the center for the first post on the ground. BEST BANG FOR THE BUCK: XtremePowerUS Electric Post Hole Digger With 4″ Bit. What size hole should I auger for a 4”x6” fence post?. 6x6 posts – 10' long posts set 42” deep: Set in a 10” hole = $70 ea. Post Holes and Deck Framing. You can dig the footings 6" deeper than the frost line. Earth augers with 2-to-3-inch diameters are best for gardeners who plant bulbs, install small stakes and poles and perform root aeration. The material used in making an auger’s blade is also important because it determines how easily it can cut through different types of dirt and rock without breaking or dulling prematurely. The width of the post hole should be 3 times the width of diameter of the post. The Rule of Thumb is 6′-0″ apart for each footing. How wide should a hole be for a 6x6 post?. The 6-inch-wide auger of this digger is wide enough for larger posts, and with a wide-set pair of handlebars, it's designed for comfortable operation. So, if you’re planning on using a four-inch round or 4x4-inch square post, your post hole will need to be 12 inches in diameter. With a 9 inch hole, you only have 1. auger (Photo 3), but for 4×4 posts, pick up an 8-in. Call for all required inspections! Confirm hole diameter from building plan. The auger bit is 19 inches long. I personally would go for 12 inches. This corresponds to a design load of 50 psf and tributary areas over each footing of 36 sqft. A 6x6 post requires a. How deep should a post be in the ground:- in general, a post 6×6 or 8×8 that extend 8 feet or more above ground level should be at least 3 feet deep buried in the ground. Depending on size of carport, you may need to have one additional support post at the halfway mark on both the left and right sides for a total of six. Run a string across the post locations — offset 1-3/4 inches from the center of the anchor — to help align the post brackets. If you are cutting the cardboard. Auger Guide, Picking A Planting Auger. The 12 inch auger is more suited for 6x6 posts or 8” round wood posts. A 12-inch auger, which can be attached to a heavy machine, will make a hole large enough for a 6’6 or 4’6 post and plenty of concrete. Larger potted plants are generally measured in gallons and the width of the pots varies slightly. If you are going to be using a mix of 3 to 6 inch post I'd opt for a 7 or 8 inch auger. When you pour concrete footings, hold the cardboard concrete form tube about 12 in. 675 inches between the post corners and the edge of the hole. How deep should a 6x6 post be in the ground?. Post hole diameter should be at least twice as wide as post. Step 2: Secure the Posts to the Brackets Step 3: Use a Chalk Line to Mark Post Heights. Choosing the Appropriate Auger Size. Smaller augers, such as 4- or 6-inch options, are suitable for light-duty applications such as mailboxes and chain-link fence metal fence posts. Choose a 7-inch diameter for plants in gallon-sized pots and drilling holes for 4x4 fence posts. An 8" hole with a 3" post in it is a lot of work. Most of my planned digging will be smaller posts maybe 3-6", but I don't want to be too limited. Other Auger Considerations. Post hole diameter should be at least twice as wide as post. compared to actual line posts. Its auger bit for 4×4 posts and trees is compatible with both 1/2 and 3/8 drills. on other hand a 9" auger would be nice for 6x6 corner. 069 cubic ft × 20 posts = 21. on other hand a 9" auger would be nice for. What Size Post Hole Digger Do I Need? – Upgraded Home. If you drill a 6" hole for a 6" post, and you drill it slightly off plumb, then you post will be slightly off plumb. After marking your hole, mark where the layout string is tied to the batter boards, and remove the strings to make digging easier. What size auger do you use?. A 12-inch auger, which can be attached to a heavy machine, will make a hole large enough for a 6’6 or 4’6 post and plenty of concrete. Digging Holes for a Pole Barn. on other hand a 9" auger would be nice for 6x6 corner. For example, if you’re using 6″ x 6″ posts, you should use a 6″ auger with six-inch long blades. Setting 6x6 Heavy Fence Posts with Bobcat Auger and some fun!. compared to actual line posts. Titan Footing Solutions Category. Place concrete tubing forms in the holes and level the footings at about 1 inch above ground level. Using a lightweight handheld ½" electric impact wrench and a 12mm six point socket. I would use an auger the next size up, 8"? And backfill. If you drill a 6" hole for a 6" post, and you drill it slightly off plumb, then you post will be slightly off plumb. Learn how to choose the perfect auger diameter for your landscaping or gardening project with the auger bit size chart below. Compact and level the gravel using a post or 2 x 4. What size auger do I need for fence posts? A 12-inch auger, best attached to a heavy machine, will create a hole large enough for a 6×6 or 4×6 post and plenty of concrete. Auger drills are interchangeable and come in 4-, 6-, 8- or 12-in. I’m building a 6’ tall fence using 4”x6” posts. What size auger bits do I need? If you want to drill a small hole in the wood (for general purpose or home use) all you need is hand wood auger bits (available up to 200 mm or 8″ size). Hard packed soil can inhibit root growth.