Mizuno JPX921 Hot Metal Pro Vs JPX921 Forged Review 2023

“Mizuno is a company that doesn’t play around when it comes to irons.”

“They pull out all the stops in terms of construction material and the Mizuno JPX921 Forged and Mizuno JPX921 Hot Metal irons are testaments to this dedication to premium appointments.”

One of the hallmarks of the Mizuno JPX921 series of irons is the Chromoly construction they both share. Chromoly is an extremely strong steel alloy that is made chiefly of molybdenum and chromium.

But despite both of these iron sets being made of essentially the same stuff, there are some key differences between them that you should know about. 

Mizuno JPX921 Hot Metal Vs Mizuno JPX921 Forged

“As you may have surmised, the main difference between these two iron sets is that one is forged and the other is cast.”

The names are a dead giveaway as to which is the forged set. Yes, the Mizuno JPX921 Forged irons have the classic Mizuno forged feel. The feel gets even softer as you work your way to the scoring irons. Irons 8-GW are actually forged from 1025E mild carbon steel. 

The mid and long irons are of course made from chromoly. Compared to the Mizuno JPX921 Hot Metal irons, you get a bit less offset so the Mizuno JPX921 Forged irons look a bit faster and sleeker at address. 

It’s pretty clear that the Mizuno JPX921 Forged irons were made for lower handicap players who are less concerned with consistent contact. 

The Mizuno JPX921 Hot Metal irons are cast but compensate for it with a few extra stabilizing ribs to support the cavity. This gives the Mizuno JPX921 Hot Metal irons a stabler and more solid feel. 

The Mizuno JPX921 Hot Metal irons definitely look like player’s performance irons but their features belie their appearance. For instance, the Mizuno JPX921 Hot Metals feature variable face thickness. 

In the center of the face you get a 2.2 millimeter sweet spot. Around the perimeter, the face is thinned out to 1.9 millimeters to achieve more flex. The Mizuno JPX921 Hot Metal irons also feature variable sole geometry. 

The design of the sole is intended to allow the face to flex even more – especially around the leading edge in the sole.

What They Have in Common?

Compact Design

Both irons have a sleek look that will appeal to mid and low handicap players. As you can imagine, the compact profile gives them excellent workability. 

Chromoly Construction

Chromoly is an extremely strong alloy. Using it for the face construction of the Mizuno JPX921 Hot Metal and Forged irons allowed for thinner and more explosive faces. 

Are the Mizuno JPX921 Irons Worth it?

“Yes, you’ll pay a pretty penny for either set; but if you are really ready to step up your iron game, you can hardly do better than the Mizuno JPX921 irons.”

We loved every second of testing these irons. They feel amazing and allow for superior workability around the pin. Launch for both sets is nice and controlled with a mid-low range.