Skid Steer Augers Post Hole Diggers | Forge Claw

What Are Skid Steer Augers and Post Hole Diggers?

Skid steer augers and post hole diggers are hydraulic-powered drilling attachments that connect to a skid steer loader's universal quick-attach plate and auxiliary hydraulics to bore holes for posts, footings, and piers. These attachments replace manual post hole diggers and towable auger units with a single machine-mounted system.

Every skid steer auger attachment consists of 2 primary components: the auger drive unit (a hydraulic motor coupled to a planetary gearbox) and the interchangeable auger bit. The drive unit mounts to the quick-attach plate. The bit threads or pins onto the drive unit's output shaft.

How Does a Skid Steer Auger Attachment Work?

A skid steer auger attachment converts auxiliary hydraulic flow into rotational force through a planetary gearbox, spinning the auger bit to cut and lift soil out of the hole. Hydraulic oil flows from the machine's auxiliary couplers into the drive motor, through a planetary gear reduction of 5:1 to 10:1, and onto the bit.

Planetary gear reduction multiplies torque while reducing RPM. A drive unit receiving 15 GPM at 3,000 PSI produces 2,500 to 4,500 ft-lbs of torque at 80 to 150 RPM — enough force to bore through compacted clay and root-filled soil without stalling the machine.

What Is the Difference Between a Skid Steer Auger and a Post Hole Digger?

In the attachment industry, "skid steer auger" and "post hole digger" refer to the same hydraulic drilling attachment. "Post hole digger" describes the application — digging holes for posts. "Auger" describes the tool type — a helical drilling bit that cuts and evacuates soil.

Some manufacturers also use "earth drill" as a third term for the same equipment category. All 3 terms describe a drive unit paired with a spiral bit, mounted to a skid steer's quick-attach plate and powered by auxiliary hydraulics.

What Types of Skid Steer Auger Post Hole Digger Attachments Are Available?

Skid steer auger post hole digger attachments fall into 3 main categories: standard-flow drive units, high-flow drive units, and specialty auger bits designed for specific soil conditions. Drive units range from 150 to 350 lbs without a bit attached.

What Are Standard-Flow vs. High-Flow Auger Drive Units?

Standard-flow auger drives operate on 14 to 22 GPM at 2,500 to 3,500 PSI and produce 2,000 to 4,500 ft-lbs of torque. High-flow drives require 24 to 40+ GPM at 3,000 to 4,000 PSI and produce 4,500 to 9,000+ ft-lbs of torque.

• Standard-flow drives handle auger bits up to 18 inches in most soil types
• High-flow drives handle auger bits up to 36 inches in compacted or rocky soil
• Compact skid steers under 2,000-lb operating capacity typically run standard-flow
• Full-size skid steers above 2,500-lb operating capacity often offer high-flow options

What Auger Bit Sizes Can You Get for Skid Steers?

Skid steer auger bits are available in 8 standard diameters: 6-inch, 9-inch, 12-inch, 15-inch, 18-inch, 24-inch, 30-inch, and 36-inch. The 9-inch and 12-inch sizes are the most common for post hole applications.

• Standard bit lengths run 42 inches or 48 inches from cutting tip to shaft collar
• Auger extensions add 24 to 36 inches of depth, reaching 60 to 72+ inches total
• 2-inch hex drive and 2-9/16-inch round drive are the 2 dominant shaft connection types

What Are Rock Augers and When Do You Need One?

Rock augers feature carbide-tipped cutting teeth and reinforced flighting to bore through rocky soil, shale, caliche, and frost where standard earth bits stall or break. Rock auger bits cost 30% to 60% more than standard earth bits of the same diameter.

Upgrade to a rock auger when the job site contains 30%+ rock content, frozen ground deeper than 6 inches, or compacted clay with embedded cobble. Combination bits with both earth-cutting and rock-cutting features handle mixed soil conditions.

What Hydraulic Specifications Does Your Skid Steer Need to Run an Auger?

A skid steer needs a minimum of 14 GPM auxiliary hydraulic flow and 2,500 PSI to run a standard auger drive unit. Mismatched hydraulics are the number-one cause of poor auger performance and premature seal and motor failure.

What GPM and PSI Are Required for Skid Steer Augers?

• Standard-flow auger drives: 14 to 22 GPM at 2,500 to 3,500 PSI, max 18-inch bit, 2,000 to 4,500 ft-lbs torque
• High-flow auger drives: 24 to 40 GPM at 3,000 to 4,000 PSI, max 36-inch bit, 4,500 to 9,000+ ft-lbs torque
• Mini skid steer auger drives: 7 to 15 GPM at 2,000 to 3,000 PSI, max 12-inch bit, 1,200 to 2,500 ft-lbs torque

Exceeding a drive unit's rated maximum flow causes hydraulic oil overheating and accelerates seal damage. Always match the machine's auxiliary flow output to the drive unit's specified operating range.

Which Skid Steer Brands and Models Are Compatible with Auger Attachments?

Any skid steer or compact track loader with a universal quick-attach plate and auxiliary hydraulic couplers runs an auger attachment. Compatible machine manufacturers include Bobcat, Caterpillar, John Deere, Kubota, Case, New Holland, Takeuchi, and ASV.

• Compact machines with 1,300 to 1,900-lb rated operating capacity typically deliver 14 to 20 GPM standard flow
• Mid-size machines with 2,000 to 2,800-lb rated operating capacity deliver 20 to 28 GPM
• Full-size machines with 2,800 to 3,500+-lb rated operating capacity deliver 28 to 40+ GPM high flow
• Mini skid steers from Ditch Witch, Vermeer, and Toro require low-flow drive units rated for 7 to 15 GPM

Does Your Machine Need a Case Drain Line for an Auger?

Most skid steer auger drive units with hydraulic motors require a case drain line to return excess internal leakage oil to the machine's hydraulic tank and prevent motor seal blowout. Operating without a required case drain causes internal pressure buildup that destroys the motor within hours.

Some newer auger drive units feature internal relief valves that eliminate the case drain requirement. Confirm whether a specific drive unit requires a case drain before purchase — this detail determines whether the machine needs a 2-line or 3-line auxiliary circuit.

How Do You Choose the Right Skid Steer Auger Post Hole Digger for Your Job?

3 factors determine the right skid steer auger post hole digger: the machine's auxiliary hydraulic flow rating, the hole diameter the job requires, and the soil conditions at the work site. Match all 3 factors to avoid undersized equipment or wasted capacity.

Which Auger Bit Diameter Matches Which Application?

• 6-inch bit: steel fence posts, metal sign posts, soil sampling
• 9-inch bit: wood fence posts (4x4), small tree plantings
• 12-inch bit: wood fence posts (6x6), deck footings, mailbox posts
• 18-inch bit: large deck footings, light pole bases, small foundation piers
• 24-inch bit: foundation piers, utility pole bases, large tree transplants
• 30-inch to 36-inch bit: commercial foundation piers, solar ground-mount installations, caisson holes

How Deep Can a Skid Steer Auger Dig?

A standard 48-inch auger bit digs holes 42 to 48 inches deep in a single pass. Adding a 24-inch or 36-inch extension reaches 60 to 72+ inches. Depth beyond 72 inches requires multiple extensions and progressively slower cycle times.

Most fence post applications require 30 to 42 inches of depth. Foundation pier and utility pole installations typically require 48 to 72 inches. Frost line depth in northern climates drives the minimum depth requirement for structural footings.

What Torque and RPM Should You Look for in an Auger Drive?

Auger drive torque between 2,500 and 5,000 ft-lbs handles fence post and footing work in standard soil conditions. Foundation piers and rock drilling demand 5,000 to 9,000+ ft-lbs. Output RPM between 80 and 200 delivers optimal soil cutting without throwing material out of control.

What Industries and Applications Use Skid Steer Post Hole Diggers?

8 primary industries use skid steer post hole digger attachments across residential, commercial, agricultural, and municipal job sites.

Why Do Fencing Contractors Rely on Skid Steer Augers?

Fencing contractors drill 50 to 100+ post holes per day with skid steer auger attachments — a rate that requires 3 to 4 laborers with manual diggers. A single operator with a 9-inch or 12-inch auger bit completes a typical residential fence line in one shift.

How Do Landscapers and General Contractors Use Auger Attachments?

• Landscapers bore holes for tree planting, retaining wall footings, and irrigation sleeves
• General contractors drill deck footings, sign post holes, and foundation piers
• Utility contractors set power poles, telecom poles, and transformer pads
• Agricultural operators install fence lines, gate posts, and feeding station posts across hundreds of acres
• Solar installers bore ground-mount holes for panel racking systems at 24-inch to 36-inch diameters

Browse Forge Claw's Skid Steer Auger & Post Hole Digger Selection

Forge Claw carries professional-grade skid steer auger and post hole digger attachments built for demanding job sites. Drive units, auger bits from 6 inches to 36 inches, rock augers, extensions, and replacement teeth — it's all here. You get expert support from a team that knows hydraulic specs, bit matching, and machine compatibility. Equipment financing available for qualified buyers.

What Makes Forge Claw's Selection Right for Professional Use?

Every auger drive unit and bit in Forge Claw's lineup meets commercial-duty construction standards. You're not sorting through consumer-grade options to find a real tool. The catalog is built for contractors who need the attachment to perform on the first hole and the thousandth.

What Other Products Do Contractors Pair with Skid Steer Augers and Post Hole Diggers?

Contractors regularly combine skid steer auger post hole digger attachments with complementary products to expand capability and reduce changeovers.

Skid Steer Post Hole Diggers

Many operators use skid steer post hole diggers interchangeably with auger attachments since both serve the same core function of boring precise holes for fence posts, sign installations, and foundation work. Both attachments mount to the same universal quick-attach plate and require identical auxiliary hydraulic connections on compact track loaders and skid steers.

Frequently Asked Questions About Skid Steer Augers and Post Hole Diggers

Can You Dig Post Holes with Any Skid Steer?

Any skid steer with auxiliary hydraulic couplers and a universal quick-attach plate runs an auger attachment for digging post holes.

The machine's auxiliary hydraulic flow rating determines which drive unit size the skid steer supports. Compact skid steers with 14 to 20 GPM run standard-flow auger drives with bits up to 18 inches. Full-size machines with 24 to 40+ GPM run high-flow drives with bits up to 36 inches. Skid steers without auxiliary hydraulics cannot power any auger attachment.

How Much Does a Skid Steer Auger Attachment Cost?

Skid steer auger attachment costs range from $1,500 to $5,000+ depending on the drive unit class and included bits.

Standard-flow drive units without bits start between $1,500 and $2,500. High-flow drive units range from $2,500 to $4,500+. Individual earth auger bits cost $200 to $600 depending on diameter. Rock auger bits cost $400 to $1,000+. Complete packages with a drive unit and 2 to 3 bits range from $2,000 to $5,500.

How Do You Maintain a Skid Steer Auger Attachment?

Skid steer auger maintenance requires greasing the gearbox output shaft, inspecting auger teeth, and checking hydraulic hose condition before each use.

Replace worn or missing bolt-on cutting teeth every 200 to 500 holes depending on soil abrasiveness. Inspect the flighting for cracks or bending after each project. Change the gearbox oil every 500 operating hours or per the drive unit manufacturer's schedule. Store the auger bit off the ground to prevent moisture damage to cutting edges.

Do Skid Steer Augers Work in Rocky or Frozen Soil?

Skid steer augers bore through rocky and frozen soil when equipped with carbide-tipped rock auger bits and a high-torque drive unit producing 4,500+ ft-lbs.

Standard earth bits are not designed for rock content above 30% and lose cutting teeth rapidly in frozen ground deeper than 6 inches. Rock auger bits use carbide-tipped conical teeth and reinforced flighting to fracture stone and hardpan. Frozen ground drilling also benefits from pilot bits that score a center hole before the full-diameter bit engages.

How Many Post Holes Can a Skid Steer Auger Dig Per Hour?

A skid steer auger digs 15 to 30 post holes per hour in average soil conditions with a 9-inch or 12-inch bit at 36 inches of depth.

Manual post hole diggers produce 4 to 8 holes per hour with 2 laborers. A towable auger produces 10 to 15 holes per hour with 1 to 2 operators. Skid steer-mounted augers double or triple that rate with a single operator who repositions the machine between holes. Rocky or clay-heavy soil reduces output to 8 to 15 holes per hour even with a properly matched auger.

Browse Forge Claw's full selection of professional-grade skid steer augers and post hole diggers — equipment financing available for qualified buyers.