Search  for anything...
Ko-ken

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

  • Based on 170 reviews
Condition: New
Checking for the best price...
$70.00 Why this price?
Save $5.98 was $75.98

Buy Now, Pay Later

As low as $11.67 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 8 left in stock, order soon!
Fulfilled by Amazon
Arrives Friday, May 15
Order within 14 hours and 21 seconds
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

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 Grams


Head Style: Fixed Ratchet


Operation Mode: Mechanical


Measurement Standard: Metric


Brand Name: Ko-ken


Model Number: 3725Z


Manufacturer: 山下工業研究所


Manufacturer Part Number: 3725Z


Item Type Name: Ratchet Handle


Unit Count: 1.0 Count


Included Components: No


Item Length: 17.8 Centimeters


Item Weight: 250 Grams


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: Friday, May 15

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Quality Japanese tool
Pattern Name: Single Item
Great ratchet. Love working on Japanese bikes with Japanese tools. Feels very good in your hand. Very little back drag
Reviewed in the United States on March 3, 2026 by Josh Perkins
    • 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
    • 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
    • Great ratchet
Pattern Name: Single Item
Excellent ratchet with little back drag and smooth action. Will buy more
Reviewed in the United States on April 18, 2026 by Adam Peterson
    • 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
    • YouTube it 1st, You won’t regret buying it.
Pattern Name: Single Item
This is an excellent ratchet. The size and feel is amazing. It’s soo smooth and holds sockets perfectly.
Reviewed in the United States on March 13, 2026 by Zim Guy
    • Second best tool I've ever held!
Pattern Name: Single Item
Who am I kidding, this is easily the best quality hand tool I've ever held. The heft and finish are perfect... the natural fit in you hand. 72 teeth get the job done with only a few degrees of movement. This Japanese tool will win you over.
Reviewed in the United States on March 8, 2026 by Craig
    • Dumb rotor head mechanic
Pattern Name: Single Item
Is great ratchet. 10/10 back drag is the best currently available on the market. Head is good and small. Handle grip is surprisingly nice, not usually a fan of bigger grips. Selector switch isn't a rigid little bastard. Glad I bought it, works wonders on helicopters.
Reviewed in the United States on January 11, 2026 by JD

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...