Q: What is a nut driver?
A nut driver is a screwdriver-shaped tool with a socket end for turning nuts and bolts rather than screws; this one threads into the smallest insert nut in the line, 4-40, without slipping or marring it.
05H4604 - Driver for 4-40 Insert Nuts
If a slip with a driver while installing an insert nut has ever damaged one of your otherwise finished projects or the hardware itself, you understand the value of this driver. It threads into the insert nut, securely engaging it without any chance of slipping out or marring its face. A shoulder keeps the driver from going too deep.
Made from stainless steel, this driver has a 1/4" hex shank to work with standard drivers and drills, with a groove that allows you to use it with a quick-change bit holder. It works with both slotted and hex-recess nuts.
A nut driver is a screwdriver-shaped tool with a socket end for turning nuts and bolts rather than screws; this one threads into the smallest insert nut in the line, 4-40, without slipping or marring it.
It seats a small fastener securely enough to turn it without the driver slipping, which matters on delicate or finished work where a slip would leave a mark.
The built-in shoulder keeps the driver from going in past the correct depth for the 4-40 nut.
Yes, the 1/4" hex shank fits standard drivers and drills, plus quick-change bit holders.
| Materials | Stainless steel |
| Dimensions | 1/4" hex shank; 4-40 thread |
| Compatibility | None |
| Includes | Nut driver |
| Package Quantity | 1 item |
| Warranty | Lee Valley Satisfaction Guarantee |

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4-40 Insert Nut Driver
If a slip with a driver while installing an insert nut has ever damaged one of your otherwise finished projects or the hardware itself, you understand the value of this driver. It threads into the insert nut, securely engaging it without any chance of slipping out or marring its face. A shoulder keeps the driver from going too deep.
Made from stainless steel, this driver has a 1/4" hex shank to work with standard drivers and drills, with a groove that allows you to use it with a quick-change bit holder. It works with both slotted and hex-recess nuts.