Ko-Ken KO3400MZ05.5H Z-Series 6-Point Socket, 5.5 mm, 3/8 in Drive
Available
The Ko-Ken 3400MZ is a Z-series 6-point socket with a 3/8 in square drive. (manufacturer-stated)
Sizes run from 5.5 to 22 mm.
Lengths are 19 to 23 mm. (manufacturer-stated)
Each model is listed in the table below with its specifications.
Where this product is used
- Turning metric nuts and bolts with a 3/8 in drive ratchet or handle
- Workshop, maintenance and assembly work on exposed fasteners
- General workshop and maintenance fastening
Features
- 3/8 in square drive (manufacturer-stated)
- 6-point (hexagon) opening (manufacturer-stated)
- Listed in the Z-Series section of the catalogue (manufacturer-stated)
- Designed 5 to 9 mm shorter than the standard 3400M, for working in confined and tight areas (manufacturer-stated)
Common specifications
| Specification | Detail |
|---|---|
| Drive | 3/8 in (manufacturer-stated) |
| Opening | 6-point (manufacturer-stated) |
Key specifications
| Model | Size | Length | Weight |
|---|---|---|---|
| KO3400MZ05.5H | 5.5 mm | 19 mm (manufacturer-stated) | 16 g (manufacturer-stated) |
| KO3400MZ06H | 6 mm | 19 mm (manufacturer-stated) | 17 g (manufacturer-stated) |
| KO3400MZ07H | 7 mm | 19 mm (manufacturer-stated) | 17 g (manufacturer-stated) |
| KO3400MZ08H | 8 mm | 20 mm (manufacturer-stated) | 17 g (manufacturer-stated) |
| KO3400MZ10H | 10 mm | 20 mm (manufacturer-stated) | 18 g (manufacturer-stated) |
| KO3400MZ11H | 11 mm | 21 mm (manufacturer-stated) | 18 g (manufacturer-stated) |
| KO3400MZ12H | 12 mm | 21 mm (manufacturer-stated) | 19 g (manufacturer-stated) |
| KO3400MZ13H | 13 mm | 21 mm (manufacturer-stated) | 19 g (manufacturer-stated) |
| KO3400MZ14H | 14 mm | 21 mm (manufacturer-stated) | 20 g (manufacturer-stated) |
| KO3400MZ15H | 15 mm | 21 mm (manufacturer-stated) | 24 g (manufacturer-stated) |
| KO3400MZ16H | 16 mm | 21 mm (manufacturer-stated) | 28 g (manufacturer-stated) |
| KO3400MZ17H | 17 mm | 21 mm (manufacturer-stated) | 32 g (manufacturer-stated) |
| KO3400MZ18H | 18 mm | 22 mm (manufacturer-stated) | 38 g (manufacturer-stated) |
| KO3400MZ19H | 19 mm | 22 mm (manufacturer-stated) | 41 g (manufacturer-stated) |
| KO3400MZ21H | 21 mm | 23 mm (manufacturer-stated) | 51 g (manufacturer-stated) |
| KO3400MZ22H | 22 mm | 23 mm (manufacturer-stated) | 58 g (manufacturer-stated) |
Lengths and weights are manufacturer-stated (Ko-ken catalogue 2025-26).
Selecting the right option
Match the 3/8 in square drive to your ratchet or handle, then choose the size that fits the fastener. The catalogue's safety notes say to select impact sockets only for electric or air impact wrenches and not to substitute hand sockets for impact sockets; this series is listed in the hand sockets section of the catalogue. (manufacturer-stated)
Related products
Related Ko-Ken products: Ko-Ken 3300MZ Z-Series 6-Point Deep Socket, Metric Sizes, 3/8 in Drive, Ko-Ken 3300XZ Z-Series 6-Point Semi-Deep Socket, Metric Sizes, 3/8 in Drive, Ko-Ken 3400M 6-Point Socket, Metric Sizes, 3/8 in Drive, Ko-Ken 3400M-24 6-Point Socket, Metric Sizes, 3/8 in Drive and Ko-Ken 3000-60 Phillips Bit Socket, 3/8 in Drive.
Resources
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5.5mm socket
Model Number: KO3400MZ05.5H
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6mm socket
Model Number: KO3400MZ06H
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7mm socket
Model Number: KO3400MZ07H
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8mm socket
Model Number: KO3400MZ08H
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10mm socket
Model Number: KO3400MZ10H
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11mm socket
Model Number: KO3400MZ11H
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12mm socket
Model Number: KO3400MZ12H
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13mm socket
Model Number: KO3400MZ13H
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14mm socket
Model Number: KO3400MZ14H
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15mm socket
Model Number: KO3400MZ15H
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16mm socket
Model Number: KO3400MZ16H
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17mm socket
Model Number: KO3400MZ17H
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18mm socket
Model Number: KO3400MZ18H
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19mm socket
Model Number: KO3400MZ19H
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21mm socket
Model Number: KO3400MZ21H
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22mm socket
Model Number: KO3400MZ22H
