Ko-Ken KO18866A Impact Square Drive Adaptor, 1 in female x 3/4 in male

Ko-Ken 14433A, 14466A, 16644A and 18866A are impact square drive adaptors.

Lengths are 37.5 to 67 mm. (manufacturer-stated)

Each model is listed in the table below with its specifications.

Where this product is used

• Using a socket with a handle of a different square drive size
• Workshop and maintenance work where the right-sized handle is not to hand
• General fastener work with sockets and handles of different drive sizes

Features

• Square drive sizes listed in the table
• Listed in the Impact Sockets section of the catalogue (manufacturer-stated)

Key specifications

Drive sizes, lengths and weights are manufacturer-stated (Ko-ken catalogue 2025-26). A dash means the figure is not published on this page.

Selecting the right option

Check the square drive sizes at each end against your handle and socket. The catalogue warns that adapting down from a larger square drive to a smaller one may lead to excessive torque and possibly cause breakage. Always stay within the safe torque of the smaller drive. (manufacturer-stated)

Related products

Related Ko-Ken products: Ko-Ken 2755, 3755, 4755 and 6755 Ratchet Adaptor, 1/4, 3/8, 1/2 and 3/4 in Drive, Ko-Ken 14433A-B and 14466A-B Impact Ball Type Adaptor, Ko-Ken 3322A, 4433A and 8866A Square Drive Adaptor and Ko-Ken 2760, 3760, 4760, 6760 and 8760 Extension Bar, 1/4, 3/8, 1/2, 3/4 and 1 in Drive.