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Ko-ken

Koken Z-EAL 3/8 (9.5 mm) SQ. Ratchet Handle, Total Length: 7.0 inches (178 mm) 3725Z

  • Based on 569 reviews
Condition: New
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Availability: Only 1 left in stock, order soon!
Fulfilled by Amazon
Arrives Monday, Aug 31
Order within 12 hours and 3 minutes
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Features

  • Size D: 1.1 inches (28 mm)
  • Weight: 8.8 oz (254 g)
  • Size T: 0.9 inches (24.5 mm)
  • Size L: 7.0 inches (178 mm)
  • Size H: 0.5 inches (13.7 mm)
  • By pursuing the precision of each part, it achieves an excellent experience. Adopts 36-tooth gear and an easy-to-grip resin grip

Description

Ko-ken ratchets are renowned for their precision engineering, delivering exceptionally low backlash, compact head sizes, and high torque performance. The newly designed 72 tooth ratchet continues this legacy, combining our hallmark features with refined advancements. Featuring a patented dual pawl mechanism with a single spring, this ratchet provides a smooth 5° arc swing, allowing for superior control in tight spaces. The innovative design increases surface area contact within the gear, resulting in a 10% higher torque limit while preserving Ko-ken’s signature low-torque backlash performance.

Color: Black/Silver


Brand: Ko-ken


Material: Metal


Item Length: 17.8 centimeters


Item Weight: 250 g


Head Style: Fixed Ratchet


Operation Mode: Mechanical


Measurement Standard: Metric


Brand Name: Ko-ken


Model Number: 3725Z


Unit Count: 1 Count


Number of Items: 1


Manufacturer: 山下工業研究所


Included Components: No


Item Type Name: Ratchet Handle


Manufacturer Part Number: 3725Z


Manufacturer Warranty Description: Lifetime warranty does not cover abuse


Item Length: 17.8 centimeters


Item Weight: 250 g


Package Quantity: 1


Material Type: Metal


Finish Types: Polished


Color: Black/Silver


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Aug 31

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Great rachet. Smoothest back drag. Comfortable to use.
Pattern Name: Single Item
Great rachet. One of the smoothest rachets i own. Super low back drag. Its my go to rachet for almost anything.
Reviewed in the United States on April 21, 2026 by Exrc03
    • Nice!
Pattern Name: Single Item
This is, arguably the nicest 3/8 ratchet that I have ever owned. It's got the absolute smoothest rotation I've ever seen. No play in the anvil gear and, no backdrag, seriously. The direction switch is very easy to change directions with a lighter spring incorporated into it. That's usually something I don't like because it can make the switch jump while it's turning, but it hasn't been an issue with this one. It has the nicest polished chrome finish of any ratchet I've seen as well. This is a short ratchet at about 6.5- 7 inches or so. The mechanism is exposed on the back of the ratchet to give it more stability under load, and it allows you to bring on out a loose bolt by holding a finger or thumb on the back to prevent the bolt from turning back in on you when you turn it back the other way. It's not a sealed head, but it's very easy to take apart for cleaning and oil. Using grease will cause it to skip because the spring pressure is so light. But this ratchet is very strong. It has a need for Japanese tools for me. Get one. ... show more
Reviewed in the United States on August 21, 2024 by Shannon V
    • Pretty nice.
Pattern Name: Single Item
Review Image by maddog
Review Image by maddog
Review Image by maddog
Review Image by maddog
Best ratchet ever? I prefer some other brands but this ratchet is nice. Dual 80 Snap-ons are tanks but back drag isn’t their selling point. They are the best IMO though. Koken Z back drag is the selling point. Better than any ratchet I have except for maybe a $nap-on Zero 💸 and some other Ko-ken Z ratchets. 90 tooth USA S-K’s are in that ball park too. Japanese Nepros 90 tooth 3/8” ratchets are close in light back drag as well and also very nicely finished. KTC Nepros have the same reverse positions as western ratchets unlike Ko-ken which is opposite . ———————————————— Pictures are with Snap-on dual 80 and Nepros 90 for comparison. ________________________________ Have several Ko-ken ratchets now. Didn’t need them but rave reviews made me curious enough to purchase. Very nice for ratchets in $45-$75 range. The ratchets I think are better were a lot more then what I paid for my Ko-ken ratchets. The hype about Ko-ken ratchets back drag is true. But. IMO I have better 3/8” ratchets all though maybe not as light in back drag. Ko-ken isn’t the be all end all in ratchets for me as for some reviewers. But they are very nice. Affordable without compromising overall quality. I liked the first one I bought enough that I purchased more from Amazon Japan. So 👍 ... show more
Reviewed in the United States on January 13, 2026 by maddog
    • Hard To Beat Japanese Quality - I'm Now A Koken Fan
Pattern Name: Single Item
I'm a home gamer shade tree mechanic, but I feel like a pro when using this Koken ratchet. It has a very smooth operation and very low back drag so it'll spin sockets in the desired direction when the fastener isn't offering much resistance, instead of annoyingly spinning in both directions, requiring the mechanic to add some friction with the off hand to prevent spinning backward on the return stroke. The direction selector tab may work the opposite of your other ratchets. That could really bug some people, and would probably bother me if I used ratchets so often that I could remember which way they rotate without checking each time. When the little lever is rotated clockwise (to the left), this Koken ratchet turns sockets counterclockwise. This ratchet was my gateway drug to Koken. I bought a couple of other Koken tools since then and plan on buying more. Not quite as addictive as Milwaukee power tools, but close. Koken makes high quality, clever, often best-in-class tools. ... show more
Reviewed in the United States on January 2, 2026 by Liberty4Ever
    • Japanese quality
Pattern Name: Single Item
Compact and excellent finish work. Used almost daily in commercial maintenance applications and fits great in my tool bag.
Reviewed in the United States on June 7, 2026 by Nick
    • good low back drag rachet
Pattern Name: Single Item
mechanic. Have many different brands of rachets and my most used are snap on and matco. This does have its uses but is it as good as the tool trucks I would have to say no. Yes its slightly cheaper but lack of warranty at this price range is a hard pill to swallow. I use in situations the low back drag is beneficial but other than that it doesn't come out very often. I think it would be great for someone who just wrenches on their own vehicles but for me it is too easy to change direction and lacks the strength I need, and while it does feel good compared to cheap rachets, it doesn't have the solid feel that im used to feeling, that might be a personal preference. I dont regret buying as I said it does come in handy in certain situations. Is it the best rachet ever as others have stated? No. Is it a very nice rachet, with unique characteristics that sometimes are extremely beneficial? Yes ... show more
Reviewed in the United States on July 25, 2026 by Trick Danny K
    • Smooth!
Pattern Name: Single Item
Very little backdrag, seemed a little rough when i first got it. Opened it up and added a drop of light oil. Now it has less backdrag then all my snapon and gearwrench ratchets
Reviewed in the United States on June 23, 2026 by kyle campbell
    • Best ratchet I have used
Pattern Name: Single Item
I have quite a few ratchets on my box, and this is the one I grab for every small job. It has a shorter handle so it’s not great for getting lots of torque but the mechanism is super smooth and the backlash is less than anything I have. Koken makes some very high quality tool and you can feel it.
Reviewed in the United States on January 15, 2026 by Amazon Customer

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