Suits drives
Digga 1MDS – 4DSS
Overall length
48"
Model
A4
Guaranteed Fit
Fast Shipping
Hassle-Free Returns
Description
Made in USA TRU-CUT
Overview
The Digga A4 skid steer auger bit is a general-purpose auger built for earth, clay and shale, available in twelve diameters from 6" to 36" on a 48" overall length with a 2" hex hub. Two tooth configurations decide which you order: Light Conditions – Earth uses TS bladed teeth for general soil, while Heavy Conditions – Hard Ground fits multi-faced tungsten (MFT) teeth brazed onto the tooth face for longer wear life and greater cutting performance in compacted and abrasive ground. Digga’s TRU-CUT head geometry means a 12" auger drills a 12" hole rather than an oversized one you backfill with concrete. Every bit ships with pin, clip, teeth and pilot fitted, and suits Digga 1MDS through 4DSS drives on carriers from 0.75 to 4.5 tonnes.
Key Features of the Digga A4 Earth Auger Bit
- Twelve diameters, 6" to 36" — 48" overall length across the range
- Two tooth options — TS bladed teeth for earth, clay and shale; MFT multi-faced tungsten for hard and abrasive ground
- TRU-CUT design — a 12" auger drills a 12" hole, with no oversized hole to backfill
- 2" hex hub — fits Digga 1MDS through 4DSS drives
- Heavy-duty tube in highest-grade steel with 5/16" lead and carry flights
- Shallow-pitch flights — optimum spoil removal and retention on lift-out
- Pipe diameter 2.375"–4.5" depending on bit size
- Square-drive PM-SQ pilot — positive fitment for stronger engagement and better breakout
- Pin, clip, teeth and pilot included — no separate wear-part order to drill
- Extensions available — Digga XO20 outer extensions add depth in one-foot increments
Why This Skid Steer Auger Bit Outperforms a Generic One
- A true-diameter hole is a direct concrete saving — an auger that cuts oversize on every pier costs you the extra volume of concrete on every pier. TRU-CUT geometry holds the nominal diameter.
- Choosing MFT teeth doubles down on wear life where it matters — multi-faced tungsten brazed onto the tooth face is what separates a bit that survives compacted clay from one that needs teeth every few holes.
- Shallow-pitch flighting keeps spoil on the auger — deep-pitch flights drop material back down the hole on lift-out, so you re-drill the same spoil. Shallow pitch carries it out first time.
- Teeth and pilot are replaceable rather than the whole bit — a TS-1 outer tooth or PM-SQ-1 pilot is a consumable, so the tube and flights stay in service.
- The square-drive pilot resists walking on start — a positive-fitment pilot places the hole where you set it instead of wandering off the mark in loose surface material.
Digga A4 Auger Bit Specifications
| Specification | Value |
|---|---|
| Model | A4 |
| Drilling conditions | General — earth, clay, shale |
| Available diameters | 6", 8", 9", 10", 12", 14", 16", 18", 20", 24", 30", 36" |
| Overall length | 48" |
| Hub | 2" Hex |
| Pipe diameter | 2.375" – 4.5" |
| Flight thickness (lead) | 5/16" |
| Flight thickness (carry) | 5/16" |
| Teeth — Light Conditions (Earth) | TS-1 outer / TS-C-1 inner |
| Teeth — Heavy Conditions (MFT) | TS-3 outer / TS-C-3 inner |
| Pilot — Light Conditions | PM-SQ-1 |
| Pilot — Heavy Conditions | PM-SQ-3 |
| Suits drives | Digga 1MDS – 4DSS |
| Carrier range | 0.75–4.5T (1,600–9,900 lbs) |
| Included | Pin, clip, teeth and pilot |
| Suitable extension | XO20 (2" hex) |
A4 Ideal Drilling Speed by Ground Condition
| Ground condition | Ideal drilling speed |
|---|---|
| Earth | 55–65 RPM |
| Clay | 45–55 RPM |
| Fracturable rock | 20–45 RPM |
The A4 is a general-purpose earth auger and is not suited to harder fracturable rock — for combination rock and earth drilling, the RC4 taper-tooth bit is the correct choice.
Choosing Your A4 Diameter and Tooth Configuration
| Model option | Teeth fitted | Pilot | Best suited to |
|---|---|---|---|
| Light Conditions – Earth | TS-1 outer, TS-C-1 inner — bladed steel | PM-SQ-1 | General earth, loam, sand, soft clay and shale |
| Heavy Conditions – Hard Ground | TS-3 outer, TS-C-3 inner — multi-faced tungsten (MFT) | PM-SQ-3 | Compacted and hard ground, abrasive soils, granulated or soft fracturable rock |
Diameter guidance: 6"–12" for fence posts and sign posts; 14"–24" for deck footings and pier foundations; 30"–36" for larger commercial piers on machines with the torque and down-pressure to turn them. All twelve diameters share the same 48" overall length and 2" hex hub.
Which Digga Drives Take the A4 Auger Bit?
The A4 uses a 2" hex hub and suits Digga 1MDS through 4DSS drives — covering the 1DSS, 2DSS, 3DSS and 4DSS standard-flow range and the 1MDS mini machine drive. Digga XO20 outer extensions add drilling depth beyond the 48" bit length in one-foot increments without buying a longer auger. Check the maximum drilling diameter published for your drive and machine class before selecting a large bit.
What Machines Can Run an A4 Auger Bit?
The A4 is an auger bit, not a machine attachment — compatibility is to the auger drive it mounts on, not directly to a carrier. Digga rates the A4 range for drives fitted to micro and mini excavators, skid steer loaders and mini loaders from 0.75 to 4.5 tonnes (1,600–9,900 lbs).
You need a Digga auger drive with a 2" hex output shaft — the 1MDS, 1DSS, 2DSS, 3DSS or 4DSS. Larger drives use a 2.5" or 3" hex shaft and take the A6 or A8 bit range instead. Add your drive model at checkout and we check the hub matches before the order ships. Stay within the maximum drilling diameter your drive and machine class supports.
Digga A4 Auger Bit Questions, Answered
Should I choose Light Conditions or Heavy Conditions teeth?
Choose Light Conditions – Earth (TS-1 / TS-C-1 bladed teeth) for general soil, loam, sand and soft clay. Choose Heavy Conditions – Hard Ground for compacted, abrasive or granulated ground: it fits TS-3 and TS-C-3 multi-faced tungsten teeth brazed onto the tooth face, which hold an edge far longer in punishing material. If you regularly hit fracturable rock, the RC4 combination bit is the better tool than either A4 option.
What diameter auger do I need?
For 4x4 and 6x6 fence posts, 6" to 12" covers most work. Deck footings and pier foundations usually call for 14" to 24". Commercial piers run 30" to 36", but only on a drive and carrier with the torque and down-pressure to turn that diameter — check your drive’s published maximum drilling diameter first.
Will the A4 fit my auger drive?
The A4 has a 2" hex hub and fits Digga 1MDS through 4DSS drives. If your drive has a 2.5" or 3" hex output shaft, you need the A6 or A8 range instead. Digga also offers hex adapters if you are matching a bit to a different shaft size.
Does a 12" A4 really drill a 12" hole?
Yes — that is what Digga’s TRU-CUT head geometry is for. Many augers cut oversize, which means backfilling every hole with more concrete than the design called for. The A4 holds its nominal diameter.
Are teeth and the pilot included?
Yes. Every A4 ships with pin, clip, teeth and pilot fitted. Replacements are available separately — TS-1 and TS-C-1 teeth with the PM-SQ-1 pilot for the earth configuration, TS-3 and TS-C-3 with the PM-SQ-3 pilot for the MFT configuration.
How deep can I drill with a 48" auger?
The A4 is 48" overall, so usable depth is less than that once the drive and hub are accounted for. Digga XO20 outer extensions add depth in one-foot increments — stack them to reach the depth you need rather than buying a longer bit for occasional deep work.
What drilling speed should I run?
Digga publishes 55–65 RPM in earth, 45–55 RPM in clay and 20–45 RPM in fracturable rock. Slowing down in harder ground protects the teeth and gives a cleaner hole.
What is the difference between the A4 and the RC4?
The A4 is a general-purpose earth auger with bladed teeth, ideal for earth, clay and shale but not suited to harder fracturable rock. The RC4 is an all-purpose taper-tooth bit with double tungsten teeth on the outside and single taper teeth inside, designed for combination drilling from earth through to medium rock.
Can I replace just the teeth when they wear?
Yes — teeth and the pilot are the consumable items and are replaceable individually, so the tube and flights stay in service. That is why they are stocked as separate part numbers.
How is shipping calculated?
Shipping is calculated at checkout — add the item to your cart, enter your delivery address, and the shipping charge is shown before you complete your order. Lift gate service is available for residential deliveries and can be selected at checkout.
How do I order?
Add the item to your cart and check out online — the order page asks for your machine make and model, so there is no need to call ahead. We check the mount against your machine after the order and come back to you if anything needs changing. If you would rather ask first, email support@eskidsteer.com or use the chat button on your screen.
The A4 is the general-purpose member of the Digga auger bit family. Contractors searching for an earth auger bit, a skid steer auger bit, or specifically an auger bit 12 inch for deck footings will find that size in this listing. Replacement auger teeth are stocked separately so a worn head is a consumable rather than a new bit, and the same range serves as a mini excavator auger bit on smaller carriers or a skid steer post hole digger bit on full-size machines.
Digga A4 Auger Bit Downloads
Digga Auger Bits Guide Video
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