Andrew Noyce
By Andrew Noyce

Mizuno are proud to be innovators in forging. Pushing the boundaries in the belief that the qualities of feel and greater control from a forged iron cannot be matched.

The development of Mizuno's Grain Flow Forging process that has led to the JPX850 Forged iron has taken 6 years but the breakthrough means the traditional drawback of forged irons of some sacrifice in ball speed has disappeared.

Mizuno JPX850 Forged Irons

And that is thanks to Boron. 1025 Boron to be exact and only Mizuno are using it. The introduction of Boron into the Grain Flow Forging process has allowed Mizuno to increase the strength of the forged material to give the club engineers more scope to add ball speed and distance to the JPX850 Forged iron.

Mizuno JPX850 Forged Irons

This is because Boron is 30% stronger than the traditional 1025E steel used by Mizuno and that allows for a thinner and hotter face.

Mizuno JPX850 Forged Irons

Mizuno are keen to point out that this wasn't just about a search for increased COR, as key success factors for the development team were maintaining the strength in the clubhead to allow for lie adjustability as well as safe guarding the all important soft feel of a Mizuno forged iron.

The new, hotter face in the JPX850 is complemented by a Power Frame cavity that lets the clubface flex across a wider area for faster and more consistent ball speeds.

Help is also at hand in the longer JPX850 irons from 4 through 7, with a CNC Milled pocket to increase launch angle and optimise spin.

Mizuno say the recognisable feel of their irons has been maintained with a shorter top edge to the frame that controls the vibration of the club and the JPX850 Forged irons are "harmonically tuned" to ensure the consistency of this feel throughout the set.

Mizuno JPX850 Forged Irons

Chris Voshall, Mizuno Senior Engineer, sums up the leap he feels Mizuno have made as they continue to lead the advance in golf club forging:

It took 6 years from the start of our development work with Boron Forging to get to this breakthrough point. This is distance generated by genuine technology, rather than just cranking lofts or using longer shafts. It used to be that you had to give up a little ball speed to play a Forged iron. Boron Forged gives the best of both worlds.

Mizuno JPX850 Forged Irons

More from Mizuno



Mizuno JPX850 Forged Irons - Product Details

UK Launch01 September 2014
UK Launch RRP£800
Handicap Range
GolferMens, Women
Hand AvailabilityLeft, Right
Shaft TypesSteel, Graphite
Shaft FlexLight, Ladies, Regular, Stiff
DesignCavity Back
Set Makeup4, 5, 6, 7, 8, 9, PW
Manufacturer's WebsiteMizuno Website

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