Mizuno JPX 923 Hot Metal Irons Vs Hot Metal HL Vs Hot Metal Pro 2023

The latest Mizuno Hot Metal cast irons have just been released in late 2022 and they have been worth the wait.

The irons come in three versions which we will be going through in detail today along with the common features of the irons.

These irons are all about distance, stability, and consistency. The biggest change is the new 4335 Nickel Chromoly material which is 35% stronger and leads to an impressive distance gain.

The Hot Metal Irons are longer, have a higher launch, and more stopping power than the 921’s. The High Launch version is more forgiving for high handicappers with slower swing speeds. The Pro irons are for low handicappers with consistent striking who value distance.

JPX 923 Hot Metal HL

With Mizuno testing over 350,000 golfers, they found a lot of players with moderate to slower swing speeds.

They have created a club to allow these players to get the ball in the air more easily, with more distance and stopping power.

Fitted with one of over 50 custom shafts, these can be a great option for seniors and slower swing speeds who need forgiveness.

JPX 923 Hot Metal Irons

The JPX 923’s are longer than the 921’s thanks to the new material.

They also have more bounce and stronger lofts than the JPX 921 predecessors. A similar strategy was used in the Ping G430 Irons.

This equates to more distance and a higher launch, while the clubs remain stable, consistent, and relatively forgiving.

JPX 923 Hot Metal Pro Irons

Mizuno also noticed that low handicappers were playing the 921 Hot Metal because they were long, straight and relatively workable.

They have created the 923 Hot Metal Pros for this type of player.

Golfers who want the workability and precision of a player’s iron with the distance of a player’s distance iron, while still offering a high launch and good stopping power.

The HL version has the longest blade, highest offset, and thickest sole with the Hot Metal and Pro versions getting progressively smaller and more precision orientated.

JPX923 Hot Metal Irons Key Features

4335 Nickel Chromoly

As mentioned already, this material is 35% stronger than it’s predecessor in the 921 irons.

This means more speed and it allows the thinnest part of the face to be 18% larger and 8% thinner.

A bigger sweet spot gives more forgiveness and consistency.

The thinner face gives better energy transfer and more speed.


The cavity backs include a V-Chassis at the back which adds stability to the club face and reduces unwanted vibrations on any mishits.

The Chassis looks great too and we can see these irons having plenty of shelf appeal in 2023 and beyond.

They are not the most forgiving of irons in the game improvement category by any means, they do look great at address but they are also quite easy to hit well.

Less Loft More Bounce

A similar strategy to Ping, the 923 Hot Metals have less loft and more bounce than the 921 versions.

This means a high launch angle and more distance, good stopping power also workable irons.

The shorter irons are going to be progressively more workable than the longer irons too, which are more about distance and launch than working the ball.

Customized Excellence

They’re are 5 versions of these irons with the Tour and Forged versions coming out in early 2023.

There are 50 shaft combinations available so, between all of these variations, you are sure to be fitted for the perfect clubs for you.

The 923 Hot Metal irons won’t be as forgiving as some game improvement irons but if you are an improving player, these may just be perfect.


  • One Piece Nickel Chromoly Construction
  • Excellent Distance
  • Cavity Backed For Forgiveness
  • 50 Custom Shafts
  • New Slow Swing High Launch Version
  • Pro Irons Are Long And Workable
  • Better Performance Than The 921’s
  • More Shelf Appeal


  • Not The Most Forgiving
  • Too Many Options Can be Confusing
  • Sound A Little Clicky
  • Pricey

Mizuno JPX 923 Hot Metal Irons Specs, Lofts & Lie Angles

Hot Metal Irons Loft Length Offset Lie Angle
4 19° 38.5″ 0.233″ 60°
5 22° 38″ 0.22″ 60.5°
6 25° 37.5″ 0.208″ 61°
7 28.5° 37″ 0.196″ 61.5°
8 33° 36.5″ 0.18″ 62°
9 37.5° 36″ 0.159″ 62.5°
PW 42.5° 35.5″ 0.135″ 63°
GW 48° 35.25″ 0.098″ 63°
SW 54° 35.25″ 0.082″ 63°
LW 60° 35.25″ 0.065″ 63°

Hot Metal Pro Specs

Hot Metal Pro Irons Loft Length Offset Lie Angle
4 19° 38.5″ 0.155″ 60°
5 22° 38″ 0.147″ 60.5°
6 25° 37.5″ 0.139″ 61°
7 28.5° 37″ 0.131″ 61.5°
8 33° 36.5″ 0.122″ 62°
9 37.5° 36″ 0.114″ 62.5°
PW 42.5° 35.5″ 0.106″ 63°

Hot Metal High Launch Specs

Hot Metal HL Irons Loft Length Offset Lie Angle
5 25° 38″ 0.257″ 60.5°
6 28° 37.5″ 0.245″ 61°
7 31° 37″ 0.233″ 61.5°
8 35° 36.5″ 0.204″ 62°
9 40° 36″ 0.176″ 62.5°
PW 45° 35.5″ 0.147″ 63°
GW 50° 35.25″ 0.127″ 63°
SW 55° 35.25″ 0.106″ 63°

Are The Mizuno JPX 923 Worth It?

The JPX 923 irons are predominantly going to suit slower swing speeds with the HL version in particular.

The other golfer is the low handicapper looking for distance. The Pro irons are long and workable with excellent stopping power.

For a mid-handicapper looking for distance, stability, launch, and a little bit of feel around the greens, the Hot Metal irons will be ideal.

Distance: 98/100

Forgiveness: 92/100

Control: 94/100

Feel: 93/100

Overall Score: 94/100

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