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New Mizuno JPX923 irons: Everything you need to know

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What you need to know: Mizuno is launching the successor to its JPX921 series. Engineers leveraged the company’s custom-fitting program — including data from 350,000 golfers — in the creation of the JPX923 series, which includes five models: JPX923 Tour featuring a new V-Chassis and thinner topline, JPX923 Forged with features Mizuno’s third generation of chromoly forging, JPX923 Hot Metal, JPX923 Hot Metal Pro, and JPX Hot Metal HL all featuring new, faster 4335 nickel chromoly, which is 35 percent stronger than Mizuno’s original chromoly.

Mizuno JPX923 irons: What’s new, key technology

JPX923 Tour

Featuring a copper underlay for “Mizuno feel,” the JPX923 Tour is one-piece Grain Flow Forged in Hiroshima Japan from 1025E Pure Select mild carbon steel. Narrower top line and sole in tandem, more rounded trailing edge for cleaner turf interaction.  Features Mizuno’s new ‘V-Chassis’.

“The goal was to engineer a compact, players cavity back that looked and felt like a muscleback at impact. With the copper underlay and new topline, the JPX923 Tour is right there,” says David Llewellyn.

JPX923 Forged

Mizuno’s third-generation of chromoly forging places a wider milling slot heel to toe in the 4120 chromoly 4 through 7-irons as well as well as a thinner clubface. JPX923 Forged are mid-sized, full body Grain Flow Forged irons with a thinner topline and bevelled sole throughout. The scoring irons (8-GW) also feature more compact design and are forged from 1025E Pure Select mild carbon steel.

“The new JPX923 Forged pulls off two impressive achievements. First it feels more solid even though it’s faster from the face. Second, it looks sleeker with a thinner topline and narrower sole even though it plays more forgiving,” says Chris Voshall, Mizuno’s Director of Product.

JPX923 Hot Metal, Hot Metal Pro, Hot Metal HL

With the JPX923 Hot Metal, Mizuno introduces “4355 nickel chromoly,” which is 35 percent stronger than the original Hot Metal material and allows for an eight-percent thinner clubface. Cup face construction works in tandem with a deep center of gravity for high launch with stopping power.

Mizuno developed Hot Metal Pro, Hot Metal and Hot Metal HL (High Launch) from 175,000 real golf swings recorded via Mizuno’s Swing DNA system and describes the three models as follows.

  • JPX923 Hot Metal Pro is a player’s speed cavity that’s compact, with minimal offset for confident ball-strikers seeking maximum ball speed. It’s suitable for low to mid handicap golfers.
  • JPX923 Hot Metal is a forgiving speed cavity suitable for mid to high handicap golfers. It features a full speed, high stability cavity for straight flight and distance.
  • JPX923 Hot Metal HL is a high launch speed cavity delivering a higher launching option for players with moderate swing speeds or aggressive shaft lean, it’s suitable for mid to high handicap golfers.

What Mizuno says

“The new JPX923 series was planned out with Mizuno’s custom ethos at its core” says David Llewellyn, Director of R&D for Mizuno. “We already offer more than 50 unique shafts within our custom program, by expanding to five iron models, there’s an ideal combination for every type of player.”

“We’re constantly evolving the JPX series based on more than 175,000 unique swings we capture every year on the Mizuno Shaft Optimizer,” says Bill Price, Mizuno’s Director of Fitting. “Recently we’re seeing an increase in the number of players with slightly slower swing speeds being fitted – and a trend to more shaft lean. Hence a slight increase in bounce angles through all the models and the introduction of the Hot Metal High Launch.”

Resident Club Junkie Brian Knudson’s take

Note: GolfWRX has not yet gotten an in-hand look at the JPX923 Tour or Forged irons. 

Mizuno’s Hot Metal HL irons look easy to hit and high flying with their larger sole and longer heel to toe shape. You can see some of the tech that is packed into these irons around the badge like the Harmonic Impact ribs and the Stability Frame. Like you would expect from Mizuno the finish quality and badging all look very good and catch your eye without the need for wild colors.

The Mizuno Hot Metal irons look to be the bread and butter of the lineup. The Hot Metal features a little smaller footprint than the HL, less offset, thinner top line, and narrower sole. The look from address will please most golfers and it is still packed with the technology for easy distance and effortless launch.

Hot Metal Pro irons are the smallest of the three but should still offer a great combination of looks and performance. They are still a little longer from heel to toe while offering the least offset and thinnest toppling of the group. The short irons are shaped really well and the whole set flows great from 4 iron down to the pitching wedge.

What they look like

JPX923 Hot Metal Pro

Mizuno JPX923 Hot Metal

JPX923 Hot Metal HL

Pricing and availability

JPX923 Hot Metal Pro: 4-PW RH and LH
JPX923 Hot Metal: 4-LW RH and LH
JPX923 Hot Metal HL: 5-SW RH only

Tour, Forged will hit retail in February of 2023. Hot Metal models at retail late September.

  • JPX923 Tour/Forged – $187.50 per club
  • JPX923 Hot Metal/Hot Metal Pro/Hot Metal High Launch – $137.50 per club

Loft comparisons to JPX921

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7 Comments

7 Comments

  1. Pingback: Best irons in golf of 2023: Easiest to launch – GolfWRX

  2. Jub

    Sep 24, 2022 at 9:35 am

    Mizuno has a sh$t ton of irons out

  3. Ben Hoagie

    Sep 23, 2022 at 12:14 pm

    Currently playing forged 921’s 6-pw. If I were to get the 923 version, I’d get 5i, 7-9i; weaken lofts 1* on the 5, 8, & 9. Throw in 46 and 52 Ping Glide 4.0 and 58 TM hi toe.

  4. DD

    Sep 23, 2022 at 11:06 am

    The lofts on the Forged are just silly now. 3-degree gaps in long irons and 5-degree gaps in scoring irons. Makes no sense for that level of player. I wouldn’t even consider full set of the Forged.

    At least you can still go forged with the 4i or 4i+5i and then go Tours for the rest of the set. Gets you 4-degree gaps throughout.

    • Brian

      Sep 24, 2022 at 3:08 pm

      Other than the 6 to 7, it’s pretty much the same gapping going all the way back to the 850 Forged.

  5. Skip

    Sep 23, 2022 at 9:58 am

    42.5 degree PW WTF lol

    • Bob

      Sep 24, 2022 at 7:03 pm

      But your buddies are jealous how far you hit the wedge now and will run out to buy the same irons as you.

      Everything is a lie or a scam now.

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Whats in the Bag

Chesson Hadley WITB 2024 (March)

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Driver: Titleist TSR3 (10 degrees, D1 SureFit setting)
Shaft: Mitsubishi Diamana D+ 70 TX

3-wood: Titleist TSR2+ (14.5 degrees, A1 SureFit setting)
Shaft: Mitsubishi Diamana D+ 80 TX

Irons: Titleist T200 (3), Titleist 620 CB (4, 5), Titleist 620 MB (6-PW)
Shafts: Graphite Design Tour AD DI 105 X (3), True Temper Dynamic Gold Tour Issue X100 (4-PW)

Wedges: Titleist Vokey Design SM10 (52-12F, 56-14F), WedgeWorks (60-K)
Shafts: True Temper Dynamic Gold Tour Issue S400

Putter: Odyssey White Hot OG 2-Ball
Grip: Odyssey

Grips: Golf Pride Tour Velvet

Ball: Titleist Pro V1x

Check out more in-hand photos Chesson Hadley’s clubs here.

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Whats in the Bag

Gary Woodland WITB 2024 (March)

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Driver: Cobra Darkspeed X (8 degrees)
Shaft: Accra TZ5 70 M5

  • The white circle that appears at the top of the face a removable sticker that’s used for launch monitor tracking, and Woodland removes it for competition!

3-wood: Cobra Darkspeed X (14 degrees)
Shaft: Accra TZ5 GW100 Prototype

7-wood: Cobra LTDx LS prototype (20 degrees)
Shaft: Accra TZ5 GW100 Prototype

Irons: Wilson Staff (18 degrees), Cobra King MB (4-PW)
Shafts: KBS Tour C-Taper Limited X

Wedges: Cobra SB (48), Titleist Vokey Design SM10 (52-08F, 56-14F), Cobra King (60)
Shafts: KBS Tour C-Taper Limited X (48 degrees), KBS Tour V-Ten 125

Putter: Scotty Cameron T-5 Proto
Grip: SuperStroke Zenergy Tour 3.0P

Ball: Titleist Pro V1x

Grips: Golf Pride Tour Velvet Cord

See more in-hand photos of Gary Woodland’s WITB in the forums.

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Equipment

Q&A: Martin Trainer on his Bobby Grace “Greg Chalmers” putter, 6.5-degree driver, and “butter knife” 2-iron

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As unbiasedly as I can put it, Martin Trainer has one of the coolest club setups in professional golf. (At some point soon, I’ll put together a top-10 list of “coolest club setups on Tour,” but I know that Trainer will be in the top-10)

What a lineup. He plays a 6.5-degree Wilson prototype driver, a 13-degree Wilson prototype 3-wood, a true blade Wilson Staff Model 2-iron, and a Bobby Grace “Greg Chalmers Commemorative” putter!

 

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A post shared by GolfWRX (@golfwrx)

I mean, look at this 2-iron from address…

To quote the great author R.L. Stine: “Goosebumps.”

On Wednesday at the 2024 Texas Children’s Houston Open, I caught up with Trainer to learn more about his bag setup.

Here’s what he had to say:

You have the Internet going crazy over your bag setup, and your putter. Where’d you pick the Bobby Grace-Greg Chalmers putter up? How long have you had it?

MT: This was from when Bobby Grace came to my course in California: Cal Club. And for whatever reason, they just started having them in the shop. So then I took my buddy’s, started using it, and made, like, a million putts in a row, which is how every putter story begins, I guess.

And then, I bought a couple of my own, used it for years, got to the Tour with it, won on Tour with it (the 2019 Puerto Rico Open). Then, about a year later, started using another putter, did that for a couple years, but now it’s back in the bag.

When did it come back in the bag?

MT: December of this past year. So a few months ago.

What year would you say was the first time you threw that in the bag, or, like, when you bought it?

MT: God…Probably, 2016, maybe? 2018?

Do you remember how much you paid for it?

MT: I don’t know, actually. Maybe $100-150 bucks or something. I think that’s the only golf club I’ve bought between high school and now. Well, two, since I bought two of them.

The driver is interesting, too. What went into the prototyping process?

MT: That was a version of the current driver, but it was the prototype that they first came out with for Tour guys to try. And for whatever reason, I just never switched out to the new one.

It’s just 6.5 degrees, right?

MT: Yeah. Very low loft, yeah.

What kind of ball speed do you have with that these days?

MT: Like high 170’s.

Yeah, that’ll work. And then a 2-iron blade? We’re seeing fewer and fewer of those out here.

MT: Yeah. The butter knife.

Very cool thing to have in the bag. Have you done any testing with driving irons? 

MT: Yeah, I used to have a thicker one, but it was a little offset, and I never hit it that well. And then finally, I started messing around with the butter knife. And I remember the first time I looked down at it, I was terrified. And then I ended up getting used to it, putting it in play, and it’s been in place since. It’s a pretty good club for me.

How far do you carry that? 

MT: Like 235.

A good little wind club, I’m sure.

MTL Yeah, exactly. I can hit it very low. It’s great.

I love it. You have people shook looking at that. Thanks for the time, man. 

MT: Absolutely.

To see more photos and discussion of Trainer’s bag, click here.

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