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The Williams / MAI Hollow Bar Couplings feature a direct end-to-end bearing between each bar, reducing energy loss and ensuring maximum percussion energy at the drill bit. The coupling’s unique, patented design also provides a convenient center-stop for guaranteed 50-50 engagement onto each bar. O-Ring seals in each coupling prevent leakage during continuous drilling and grouting installations.
Caution: When field cutting of bars is required, precision cutting at right angles is necessary to ensure end-to-end bearing. If possible, however, Williams / MAI recommends cut ends to be engaged in the drill bit or at the opposite end with the plate and nut.
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EX Drill Bit |
Hardened cross cut drill bit, suitable for the majority of applications including narrow bands of soft rock.
Soil Types: Fills, Shales, and Gravels |
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ESF Drill Bit |
Hardened hemispherical button profile drill bit suitable for gravels and medium strength rock.
Rock Types: Soft to Medium Rock |
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EXX Drill Bit |
Tungsten carbide cross-cut drill bit. Excellent choice for majority of granular soils with mixed hard formations.
Soil Types: Fills, Gravels, and seamy rock formations. |
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ESSF Drill Bit |
Tungsten carbide hemispherical button drill bit for moderately strong to strong rock, boulders and rubble.
Rock Types: Mudstone, Limestone, and Granite |
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XX Drill Bit |
Two stage cross cut drill bit, suitable for loose ground and fills.
Soil Types: Sand, Clay and Medium Dense Gravels |
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Anchor
Designation
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Drill Bits |
| EX |
EXX |
ESF |
ESSF |
XX |
| R 25 |
- |
2"
(51 mm) |
- |
- |
- |
| R 32 |
2", 3"
(51 mm, 76 mm) |
2-1/2", 3"
(64 mm, 76 mm) |
2"
(51 mm) |
2"
(51 mm) |
- |
| R 38 |
3", 3-1/2"
(76 mm, 90 mm) |
3", 3-1/2". 4"
(76 mm, 90 mm, 100 mm) |
- |
3"
(76 mm) |
4-1/2"
(110 mm) |
| R 51 |
- |
3-1/2". 4"
(90 mm, 100 mm) |
4"
(100 mm) |
4"
(100 mm) |
4-1/2"
(110 mm) |
| T 76 |
- |
5". 6"
(125 mm, 150 mm) |
- |
- |
7"
(175 mm) |
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Williams Form Engineering Corp. All rights reserved.
