Ko-ken

Ko-ken is a Japanese socket-tool specialist. This page groups the Ko-ken tools we stock by type and drive size, so you can jump to the right model. Every item is genuine Japanese-market stock, shipped from Japan with tracking.

Ko-ken guide: models and how to choose ↓

118 productos

Ko-ken guide: models and how to choose

Specs below are taken from each product title and page. Open the product for the full specification. Not sure which Ko-ken line you need? Read the Ko-ken tools guide (Z-EAL, Nut Grip, Bolt Twister, Attack Driver).

Ko-ken ratchet handles

Model Drive Type Teeth Length
3726Z (Z-EAL) 3/8" (9.5 mm) Flex head 72 178 mm
3726Z-280 (Z-EAL) 3/8" (9.5 mm) Long flex head 72 280 mm
3725Z-280 (Z-EAL) 3/8" (9.5 mm) Long handle 72 280 mm
3776N 3/8" (9.5 mm) Flex head 45 280 mm
3726ZB / 3726ZB-280 (Z-EAL) 3/8" (9.5 mm) Ratchet handle Not confirmed Not confirmed
3753N 3/8" (9.5 mm) Ratchet handle Not confirmed Not confirmed
4725Z (Z-EAL) 1/2" (12.7 mm) Ratchet handle Not confirmed Not confirmed
4749N-250 / 4749N-380 1/2" (12.7 mm) Ratchet handle Not confirmed Not confirmed
4750N / 4753N 1/2" (12.7 mm) Ratchet handle Not confirmed Not confirmed
4753P-410 1/2" (12.7 mm) Long ratchet handle Not confirmed Not confirmed
171SB-1/2 1/2" (12.7 mm) Short ratchet with spanner Not confirmed 250 mm

Also: 171-17X19 ratchet spud wrench (double-ended, 17 x 19 mm) and the R810D ratchet bit driver and socket set (17 pcs). Side-by-side specs with KTC: 3/8" ratchets compared and 1/2" ratchets compared. For cramped spots, see ratchet tools for tight spaces.

Ko-ken socket sets by drive size

Drive Sets
1/4" (6.35 mm) P2285Z (Z-EAL, 4-14 mm, 26 pcs), 2257M (31 pcs), 2250M
3/8" (9.5 mm) 3286Z (Z-EAL, 21 pcs, 7-22 mm, metal case), 3252M, RS3400M/12 (8-19 mm, 12 pcs, 6-point), RS3405M/12 (8-19 mm, 12 pcs, 12-point), RS3300X/8 (semi-deep, 8-19 mm, 8 pcs), SAE set RS3400A/9 (1/4"-3/4", 9 pcs)
1/2" (12.7 mm) RS4400M/10 (10-22 mm, 10 pcs, 6-point), RS4405M/10 (10-22 mm, 10 pcs, 12-point), RS14012M/10-L60

For a cross-brand overview, read 6 Japanese socket sets worth knowing.

Nut Grip sockets

RS3350M/5 (Nut Grip deep socket) and RS3450M/8 (Nut Grip socket), both 3/8" (9.5 mm) drive.

Bit socket sets

Drive Hex bit sockets Torx bit sockets
3/8" (9.5 mm) RS3010M/8-L38, RS3010M/8-L62, RS3010M/8-L100, RS3012M/8-L52 RS3025/8-L50 (T10-T45, 8 pcs), RS3025/9-HOLE (tamper-resistant, T10H-T50H)
1/2" (12.7 mm) RS4010M/10-L50, RS4010M/10-L75, RS4012M/10-L60 -
3/4" (19 mm) Single hex bit sockets, 75 mm: 19 mm, 22 mm, 24 mm -

Ko-ken impact sockets and wheel nut sockets

Series Drive Type Sizes
RS14401M/10 1/2" (12.7 mm) Thin-wall impact socket set, 10 pcs 10-27 mm
RS14301X/10 1/2" (12.7 mm) Thin-wall impact semi-deep set 10-27 mm
14201M 1/2" (12.7 mm) Thin-wall wheel nut socket set 17 / 19 / 21 mm
14218M 1/2" (12.7 mm) Double-ended wheel nut socket set 19 x 21 mm
16400M (6-point) 3/4" (19 mm) Impact socket 17, 19, 21, 22, 24 mm
16405M (12-point) 3/4" (19 mm) Impact socket 17, 19, 21, 22, 24 mm
16300M (6-point) 3/4" (19 mm) Impact deep socket 17, 19, 21, 22, 24 mm
18405M (12-point) 1" (25.4 mm) Impact socket 27, 30, 32, 36 mm

Attack Driver hand impact drivers

Model Drive Contents
3112G 3/8" (9.5 mm) Attack Driver (driver only)
AG318A 3/8" (9.5 mm) Set, 6 pcs
4112G 1/2" (12.7 mm) Attack Driver (driver only)
AG112A / AN112A 1/2" (12.7 mm) Set, 6 pcs each
AN112C 1/2" (12.7 mm) Set, 8 pcs
AG112H 1/2" (12.7 mm) Set, 18 pcs
AG112F 1/2" (12.7 mm) Set

Nut Twister, Bolt Twister and stud pullers

Nut and bolt extractor sets:

  • Nut Twister (nut extractor) sets: RS31278 (3/8", 8-16 mm, 8 pcs) and RS41276 (1/2", 17-25.4 mm, 6 pcs)
  • Bolt Twister (bolt extractor) sets: RS3129/6-L60 (3/8", 2-10 mm, 6 pcs), RS4129/5-L37 (1/2", 8-16 mm, 37 mm long), RS4129/5-L75 (1/2", 8-16 mm, 75 mm long)
  • Stud puller set: 4211M (1/2", M6-M12, 4 pcs)

Ko-ken extension bars, breaker bars and handles

Type Models
Extension bar sets PK2760/6 (1/4"), PK3760/6 (3/8"), PK4760/5 (1/2")
Offset extension bar sets PK2763/6 (1/4"), PK3763/6 (3/8"), PK4763/5 (1/2")
Single extension bars, 1/2" 4760-250 (250 mm), 4760-300 (300 mm); offset: 4763-250, 4763-400 (400 mm)
Extension bars, 3/4" 6760-100, 6760-150, 6760-200, 6760-300, 6760-400 (length in mm = last digits)
Breaker bars (spinner handles), 1/2" 4768N: 300, 380, 450, 600 mm; 4768P: 380, 450, 600 mm; Z-EAL 4768Z-430 (430 mm)
L-handles and T-handles 4788-300, 4788-450 (1/2" L-handles), 6788 (3/4", 330 mm), sliding T-handles 4785 (1/2", 300 mm) and 6785 (3/4", 500 mm), free-turn cross wrench 4711XZ (Z-EAL, 1/2", 264 mm)

Other Ko-ken tools

How to choose

Pick the drive size first. 1/4" suits small fasteners, 3/8" is the everyday size, 1/2" is for larger bolts and more leverage, and 3/4" and 1" are for heavy impact work. Sockets and ratchets of the same drive size work together, even across brands.

6-point or 12-point. Both are listed above for the 3/8" and 1/2" sets (RS3400M vs RS3405M, RS4400M vs RS4405M). Check the fasteners you work on before choosing.

Damaged nuts and bolts. See the Nut Twister, Bolt Twister and stud puller sets above.

Ko-ken or KTC? Both are Japanese makers of sockets and ratchets. Read KTC vs Ko-ken or browse KTC tools.

Browse by tool type (all brands)

Ratchet handles · Sockets and socket sets · Extensions and drive handles · Screw and bolt extractors · Manual impact drivers · Hex and Torx keys