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The Digga RC4 Rock/Earth Combination Auger Bit is the all-conditions upgrade from the A4 — same 2" hex hub, 48" OAL, and 1MDS–4DSS drive compatibility, but with B7 taper teeth (TTD/TTS) that cut clean holes in soft earth while maintaining ripping ability in fracturable rock and compacted material. Digga's knock-in, knock-out taper tooth system makes field tooth changes faster than the PADLOC system on A-series bits. PM-HX-3 MFT hex pilot. For contractors who drill variable conditions and want one bit for the job. Made in Dyersville, Iowa, USA.
| Specification | Value |
|---|---|
| Series | RC4 |
| Hub | 2" hex |
| OAL | 48" |
| Diameters | 6"–36" |
| Teeth | TTD (outer) + TTS (inner) — MFT taper |
| Pilot | PM-HX-3 (MFT hex) |
| Ideal Drives | 1MDS–4DSS |
| Conditions | Earth, clay, asphalt, shale, soft-medium rock |
| Compatible Machines | Skid steers and excavators 0.75T–4.5T |
| Origin | Made in Dyersville, Iowa, USA |
2" hex hub — same drive compatibility as A4 bits. Compatible with 1MDS–4DSS skid steer and excavator drives up to 4.5T. Select RC4 when ground conditions include rock, caliche, or harder clay where A4 teeth wear too quickly.
Compatible with skid steer loaders and compact track loaders with a Universal Quick Attach (SSQA):
| Bobcat | Caterpillar | John Deere | Case |
| New Holland | Takeuchi | Kubota | Gehl |
Same drive compatibility as A4 — 1MDS through 4DSS. For machines 0.75-4.5T.
|
Q: What is the difference between RC4 and A4?
Both use 2" hex hub and 48" OAL with the same drive compatibility. A4 uses flat chisel teeth (TS system) for earth and clay. RC4 uses B7 taper teeth (TTD/TTS system) for combined earth-to-rock performance. RC4 taper teeth cut clean holes in soil AND fracture rock; A4 flat teeth excel in pure earth but struggle in rock. |
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Q: RC4 vs DR6 for rock drilling?
RC4 is for earth-to-medium rock combination drilling. DR6 uses rotating carbide picks for fracturable to very hard rock. If the majority of drilling is in earth with occasional rock, RC4 is appropriate. For predominantly hard rock conditions, DR6 is the correct choice. |
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Q: Can I use A4 tooth parts on an RC4?
No — RC4 uses TTD-H taper pockets for TTD-3/TTS-3 teeth, and PM-HX-3 hex pilot. A4 uses D665TL pockets for TS-series teeth and PM-SQ pilot. Completely different tooth systems. |
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Q: How does the RC4 taper tooth compare to PADLOC on the A4?
RC4 uses a 1-step taper knock-in/knock-out system. This is faster in the field than PADLOC (which requires pin removal). For high-cycle rock drilling where tooth changes are frequent, the taper system has a speed advantage over PADLOC. |
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Q: What pilot comes with the RC4?
PM-HX-3 MFT hex pilot — same pilot used on RC4 across all diameters. Replacement pilots are available separately under the RC4 Auger Bit Pilot Tooth listing on eskidsteer.com. |
Download Spec Sheet / Product Brochure (PDF)
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