Ko-Ken KO3129-60-2 Bolt Twister Socket, 2 mm, 60 mm Long, 3/8 in Drive
Available
The Ko-Ken 3129 Bolt Twister socket removes a broken bolt whose head has come off. It is made in sizes 2, 3, 4, 6, 8 and 10 mm in 32 mm and 60 mm lengths (manufacturer-stated). Each has a 3/8 in drive.
The catalogue says to use the Bolt Twister to remove a broken bolt whose head has come off: drill a hole in the centre of the broken bolt, insert the Bolt Twister into the hole and turn it counterclockwise until it sticks, then continue turning to remove the bolt (manufacturer-stated).
The chart below gives the bolt size and drill size for each Bolt Twister size.
The 3/8 in drive comes from the store listing; the catalogue page prints the sizes and lengths but not a drive size, and it does not say whether the sockets are for hand or impact use.
Where this product is used
- Removing broken bolts whose heads have come off
- Repair and maintenance work on machinery and vehicles
- Workshop and maintenance work
Features
- Sizes 2 to 10 mm
- 3/8 in drive
- 32 mm and 60 mm lengths (manufacturer-stated)
- Spiral edges that grip the broken bolt (manufacturer-stated)
Common specifications
| Specification | Detail |
|---|---|
| Drive | 3/8 in |
Bolt size and drill size (manufacturer-stated)
| Bolt Twister size | Bolt size | Drill size (mm) |
|---|---|---|
| 2 | M5 | 2.4 to 2.6 |
| 3 | M6 | 3.2 to 3.5 |
| 4 | M8 | 4.2 to 4.5 |
| 6 | M10 to M12 | 6.2 to 6.5 |
| 8 | M14 to M16 | 8.2 to 8.5 |
| 10 | M18 to M20 | 10.2 to 10.5 |
Key specifications
| Model | Size | Length | Weight |
|---|---|---|---|
| KO3129-32-3 | 3 mm | 32 mm (manufacturer-stated) | 33 g (manufacturer-stated) |
| KO3129-32-4 | 4 mm | 32 mm (manufacturer-stated) | 33 g (manufacturer-stated) |
| KO3129-32-6 | 6 mm | 32 mm (manufacturer-stated) | 35 g (manufacturer-stated) |
| KO3129-32-8 | 8 mm | 32 mm (manufacturer-stated) | 37 g (manufacturer-stated) |
| KO3129-32-10 | 10 mm | 32 mm (manufacturer-stated) | 40 g (manufacturer-stated) |
| KO3129-60-2 | 2 mm | 60 mm (manufacturer-stated) | 38 g (manufacturer-stated) |
| KO3129-60-3 | 3 mm | 60 mm (manufacturer-stated) | 42 g (manufacturer-stated) |
| KO3129-60-4 | 4 mm | 60 mm (manufacturer-stated) | 44 g (manufacturer-stated) |
| KO3129-60-6 | 6 mm | 60 mm (manufacturer-stated) | 47 g (manufacturer-stated) |
| KO3129-60-8 | 8 mm | 60 mm (manufacturer-stated) | 53 g (manufacturer-stated) |
| KO3129-60-10 | 10 mm | 60 mm (manufacturer-stated) | 64 g (manufacturer-stated) |
Lengths and weights are manufacturer-stated (Ko-ken catalogue 2025-26).
Selecting the right option
Pick the Bolt Twister size from the chart using the bolt size, and drill the hole to the matching drill size. The 32 mm and 60 mm lengths are separate models; choose the length to suit access to the broken bolt. The catalogue does not say whether this series is for hand or impact use, so check before using it with a power tool.
Related products
Related Ko-Ken products: Ko-Ken 3127 Nut Twister Socket, 8 to 17 mm, 3/8 in Drive, Ko-Ken 4127 Nut Twister Socket, 14 to 25.4 mm, 1/2 in Drive, Ko-Ken RS3129/6-L32 Bolt Twister Set on Rail, 6 Pieces, 3/8 in Drive and Ko-Ken RS4129/5-L37 Bolt Twister Set on Rail, 5 Pieces, 1/2 in Drive.
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2 / 60mm socket
Model Number: KO3129-60-2
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3 / 32mm socket
Model Number: KO3129-32-3
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3 / 60mm socket
Model Number: KO3129-60-3
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4 / 32mm socket
Model Number: KO3129-32-4
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4 / 60mm socket
Model Number: KO3129-60-4
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6 / 32mm socket
Model Number: KO3129-32-6
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6 / 60mm socket
Model Number: KO3129-60-6
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8 / 32mm socket
Model Number: KO3129-32-8
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8 / 60mm socket
Model Number: KO3129-60-8
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10 / 32mm socket
Model Number: KO3129-32-10
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10 / 60mm socket
Model Number: KO3129-60-10
