Ideal drives
13DDS – 30DDS
Ideal speed — earth
55–65 RPM
Model
RC11
Guaranteed Fit
Fast Shipping
Hassle-Free Returns
Description
Made in USA
Teeth & pilot included
Overview
This heavy-duty rock auger bit is the Digga RC11, and the difference from the RC10 is the head: a larger B8 casting that takes TTL-3 extra heavy duty tungsten teeth rather than the TTD-3 the RC10 uses. It is built for combination drilling where the rock end of the range dominates — hard fracturable rock on 20–30 tonne machines — and it is the auger Digga specifies for the SD Supa drives.
Key Features of the Digga RC11 Auger Bit
- The RC11 ships on a 4" (100mm) square hub on this listing — the hub is what decides which Digga drives it fits
- 12 diameters available, from 9" to 48"
- Drilling conditions: Heavy-duty combination rock / earth
- Overall length: 60"
- Flight thickness (lead): 5/8"
- Teeth: TTL
- Pilot: PH-3XL
- Max diameter: 78"
- Pin, clip, teeth and pilot included — no separate wear-part order needed to drill
- TRU-CUT geometry — the auger cuts its nominal diameter rather than an oversized hole you backfill with concrete
Why This RC11 Bit Earns Its Place
- The B8 head takes TTL-3 teeth, which are a heavier tooth than anything the RC10 accepts — that is the whole reason the RC11 exists.
- Specified for the SD Supa drives as well as the 20DDS through 30DDT range, so it covers Digga’s heaviest machines.
- 5/8" flighting to carry the load a B8 head generates.
- Still a combination bit — it cuts earth as well as rock, unlike the DR11 which is rock-only.
Digga RC11 Auger Bit Specifications
| Specification | Value |
|---|---|
| Model | RC11 |
| Drilling conditions | Heavy-duty combination rock / earth |
| Hub (optional) | 3" Hex |
| Ideal drives | 13DDS – 30DDS |
| Ideal speed — earth | 55–65 RPM |
| Ideal speed — clay | 45–55 RPM |
| Ideal speed — shale / fracturable rock | 25–45 RPM |
| Ideal speed — heavy rock | 10–25 RPM |
| Overall length | 60" |
| Flight thickness (lead) | 5/8" |
| Flight thickness (carry) | 5/8" |
| Teeth | TTL |
| Pilot | PH-3XL |
| Max diameter | 78" |
| Carrier weight range | 20-30T (44,000-60,000 lbs) |
Every figure above comes from Digga’s published data sheet for the RC11. Teeth and pilot are consumable items and are replaceable individually.
Choosing Your RC11
The RC11 is ordered by the choices below; the head and body are the same in every one.
Diameter
- 9"
- 10"
- 12"
- 14"
- 16"
- 18"
- 20"
- 24"
- 30"
- 36"
- 40"
- 48"
Hub
- 4" Square Hub
Diameter guidance: the RC11 spans 9" to 48". On the largest machines the practical limit is stability at reach, not the bit.
Which Digga Drives Take the RC11?
Runs on a 100mm square hub and is Digga’s recommended auger for the SD Supa range as well as 20DDS through 30DDT. XO40 and XT40 extensions add depth for piling.
What Machine Do I Need?
The RC11 is an auger bit, not a machine attachment — it fits the auger drive, and the machine underneath is whatever runs that drive. It needs a Digga drive with a 100mm square output shaft — the 20DDS through 30DDT, or an SD Supa drive.
Add your drive model at checkout and we check the hub matches before the order ships. Stay within the maximum drilling diameter published for your drive and machine class.
Digga RC11 Auger Bit Questions, Answered
When is the RC11 worth the step up from the RC10?
When hard fracturable rock is the norm rather than an occasional surprise. The RC11’s B8 head takes TTL-3 extra heavy duty teeth that hold an edge in material where TTD-3 teeth wear quickly. In earth and medium rock the RC10 does the same job for less.
Are the teeth and pilot included?
Yes. Every Digga auger bit ships with pin, clip, teeth and pilot fitted. All of those are consumable and replaceable individually, so a worn head is a wear-part order rather than a new bit.
Does a 12" auger really drill a 12" hole?
That is what Digga’s TRU-CUT head geometry is for. Many augers cut oversize, which means every hole gets backfilled with more concrete than the design called for. Holding the nominal diameter is a direct materials saving across a pier job.
How do I drill deeper than the bit length?
Digga XO40 and XT40 extensions stack in one-foot increments, which is cheaper than buying a longer auger for occasional deep holes and easier to transport. They fit between the drive and the RC11.
RC11 or DR11 for hard rock?
The RC11 is a combination bit — it still cuts earth. The DR11 is a dedicated rock auger with rotating carbide bullet teeth for shale, permafrost and very hard rock, and it is not suited to soft ground. If every hole is rock, the DR11; if the rock is one layer among several, the RC11.
Will this fit my machine?
Check three things: it is built for 20-30T (44,000-60,000 lbs). Add your machine make and model at checkout and we confirm the fit before the order ships.
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.
Buyers find the RC11 searching for a excavator auger bit, an piling auger bit, or a specific size such as an auger teeth. It also comes up alongside excavator auger when a worn head needs refreshing rather than replacing, and against skid steer auger bit when someone is choosing between bit families. The RC11, like the rest of the range, is genuine digga auger tooling made in Dyersville, Iowa.
Digga Auger Bits Guide Video
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Returns
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