Amazon has the Koken 8-19mm RS3400MZ/8 socket set (8-pc, 6-pt, short) for $43.28. Koken USA sells it for $90.
Koken Socket Set
Koken Socket Set
Koken Z-series 3/8" Drive 8-pc Socket Set $44
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mattstevens
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- Jun 3, 2023
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- 43
Looks like the 12 piece is also available for $52.65 via Amazon Japan under other sellers.
Qualitytools
Well-known member
I have the 3/8 12PC set and Love it!
kngelv
Well-known member
You will like them. I have the regular and nut grip. They are very nice but these are their top of the line.
MidnightZ21
Well-known member
Anyone have a link to the 12 piece deal? I can’t find it
moto_ridah
Well-known member
In for a 12pc set as well. Thanks
LWB
Well-known member
Thanks, got the last set on Amazon.ca for 93 CDN
moto_ridah
Well-known member
In the product page from OP link click on "Pack of 12" rather than "8 pack". Amazon Japan is under Other Sellers.
cweidert03
Well-known member
Hoping Amazon gets the 8 piece canceled! I ordered the 12 piece after it was posted..
Jarhead0408
Well-known member
I snagged a 12 piece as well. Thanks to you and the OP as well.
Interesting that Amazon was trying to hide this deal a little bit. Why doesn't it appear when you first click on "pack of 12" ? Instead, you see a price of $78. Also odd that it doesn't seem possible to post a direct link to the $52.65 deal.
It looks like the 12pc set is now on backorder for4-6 weeks.
Last edited:
cweidert03
Well-known member
I have both the 8pc and 12 pc coming. Guess I’ll have to sell the 8pc as Amazon wouldn’t cancel it
Can’t you just return it to Amazon?
Jeff
Well-known member
Thanks, you beautiful *******!
Jeff
Well-known member
Koken RS2300X/12 1/4" (6.35 mm) SQ. Hex Semi-Deep Socket Rail Set, 12 Pieces $57.78 - Amazon Japan
cweidert03
Well-known member
8pc set showed up last night
LWB
Well-known member
Mine came and i was hoping they would fit more of my ratchets than they did. I was really hoping they would fit my Snappy ratchet. They didn't so they went back. Nice sockets and rail though.
LWB
Well-known member
The ball on the anvil didn't reach the detent on the socket. The Z series are a new patented design. I knew it could potentially be a problem but didn't realize how many they wouldn't seat on.
FWIW it they fit sung as a bug on my Astro wrench.
moto_ridah
Well-known member
My 12pc set came in today, was a bit concerned about the above fitment issues but feel a bit better now. Rounded up most of the accessible ratchets in the garage for a fitting. I arranged them from least (bottom) to most (top) clearance. The only one that was really an issue is the Williams B52 on the bottom, the socket base was touch the ratchet head. The KTC swivel head technically bottomed the socket but the whole anvil base turns so I'm ok with it. The Snappy FL721 had just a sliver of light under the socket. I could see how som newer Snap Ones could have issues pending the drive design. Sockets seated on all of the ratchets and had very strong retention.
kngelv
Well-known member
My 12 piece set showed up yesterday. I was very impressed by the packaging from Amazon Japan. This is my first set of Koken sockets but certainly will not be my last. The broaching and finish are top notch and I'm very impressed with the socket rail. There is a very satisfying click when removing and seating the sockets plus I like that the magnetic rail has felt backing so as not to mar the finish of anything the rail is mounted on. The attention to detail by Koken is noted and appreciated.
James
James
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cbracer
Well-known member
I had a similar fit issue on my Z-series 1/4" hex and torx bit sockets.... using a Ko-ken ratchet none the less! Some companies have a lot of variance in their detent such as Proto, and others like the older USA made Craftsman sockets I had didn't have any variance. Sometimes the same socket will have some when you turn it 90 degrees the detent will be different. Here is the email I sent off to Ko-ken and have not seen a reply yet from Ko-ken Japan:
I went back through testing the fit on all of my 1/4" drive Z-series stuff and I would conclude the issue is based on "tolerance" of the detent cut depth & location placement. The best correction would be to fix the detent cut location. See attached picture. Both of these sockets are a Ko-ken 1/4" Z-series. On the left is the newer hex bit socket, and on the right is an older deep socket, both Z-series. You can clearly see the detent is less deep on the newer bit socket, which causes the width and height to be less. The height of it in this picture is the important part. The start of the detent angle is too low into the square drive - and this is why I am not feeling any detent engagement. Here are some notes:
-The bottom image shows half of the deep socket detent moved over to compare exactly with the newer bit socket.
-The detent is clearly deeper cut on the right than the left. See the blue lines.
-The vertical purple arrow is the distance to the start of the detent which is too long on the left socket. The green lines point to the top of the detent cut which is too far on the left for the ball to engage the detent.
-You can see where the ball rests on the deep socket (right side) by the dark round spot.
-On both sockets you can see the dark vertical line where the ball rolls up and down. On the left socket the line is longer! This is the problem.
Ko-ken should fix the location of the detent to be higher, and /or a deeper cut like the older long socket. Then any tolerances would not create a problem.
I went back through testing the fit on all of my 1/4" drive Z-series stuff and I would conclude the issue is based on "tolerance" of the detent cut depth & location placement. The best correction would be to fix the detent cut location. See attached picture. Both of these sockets are a Ko-ken 1/4" Z-series. On the left is the newer hex bit socket, and on the right is an older deep socket, both Z-series. You can clearly see the detent is less deep on the newer bit socket, which causes the width and height to be less. The height of it in this picture is the important part. The start of the detent angle is too low into the square drive - and this is why I am not feeling any detent engagement. Here are some notes:
-The bottom image shows half of the deep socket detent moved over to compare exactly with the newer bit socket.
-The detent is clearly deeper cut on the right than the left. See the blue lines.
-The vertical purple arrow is the distance to the start of the detent which is too long on the left socket. The green lines point to the top of the detent cut which is too far on the left for the ball to engage the detent.
-You can see where the ball rests on the deep socket (right side) by the dark round spot.
-On both sockets you can see the dark vertical line where the ball rolls up and down. On the left socket the line is longer! This is the problem.
Ko-ken should fix the location of the detent to be higher, and /or a deeper cut like the older long socket. Then any tolerances would not create a problem.
They are sweet. My proto sockets fit my ko-ken ratchet very good but they are o ly a few years old.
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Jeff
Well-known member
Received my 3/8" metric set today. Excellent fit & finish.
For fitment I used all my 3/8" ratchets; Tone TRH31, Wera, Tone MRH30S, and Koken 2749PS. For shits and grins I added a SK wobble extension. No issues.
For fitment I used all my 3/8" ratchets; Tone TRH31, Wera, Tone MRH30S, and Koken 2749PS. For shits and grins I added a SK wobble extension. No issues.
12ptSocketsAreDumb
Active member
- Joined
- Sep 1, 2021
- Messages
- 31
I bought a set, I wish the deep sockets and impact sockets were as well discounted as these. I can't complain though. I may also grab the 1/4 ones at $52.