Ko-Ken KO12400M04 6-Point Impact Socket, 4 mm, 1/4 in Drive

The Ko-Ken 12400M is a 6-point impact socket with a 1/4 in square drive. (manufacturer-stated)

Sizes run from 4 to 14 mm.

Length is 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 1/4 in drive impact wrench
• Workshop, maintenance and assembly work on exposed fasteners
• General workshop and maintenance fastening

Features

• 1/4 in square drive (manufacturer-stated)
• 6-point (hexagon) opening (manufacturer-stated)
• Listed in the Impact Sockets section of the catalogue (manufacturer-stated)
• Retaining pin and O-ring or C-ring parts listed in the catalogue for each size (manufacturer-stated)

Common specifications

Key specifications

Weights are manufacturer-stated (Ko-ken catalogue 2025-26).

Selecting the right option

Match the 1/4 in square drive to your impact wrench, then choose the size that fits the fastener. Dimensions are shown with the labels used in the catalogue table (D1, D2 and H). The catalogue footnotes list these retaining parts for the sockets: pin A21 with O-ring B21. The part for each size is shown in its specifications. The catalogue lists the pins, O-rings and C-rings as separate packs (pages 270 and 271) and does not say whether any are supplied with the socket. (manufacturer-stated) The catalogue's safety notes say to select impact sockets only for electric or air impact wrenches, to wear safety goggles when using nut runners or impact wrenches, never to substitute a hand socket for an impact socket, and to replace sockets with cracked walls, battered points or other marks of wear. (manufacturer-stated)

Related products

Related Ko-Ken products: Ko-Ken 12300M 6-Point Deep Impact Socket, Metric Sizes, 1/4 in Drive, Ko-Ken 12400A 6-Point Impact Socket, Inch Sizes, 1/4 in Drive, Ko-Ken 14400M 6-Point Impact Socket, Metric Sizes, 1/2 in Drive, Ko-Ken Impact Socket Spare Pin and Ko-Ken Impact Socket Spare O-Ring.