Ko-Ken Socket Range — Quick Reference
Ko-Ken is the Japanese precision socket and ratchet brand (est. 1946), manufactured to JIS and ISO standards in chrome molybdenum and chrome vanadium steel. Ko-Ken's close-tolerance machining gives the consistent fastener fit, low ratchet drag and long service life that mechanics and maintenance technicians look for. AIMS stocks the workshop-relevant Ko-Ken range across drive sizes and socket profiles.
| Drive Size | Best For | Common Socket Sizes |
|---|---|---|
| 1/4" Drive | Light precision work, small fasteners | 4 mm - 14 mm metric / 5/32" - 9/16" imperial |
| 3/8" Drive | Workshop default — general automotive + light industrial | 6 mm - 22 mm metric / 1/4" - 7/8" imperial |
| 1/2" Drive | Heavy work — engine bolts, suspension, structural | 8 mm - 36 mm metric / 5/16" - 1-1/4" imperial |
| 3/4" Drive | Truck, heavy plant, industrial maintenance | 17 mm - 55 mm metric / 11/16" - 2" imperial |
| 1" Drive | Heavy industrial, mining, large machinery | 27 mm - 80 mm metric |
Socket profile options: 6-point (better grip on rounded/damaged fasteners), 12-point (faster engagement, common general use). Impact sockets (black oxide) for impact wrenches — never use chrome sockets on impact tools. Ko-Ken Quick-Spin handles allow rapid finger-driven turning. Companion ranges: sockets, impact sockets, ratchet wrenches. For socket selection guide, see our socket set guide.
Ko-Ken Socket Sets, Impact Sockets & Ratchet Wrenches
Ko-Ken is a Japanese precision tool manufacturer established in 1946, producing socket sets, ratchet handles, torque wrenches and speciality hand tools to JIS and ISO standards. Ko-Ken's manufacturing is built on close-tolerance machining from chrome molybdenum and chrome vanadium steel, with a reputation among mechanics and maintenance technicians for consistent socket fit, low ratchet drag and long service life under heavy-duty use. AIMS Industrial stocks Ko-Ken socket sets and ratchet tools for workshops, mine site maintenance and industrial facilities requiring quality Japanese hand tools.
Ko-Ken Socket Sets & Ratchet Wrenches
Ko-Ken socket sets cover all three primary drive sizes -- 1/4", 3/8" and 1/2" drive -- in both metric and AF, with matching ratchet handles built to the same dimensional tolerances.
- Ko-Ken 1/4" Drive Socket Set: Compact metric socket set for tight-access fastener work on instrumentation, small engine components and electrical panel connections; includes ratchet handle, extension bars and hex sockets
- Ko-Ken 1/2" Drive Socket Set: Heavy-duty socket set for industrial maintenance, truck servicing and structural fastener applications; chrome molybdenum construction with 72-tooth ratchet for 5-degree arc swing
- Ko-Ken Ratchet Handle: Fine-tooth ratchet with reversible mechanism and ergonomic knurled grip; chrome vanadium construction with sealed head for resistance to oil contamination in workshop environments
Ko-Ken Impact Sockets & Deep Socket Sets
Ko-Ken impact sockets are hardened to resist the shock loading of air and electric impact wrenches -- essential for fastener removal without cracking that occurs when chrome sockets are used on impact tools.
- Ko-Ken Impact Socket Set: Black phosphate-finish impact sockets in 1/2" and 3/4" drive; chrome molybdenum steel with thicker walls than standard chrome sockets to withstand repeated impact cycling on heavy plant
- Ko-Ken Deep Socket Set: Extended reach metric sockets for fasteners with protruding studs, wheel nuts and long-thread applications; available in 1/4", 3/8" and 1/2" drive configurations
- Ko-Ken Hex Bit Socket Set: Combination bit socket set including hex, Torx and Phillips bits on 1/4" and 3/8" adapters; useful for machinery panels, access covers and mechanical assemblies using recessed fasteners
Browse Ko-Ken socket sets and ratchet wrenches at AIMS Industrial alongside our Hand Tools, Impact Tools & Accessories, and Workshop Equipment collections. Order online, Contact our team for assistance or to Request a quote.