Ko-Ken KO4100M06 Stud Puller, 6 mm, 1/2 in Drive

The Ko-Ken 4100M is a stud puller in 10 metric sizes from 6 to 16 mm. The catalogue lists it under the heading Stud Puller & Setter (manufacturer-stated).

The catalogue says the hexagon body design can lessen the excessive load on the cages and rollers inside the pullers (manufacturer-stated).

The catalogue says the 4100M-16 does not have a 1/2 in square drive; its outer hexagon is driven with 27 mm sockets or ring wrenches (manufacturer-stated).

The 1/2 in square drive for the other sizes comes from the store listing; the catalogue prints the exceptions only.

Each size is listed in the table below with its length and weight.

Where this product is used

• Removing and setting studs
• Engine, machinery and vehicle maintenance
• Workshop repair work

Features

• Sizes 6 to 16 mm
• Lengths of 65 and 75 mm (manufacturer-stated)
• Hexagon body design (manufacturer-stated)
• Weights from 147 to 340 g (manufacturer-stated)

Key specifications

Lengths and weights are manufacturer-stated (Ko-ken catalogue 2025-26).

Selecting the right option

Choose the size that matches the stud. Size 16 mm (KO4100M16) has no square drive. The catalogue says its outer hexagon is driven with 27 mm sockets or ring wrenches (manufacturer-stated).

Related products

Related Ko-Ken products: Ko-Ken 4100A Stud Puller, 1/4 to 5/8 in, Ko-Ken 6100M Stud Puller, 18 to 30 mm, Ko-Ken 4211M Stud Puller Set, 6 to 12 mm, 4 Pieces and Ko-Ken 4211A Stud Puller Set, 1/4 to 1/2 in, 4 Pieces.