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The minimum hollow stem auger sizes recommended for installation of 2-inch diameter casing is 4.25 inches; however, larger hollow stem auger sizes may be necessary. The Environmental Protection Agency recommends the inner diameter of the auger be 3 inches to 5 inches greater than the outer diameter of the casing.


Augers tool string diagram

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Parts

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Drive Pin

.625 Diameter, 2.875 Tube

MN: 600616

HSA Auger Connecting Pin

1-5/8 in. Hex, 77/66 Series Machines

MN: 600193

4.25 in. HSA Drive Cap

1-5/8 Hex Drive

MN: 239002

4.25 in. HSA Cutter Head

8.75 in. OD, Spade / Bullet

MN: 600155

Nut Hex

3/4-10NC GR5 ZN

MN: 101227

4.25 in. HSA Pilot Bit

Bullet 3.38 Reg Pin

MN: 600672

4.25 in. HSA Pilot Bit

Apex 3.38 Reg Pin

MN: 600156

AWJ Drill Rod

60 in.

MN: 236534

AWJ Drill Rod

24 in.

MN: 238501

AWJ Drill Rod

12 in.

MN: 238499

4.25 in. Auger Puller

Legacy GH60, 6712DT, 7822DT, 6011DT

MN: 202187

4.25 in. HSA Flange Puller

3230DT & 8040DT

MN: 208829

Adjustable Center Rod Clamp

1.25 in. Center Rod

MN: 205182

Drive Pin

.625 Diameter, 2.875 Tube

MN: 600616

HSA Auger Connecting Pin

1-5/8 in. Hex, 77/66 Series Machines

MN: 600193

4.25 in. HSA Drive Cap

1-5/8 Hex Drive

MN: 239002

4.25 in. HSA Cutter Head

8.75 in. OD, Spade / Bullet

MN: 600155

Nut Hex

3/4-10NC GR5 ZN

MN: 101227

4.25 in. HSA Pilot Bit

Bullet 3.38 Reg Pin

MN: 600672

4.25 in. HSA Pilot Bit

Apex 3.38 Reg Pin

MN: 600156

AWJ Drill Rod

60 in.

MN: 236534

AWJ Drill Rod

24 in.

MN: 238501

AWJ Drill Rod

12 in.

MN: 238499

4.25 in. Auger Puller

Legacy GH60, 6712DT, 7822DT, 6011DT

MN: 202187

4.25 in. HSA Flange Puller

3230DT & 8040DT

MN: 208829

Adjustable Center Rod Clamp

1.25 in. Center Rod

MN: 205182